From patchwork Thu Jun 24 18:23:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 44001 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id D4C3439B0417 for ; Thu, 24 Jun 2021 18:24:41 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D4C3439B0417 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624559081; bh=ReJD1Zm0aQOnkJKPj1rNAlMG4N/qBJ8sWL7D8m19Ga8=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=RW9sX0TQuf6QI4I9lwHEzMZKYNdF3NDYWQyHOyW3em4zjcIWqhPuUC/1r2RciJW// Zdg+EfB0kg/a4KsH+G1CBJ3ZmTnEMv8tOBwdD2jqLOyePKSTYYAusOH+eXb/memL8t eY6ILDmJsxB5G9mgqkdCA7vRikYasolBJMVtFq4s= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from fossa.birch.relay.mailchannels.net (fossa.birch.relay.mailchannels.net [23.83.209.62]) by sourceware.org (Postfix) with ESMTPS id B54A339AD07E for ; Thu, 24 Jun 2021 18:23:39 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org B54A339AD07E X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id 03F53922A4A; Thu, 24 Jun 2021 18:23:38 +0000 (UTC) Received: from pdx1-sub0-mail-a66.g.dreamhost.com (100-96-17-75.trex.outbound.svc.cluster.local [100.96.17.75]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id 6779E922A7B; Thu, 24 Jun 2021 18:23:37 +0000 (UTC) X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from pdx1-sub0-mail-a66.g.dreamhost.com (pop.dreamhost.com [64.90.62.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384) by 100.96.17.75 (trex/6.3.3); Thu, 24 Jun 2021 18:23:38 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|siddhesh@gotplt.org X-MailChannels-Auth-Id: dreamhost X-Irritate-Language: 4e43bfcf458a45c6_1624559017843_1067550687 X-MC-Loop-Signature: 1624559017843:118520082 X-MC-Ingress-Time: 1624559017842 Received: from pdx1-sub0-mail-a66.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTP id A56FA8DD5C; Thu, 24 Jun 2021 11:23:35 -0700 (PDT) Received: from rhbox.intra.reserved-bit.com (unknown [1.186.101.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTPSA id 0E6EF8CE56; Thu, 24 Jun 2021 11:23:31 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a66 To: libc-alpha@sourceware.org Subject: [PATCH 1/8] Move glibc.malloc.check implementation into its own file Date: Thu, 24 Jun 2021 23:53:05 +0530 Message-Id: <20210624182312.236596-2-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624182312.236596-1-siddhesh@sourceware.org> References: <20210624182312.236596-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-3494.6 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NEUTRAL, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Separate the malloc check implementation from the malloc hooks. They still use the hooks but are now maintained in a separate file. --- malloc/hooks.c | 371 +--------------------------------------- malloc/malloc-check.c | 390 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 391 insertions(+), 370 deletions(-) create mode 100644 malloc/malloc-check.c diff --git a/malloc/hooks.c b/malloc/hooks.c index 8080c3f40e..57a9b55788 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -49,376 +49,7 @@ memalign_hook_ini (size_t alignment, size_t sz, const void *caller) return __libc_memalign (alignment, sz); } -/* Whether we are using malloc checking. */ -static int using_malloc_checking; - -/* Activate a standard set of debugging hooks. */ -void -__malloc_check_init (void) -{ - using_malloc_checking = 1; - __malloc_hook = malloc_check; - __free_hook = free_check; - __realloc_hook = realloc_check; - __memalign_hook = memalign_check; -} - -/* When memory is tagged, the checking data is stored in the user part - of the chunk. We can't rely on the user not having modified the - tags, so fetch the tag at each location before dereferencing - it. */ -#define SAFE_CHAR_OFFSET(p,offset) \ - ((unsigned char *) tag_at (((unsigned char *) p) + offset)) - -/* A simple, standard set of debugging hooks. Overhead is `only' one - byte per chunk; still this will catch most cases of double frees or - overruns. The goal here is to avoid obscure crashes due to invalid - usage, unlike in the MALLOC_DEBUG code. */ - -static unsigned char -magicbyte (const void *p) -{ - unsigned char magic; - - magic = (((uintptr_t) p >> 3) ^ ((uintptr_t) p >> 11)) & 0xFF; - /* Do not return 1. See the comment in mem2mem_check(). */ - if (magic == 1) - ++magic; - return magic; -} - -/* Visualize the chunk as being partitioned into blocks of 255 bytes from the - highest address of the chunk, downwards. The end of each block tells - us the size of that block, up to the actual size of the requested - memory. Our magic byte is right at the end of the requested size, so we - must reach it with this iteration, otherwise we have witnessed a memory - corruption. */ -static size_t -malloc_check_get_size (mchunkptr p) -{ - size_t size; - unsigned char c; - unsigned char magic = magicbyte (p); - - assert (using_malloc_checking == 1); - - for (size = CHUNK_HDR_SZ + memsize (p) - 1; - (c = *SAFE_CHAR_OFFSET (p, size)) != magic; - size -= c) - { - if (c <= 0 || size < (c + CHUNK_HDR_SZ)) - malloc_printerr ("malloc_check_get_size: memory corruption"); - } - - /* chunk2mem size. */ - return size - CHUNK_HDR_SZ; -} - -/* Instrument a chunk with overrun detector byte(s) and convert it - into a user pointer with requested size req_sz. */ - -static void * -mem2mem_check (void *ptr, size_t req_sz) -{ - mchunkptr p; - unsigned char *m_ptr = ptr; - size_t max_sz, block_sz, i; - unsigned char magic; - - if (!ptr) - return ptr; - - p = mem2chunk (ptr); - magic = magicbyte (p); - max_sz = memsize (p); - - for (i = max_sz - 1; i > req_sz; i -= block_sz) - { - block_sz = MIN (i - req_sz, 0xff); - /* Don't allow the magic byte to appear in the chain of length bytes. - For the following to work, magicbyte cannot return 0x01. */ - if (block_sz == magic) - --block_sz; - - *SAFE_CHAR_OFFSET (m_ptr, i) = block_sz; - } - *SAFE_CHAR_OFFSET (m_ptr, req_sz) = magic; - return (void *) m_ptr; -} - -/* Convert a pointer to be free()d or realloc()ed to a valid chunk - pointer. If the provided pointer is not valid, return NULL. */ - -static mchunkptr -mem2chunk_check (void *mem, unsigned char **magic_p) -{ - mchunkptr p; - INTERNAL_SIZE_T sz, c; - unsigned char magic; - - if (!aligned_OK (mem)) - return NULL; - - p = mem2chunk (mem); - sz = chunksize (p); - magic = magicbyte (p); - if (!chunk_is_mmapped (p)) - { - /* Must be a chunk in conventional heap memory. */ - int contig = contiguous (&main_arena); - if ((contig && - ((char *) p < mp_.sbrk_base || - ((char *) p + sz) >= (mp_.sbrk_base + main_arena.system_mem))) || - sz < MINSIZE || sz & MALLOC_ALIGN_MASK || !inuse (p) || - (!prev_inuse (p) && ((prev_size (p) & MALLOC_ALIGN_MASK) != 0 || - (contig && (char *) prev_chunk (p) < mp_.sbrk_base) || - next_chunk (prev_chunk (p)) != p))) - return NULL; - - for (sz = CHUNK_HDR_SZ + memsize (p) - 1; - (c = *SAFE_CHAR_OFFSET (p, sz)) != magic; - sz -= c) - { - if (c == 0 || sz < (c + CHUNK_HDR_SZ)) - return NULL; - } - } - else - { - unsigned long offset, page_mask = GLRO (dl_pagesize) - 1; - - /* mmap()ed chunks have MALLOC_ALIGNMENT or higher power-of-two - alignment relative to the beginning of a page. Check this - first. */ - offset = (unsigned long) mem & page_mask; - if ((offset != MALLOC_ALIGNMENT && offset != 0 && offset != 0x10 && - offset != 0x20 && offset != 0x40 && offset != 0x80 && offset != 0x100 && - offset != 0x200 && offset != 0x400 && offset != 0x800 && offset != 0x1000 && - offset < 0x2000) || - !chunk_is_mmapped (p) || prev_inuse (p) || - ((((unsigned long) p - prev_size (p)) & page_mask) != 0) || - ((prev_size (p) + sz) & page_mask) != 0) - return NULL; - - for (sz = CHUNK_HDR_SZ + memsize (p) - 1; - (c = *SAFE_CHAR_OFFSET (p, sz)) != magic; - sz -= c) - { - if (c == 0 || sz < (c + CHUNK_HDR_SZ)) - return NULL; - } - } - - unsigned char* safe_p = SAFE_CHAR_OFFSET (p, sz); - *safe_p ^= 0xFF; - if (magic_p) - *magic_p = safe_p; - return p; -} - -/* Check for corruption of the top chunk. */ -static void -top_check (void) -{ - mchunkptr t = top (&main_arena); - - if (t == initial_top (&main_arena) || - (!chunk_is_mmapped (t) && - chunksize (t) >= MINSIZE && - prev_inuse (t) && - (!contiguous (&main_arena) || - (char *) t + chunksize (t) == mp_.sbrk_base + main_arena.system_mem))) - return; - - malloc_printerr ("malloc: top chunk is corrupt"); -} - -static void * -malloc_check (size_t sz, const void *caller) -{ - void *victim; - size_t nb; - - if (__builtin_add_overflow (sz, 1, &nb)) - { - __set_errno (ENOMEM); - return NULL; - } - - __libc_lock_lock (main_arena.mutex); - top_check (); - victim = _int_malloc (&main_arena, nb); - __libc_lock_unlock (main_arena.mutex); - return mem2mem_check (tag_new_usable (victim), sz); -} - -static void -free_check (void *mem, const void *caller) -{ - mchunkptr p; - - if (!mem) - return; - - int err = errno; - - /* Quickly check that the freed pointer matches the tag for the memory. - This gives a useful double-free detection. */ - if (__glibc_unlikely (mtag_enabled)) - *(volatile char *)mem; - - __libc_lock_lock (main_arena.mutex); - p = mem2chunk_check (mem, NULL); - if (!p) - malloc_printerr ("free(): invalid pointer"); - if (chunk_is_mmapped (p)) - { - __libc_lock_unlock (main_arena.mutex); - munmap_chunk (p); - } - else - { - /* Mark the chunk as belonging to the library again. */ - (void)tag_region (chunk2mem (p), memsize (p)); - _int_free (&main_arena, p, 1); - __libc_lock_unlock (main_arena.mutex); - } - __set_errno (err); -} - -static void * -realloc_check (void *oldmem, size_t bytes, const void *caller) -{ - INTERNAL_SIZE_T chnb; - void *newmem = 0; - unsigned char *magic_p; - size_t rb; - - if (__builtin_add_overflow (bytes, 1, &rb)) - { - __set_errno (ENOMEM); - return NULL; - } - if (oldmem == 0) - return malloc_check (bytes, NULL); - - if (bytes == 0) - { - free_check (oldmem, NULL); - return NULL; - } - - /* Quickly check that the freed pointer matches the tag for the memory. - This gives a useful double-free detection. */ - if (__glibc_unlikely (mtag_enabled)) - *(volatile char *)oldmem; - - __libc_lock_lock (main_arena.mutex); - const mchunkptr oldp = mem2chunk_check (oldmem, &magic_p); - __libc_lock_unlock (main_arena.mutex); - if (!oldp) - malloc_printerr ("realloc(): invalid pointer"); - const INTERNAL_SIZE_T oldsize = chunksize (oldp); - - if (!checked_request2size (rb, &chnb)) - { - __set_errno (ENOMEM); - goto invert; - } - - __libc_lock_lock (main_arena.mutex); - - if (chunk_is_mmapped (oldp)) - { -#if HAVE_MREMAP - mchunkptr newp = mremap_chunk (oldp, chnb); - if (newp) - newmem = chunk2mem_tag (newp); - else -#endif - { - /* Note the extra SIZE_SZ overhead. */ - if (oldsize - SIZE_SZ >= chnb) - newmem = oldmem; /* do nothing */ - else - { - /* Must alloc, copy, free. */ - top_check (); - newmem = _int_malloc (&main_arena, rb); - if (newmem) - { - memcpy (newmem, oldmem, oldsize - CHUNK_HDR_SZ); - munmap_chunk (oldp); - } - } - } - } - else - { - top_check (); - newmem = _int_realloc (&main_arena, oldp, oldsize, chnb); - } - - DIAG_PUSH_NEEDS_COMMENT; -#if __GNUC_PREREQ (7, 0) - /* GCC 7 warns about magic_p may be used uninitialized. But we never - reach here if magic_p is uninitialized. */ - DIAG_IGNORE_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); -#endif - /* mem2chunk_check changed the magic byte in the old chunk. - If newmem is NULL, then the old chunk will still be used though, - so we need to invert that change here. */ -invert: - if (newmem == NULL) - *magic_p ^= 0xFF; - DIAG_POP_NEEDS_COMMENT; - - __libc_lock_unlock (main_arena.mutex); - - return mem2mem_check (tag_new_usable (newmem), bytes); -} - -static void * -memalign_check (size_t alignment, size_t bytes, const void *caller) -{ - void *mem; - - if (alignment <= MALLOC_ALIGNMENT) - return malloc_check (bytes, NULL); - - if (alignment < MINSIZE) - alignment = MINSIZE; - - /* If the alignment is greater than SIZE_MAX / 2 + 1 it cannot be a - power of 2 and will cause overflow in the check below. */ - if (alignment > SIZE_MAX / 2 + 1) - { - __set_errno (EINVAL); - return 0; - } - - /* Check for overflow. */ - if (bytes > SIZE_MAX - alignment - MINSIZE) - { - __set_errno (ENOMEM); - return 0; - } - - /* Make sure alignment is power of 2. */ - if (!powerof2 (alignment)) - { - size_t a = MALLOC_ALIGNMENT * 2; - while (a < alignment) - a <<= 1; - alignment = a; - } - - __libc_lock_lock (main_arena.mutex); - top_check (); - mem = _int_memalign (&main_arena, alignment, bytes + 1); - __libc_lock_unlock (main_arena.mutex); - return mem2mem_check (tag_new_usable (mem), bytes); -} +#include "malloc-check.c" #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_25) diff --git a/malloc/malloc-check.c b/malloc/malloc-check.c new file mode 100644 index 0000000000..dcab880510 --- /dev/null +++ b/malloc/malloc-check.c @@ -0,0 +1,390 @@ +/* glibc.malloc.check implementation. + Copyright (C) 2001-2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Wolfram Gloger , 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, see . */ + + +/* Whether we are using malloc checking. */ +static int using_malloc_checking; + +/* Activate a standard set of debugging hooks. */ +void +__malloc_check_init (void) +{ + using_malloc_checking = 1; + __malloc_hook = malloc_check; + __free_hook = free_check; + __realloc_hook = realloc_check; + __memalign_hook = memalign_check; +} + +/* When memory is tagged, the checking data is stored in the user part + of the chunk. We can't rely on the user not having modified the + tags, so fetch the tag at each location before dereferencing + it. */ +#define SAFE_CHAR_OFFSET(p,offset) \ + ((unsigned char *) tag_at (((unsigned char *) p) + offset)) + +/* A simple, standard set of debugging hooks. Overhead is `only' one + byte per chunk; still this will catch most cases of double frees or + overruns. The goal here is to avoid obscure crashes due to invalid + usage, unlike in the MALLOC_DEBUG code. */ + +static unsigned char +magicbyte (const void *p) +{ + unsigned char magic; + + magic = (((uintptr_t) p >> 3) ^ ((uintptr_t) p >> 11)) & 0xFF; + /* Do not return 1. See the comment in mem2mem_check(). */ + if (magic == 1) + ++magic; + return magic; +} + +/* Visualize the chunk as being partitioned into blocks of 255 bytes from the + highest address of the chunk, downwards. The end of each block tells + us the size of that block, up to the actual size of the requested + memory. Our magic byte is right at the end of the requested size, so we + must reach it with this iteration, otherwise we have witnessed a memory + corruption. */ +static size_t +malloc_check_get_size (mchunkptr p) +{ + size_t size; + unsigned char c; + unsigned char magic = magicbyte (p); + + assert (using_malloc_checking == 1); + + for (size = CHUNK_HDR_SZ + memsize (p) - 1; + (c = *SAFE_CHAR_OFFSET (p, size)) != magic; + size -= c) + { + if (c <= 0 || size < (c + CHUNK_HDR_SZ)) + malloc_printerr ("malloc_check_get_size: memory corruption"); + } + + /* chunk2mem size. */ + return size - CHUNK_HDR_SZ; +} + +/* Instrument a chunk with overrun detector byte(s) and convert it + into a user pointer with requested size req_sz. */ + +static void * +mem2mem_check (void *ptr, size_t req_sz) +{ + mchunkptr p; + unsigned char *m_ptr = ptr; + size_t max_sz, block_sz, i; + unsigned char magic; + + if (!ptr) + return ptr; + + p = mem2chunk (ptr); + magic = magicbyte (p); + max_sz = memsize (p); + + for (i = max_sz - 1; i > req_sz; i -= block_sz) + { + block_sz = MIN (i - req_sz, 0xff); + /* Don't allow the magic byte to appear in the chain of length bytes. + For the following to work, magicbyte cannot return 0x01. */ + if (block_sz == magic) + --block_sz; + + *SAFE_CHAR_OFFSET (m_ptr, i) = block_sz; + } + *SAFE_CHAR_OFFSET (m_ptr, req_sz) = magic; + return (void *) m_ptr; +} + +/* Convert a pointer to be free()d or realloc()ed to a valid chunk + pointer. If the provided pointer is not valid, return NULL. */ + +static mchunkptr +mem2chunk_check (void *mem, unsigned char **magic_p) +{ + mchunkptr p; + INTERNAL_SIZE_T sz, c; + unsigned char magic; + + if (!aligned_OK (mem)) + return NULL; + + p = mem2chunk (mem); + sz = chunksize (p); + magic = magicbyte (p); + if (!chunk_is_mmapped (p)) + { + /* Must be a chunk in conventional heap memory. */ + int contig = contiguous (&main_arena); + if ((contig && + ((char *) p < mp_.sbrk_base || + ((char *) p + sz) >= (mp_.sbrk_base + main_arena.system_mem))) || + sz < MINSIZE || sz & MALLOC_ALIGN_MASK || !inuse (p) || + (!prev_inuse (p) && ((prev_size (p) & MALLOC_ALIGN_MASK) != 0 || + (contig && (char *) prev_chunk (p) < mp_.sbrk_base) || + next_chunk (prev_chunk (p)) != p))) + return NULL; + + for (sz = CHUNK_HDR_SZ + memsize (p) - 1; + (c = *SAFE_CHAR_OFFSET (p, sz)) != magic; + sz -= c) + { + if (c == 0 || sz < (c + CHUNK_HDR_SZ)) + return NULL; + } + } + else + { + unsigned long offset, page_mask = GLRO (dl_pagesize) - 1; + + /* mmap()ed chunks have MALLOC_ALIGNMENT or higher power-of-two + alignment relative to the beginning of a page. Check this + first. */ + offset = (unsigned long) mem & page_mask; + if ((offset != MALLOC_ALIGNMENT && offset != 0 && offset != 0x10 && + offset != 0x20 && offset != 0x40 && offset != 0x80 && offset != 0x100 && + offset != 0x200 && offset != 0x400 && offset != 0x800 && offset != 0x1000 && + offset < 0x2000) || + !chunk_is_mmapped (p) || prev_inuse (p) || + ((((unsigned long) p - prev_size (p)) & page_mask) != 0) || + ((prev_size (p) + sz) & page_mask) != 0) + return NULL; + + for (sz = CHUNK_HDR_SZ + memsize (p) - 1; + (c = *SAFE_CHAR_OFFSET (p, sz)) != magic; + sz -= c) + { + if (c == 0 || sz < (c + CHUNK_HDR_SZ)) + return NULL; + } + } + + unsigned char* safe_p = SAFE_CHAR_OFFSET (p, sz); + *safe_p ^= 0xFF; + if (magic_p) + *magic_p = safe_p; + return p; +} + +/* Check for corruption of the top chunk. */ +static void +top_check (void) +{ + mchunkptr t = top (&main_arena); + + if (t == initial_top (&main_arena) || + (!chunk_is_mmapped (t) && + chunksize (t) >= MINSIZE && + prev_inuse (t) && + (!contiguous (&main_arena) || + (char *) t + chunksize (t) == mp_.sbrk_base + main_arena.system_mem))) + return; + + malloc_printerr ("malloc: top chunk is corrupt"); +} + +static void * +malloc_check (size_t sz, const void *caller) +{ + void *victim; + size_t nb; + + if (__builtin_add_overflow (sz, 1, &nb)) + { + __set_errno (ENOMEM); + return NULL; + } + + __libc_lock_lock (main_arena.mutex); + top_check (); + victim = _int_malloc (&main_arena, nb); + __libc_lock_unlock (main_arena.mutex); + return mem2mem_check (tag_new_usable (victim), sz); +} + +static void +free_check (void *mem, const void *caller) +{ + mchunkptr p; + + if (!mem) + return; + + int err = errno; + + /* Quickly check that the freed pointer matches the tag for the memory. + This gives a useful double-free detection. */ + if (__glibc_unlikely (mtag_enabled)) + *(volatile char *)mem; + + __libc_lock_lock (main_arena.mutex); + p = mem2chunk_check (mem, NULL); + if (!p) + malloc_printerr ("free(): invalid pointer"); + if (chunk_is_mmapped (p)) + { + __libc_lock_unlock (main_arena.mutex); + munmap_chunk (p); + } + else + { + /* Mark the chunk as belonging to the library again. */ + (void)tag_region (chunk2mem (p), memsize (p)); + _int_free (&main_arena, p, 1); + __libc_lock_unlock (main_arena.mutex); + } + __set_errno (err); +} + +static void * +realloc_check (void *oldmem, size_t bytes, const void *caller) +{ + INTERNAL_SIZE_T chnb; + void *newmem = 0; + unsigned char *magic_p; + size_t rb; + + if (__builtin_add_overflow (bytes, 1, &rb)) + { + __set_errno (ENOMEM); + return NULL; + } + if (oldmem == 0) + return malloc_check (bytes, NULL); + + if (bytes == 0) + { + free_check (oldmem, NULL); + return NULL; + } + + /* Quickly check that the freed pointer matches the tag for the memory. + This gives a useful double-free detection. */ + if (__glibc_unlikely (mtag_enabled)) + *(volatile char *)oldmem; + + __libc_lock_lock (main_arena.mutex); + const mchunkptr oldp = mem2chunk_check (oldmem, &magic_p); + __libc_lock_unlock (main_arena.mutex); + if (!oldp) + malloc_printerr ("realloc(): invalid pointer"); + const INTERNAL_SIZE_T oldsize = chunksize (oldp); + + if (!checked_request2size (rb, &chnb)) + { + __set_errno (ENOMEM); + goto invert; + } + + __libc_lock_lock (main_arena.mutex); + + if (chunk_is_mmapped (oldp)) + { +#if HAVE_MREMAP + mchunkptr newp = mremap_chunk (oldp, chnb); + if (newp) + newmem = chunk2mem_tag (newp); + else +#endif + { + /* Note the extra SIZE_SZ overhead. */ + if (oldsize - SIZE_SZ >= chnb) + newmem = oldmem; /* do nothing */ + else + { + /* Must alloc, copy, free. */ + top_check (); + newmem = _int_malloc (&main_arena, rb); + if (newmem) + { + memcpy (newmem, oldmem, oldsize - CHUNK_HDR_SZ); + munmap_chunk (oldp); + } + } + } + } + else + { + top_check (); + newmem = _int_realloc (&main_arena, oldp, oldsize, chnb); + } + + DIAG_PUSH_NEEDS_COMMENT; +#if __GNUC_PREREQ (7, 0) + /* GCC 7 warns about magic_p may be used uninitialized. But we never + reach here if magic_p is uninitialized. */ + DIAG_IGNORE_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); +#endif + /* mem2chunk_check changed the magic byte in the old chunk. + If newmem is NULL, then the old chunk will still be used though, + so we need to invert that change here. */ +invert: + if (newmem == NULL) + *magic_p ^= 0xFF; + DIAG_POP_NEEDS_COMMENT; + + __libc_lock_unlock (main_arena.mutex); + + return mem2mem_check (tag_new_usable (newmem), bytes); +} + +static void * +memalign_check (size_t alignment, size_t bytes, const void *caller) +{ + void *mem; + + if (alignment <= MALLOC_ALIGNMENT) + return malloc_check (bytes, NULL); + + if (alignment < MINSIZE) + alignment = MINSIZE; + + /* If the alignment is greater than SIZE_MAX / 2 + 1 it cannot be a + power of 2 and will cause overflow in the check below. */ + if (alignment > SIZE_MAX / 2 + 1) + { + __set_errno (EINVAL); + return 0; + } + + /* Check for overflow. */ + if (bytes > SIZE_MAX - alignment - MINSIZE) + { + __set_errno (ENOMEM); + return 0; + } + + /* Make sure alignment is power of 2. */ + if (!powerof2 (alignment)) + { + size_t a = MALLOC_ALIGNMENT * 2; + while (a < alignment) + a <<= 1; + alignment = a; + } + + __libc_lock_lock (main_arena.mutex); + top_check (); + mem = _int_memalign (&main_arena, alignment, bytes + 1); + __libc_lock_unlock (main_arena.mutex); + return mem2mem_check (tag_new_usable (mem), bytes); +} From patchwork Thu Jun 24 18:23:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 44002 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id CDA5F39B042A for ; Thu, 24 Jun 2021 18:25:32 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CDA5F39B042A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624559132; 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Thu, 24 Jun 2021 11:23:35 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a66 To: libc-alpha@sourceware.org Subject: [PATCH 2/8] malloc: Move malloc hook references to hooks.c Date: Thu, 24 Jun 2021 23:53:06 +0530 Message-Id: <20210624182312.236596-3-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624182312.236596-1-siddhesh@sourceware.org> References: <20210624182312.236596-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-3494.2 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_ASCII_DIVIDERS, KAM_DMARC_NONE, KAM_DMARC_STATUS, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NEUTRAL, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Make the core malloc code hooks free and instead only have entry points for _*_debug_before inline functions. This also introduces the first (albeit very constrained) breakage for malloc hooks behaviour. The hook variables no longer call ptmalloc_init, it is called directly on first invocation of an allocator function. This breaks debugging hooks that may depend on overriding the hook symbols with their own implementations due to which ptmalloc_init is never called. In other words, it breaks hooks users that use the malloc hooks to have their own implementation of malloc that is conflicting with glibc malloc, which is not the intended use of the hooks as documented. None of the three debugging hooks in glibc depend on this behaviour and hence continue to work as before. In any case, future patches that move the hooks out into their own layer ought to bring back this functionality. As a result, the breakage will not be visible to the user in the end. Reviewed-by: DJ Delorie --- malloc/arena.c | 2 - malloc/hooks.c | 110 ++++++++++++++++++++++++++++++++------- malloc/malloc-internal.h | 1 + malloc/malloc.c | 85 ++++++++++-------------------- 4 files changed, 119 insertions(+), 79 deletions(-) diff --git a/malloc/arena.c b/malloc/arena.c index 7eb110445e..1861d20006 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -44,8 +44,6 @@ /***************************************************************************/ -#define top(ar_ptr) ((ar_ptr)->top) - /* A heap is a single contiguous memory region holding (coalesceable) malloc_chunks. It is allocated with mmap() and always starts at an address aligned to HEAP_MAX_SIZE. */ diff --git a/malloc/hooks.c b/malloc/hooks.c index 57a9b55788..4960aafd08 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -21,35 +21,107 @@ corrupt pointer is detected: do nothing (0), print an error message (1), or call abort() (2). */ -/* Hooks for debugging versions. The initial hooks just call the - initialization routine, then do the normal work. */ +/* Define and initialize the hook variables. These weak definitions must + appear before any use of the variables in a function (arena.c uses one). */ +#ifndef weak_variable +/* In GNU libc we want the hook variables to be weak definitions to + avoid a problem with Emacs. */ +# define weak_variable weak_function +#endif + +/* Forward declarations. */ + +#if HAVE_MALLOC_INIT_HOOK +void (*__malloc_initialize_hook) (void) __attribute__ ((nocommon)); +compat_symbol (libc, __malloc_initialize_hook, + __malloc_initialize_hook, GLIBC_2_0); +#endif + +void weak_variable (*__free_hook) (void *__ptr, + const void *) = NULL; +void *weak_variable (*__malloc_hook) + (size_t __size, const void *) = NULL; +void *weak_variable (*__realloc_hook) + (void *__ptr, size_t __size, const void *) = NULL; +void *weak_variable (*__memalign_hook) + (size_t __alignment, size_t __size, const void *) = NULL; + +static void ptmalloc_init (void); -static void * -malloc_hook_ini (size_t sz, const void *caller) +#include "malloc-check.c" + +static __always_inline bool +_malloc_debug_before (size_t bytes, void **victimp, const void *address) { - __malloc_hook = NULL; - ptmalloc_init (); - return __libc_malloc (sz); + _Static_assert (PTRDIFF_MAX <= SIZE_MAX / 2, + "PTRDIFF_MAX is not more than half of SIZE_MAX"); + + void *(*hook) (size_t, const void *) + = atomic_forced_read (__malloc_hook); + if (__builtin_expect (hook != NULL, 0)) + { + *victimp = (*hook)(bytes, address); + return true; + } + return false; } -static void * -realloc_hook_ini (void *ptr, size_t sz, const void *caller) +static __always_inline bool +_free_debug_before (void *mem, const void *address) { - __malloc_hook = NULL; - __realloc_hook = NULL; - ptmalloc_init (); - return __libc_realloc (ptr, sz); + void (*hook) (void *, const void *) + = atomic_forced_read (__free_hook); + if (__builtin_expect (hook != NULL, 0)) + { + (*hook)(mem, address); + return true; + } + return false; } -static void * -memalign_hook_ini (size_t alignment, size_t sz, const void *caller) +static __always_inline bool +_realloc_debug_before (void *oldmem, size_t bytes, void **victimp, + const void *address) { - __memalign_hook = NULL; - ptmalloc_init (); - return __libc_memalign (alignment, sz); + void *(*hook) (void *, size_t, const void *) = + atomic_forced_read (__realloc_hook); + if (__builtin_expect (hook != NULL, 0)) + { + *victimp = (*hook)(oldmem, bytes, address); + return true; + } + + return false; } -#include "malloc-check.c" +static __always_inline bool +_memalign_debug_before (size_t alignment, size_t bytes, void **victimp, + const void *address) +{ + void *(*hook) (size_t, size_t, const void *) = + atomic_forced_read (__memalign_hook); + if (__builtin_expect (hook != NULL, 0)) + { + *victimp = (*hook)(alignment, bytes, address); + return true; + } + return false; +} + +static __always_inline bool +_calloc_debug_before (size_t bytes, void **victimp, const void *address) +{ + void *(*hook) (size_t, const void *) = + atomic_forced_read (__malloc_hook); + if (__builtin_expect (hook != NULL, 0)) + { + *victimp = (*hook)(bytes, address); + if (*victimp != NULL) + memset (*victimp, 0, bytes); + return true; + } + return false; +} #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_25) diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h index 258f29584e..ee0f5697af 100644 --- a/malloc/malloc-internal.h +++ b/malloc/malloc-internal.h @@ -61,6 +61,7 @@ /* The corresponding bit mask value. */ #define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1) +#define top(ar_ptr) ((ar_ptr)->top) /* Called in the parent process before a fork. */ void __malloc_fork_lock_parent (void) attribute_hidden; diff --git a/malloc/malloc.c b/malloc/malloc.c index 0e2e1747e0..75ca6ec3f0 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -2013,30 +2013,6 @@ static void malloc_consolidate (mstate); # define weak_variable weak_function #endif -/* Forward declarations. */ -static void *malloc_hook_ini (size_t sz, - const void *caller) __THROW; -static void *realloc_hook_ini (void *ptr, size_t sz, - const void *caller) __THROW; -static void *memalign_hook_ini (size_t alignment, size_t sz, - const void *caller) __THROW; - -#if HAVE_MALLOC_INIT_HOOK -void (*__malloc_initialize_hook) (void) __attribute__ ((nocommon)); -compat_symbol (libc, __malloc_initialize_hook, - __malloc_initialize_hook, GLIBC_2_0); -#endif - -void weak_variable (*__free_hook) (void *__ptr, - const void *) = NULL; -void *weak_variable (*__malloc_hook) - (size_t __size, const void *) = malloc_hook_ini; -void *weak_variable (*__realloc_hook) - (void *__ptr, size_t __size, const void *) - = realloc_hook_ini; -void *weak_variable (*__memalign_hook) - (size_t __alignment, size_t __size, const void *) - = memalign_hook_ini; void weak_variable (*__after_morecore_hook) (void) = NULL; /* This function is called from the arena shutdown hook, to free the @@ -2065,6 +2041,9 @@ free_perturb (char *p, size_t n) #include +/* ----------------- Support for debugging hooks -------------------- */ +#include "hooks.c" + /* ------------------- Support for multiple arenas -------------------- */ #include "arena.c" @@ -2425,10 +2404,6 @@ do_check_malloc_state (mstate av) #endif -/* ----------------- Support for debugging hooks -------------------- */ -#include "hooks.c" - - /* ----------- Routines dealing with system allocation -------------- */ /* @@ -3225,13 +3200,12 @@ __libc_malloc (size_t bytes) mstate ar_ptr; void *victim; - _Static_assert (PTRDIFF_MAX <= SIZE_MAX / 2, - "PTRDIFF_MAX is not more than half of SIZE_MAX"); + if (__malloc_initialized < 0) + ptmalloc_init (); + + if (_malloc_debug_before (bytes, &victim, RETURN_ADDRESS (0))) + return victim; - void *(*hook) (size_t, const void *) - = atomic_forced_read (__malloc_hook); - if (__builtin_expect (hook != NULL, 0)) - return (*hook)(bytes, RETURN_ADDRESS (0)); #if USE_TCACHE /* int_free also calls request2size, be careful to not pad twice. */ size_t tbytes; @@ -3292,13 +3266,11 @@ __libc_free (void *mem) mstate ar_ptr; mchunkptr p; /* chunk corresponding to mem */ - void (*hook) (void *, const void *) - = atomic_forced_read (__free_hook); - if (__builtin_expect (hook != NULL, 0)) - { - (*hook)(mem, RETURN_ADDRESS (0)); - return; - } + if (__malloc_initialized < 0) + ptmalloc_init (); + + if (_free_debug_before (mem, RETURN_ADDRESS (0))) + return; if (mem == 0) /* free(0) has no effect */ return; @@ -3351,10 +3323,11 @@ __libc_realloc (void *oldmem, size_t bytes) void *newp; /* chunk to return */ - void *(*hook) (void *, size_t, const void *) = - atomic_forced_read (__realloc_hook); - if (__builtin_expect (hook != NULL, 0)) - return (*hook)(oldmem, bytes, RETURN_ADDRESS (0)); + if (__malloc_initialized < 0) + ptmalloc_init (); + + if (_realloc_debug_before (oldmem, bytes, &newp, RETURN_ADDRESS (0))) + return newp; #if REALLOC_ZERO_BYTES_FREES if (bytes == 0 && oldmem != NULL) @@ -3490,6 +3463,9 @@ void * __libc_memalign (size_t alignment, size_t bytes) { void *address = RETURN_ADDRESS (0); + if (__malloc_initialized < 0) + ptmalloc_init (); + return _mid_memalign (alignment, bytes, address); } @@ -3499,10 +3475,8 @@ _mid_memalign (size_t alignment, size_t bytes, void *address) mstate ar_ptr; void *p; - void *(*hook) (size_t, size_t, const void *) = - atomic_forced_read (__memalign_hook); - if (__builtin_expect (hook != NULL, 0)) - return (*hook)(alignment, bytes, address); + if (_memalign_debug_before (alignment, bytes, &p, address)) + return p; /* If we need less alignment than we give anyway, just relay to malloc. */ if (alignment <= MALLOC_ALIGNMENT) @@ -3612,16 +3586,11 @@ __libc_calloc (size_t n, size_t elem_size) sz = bytes; - void *(*hook) (size_t, const void *) = - atomic_forced_read (__malloc_hook); - if (__builtin_expect (hook != NULL, 0)) - { - mem = (*hook)(sz, RETURN_ADDRESS (0)); - if (mem == 0) - return 0; + if (__malloc_initialized < 0) + ptmalloc_init (); - return memset (mem, 0, sz); - } + if (_calloc_debug_before (sz, &mem, RETURN_ADDRESS (0))) + return mem; MAYBE_INIT_TCACHE (); From patchwork Thu Jun 24 18:23:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 44003 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id D137739B041F for ; Thu, 24 Jun 2021 18:26:17 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D137739B041F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624559177; bh=9+2BTxAwHCvLhKlyWfxdrWx+VI8ThbuVbP8v057N/m0=; 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Thu, 24 Jun 2021 11:23:39 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a66 To: libc-alpha@sourceware.org Subject: [PATCH 3/8] glibc.malloc.check: Wean away from malloc hooks Date: Thu, 24 Jun 2021 23:53:07 +0530 Message-Id: <20210624182312.236596-4-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624182312.236596-1-siddhesh@sourceware.org> References: <20210624182312.236596-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-3494.6 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NEUTRAL, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Set up a new internal debugging hooks flag variable and migrate glibc.malloc.check to it so that it no longer uses the malloc hooks. Reviewed-by: DJ Delorie --- malloc/arena.c | 4 +-- malloc/hooks.c | 63 ++++++++++++++++++++++++++++++++++++++++++- malloc/malloc-check.c | 30 ++++++--------------- malloc/malloc.c | 9 +------ 4 files changed, 73 insertions(+), 33 deletions(-) diff --git a/malloc/arena.c b/malloc/arena.c index 1861d20006..357a3b0b30 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -210,7 +210,7 @@ TUNABLE_CALLBACK (set_mallopt_check) (tunable_val_t *valp) { int32_t value = (int32_t) valp->numval; if (value != 0) - __malloc_check_init (); + __malloc_debug_enable (MALLOC_CHECK_HOOK); } # define TUNABLE_CALLBACK_FNDECL(__name, __type) \ @@ -400,7 +400,7 @@ ptmalloc_init (void) } } if (s && s[0] != '\0' && s[0] != '0') - __malloc_check_init (); + __malloc_debug_enable (MALLOC_CHECK_HOOK); #endif #if HAVE_MALLOC_INIT_HOOK diff --git a/malloc/hooks.c b/malloc/hooks.c index 4960aafd08..77855801c8 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -21,6 +21,8 @@ corrupt pointer is detected: do nothing (0), print an error message (1), or call abort() (2). */ +# include + /* Define and initialize the hook variables. These weak definitions must appear before any use of the variables in a function (arena.c uses one). */ #ifndef weak_variable @@ -29,6 +31,14 @@ # define weak_variable weak_function #endif +/* The internal malloc debugging hooks. */ +enum malloc_debug_hooks +{ + MALLOC_NONE_HOOK = 0, + MALLOC_CHECK_HOOK = 1 << 0, /* MALLOC_CHECK_ or glibc.malloc.check. */ +}; +static unsigned __malloc_debugging_hooks; + /* Forward declarations. */ #if HAVE_MALLOC_INIT_HOOK @@ -48,6 +58,24 @@ void *weak_variable (*__memalign_hook) static void ptmalloc_init (void); +static __always_inline bool +__is_malloc_debug_enabled (enum malloc_debug_hooks flag) +{ + return __malloc_debugging_hooks & flag; +} + +static __always_inline void +__malloc_debug_enable (enum malloc_debug_hooks flag) +{ + __malloc_debugging_hooks |= flag; +} + +static __always_inline void +__malloc_debug_disable (enum malloc_debug_hooks flag) +{ + __malloc_debugging_hooks &= ~flag; +} + #include "malloc-check.c" static __always_inline bool @@ -63,6 +91,12 @@ _malloc_debug_before (size_t bytes, void **victimp, const void *address) *victimp = (*hook)(bytes, address); return true; } + + if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + { + *victimp = malloc_check (bytes); + return true; + } return false; } @@ -76,6 +110,12 @@ _free_debug_before (void *mem, const void *address) (*hook)(mem, address); return true; } + + if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + { + free_check (mem); + return true; + } return false; } @@ -91,6 +131,12 @@ _realloc_debug_before (void *oldmem, size_t bytes, void **victimp, return true; } + if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + { + *victimp = realloc_check (oldmem, bytes); + return true; + } + return false; } @@ -105,6 +151,13 @@ _memalign_debug_before (size_t alignment, size_t bytes, void **victimp, *victimp = (*hook)(alignment, bytes, address); return true; } + + if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + { + *victimp = memalign_check (alignment, bytes); + return true; + } + return false; } @@ -120,6 +173,14 @@ _calloc_debug_before (size_t bytes, void **victimp, const void *address) memset (*victimp, 0, bytes); return true; } + + if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + { + *victimp = malloc_check (bytes); + if (*victimp != NULL) + memset (*victimp, 0, bytes); + return true; + } return false; } @@ -195,7 +256,7 @@ malloc_set_state (void *msptr) __realloc_hook = NULL; __free_hook = NULL; __memalign_hook = NULL; - using_malloc_checking = 0; + __malloc_debug_disable (MALLOC_CHECK_HOOK); /* Patch the dumped heap. We no longer try to integrate into the existing heap. Instead, we mark the existing chunks as mmapped. diff --git a/malloc/malloc-check.c b/malloc/malloc-check.c index dcab880510..a85e519498 100644 --- a/malloc/malloc-check.c +++ b/malloc/malloc-check.c @@ -18,20 +18,6 @@ not, see . */ -/* Whether we are using malloc checking. */ -static int using_malloc_checking; - -/* Activate a standard set of debugging hooks. */ -void -__malloc_check_init (void) -{ - using_malloc_checking = 1; - __malloc_hook = malloc_check; - __free_hook = free_check; - __realloc_hook = realloc_check; - __memalign_hook = memalign_check; -} - /* When memory is tagged, the checking data is stored in the user part of the chunk. We can't rely on the user not having modified the tags, so fetch the tag at each location before dereferencing @@ -69,7 +55,7 @@ malloc_check_get_size (mchunkptr p) unsigned char c; unsigned char magic = magicbyte (p); - assert (using_malloc_checking == 1); + assert (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)); for (size = CHUNK_HDR_SZ + memsize (p) - 1; (c = *SAFE_CHAR_OFFSET (p, size)) != magic; @@ -203,7 +189,7 @@ top_check (void) } static void * -malloc_check (size_t sz, const void *caller) +malloc_check (size_t sz) { void *victim; size_t nb; @@ -222,7 +208,7 @@ malloc_check (size_t sz, const void *caller) } static void -free_check (void *mem, const void *caller) +free_check (void *mem) { mchunkptr p; @@ -256,7 +242,7 @@ free_check (void *mem, const void *caller) } static void * -realloc_check (void *oldmem, size_t bytes, const void *caller) +realloc_check (void *oldmem, size_t bytes) { INTERNAL_SIZE_T chnb; void *newmem = 0; @@ -269,11 +255,11 @@ realloc_check (void *oldmem, size_t bytes, const void *caller) return NULL; } if (oldmem == 0) - return malloc_check (bytes, NULL); + return malloc_check (bytes); if (bytes == 0) { - free_check (oldmem, NULL); + free_check (oldmem); return NULL; } @@ -348,12 +334,12 @@ invert: } static void * -memalign_check (size_t alignment, size_t bytes, const void *caller) +memalign_check (size_t alignment, size_t bytes) { void *mem; if (alignment <= MALLOC_ALIGNMENT) - return malloc_check (bytes, NULL); + return malloc_check (bytes); if (alignment < MINSIZE) alignment = MINSIZE; diff --git a/malloc/malloc.c b/malloc/malloc.c index 75ca6ec3f0..60753446a1 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -1124,13 +1124,6 @@ static void munmap_chunk(mchunkptr p); static mchunkptr mremap_chunk(mchunkptr p, size_t new_size); #endif -static void* malloc_check(size_t sz, const void *caller); -static void free_check(void* mem, const void *caller); -static void* realloc_check(void* oldmem, size_t bytes, - const void *caller); -static void* memalign_check(size_t alignment, size_t bytes, - const void *caller); - /* ------------------ MMAP support ------------------ */ @@ -5078,7 +5071,7 @@ musable (void *mem) p = mem2chunk (mem); - if (__builtin_expect (using_malloc_checking == 1, 0)) + if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) return malloc_check_get_size (p); if (chunk_is_mmapped (p)) From patchwork Thu Jun 24 18:23:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 44005 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 63CDC39B2407 for ; Thu, 24 Jun 2021 18:27:48 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 63CDC39B2407 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624559268; bh=dMa4+FErIUT9KPdqd7B8w/DQzA9eVtluM72IJm74MqM=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; 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Thu, 24 Jun 2021 18:23:46 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|siddhesh@gotplt.org X-MailChannels-Auth-Id: dreamhost X-Well-Made-Power: 0628b34922e53368_1624559026281_2030316935 X-MC-Loop-Signature: 1624559026281:2639102962 X-MC-Ingress-Time: 1624559026280 Received: from pdx1-sub0-mail-a66.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTP id 9E7CF8DD5F; Thu, 24 Jun 2021 11:23:45 -0700 (PDT) Received: from rhbox.intra.reserved-bit.com (unknown [1.186.101.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTPSA id A29608CE56; Thu, 24 Jun 2021 11:23:42 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a66 To: libc-alpha@sourceware.org Subject: [PATCH 4/8] mcheck: Wean away from malloc hooks Date: Thu, 24 Jun 2021 23:53:08 +0530 Message-Id: <20210624182312.236596-5-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624182312.236596-1-siddhesh@sourceware.org> References: <20210624182312.236596-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-3494.6 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NEUTRAL, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Split the mcheck implementation into the debugging hooks and the user visible implementation so that the debugging hooks (in mcheck-hooks.c) can be embedded like malloc-check.c. Further, add *_debug_after debugging hooks into malloc so that mcheck can then be adapted to using the debugging hooks instead of fiddling with hooks variables. This adds an extra conditional branch at the end of the allocator functions but it should have minimal effect in the default use case. Initialization using -lmcheck now depends on a new exported variable __libc_lmcheck which is a const flag that mcheck-init can override. While this simplifies the mcheck implementation, it still does not make the interface thread safe as access to its internal structures is still unprotected. --- include/malloc.h | 10 +- malloc/Makefile | 4 +- malloc/Versions | 3 + malloc/arena.c | 5 + malloc/hooks.c | 132 ++++-- malloc/malloc.c | 113 +++-- malloc/mcheck-hooks.c | 411 ++++++++++++++++++ malloc/mcheck-init.c | 14 +- malloc/mcheck.c | 369 +--------------- sysdeps/mach/hurd/i386/libc.abilist | 1 + sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 + sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 + sysdeps/unix/sysv/linux/arc/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 + sysdeps/unix/sysv/linux/csky/libc.abilist | 1 + sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 + sysdeps/unix/sysv/linux/i386/libc.abilist | 1 + sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 + .../sysv/linux/m68k/coldfire/libc.abilist | 1 + .../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 + .../sysv/linux/microblaze/be/libc.abilist | 1 + .../sysv/linux/microblaze/le/libc.abilist | 1 + .../sysv/linux/mips/mips32/fpu/libc.abilist | 1 + .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 + .../sysv/linux/mips/mips64/n32/libc.abilist | 1 + .../sysv/linux/mips/mips64/n64/libc.abilist | 1 + sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 + .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 + .../powerpc/powerpc32/nofpu/libc.abilist | 1 + .../linux/powerpc/powerpc64/be/libc.abilist | 1 + .../linux/powerpc/powerpc64/le/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv32/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv64/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 + .../sysv/linux/sparc/sparc32/libc.abilist | 1 + .../sysv/linux/sparc/sparc64/libc.abilist | 1 + .../unix/sysv/linux/x86_64/64/libc.abilist | 1 + .../unix/sysv/linux/x86_64/x32/libc.abilist | 1 + 42 files changed, 647 insertions(+), 447 deletions(-) create mode 100644 malloc/mcheck-hooks.c diff --git a/include/malloc.h b/include/malloc.h index b77761f74d..bb1123d9d3 100644 --- a/include/malloc.h +++ b/include/malloc.h @@ -4,6 +4,11 @@ # ifndef _ISOMAC # include +# include +# include + +struct malloc_state; +typedef struct malloc_state *mstate; /* In the GNU libc we rename the global variable `__malloc_initialized' to `__libc_malloc_initialized'. */ @@ -11,8 +16,9 @@ /* Nonzero if the malloc is already initialized. */ extern int __malloc_initialized attribute_hidden; -struct malloc_state; -typedef struct malloc_state *mstate; +enum mcheck_status __mcheck_checkptr (const void *) attribute_hidden; +extern int __mcheck_initialize (void (*) (enum mcheck_status), bool) + attribute_hidden; # endif /* !_ISOMAC */ diff --git a/malloc/Makefile b/malloc/Makefile index fd7f399250..f9433af880 100644 --- a/malloc/Makefile +++ b/malloc/Makefile @@ -90,9 +90,7 @@ tests-exclude-mcheck = tst-mallocstate \ tst-malloc-usable-static \ tst-malloc-usable-static-tunables \ tst-malloc-usable-tunables \ - tst-malloc_info \ - tst-memalign \ - tst-posix_memalign + tst-malloc_info tests-mcheck = $(filter-out $(tests-exclude-mcheck), $(tests)) diff --git a/malloc/Versions b/malloc/Versions index 62e4698a08..e138eaa24b 100644 --- a/malloc/Versions +++ b/malloc/Versions @@ -67,6 +67,9 @@ libc { GLIBC_2.33 { mallinfo2; } + GLIBC_2.34 { + __libc_lmcheck; + } GLIBC_PRIVATE { # Internal startup hook for libpthread. __libc_malloc_pthread_startup; diff --git a/malloc/arena.c b/malloc/arena.c index 357a3b0b30..a8500a25c9 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -403,6 +403,11 @@ ptmalloc_init (void) __malloc_debug_enable (MALLOC_CHECK_HOOK); #endif +#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34) + if (__libc_lmcheck) + __mcheck_initialize (NULL, false); +#endif + #if HAVE_MALLOC_INIT_HOOK void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook); if (hook != NULL) diff --git a/malloc/hooks.c b/malloc/hooks.c index 77855801c8..b517a98ea2 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -36,6 +36,7 @@ enum malloc_debug_hooks { MALLOC_NONE_HOOK = 0, MALLOC_CHECK_HOOK = 1 << 0, /* MALLOC_CHECK_ or glibc.malloc.check. */ + MALLOC_MCHECK_HOOK = 1 << 1, /* mcheck() */ }; static unsigned __malloc_debugging_hooks; @@ -77,113 +78,180 @@ __malloc_debug_disable (enum malloc_debug_hooks flag) } #include "malloc-check.c" +#include "mcheck-hooks.c" static __always_inline bool -_malloc_debug_before (size_t bytes, void **victimp, const void *address) +_malloc_debug_before (size_t *bytesp, void **victimp, const void *address) { _Static_assert (PTRDIFF_MAX <= SIZE_MAX / 2, - "PTRDIFF_MAX is not more than half of SIZE_MAX"); + "PTRDIFF_MAX is not more than half of SIZE_MAX"); void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook); if (__builtin_expect (hook != NULL, 0)) { - *victimp = (*hook)(bytes, address); + *victimp = (*hook)(*bytesp, address); return true; } - if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + if (__glibc_unlikely (__malloc_debugging_hooks)) { - *victimp = malloc_check (bytes); - return true; + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) + && malloc_mcheck_before (bytesp, victimp)) + return true; + if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)) + { + *victimp = malloc_check (*bytesp); + return true; + } } return false; } +static __always_inline void * +_malloc_debug_after (void *mem, size_t bytes, const void *address) +{ + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) + mem = malloc_mcheck_after (mem, bytes); + return mem; +} + static __always_inline bool -_free_debug_before (void *mem, const void *address) +_free_debug_before (void **mem, const void *address) { void (*hook) (void *, const void *) = atomic_forced_read (__free_hook); if (__builtin_expect (hook != NULL, 0)) { - (*hook)(mem, address); + (*hook)(*mem, address); return true; } - if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + if (__glibc_unlikely (__malloc_debugging_hooks)) { - free_check (mem); - return true; + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)) + *mem = free_mcheck (*mem); + if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)) + { + free_check (*mem); + return true; + } } return false; } static __always_inline bool -_realloc_debug_before (void *oldmem, size_t bytes, void **victimp, - const void *address) +_realloc_debug_before (void **oldmem, size_t *bytesp, size_t *oldsize, + void **victimp, const void *address) { void *(*hook) (void *, size_t, const void *) = atomic_forced_read (__realloc_hook); if (__builtin_expect (hook != NULL, 0)) { - *victimp = (*hook)(oldmem, bytes, address); + *victimp = (*hook)(*oldmem, *bytesp, address); return true; } - if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + if (__glibc_unlikely (__malloc_debugging_hooks)) { - *victimp = realloc_check (oldmem, bytes); - return true; + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) + && realloc_mcheck_before (oldmem, bytesp, oldsize, victimp)) + return true; + if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)) + { + *victimp = realloc_check (*oldmem, *bytesp); + return true; + } } return false; } +static __always_inline void * +_realloc_debug_after (void *mem, void *oldmem, size_t bytes, size_t oldsize, + const void *address) +{ + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) + mem = realloc_mcheck_after (mem, oldmem, bytes, oldsize); + return mem; +} + static __always_inline bool -_memalign_debug_before (size_t alignment, size_t bytes, void **victimp, - const void *address) +_memalign_debug_before (size_t alignment, size_t *bytesp, void **victimp, + const void *address) { void *(*hook) (size_t, size_t, const void *) = atomic_forced_read (__memalign_hook); if (__builtin_expect (hook != NULL, 0)) { - *victimp = (*hook)(alignment, bytes, address); + *victimp = (*hook)(alignment, *bytesp, address); return true; } - - if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + if (__glibc_unlikely (__malloc_debugging_hooks)) { - *victimp = memalign_check (alignment, bytes); - return true; + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) + && memalign_mcheck_before (alignment, bytesp, victimp)) + return true; + if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)) + { + *victimp = memalign_check (alignment, *bytesp); + return true; + } } return false; } +static __always_inline void * +_memalign_debug_after (void *mem, size_t alignment, size_t bytes, + const void *address) +{ + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) + mem = memalign_mcheck_after (mem, alignment, bytes); + return mem; +} + static __always_inline bool -_calloc_debug_before (size_t bytes, void **victimp, const void *address) +_calloc_debug_before (size_t *bytesp, void **victimp, const void *address) { void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook); if (__builtin_expect (hook != NULL, 0)) { - *victimp = (*hook)(bytes, address); + *victimp = (*hook)(*bytesp, address); + if (*victimp != NULL) - memset (*victimp, 0, bytes); + memset (*victimp, 0, *bytesp); + return true; } - if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))) + if (__glibc_unlikely (__malloc_debugging_hooks)) { - *victimp = malloc_check (bytes); - if (*victimp != NULL) - memset (*victimp, 0, bytes); - return true; + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) + && malloc_mcheck_before (bytesp, victimp)) + return true; + if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)) + { + *victimp = malloc_check (*bytesp); + return true; + } } return false; } +static __always_inline void * +_calloc_debug_after (void *mem, size_t bytes, const void *address) +{ + if (__glibc_unlikely (__malloc_debugging_hooks) && mem != NULL) + { + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)) + mem = malloc_mcheck_after (mem, bytes); + memset (mem, 0, bytes); + } + return mem; +} + #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_25) /* Support for restoring dumped heaps contained in historic Emacs diff --git a/malloc/malloc.c b/malloc/malloc.c index 60753446a1..5ea12d1d3b 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -3192,12 +3192,13 @@ __libc_malloc (size_t bytes) { mstate ar_ptr; void *victim; + size_t orig_bytes = bytes; if (__malloc_initialized < 0) ptmalloc_init (); - if (_malloc_debug_before (bytes, &victim, RETURN_ADDRESS (0))) - return victim; + if (_malloc_debug_before (&bytes, &victim, RETURN_ADDRESS (0))) + goto out; #if USE_TCACHE /* int_free also calls request2size, be careful to not pad twice. */ @@ -3205,7 +3206,8 @@ __libc_malloc (size_t bytes) if (!checked_request2size (bytes, &tbytes)) { __set_errno (ENOMEM); - return NULL; + victim = NULL; + goto out; } size_t tc_idx = csize2tidx (tbytes); @@ -3217,7 +3219,8 @@ __libc_malloc (size_t bytes) && tcache->counts[tc_idx] > 0) { victim = tcache_get (tc_idx); - return tag_new_usable (victim); + victim = tag_new_usable (victim); + goto out; } DIAG_POP_NEEDS_COMMENT; #endif @@ -3227,7 +3230,7 @@ __libc_malloc (size_t bytes) victim = tag_new_usable (_int_malloc (&main_arena, bytes)); assert (!victim || chunk_is_mmapped (mem2chunk (victim)) || &main_arena == arena_for_chunk (mem2chunk (victim))); - return victim; + goto out; } arena_get (ar_ptr, bytes); @@ -3249,7 +3252,9 @@ __libc_malloc (size_t bytes) assert (!victim || chunk_is_mmapped (mem2chunk (victim)) || ar_ptr == arena_for_chunk (mem2chunk (victim))); - return victim; + +out: + return _malloc_debug_after (victim, orig_bytes, RETURN_ADDRESS (0)); } libc_hidden_def (__libc_malloc) @@ -3262,7 +3267,7 @@ __libc_free (void *mem) if (__malloc_initialized < 0) ptmalloc_init (); - if (_free_debug_before (mem, RETURN_ADDRESS (0))) + if (_free_debug_before (&mem, RETURN_ADDRESS (0))) return; if (mem == 0) /* free(0) has no effect */ @@ -3315,23 +3320,30 @@ __libc_realloc (void *oldmem, size_t bytes) INTERNAL_SIZE_T nb; /* padded request size */ void *newp; /* chunk to return */ + size_t orig_bytes = bytes, debug_osize = 0; if (__malloc_initialized < 0) ptmalloc_init (); - if (_realloc_debug_before (oldmem, bytes, &newp, RETURN_ADDRESS (0))) - return newp; + if (_realloc_debug_before (&oldmem, &bytes, &debug_osize, &newp, + RETURN_ADDRESS (0))) + goto out; #if REALLOC_ZERO_BYTES_FREES if (bytes == 0 && oldmem != NULL) { - __libc_free (oldmem); return 0; + __libc_free (oldmem); + newp = NULL; + goto out; } #endif /* realloc of null is supposed to be same as malloc */ if (oldmem == 0) - return __libc_malloc (bytes); + { + newp = __libc_malloc (bytes); + goto out; + } /* Perform a quick check to ensure that the pointer's tag matches the memory's tag. */ @@ -3365,7 +3377,8 @@ __libc_realloc (void *oldmem, size_t bytes) if (!checked_request2size (bytes, &nb)) { __set_errno (ENOMEM); - return NULL; + newp = NULL; + goto out; } if (chunk_is_mmapped (oldp)) @@ -3377,7 +3390,10 @@ __libc_realloc (void *oldmem, size_t bytes) /* Must alloc, copy, free. */ void *newmem = __libc_malloc (bytes); if (newmem == 0) - return NULL; + { + newp = NULL; + goto out; + } /* Copy as many bytes as are available from the old chunk and fit into the new size. NB: The overhead for faked mmapped chunks is only SIZE_SZ, not CHUNK_HDR_SZ as for @@ -3385,7 +3401,8 @@ __libc_realloc (void *oldmem, size_t bytes) if (bytes > oldsize - SIZE_SZ) bytes = oldsize - SIZE_SZ; memcpy (newmem, oldmem, bytes); - return newmem; + newp = newmem; + goto out; } void *newmem; @@ -3400,21 +3417,29 @@ __libc_realloc (void *oldmem, size_t bytes) reused. There's a performance hit for both us and the caller for doing this, so we might want to reconsider. */ - return tag_new_usable (newmem); + newp = tag_new_usable (newmem); + goto out; } #endif /* Note the extra SIZE_SZ overhead. */ if (oldsize - SIZE_SZ >= nb) - return oldmem; /* do nothing */ + { + newp = oldmem; /* do nothing */ + goto out; + } /* Must alloc, copy, free. */ newmem = __libc_malloc (bytes); if (newmem == 0) - return 0; /* propagate failure */ + { + newp = NULL; /* propagate failure */ + goto out; + } memcpy (newmem, oldmem, oldsize - CHUNK_HDR_SZ); munmap_chunk (oldp); - return newmem; + newp = newmem; + goto out; } if (SINGLE_THREAD_P) @@ -3423,7 +3448,7 @@ __libc_realloc (void *oldmem, size_t bytes) assert (!newp || chunk_is_mmapped (mem2chunk (newp)) || ar_ptr == arena_for_chunk (mem2chunk (newp))); - return newp; + goto out; } __libc_lock_lock (ar_ptr->mutex); @@ -3448,7 +3473,9 @@ __libc_realloc (void *oldmem, size_t bytes) } } - return newp; +out: + return _realloc_debug_after (newp, oldmem, orig_bytes, debug_osize, + RETURN_ADDRESS (0)); } libc_hidden_def (__libc_realloc) @@ -3467,13 +3494,17 @@ _mid_memalign (size_t alignment, size_t bytes, void *address) { mstate ar_ptr; void *p; + size_t orig_bytes = bytes; - if (_memalign_debug_before (alignment, bytes, &p, address)) - return p; + if (_memalign_debug_before (alignment, &bytes, &p, address)) + goto out; /* If we need less alignment than we give anyway, just relay to malloc. */ if (alignment <= MALLOC_ALIGNMENT) - return __libc_malloc (bytes); + { + p = __libc_malloc (bytes); + goto out; + } /* Otherwise, ensure that it is at least a minimum chunk size */ if (alignment < MINSIZE) @@ -3484,7 +3515,8 @@ _mid_memalign (size_t alignment, size_t bytes, void *address) if (alignment > SIZE_MAX / 2 + 1) { __set_errno (EINVAL); - return 0; + p = NULL; + goto out; } @@ -3502,7 +3534,8 @@ _mid_memalign (size_t alignment, size_t bytes, void *address) p = _int_memalign (&main_arena, alignment, bytes); assert (!p || chunk_is_mmapped (mem2chunk (p)) || &main_arena == arena_for_chunk (mem2chunk (p))); - return tag_new_usable (p); + p = tag_new_usable (p); + goto out; } arena_get (ar_ptr, bytes + alignment + MINSIZE); @@ -3520,7 +3553,9 @@ _mid_memalign (size_t alignment, size_t bytes, void *address) assert (!p || chunk_is_mmapped (mem2chunk (p)) || ar_ptr == arena_for_chunk (mem2chunk (p))); - return tag_new_usable (p); + p = tag_new_usable (p); +out: + return _memalign_debug_after (p, alignment, orig_bytes, RETURN_ADDRESS (0)); } /* For ISO C11. */ weak_alias (__libc_memalign, aligned_alloc) @@ -3582,8 +3617,8 @@ __libc_calloc (size_t n, size_t elem_size) if (__malloc_initialized < 0) ptmalloc_init (); - if (_calloc_debug_before (sz, &mem, RETURN_ADDRESS (0))) - return mem; + if (_calloc_debug_before (&sz, &mem, RETURN_ADDRESS (0))) + goto out; MAYBE_INIT_TCACHE (); @@ -3639,7 +3674,10 @@ __libc_calloc (size_t n, size_t elem_size) /* Allocation failed even after a retry. */ if (mem == 0) - return 0; + { + mem = NULL; + goto out; + } mchunkptr p = mem2chunk (mem); @@ -3647,7 +3685,10 @@ __libc_calloc (size_t n, size_t elem_size) regardless of MORECORE_CLEARS, so we zero the whole block while doing so. */ if (__glibc_unlikely (mtag_enabled)) - return tag_new_zero_region (mem, memsize (p)); + { + mem = tag_new_zero_region (mem, memsize (p)); + goto out; + } INTERNAL_SIZE_T csz = chunksize (p); @@ -3655,9 +3696,9 @@ __libc_calloc (size_t n, size_t elem_size) if (chunk_is_mmapped (p)) { if (__builtin_expect (perturb_byte, 0)) - return memset (mem, 0, sz); + memset (mem, 0, sz); - return mem; + goto out; } #if MORECORE_CLEARS @@ -3677,7 +3718,10 @@ __libc_calloc (size_t n, size_t elem_size) assert (nclears >= 3); if (nclears > 9) - return memset (d, 0, clearsize); + { + memset (d, 0, clearsize); + goto out; + } else { @@ -3701,7 +3745,8 @@ __libc_calloc (size_t n, size_t elem_size) } } - return mem; +out: + return _calloc_debug_after (mem, bytes, RETURN_ADDRESS (0)); } /* diff --git a/malloc/mcheck-hooks.c b/malloc/mcheck-hooks.c new file mode 100644 index 0000000000..f3520c7659 --- /dev/null +++ b/malloc/mcheck-hooks.c @@ -0,0 +1,411 @@ +/* mcheck debugging hooks for malloc. + Copyright (C) 1990-2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Written May 1989 by Mike Haertel. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include + +/* Arbitrary magical numbers. */ +#define MAGICWORD 0xfedabeeb +#define MAGICFREE 0xd8675309 +#define MAGICBYTE ((char) 0xd7) +#define MALLOCFLOOD ((char) 0x93) +#define FREEFLOOD ((char) 0x95) + +/* Function to call when something awful happens. */ +static void (*abortfunc) (enum mcheck_status); + +struct hdr +{ + size_t size; /* Exact size requested by user. */ + unsigned long int magic; /* Magic number to check header integrity. */ + struct hdr *prev; + struct hdr *next; + void *block; /* Real block allocated, for memalign. */ + unsigned long int magic2; /* Extra, keeps us doubleword aligned. */ +}; + +/* This is the beginning of the list of all memory blocks allocated. + It is only constructed if the pedantic testing is requested. */ +struct hdr *__mcheck_root; + +/* Nonzero if pedentic checking of all blocks is requested. */ +static bool pedantic; + +#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34) +/* Flag to initialize mcheck on first malloc invocation through -lmcheck. + libmcheck.a overrides this with a strong symbol initialized to 1. The + symbol cannot be linked against directly during build. */ +const int __libc_lmcheck __attribute__ ((weak)); +compat_symbol (libc, __libc_lmcheck, __libc_lmcheck, GLIBC_2_34); +#endif + +#if defined _LIBC || defined STDC_HEADERS || defined USG +# include +# define flood memset +#else +static void flood (void *, int, size_t); +static void +flood (void *ptr, int val, size_t size) +{ + char *cp = ptr; + while (size--) + *cp++ = val; +} +#endif + +static enum mcheck_status +checkhdr (const struct hdr *hdr) +{ + enum mcheck_status status; + bool mcheck_used = __is_malloc_debug_enabled (MALLOC_MCHECK_HOOK); + + if (!mcheck_used) + /* Maybe the mcheck used is disabled? This happens when we find + an error and report it. */ + return MCHECK_OK; + + switch (hdr->magic ^ ((uintptr_t) hdr->prev + (uintptr_t) hdr->next)) + { + default: + status = MCHECK_HEAD; + break; + case MAGICFREE: + status = MCHECK_FREE; + break; + case MAGICWORD: + if (((char *) &hdr[1])[hdr->size] != MAGICBYTE) + status = MCHECK_TAIL; + else if ((hdr->magic2 ^ (uintptr_t) hdr->block) != MAGICWORD) + status = MCHECK_HEAD; + else + status = MCHECK_OK; + break; + } + if (status != MCHECK_OK) + { + mcheck_used = 0; + (*abortfunc) (status); + mcheck_used = 1; + } + return status; +} + +enum mcheck_status +__mcheck_checkptr (const void *ptr) +{ + if (!__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)) + return MCHECK_DISABLED; + + if (ptr != NULL) + return checkhdr (((struct hdr *) ptr) - 1); + + /* Walk through all the active blocks and test whether they were tampered + with. */ + struct hdr *runp = __mcheck_root; + + /* Temporarily turn off the checks. */ + pedantic = false; + + while (runp != NULL) + { + (void) checkhdr (runp); + + runp = runp->next; + } + + /* Turn checks on again. */ + pedantic = true; + + return MCHECK_OK; +} + +static void +unlink_blk (struct hdr *ptr) +{ + if (ptr->next != NULL) + { + ptr->next->prev = ptr->prev; + ptr->next->magic = MAGICWORD ^ ((uintptr_t) ptr->next->prev + + (uintptr_t) ptr->next->next); + } + if (ptr->prev != NULL) + { + ptr->prev->next = ptr->next; + ptr->prev->magic = MAGICWORD ^ ((uintptr_t) ptr->prev->prev + + (uintptr_t) ptr->prev->next); + } + else + __mcheck_root = ptr->next; +} + +static void +link_blk (struct hdr *hdr) +{ + hdr->prev = NULL; + hdr->next = __mcheck_root; + __mcheck_root = hdr; + hdr->magic = MAGICWORD ^ (uintptr_t) hdr->next; + + /* And the next block. */ + if (hdr->next != NULL) + { + hdr->next->prev = hdr; + hdr->next->magic = MAGICWORD ^ ((uintptr_t) hdr + + (uintptr_t) hdr->next->next); + } +} + +static void * +free_mcheck (void *ptr) +{ + if (pedantic) + __mcheck_checkptr (NULL); + if (ptr) + { + struct hdr *hdr = ((struct hdr *) ptr) - 1; + checkhdr (hdr); + hdr->magic = MAGICFREE; + hdr->magic2 = MAGICFREE; + unlink_blk (hdr); + hdr->prev = hdr->next = NULL; + flood (ptr, FREEFLOOD, hdr->size); + ptr = hdr->block; + } + return ptr; +} + +static bool +malloc_mcheck_before (size_t *sizep, void **victimp) +{ + size_t size = *sizep; + + if (pedantic) + __mcheck_checkptr (NULL); + + if (size > ~((size_t) 0) - (sizeof (struct hdr) + 1)) + { + __set_errno (ENOMEM); + *victimp = NULL; + return true; + } + + *sizep = sizeof (struct hdr) + size + 1; + return false; +} + +static void * +malloc_mcheck_after (void *mem, size_t size) +{ + struct hdr *hdr = mem; + + if (hdr == NULL) + return NULL; + + hdr->size = size; + link_blk (hdr); + hdr->block = hdr; + hdr->magic2 = (uintptr_t) hdr ^ MAGICWORD; + ((char *) &hdr[1])[size] = MAGICBYTE; + flood ((void *) (hdr + 1), MALLOCFLOOD, size); + return (void *) (hdr + 1); +} + +static bool +memalign_mcheck_before (size_t alignment, size_t *sizep, void **victimp) +{ + struct hdr *hdr; + size_t slop, size = *sizep; + + /* Punt to malloc to avoid double headers. */ + if (alignment <= MALLOC_ALIGNMENT) + { + *victimp = __libc_malloc (size); + return true; + } + + if (pedantic) + __mcheck_checkptr (NULL); + + slop = (sizeof *hdr + alignment - 1) & - alignment; + + if (size > ~((size_t) 0) - (slop + 1)) + { + __set_errno (ENOMEM); + *victimp = NULL; + return true; + } + + *sizep = slop + size + 1; + return false; +} + +static void * +memalign_mcheck_after (void *block, size_t alignment, size_t size) +{ + if (block == NULL) + return NULL; + + /* This was served by __libc_malloc, so return as is. */ + if (alignment <= MALLOC_ALIGNMENT) + return block; + + size_t slop = (sizeof (struct hdr) + alignment - 1) & - alignment; + struct hdr *hdr = ((struct hdr *) (block + slop)) - 1; + + hdr->size = size; + link_blk (hdr); + hdr->block = (void *) block; + hdr->magic2 = (uintptr_t) block ^ MAGICWORD; + ((char *) &hdr[1])[size] = MAGICBYTE; + flood ((void *) (hdr + 1), MALLOCFLOOD, size); + return (void *) (hdr + 1); +} + +static bool +realloc_mcheck_before (void **ptrp, size_t *sizep, size_t *oldsize, + void **victimp) +{ + size_t size = *sizep; + void *ptr = *ptrp; + + /* Handle special cases to avoid adding multiple headers. */ + if (size == 0) + { + __libc_free (ptr); + *victimp = NULL; + return true; + } + + if (ptr == NULL) + { + *victimp = __libc_malloc (size); + *oldsize = 0; + return true; + } + + if (size > ~((size_t) 0) - (sizeof (struct hdr) + 1)) + { + __set_errno (ENOMEM); + *victimp = NULL; + *oldsize = 0; + return true; + } + + if (pedantic) + __mcheck_checkptr (NULL); + + struct hdr *hdr; + size_t osize; + + /* Update the oldptr for glibc realloc. */ + *ptrp = hdr = ((struct hdr *) ptr) - 1; + + osize = hdr->size; + + checkhdr (hdr); + unlink_blk (hdr); + if (size < osize) + flood ((char *) ptr + size, FREEFLOOD, osize - size); + + *oldsize = osize; + *sizep = sizeof (struct hdr) + size + 1; + return false; +} + +static void * +realloc_mcheck_after (void *ptr, void *oldptr, size_t size, size_t osize) +{ + struct hdr *hdr = ptr; + + if (hdr == NULL) + return NULL; + + /* Malloc already added the header so don't tamper with it. */ + if (oldptr == NULL) + return ptr; + + hdr->size = size; + link_blk (hdr); + hdr->block = hdr; + hdr->magic2 = (uintptr_t) hdr ^ MAGICWORD; + ((char *) &hdr[1])[size] = MAGICBYTE; + if (size > osize) + flood ((char *) (hdr + 1) + osize, MALLOCFLOOD, size - osize); + return (void *) (hdr + 1); +} + +__attribute__ ((noreturn)) +static void +mabort (enum mcheck_status status) +{ + const char *msg; + switch (status) + { + case MCHECK_OK: + msg = _ ("memory is consistent, library is buggy\n"); + break; + case MCHECK_HEAD: + msg = _ ("memory clobbered before allocated block\n"); + break; + case MCHECK_TAIL: + msg = _ ("memory clobbered past end of allocated block\n"); + break; + case MCHECK_FREE: + msg = _ ("block freed twice\n"); + break; + default: + msg = _ ("bogus mcheck_status, library is buggy\n"); + break; + } +#ifdef _LIBC + __libc_fatal (msg); +#else + fprintf (stderr, "mcheck: %s", msg); + fflush (stderr); + abort (); +#endif +} + +int +__mcheck_initialize (void (*func) (enum mcheck_status), bool in_pedantic) +{ + abortfunc = (func != NULL) ? func : &mabort; + + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)) + goto out; + + switch (__malloc_initialized) + { + case -1: + ptmalloc_init (); + /* FALLTHROUGH */ + case 0: + __malloc_debug_enable (MALLOC_MCHECK_HOOK); + break; + default: + break; + } + + if (!__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)) + return -1; + +out: + pedantic = in_pedantic; + return 0; +} diff --git a/malloc/mcheck-init.c b/malloc/mcheck-init.c index 9ee69ee5f8..e3d08ae05f 100644 --- a/malloc/mcheck-init.c +++ b/malloc/mcheck-init.c @@ -17,17 +17,7 @@ /* The object of this file should be installed as libmcheck.a, so one can do -lmcheck to turn on mcheck. */ - -#include -#include #include -static void -turn_on_mcheck (void) -{ - mcheck (NULL); -} - -void (*__malloc_initialize_hook) (void) = turn_on_mcheck; -compat_symbol_reference (libc, __malloc_initialize_hook, - __malloc_initialize_hook, GLIBC_2_0); +const int __libc_lmcheck = 1; +compat_symbol_reference (libc, __libc_lmcheck, __libc_lmcheck, GLIBC_2_34); diff --git a/malloc/mcheck.c b/malloc/mcheck.c index 2a1fc645d4..f60766eded 100644 --- a/malloc/mcheck.c +++ b/malloc/mcheck.c @@ -1,4 +1,4 @@ -/* Standard debugging hooks for `malloc'. +/* The mcheck() interface. Copyright (C) 1990-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. Written May 1989 by Mike Haertel. @@ -23,378 +23,22 @@ # include # include # include -# include # include #endif -/* Old hook values. */ -static void (*old_free_hook)(void *ptr, const void *); -static void *(*old_malloc_hook) (size_t size, const void *); -static void *(*old_memalign_hook) (size_t alignment, size_t size, - const void *); -static void *(*old_realloc_hook) (void *ptr, size_t size, - const void *); - -/* Function to call when something awful happens. */ -static void (*abortfunc) (enum mcheck_status); - -/* Arbitrary magical numbers. */ -#define MAGICWORD 0xfedabeeb -#define MAGICFREE 0xd8675309 -#define MAGICBYTE ((char) 0xd7) -#define MALLOCFLOOD ((char) 0x93) -#define FREEFLOOD ((char) 0x95) - -struct hdr -{ - size_t size; /* Exact size requested by user. */ - unsigned long int magic; /* Magic number to check header integrity. */ - struct hdr *prev; - struct hdr *next; - void *block; /* Real block allocated, for memalign. */ - unsigned long int magic2; /* Extra, keeps us doubleword aligned. */ -}; - -/* This is the beginning of the list of all memory blocks allocated. - It is only constructed if the pedantic testing is requested. */ -static struct hdr *root; - -static int mcheck_used; - -/* Nonzero if pedentic checking of all blocks is requested. */ -static int pedantic; - -#if defined _LIBC || defined STDC_HEADERS || defined USG -# include -# define flood memset -#else -static void flood (void *, int, size_t); -static void -flood (void *ptr, int val, size_t size) -{ - char *cp = ptr; - while (size--) - *cp++ = val; -} -#endif - -static enum mcheck_status -checkhdr (const struct hdr *hdr) -{ - enum mcheck_status status; - - if (!mcheck_used) - /* Maybe the mcheck used is disabled? This happens when we find - an error and report it. */ - return MCHECK_OK; - - switch (hdr->magic ^ ((uintptr_t) hdr->prev + (uintptr_t) hdr->next)) - { - default: - status = MCHECK_HEAD; - break; - case MAGICFREE: - status = MCHECK_FREE; - break; - case MAGICWORD: - if (((char *) &hdr[1])[hdr->size] != MAGICBYTE) - status = MCHECK_TAIL; - else if ((hdr->magic2 ^ (uintptr_t) hdr->block) != MAGICWORD) - status = MCHECK_HEAD; - else - status = MCHECK_OK; - break; - } - if (status != MCHECK_OK) - { - mcheck_used = 0; - (*abortfunc) (status); - mcheck_used = 1; - } - return status; -} - void mcheck_check_all (void) { - /* Walk through all the active blocks and test whether they were tampered - with. */ - struct hdr *runp = root; - - /* Temporarily turn off the checks. */ - pedantic = 0; - - while (runp != NULL) - { - (void) checkhdr (runp); - - runp = runp->next; - } - - /* Turn checks on again. */ - pedantic = 1; + __mcheck_checkptr (NULL); } #ifdef _LIBC libc_hidden_def (mcheck_check_all) #endif -static void -unlink_blk (struct hdr *ptr) -{ - if (ptr->next != NULL) - { - ptr->next->prev = ptr->prev; - ptr->next->magic = MAGICWORD ^ ((uintptr_t) ptr->next->prev - + (uintptr_t) ptr->next->next); - } - if (ptr->prev != NULL) - { - ptr->prev->next = ptr->next; - ptr->prev->magic = MAGICWORD ^ ((uintptr_t) ptr->prev->prev - + (uintptr_t) ptr->prev->next); - } - else - root = ptr->next; -} - -static void -link_blk (struct hdr *hdr) -{ - hdr->prev = NULL; - hdr->next = root; - root = hdr; - hdr->magic = MAGICWORD ^ (uintptr_t) hdr->next; - - /* And the next block. */ - if (hdr->next != NULL) - { - hdr->next->prev = hdr; - hdr->next->magic = MAGICWORD ^ ((uintptr_t) hdr - + (uintptr_t) hdr->next->next); - } -} -static void -freehook (void *ptr, const void *caller) -{ - if (pedantic) - mcheck_check_all (); - if (ptr) - { - struct hdr *hdr = ((struct hdr *) ptr) - 1; - checkhdr (hdr); - hdr->magic = MAGICFREE; - hdr->magic2 = MAGICFREE; - unlink_blk (hdr); - hdr->prev = hdr->next = NULL; - flood (ptr, FREEFLOOD, hdr->size); - ptr = hdr->block; - } - __free_hook = old_free_hook; - if (old_free_hook != NULL) - (*old_free_hook)(ptr, caller); - else - free (ptr); - __free_hook = freehook; -} - -static void * -mallochook (size_t size, const void *caller) -{ - struct hdr *hdr; - - if (pedantic) - mcheck_check_all (); - - if (size > ~((size_t) 0) - (sizeof (struct hdr) + 1)) - { - __set_errno (ENOMEM); - return NULL; - } - - __malloc_hook = old_malloc_hook; - if (old_malloc_hook != NULL) - hdr = (struct hdr *) (*old_malloc_hook)(sizeof (struct hdr) + size + 1, - caller); - else - hdr = (struct hdr *) malloc (sizeof (struct hdr) + size + 1); - __malloc_hook = mallochook; - if (hdr == NULL) - return NULL; - - hdr->size = size; - link_blk (hdr); - hdr->block = hdr; - hdr->magic2 = (uintptr_t) hdr ^ MAGICWORD; - ((char *) &hdr[1])[size] = MAGICBYTE; - flood ((void *) (hdr + 1), MALLOCFLOOD, size); - return (void *) (hdr + 1); -} - -static void * -memalignhook (size_t alignment, size_t size, - const void *caller) -{ - struct hdr *hdr; - size_t slop; - char *block; - - if (pedantic) - mcheck_check_all (); - - slop = (sizeof *hdr + alignment - 1) & - alignment; - - if (size > ~((size_t) 0) - (slop + 1)) - { - __set_errno (ENOMEM); - return NULL; - } - - __memalign_hook = old_memalign_hook; - if (old_memalign_hook != NULL) - block = (*old_memalign_hook)(alignment, slop + size + 1, caller); - else - block = memalign (alignment, slop + size + 1); - __memalign_hook = memalignhook; - if (block == NULL) - return NULL; - - hdr = ((struct hdr *) (block + slop)) - 1; - - hdr->size = size; - link_blk (hdr); - hdr->block = (void *) block; - hdr->magic2 = (uintptr_t) block ^ MAGICWORD; - ((char *) &hdr[1])[size] = MAGICBYTE; - flood ((void *) (hdr + 1), MALLOCFLOOD, size); - return (void *) (hdr + 1); -} - -static void * -reallochook (void *ptr, size_t size, const void *caller) -{ - if (size == 0) - { - freehook (ptr, caller); - return NULL; - } - - struct hdr *hdr; - size_t osize; - - if (pedantic) - mcheck_check_all (); - - if (size > ~((size_t) 0) - (sizeof (struct hdr) + 1)) - { - __set_errno (ENOMEM); - return NULL; - } - - if (ptr) - { - hdr = ((struct hdr *) ptr) - 1; - osize = hdr->size; - - checkhdr (hdr); - unlink_blk (hdr); - if (size < osize) - flood ((char *) ptr + size, FREEFLOOD, osize - size); - } - else - { - osize = 0; - hdr = NULL; - } - __free_hook = old_free_hook; - __malloc_hook = old_malloc_hook; - __memalign_hook = old_memalign_hook; - __realloc_hook = old_realloc_hook; - if (old_realloc_hook != NULL) - hdr = (struct hdr *) (*old_realloc_hook)((void *) hdr, - sizeof (struct hdr) + size + 1, - caller); - else - hdr = (struct hdr *) realloc ((void *) hdr, - sizeof (struct hdr) + size + 1); - __free_hook = freehook; - __malloc_hook = mallochook; - __memalign_hook = memalignhook; - __realloc_hook = reallochook; - if (hdr == NULL) - return NULL; - - hdr->size = size; - link_blk (hdr); - hdr->block = hdr; - hdr->magic2 = (uintptr_t) hdr ^ MAGICWORD; - ((char *) &hdr[1])[size] = MAGICBYTE; - if (size > osize) - flood ((char *) (hdr + 1) + osize, MALLOCFLOOD, size - osize); - return (void *) (hdr + 1); -} - -__attribute__ ((noreturn)) -static void -mabort (enum mcheck_status status) -{ - const char *msg; - switch (status) - { - case MCHECK_OK: - msg = _ ("memory is consistent, library is buggy\n"); - break; - case MCHECK_HEAD: - msg = _ ("memory clobbered before allocated block\n"); - break; - case MCHECK_TAIL: - msg = _ ("memory clobbered past end of allocated block\n"); - break; - case MCHECK_FREE: - msg = _ ("block freed twice\n"); - break; - default: - msg = _ ("bogus mcheck_status, library is buggy\n"); - break; - } -#ifdef _LIBC - __libc_fatal (msg); -#else - fprintf (stderr, "mcheck: %s", msg); - fflush (stderr); - abort (); -#endif -} - -/* Memory barrier so that GCC does not optimize out the argument. */ -#define malloc_opt_barrier(x) \ - ({ __typeof (x) __x = x; __asm ("" : "+m" (__x)); __x; }) - int mcheck (void (*func) (enum mcheck_status)) { - abortfunc = (func != NULL) ? func : &mabort; - - /* These hooks may not be safely inserted if malloc is already in use. */ - if (__malloc_initialized <= 0 && !mcheck_used) - { - /* We call malloc() once here to ensure it is initialized. */ - void *p = malloc (0); - /* GCC might optimize out the malloc/free pair without a barrier. */ - p = malloc_opt_barrier (p); - free (p); - - old_free_hook = __free_hook; - __free_hook = freehook; - old_malloc_hook = __malloc_hook; - __malloc_hook = mallochook; - old_memalign_hook = __memalign_hook; - __memalign_hook = memalignhook; - old_realloc_hook = __realloc_hook; - __realloc_hook = reallochook; - mcheck_used = 1; - } - - return mcheck_used ? 0 : -1; + return __mcheck_initialize (func, false); } #ifdef _LIBC libc_hidden_def (mcheck) @@ -403,14 +47,11 @@ libc_hidden_def (mcheck) int mcheck_pedantic (void (*func) (enum mcheck_status)) { - int res = mcheck (func); - if (res == 0) - pedantic = 1; - return res; + return __mcheck_initialize (func, true); } enum mcheck_status mprobe (void *ptr) { - return mcheck_used ? checkhdr (((struct hdr *) ptr) - 1) : MCHECK_DISABLED; + return __mcheck_checkptr (ptr); } diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist index c3232ba32e..aaf9327015 100644 --- a/sysdeps/mach/hurd/i386/libc.abilist +++ b/sysdeps/mach/hurd/i386/libc.abilist @@ -2216,6 +2216,7 @@ GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.34 __isnanf128 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 _hurd_libc_proc_init F GLIBC_2.34 dladdr F diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index 42e240e284..fa3b7ec645 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2336,6 +2336,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index fad54555dc..069767561d 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -2429,6 +2429,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist index 907716ec39..88340442d5 100644 --- a/sysdeps/unix/sysv/linux/arc/libc.abilist +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist @@ -2095,6 +2095,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist index 50f987a429..4164fef788 100644 --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist @@ -219,6 +219,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index bf9038af84..4de7bba9bc 100644 --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist @@ -216,6 +216,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist index afb91f6f43..80b70542f1 100644 --- a/sysdeps/unix/sysv/linux/csky/libc.abilist +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist @@ -2308,6 +2308,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index 125f8a269a..dfce047c08 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -2262,6 +2262,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index 517753bdd1..778392d7d1 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -2446,6 +2446,7 @@ GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F GLIBC_2.34 __isnanf128 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist index 23d0928360..6657a9377a 100644 --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist @@ -2269,6 +2269,7 @@ GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.34 __isnanf128 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index dd5fb50b18..50e975ec5c 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist @@ -220,6 +220,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index cb1d553361..b4b78fb34e 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -2389,6 +2389,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist index 6a20a6fdf2..54f7e8fbfa 100644 --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist @@ -2359,6 +2359,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist index 4c21cbb64d..81f1d89b1f 100644 --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist @@ -2356,6 +2356,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index f83ba2f780..0956d06b3a 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -2354,6 +2354,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist index 347bbddb94..1a03772097 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist @@ -2352,6 +2352,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index 26b7ab529b..244154cc78 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -2360,6 +2360,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index e667b0e553..0b26070aad 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -2325,6 +2325,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index 89a1cc7da6..c4742882b9 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2398,6 +2398,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index f364c5219e..27ece00eb4 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -2416,6 +2416,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index f5bcc78afe..c4cf0ffeb4 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist @@ -2449,6 +2449,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist index 6032716053..a10c7b5f10 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist @@ -2233,6 +2233,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist index 8c5494e1dc..72a6ef2c1f 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist @@ -2532,6 +2532,7 @@ GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.34 __isnanf128 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index d7db279c1e..98ee166273 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -2097,6 +2097,7 @@ GLIBC_2.33 wprintf F GLIBC_2.33 write F GLIBC_2.33 writev F GLIBC_2.33 wscanf F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index ef03dc0f9e..ba5be3403a 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2297,6 +2297,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index 9118cb68ec..69a3dab8bc 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -2414,6 +2414,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index 66c01bd7e7..1cc22e808a 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -2270,6 +2270,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist index c40eb412c2..349794da3c 100644 --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist @@ -2269,6 +2269,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist index 1412d33835..0fb54b1a62 100644 --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist @@ -2266,6 +2266,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index 7b55d34753..b2381d0717 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -2407,6 +2407,7 @@ GLIBC_2.34 __glob64_time64 F GLIBC_2.34 __globfree64_time64 F GLIBC_2.34 __gmtime64 F GLIBC_2.34 __gmtime64_r F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __localtime64 F GLIBC_2.34 __localtime64_r F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index cfd5f38864..b8bfd0a7fc 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -2290,6 +2290,7 @@ GLIBC_2.33 mknod F GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index 17be05f14f..793b73440d 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -2248,6 +2248,7 @@ GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.34 __isnanf128 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index a9db18906b..1e7ff371d8 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2351,6 +2351,7 @@ GLIBC_2.33 mknodat F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.34 __isnanf128 F +GLIBC_2.34 __libc_lmcheck D 0x4 GLIBC_2.34 __libc_start_main F GLIBC_2.34 __pthread_cleanup_routine F GLIBC_2.34 __pthread_key_create F From patchwork Thu Jun 24 18:23:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 44004 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 1335539B042A for ; Thu, 24 Jun 2021 18:27:03 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1335539B042A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624559223; bh=017v2sGc8opB9zGCGgwdkjUYbsg4O9T389pnZbQeZzs=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=qEfqESx2awkgLQSz/Ym4OgMwwS+n/tXszmTP+LnZToE2hY6gGulIRp7EIsTYw14CH 7ApKrNwMIfl4PfjB/2pJPEcdaBJBnd9s4r3Yck8j5wcNcdcaZ95BgtNlvT3s5pzsBi ugjs/lSawMYnzKniRFSgr4O8oowRYzGeByPvcdK0= 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ECDHE-RSA-AES256-GCM-SHA384) by 100.96.17.75 (trex/6.3.3); Thu, 24 Jun 2021 18:23:49 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|siddhesh@gotplt.org X-MailChannels-Auth-Id: dreamhost X-Interest-Turn: 3d015a5c762d8fee_1624559028976_2512504793 X-MC-Loop-Signature: 1624559028976:2378021965 X-MC-Ingress-Time: 1624559028976 Received: from pdx1-sub0-mail-a66.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTP id 556718DD5F; Thu, 24 Jun 2021 11:23:48 -0700 (PDT) Received: from rhbox.intra.reserved-bit.com (unknown [1.186.101.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTPSA id 4DC028DD5D; Thu, 24 Jun 2021 11:23:45 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a66 To: libc-alpha@sourceware.org Subject: [PATCH 5/8] mtrace: Wean away from malloc hooks Date: Thu, 24 Jun 2021 23:53:09 +0530 Message-Id: <20210624182312.236596-6-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624182312.236596-1-siddhesh@sourceware.org> References: <20210624182312.236596-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-3493.8 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NEUTRAL, TXREP, URIBL_BLACK autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Split mtrace hooks into before and after and adapt to the new internal debugging hooks infrastructure. With this, the malloc hooks are unused internally and can be removed from the main library. This also eliminates the only use of memalign through a PLT in the library, so checklocalplt data needs to be updated to reflect that. --- include/malloc.h | 1 + malloc/hooks.c | 38 ++- malloc/mtrace-hooks.c | 137 ++++++++++ malloc/mtrace.c | 233 +----------------- sysdeps/generic/localplt.data | 1 - sysdeps/mach/hurd/i386/localplt.data | 1 - sysdeps/unix/sysv/linux/aarch64/localplt.data | 1 - sysdeps/unix/sysv/linux/alpha/localplt.data | 1 - sysdeps/unix/sysv/linux/arc/localplt.data | 1 - sysdeps/unix/sysv/linux/arm/localplt.data | 1 - sysdeps/unix/sysv/linux/csky/localplt.data | 1 - sysdeps/unix/sysv/linux/hppa/localplt.data | 1 - sysdeps/unix/sysv/linux/i386/localplt.data | 1 - sysdeps/unix/sysv/linux/ia64/localplt.data | 1 - .../sysv/linux/m68k/coldfire/localplt.data | 1 - .../unix/sysv/linux/m68k/m680x0/localplt.data | 1 - .../unix/sysv/linux/microblaze/localplt.data | 1 - sysdeps/unix/sysv/linux/nios2/localplt.data | 1 - .../linux/powerpc/powerpc32/fpu/localplt.data | 1 - .../powerpc/powerpc32/nofpu/localplt.data | 1 - .../linux/powerpc/powerpc64/localplt.data | 1 - sysdeps/unix/sysv/linux/riscv/localplt.data | 1 - sysdeps/unix/sysv/linux/s390/localplt.data | 1 - sysdeps/unix/sysv/linux/sh/localplt.data | 1 - .../sysv/linux/sparc/sparc32/localplt.data | 1 - .../sysv/linux/sparc/sparc64/localplt.data | 1 - sysdeps/x86_64/localplt.data | 1 - 27 files changed, 180 insertions(+), 252 deletions(-) create mode 100644 malloc/mtrace-hooks.c diff --git a/include/malloc.h b/include/malloc.h index bb1123d9d3..6169d486f5 100644 --- a/include/malloc.h +++ b/include/malloc.h @@ -15,6 +15,7 @@ typedef struct malloc_state *mstate; #define __malloc_initialized __libc_malloc_initialized /* Nonzero if the malloc is already initialized. */ extern int __malloc_initialized attribute_hidden; +extern FILE *__mtrace_mallstream attribute_hidden; enum mcheck_status __mcheck_checkptr (const void *) attribute_hidden; extern int __mcheck_initialize (void (*) (enum mcheck_status), bool) diff --git a/malloc/hooks.c b/malloc/hooks.c index b517a98ea2..492e9aac63 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -37,6 +37,7 @@ enum malloc_debug_hooks MALLOC_NONE_HOOK = 0, MALLOC_CHECK_HOOK = 1 << 0, /* MALLOC_CHECK_ or glibc.malloc.check. */ MALLOC_MCHECK_HOOK = 1 << 1, /* mcheck() */ + MALLOC_MTRACE_HOOK = 1 << 2, /* mtrace() */ }; static unsigned __malloc_debugging_hooks; @@ -79,6 +80,7 @@ __malloc_debug_disable (enum malloc_debug_hooks flag) #include "malloc-check.c" #include "mcheck-hooks.c" +#include "mtrace-hooks.c" static __always_inline bool _malloc_debug_before (size_t *bytesp, void **victimp, const void *address) @@ -111,8 +113,13 @@ _malloc_debug_before (size_t *bytesp, void **victimp, const void *address) static __always_inline void * _malloc_debug_after (void *mem, size_t bytes, const void *address) { - if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) - mem = malloc_mcheck_after (mem, bytes); + if (__glibc_unlikely (__malloc_debugging_hooks)) + { + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) + mem = malloc_mcheck_after (mem, bytes); + if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK)) + mem = malloc_mtrace_after (mem, bytes, address); + } return mem; } @@ -129,6 +136,8 @@ _free_debug_before (void **mem, const void *address) if (__glibc_unlikely (__malloc_debugging_hooks)) { + if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK)) + free_mtrace (mem, address); if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)) *mem = free_mcheck (*mem); if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)) @@ -171,8 +180,13 @@ static __always_inline void * _realloc_debug_after (void *mem, void *oldmem, size_t bytes, size_t oldsize, const void *address) { - if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) - mem = realloc_mcheck_after (mem, oldmem, bytes, oldsize); + if (__glibc_unlikely (__malloc_debugging_hooks)) + { + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) + mem = realloc_mcheck_after (mem, oldmem, bytes, oldsize); + if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK)) + mem = realloc_mtrace_after (mem, oldmem, bytes, address); + } return mem; } @@ -206,8 +220,13 @@ static __always_inline void * _memalign_debug_after (void *mem, size_t alignment, size_t bytes, const void *address) { - if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) - mem = memalign_mcheck_after (mem, alignment, bytes); + if (__glibc_unlikely (__malloc_debugging_hooks)) + { + if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL) + mem = memalign_mcheck_after (mem, alignment, bytes); + if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK)) + mem = memalign_mtrace_after (mem, bytes, address); + } return mem; } @@ -243,11 +262,14 @@ _calloc_debug_before (size_t *bytesp, void **victimp, const void *address) static __always_inline void * _calloc_debug_after (void *mem, size_t bytes, const void *address) { - if (__glibc_unlikely (__malloc_debugging_hooks) && mem != NULL) + if (__glibc_unlikely (__malloc_debugging_hooks)) { if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)) mem = malloc_mcheck_after (mem, bytes); - memset (mem, 0, bytes); + if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK)) + mem = malloc_mtrace_after (mem, bytes, address); + else if (mem != NULL) + memset (mem, 0, bytes); } return mem; } diff --git a/malloc/mtrace-hooks.c b/malloc/mtrace-hooks.c new file mode 100644 index 0000000000..c1c6d6a6e9 --- /dev/null +++ b/malloc/mtrace-hooks.c @@ -0,0 +1,137 @@ + +# include + +#include + +FILE *__mtrace_mallstream; + +__libc_lock_define_initialized (static, lock); + +static void +tr_where (const void *caller, Dl_info *info) +{ + if (caller != NULL) + { + if (info != NULL) + { + char *buf = (char *) ""; + if (info->dli_sname != NULL) + { + size_t len = strlen (info->dli_sname); + buf = alloca (len + 6 + 2 * sizeof (void *)); + + buf[0] = '('; + __stpcpy (_fitoa (caller >= (const void *) info->dli_saddr + ? caller - (const void *) info->dli_saddr + : (const void *) info->dli_saddr - caller, + __stpcpy (__mempcpy (buf + 1, info->dli_sname, + len), + caller >= (void *) info->dli_saddr + ? "+0x" : "-0x"), + 16, 0), + ")"); + } + + fprintf (__mtrace_mallstream, "@ %s%s%s[%p] ", + info->dli_fname ? : "", info->dli_fname ? ":" : "", + buf, caller); + } + else + fprintf (__mtrace_mallstream, "@ [%p] ", caller); + } +} + +static Dl_info * +lock_and_info (const void *caller, Dl_info *mem) +{ + if (caller == NULL) + return NULL; + + Dl_info *res = _dl_addr (caller, mem, NULL, NULL) ? mem : NULL; + + __libc_lock_lock (lock); + + return res; +} + +static bool +free_mtrace (void *ptr, const void *caller) +{ + if (ptr == NULL) + return true; + + Dl_info mem; + Dl_info *info = lock_and_info (caller, &mem); + tr_where (caller, info); + /* Be sure to print it first. */ + fprintf (__mtrace_mallstream, "- %p\n", ptr); + __libc_lock_unlock (lock); + + /* Continue on to free. */ + return false; +} + +static void * +malloc_mtrace_after (void *block, size_t size, const void *caller) +{ + Dl_info mem; + Dl_info *info = lock_and_info (caller, &mem); + + tr_where (caller, info); + /* We could be printing a NULL here; that's OK. */ + fprintf (__mtrace_mallstream, "+ %p %#lx\n", block, + (unsigned long int) size); + + __libc_lock_unlock (lock); + + return block; +} + +static void * +realloc_mtrace_after (void *block, const void *oldptr, size_t size, + const void *caller) +{ + Dl_info mem; + Dl_info *info = lock_and_info (caller, &mem); + + tr_where (caller, info); + if (block == NULL) + { + if (size != 0) + /* Failed realloc. */ + fprintf (__mtrace_mallstream, "! %p %#lx\n", oldptr, + (unsigned long int) size); + else + fprintf (__mtrace_mallstream, "- %p\n", oldptr); + } + else if (oldptr == NULL) + fprintf (__mtrace_mallstream, "+ %p %#lx\n", block, + (unsigned long int) size); + else + { + fprintf (__mtrace_mallstream, "< %p\n", oldptr); + tr_where (caller, info); + fprintf (__mtrace_mallstream, "> %p %#lx\n", block, + (unsigned long int) size); + } + + __libc_lock_unlock (lock); + + return block; +} + +static void * +memalign_mtrace_after (void *block, size_t size, const void *caller) +{ + Dl_info mem; + Dl_info *info = lock_and_info (caller, &mem); + + tr_where (caller, info); + /* We could be printing a NULL here; that's OK. */ + fprintf (__mtrace_mallstream, "+ %p %#lx\n", block, + (unsigned long int) size); + + __libc_lock_unlock (lock); + + return block; +} diff --git a/malloc/mtrace.c b/malloc/mtrace.c index 6c2c58b706..2cc4507e25 100644 --- a/malloc/mtrace.c +++ b/malloc/mtrace.c @@ -22,7 +22,6 @@ # define _MALLOC_INTERNAL # include # include -# include #endif #include @@ -35,20 +34,14 @@ #include #include - #include #define setvbuf(s, b, f, l) _IO_setvbuf (s, b, f, l) #define fwrite(buf, size, count, fp) _IO_fwrite (buf, size, count, fp) -#include - #define TRACE_BUFFER_SIZE 512 -static FILE *mallstream; -static const char mallenv[] = "MALLOC_TRACE"; static char *malloc_trace_buffer; - -__libc_lock_define_initialized (static, lock); +static const char mallenv[] = "MALLOC_TRACE"; #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34) /* Compatibility symbols that were introduced to help break at allocation sites @@ -69,204 +62,6 @@ tr_break (void) compat_symbol (libc, tr_break, tr_break, GLIBC_2_0); #endif - -/* Old hook values. */ -static void (*tr_old_free_hook) (void *ptr, const void *); -static void *(*tr_old_malloc_hook) (size_t size, const void *); -static void *(*tr_old_realloc_hook) (void *ptr, size_t size, - const void *); -static void *(*tr_old_memalign_hook) (size_t __alignment, size_t __size, - const void *); - -static void -tr_where (const void *caller, Dl_info *info) -{ - if (caller != NULL) - { - if (info != NULL) - { - char *buf = (char *) ""; - if (info->dli_sname != NULL) - { - size_t len = strlen (info->dli_sname); - buf = alloca (len + 6 + 2 * sizeof (void *)); - - buf[0] = '('; - __stpcpy (_fitoa (caller >= (const void *) info->dli_saddr - ? caller - (const void *) info->dli_saddr - : (const void *) info->dli_saddr - caller, - __stpcpy (__mempcpy (buf + 1, info->dli_sname, - len), - caller >= (void *) info->dli_saddr - ? "+0x" : "-0x"), - 16, 0), - ")"); - } - - fprintf (mallstream, "@ %s%s%s[%p] ", - info->dli_fname ? : "", info->dli_fname ? ":" : "", - buf, caller); - } - else - fprintf (mallstream, "@ [%p] ", caller); - } -} - -static Dl_info * -lock_and_info (const void *caller, Dl_info *mem) -{ - if (caller == NULL) - return NULL; - - Dl_info *res = _dl_addr (caller, mem, NULL, NULL) ? mem : NULL; - - __libc_lock_lock (lock); - - return res; -} - -static void tr_freehook (void *, const void *); -static void * tr_mallochook (size_t, const void *); -static void * tr_reallochook (void *, size_t, const void *); -static void * tr_memalignhook (size_t, size_t, const void *); - -/* Set all the default non-trace hooks. */ -static __always_inline void -set_default_hooks (void) -{ - __free_hook = tr_old_free_hook; - __malloc_hook = tr_old_malloc_hook; - __realloc_hook = tr_old_realloc_hook; - __memalign_hook = tr_old_memalign_hook; -} - -/* Set all of the tracing hooks used for mtrace. */ -static __always_inline void -set_trace_hooks (void) -{ - __free_hook = tr_freehook; - __malloc_hook = tr_mallochook; - __realloc_hook = tr_reallochook; - __memalign_hook = tr_memalignhook; -} - -/* Save the current set of hooks as the default hooks. */ -static __always_inline void -save_default_hooks (void) -{ - tr_old_free_hook = __free_hook; - tr_old_malloc_hook = __malloc_hook; - tr_old_realloc_hook = __realloc_hook; - tr_old_memalign_hook = __memalign_hook; -} - -static void -tr_freehook (void *ptr, const void *caller) -{ - if (ptr == NULL) - return; - - Dl_info mem; - Dl_info *info = lock_and_info (caller, &mem); - tr_where (caller, info); - /* Be sure to print it first. */ - fprintf (mallstream, "- %p\n", ptr); - set_default_hooks (); - if (tr_old_free_hook != NULL) - (*tr_old_free_hook)(ptr, caller); - else - free (ptr); - set_trace_hooks (); - __libc_lock_unlock (lock); -} - -static void * -tr_mallochook (size_t size, const void *caller) -{ - void *hdr; - - Dl_info mem; - Dl_info *info = lock_and_info (caller, &mem); - - set_default_hooks (); - if (tr_old_malloc_hook != NULL) - hdr = (void *) (*tr_old_malloc_hook)(size, caller); - else - hdr = (void *) malloc (size); - set_trace_hooks (); - - tr_where (caller, info); - /* We could be printing a NULL here; that's OK. */ - fprintf (mallstream, "+ %p %#lx\n", hdr, (unsigned long int) size); - - __libc_lock_unlock (lock); - - return hdr; -} - -static void * -tr_reallochook (void *ptr, size_t size, const void *caller) -{ - void *hdr; - - Dl_info mem; - Dl_info *info = lock_and_info (caller, &mem); - - set_default_hooks (); - if (tr_old_realloc_hook != NULL) - hdr = (void *) (*tr_old_realloc_hook)(ptr, size, caller); - else - hdr = (void *) realloc (ptr, size); - set_trace_hooks (); - - tr_where (caller, info); - if (hdr == NULL) - { - if (size != 0) - /* Failed realloc. */ - fprintf (mallstream, "! %p %#lx\n", ptr, (unsigned long int) size); - else - fprintf (mallstream, "- %p\n", ptr); - } - else if (ptr == NULL) - fprintf (mallstream, "+ %p %#lx\n", hdr, (unsigned long int) size); - else - { - fprintf (mallstream, "< %p\n", ptr); - tr_where (caller, info); - fprintf (mallstream, "> %p %#lx\n", hdr, (unsigned long int) size); - } - - __libc_lock_unlock (lock); - - return hdr; -} - -static void * -tr_memalignhook (size_t alignment, size_t size, const void *caller) -{ - void *hdr; - - Dl_info mem; - Dl_info *info = lock_and_info (caller, &mem); - - set_default_hooks (); - if (tr_old_memalign_hook != NULL) - hdr = (void *) (*tr_old_memalign_hook)(alignment, size, caller); - else - hdr = (void *) memalign (alignment, size); - set_trace_hooks (); - - tr_where (caller, info); - /* We could be printing a NULL here; that's OK. */ - fprintf (mallstream, "+ %p %#lx\n", hdr, (unsigned long int) size); - - __libc_lock_unlock (lock); - - return hdr; -} - - #ifdef _LIBC /* This function gets called to make sure all memory the library @@ -276,7 +71,7 @@ static void __libc_freeres_fn_section release_libc_mem (void) { /* Only call the free function if we still are running in mtrace mode. */ - if (mallstream != NULL) + if (__mtrace_mallstream != NULL) __libc_freeres (); } #endif @@ -293,7 +88,7 @@ mtrace (void) char *mallfile; /* Don't panic if we're called more than once. */ - if (mallstream != NULL) + if (__mtrace_mallstream != NULL) return; #ifdef _LIBC @@ -310,15 +105,15 @@ mtrace (void) if (mtb == NULL) return; - mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "wce"); - if (mallstream != NULL) + __mtrace_mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", + "wce"); + if (__mtrace_mallstream != NULL) { /* Be sure it doesn't malloc its buffer! */ malloc_trace_buffer = mtb; - setvbuf (mallstream, malloc_trace_buffer, _IOFBF, TRACE_BUFFER_SIZE); - fprintf (mallstream, "= Start\n"); - save_default_hooks (); - set_trace_hooks (); + setvbuf (__mtrace_mallstream, malloc_trace_buffer, _IOFBF, + TRACE_BUFFER_SIZE); + fprintf (__mtrace_mallstream, "= Start\n"); #ifdef _LIBC if (!added_atexit_handler) { @@ -336,15 +131,11 @@ mtrace (void) void muntrace (void) { - if (mallstream == NULL) + if (__mtrace_mallstream == NULL) return; - /* Do the reverse of what done in mtrace: first reset the hooks and - MALLSTREAM, and only after that write the trailer and close the - file. */ - FILE *f = mallstream; - mallstream = NULL; - set_default_hooks (); + FILE *f = __mtrace_mallstream; + __mtrace_mallstream = NULL; fprintf (f, "= End\n"); fclose (f); diff --git a/sysdeps/generic/localplt.data b/sysdeps/generic/localplt.data index e2083c0ce6..9b4f35786a 100644 --- a/sysdeps/generic/localplt.data +++ b/sysdeps/generic/localplt.data @@ -4,7 +4,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/mach/hurd/i386/localplt.data b/sysdeps/mach/hurd/i386/localplt.data index 94064ecbc5..47fbe1e2a7 100644 --- a/sysdeps/mach/hurd/i386/localplt.data +++ b/sysdeps/mach/hurd/i386/localplt.data @@ -6,7 +6,6 @@ libc.so: calloc + REL R_386_GLOB_DAT libc.so: free + REL R_386_GLOB_DAT libc.so: malloc + REL R_386_GLOB_DAT -libc.so: memalign + REL R_386_GLOB_DAT libc.so: realloc + REL R_386_GLOB_DAT libm.so: matherr + REL R_386_GLOB_DAT # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/aarch64/localplt.data b/sysdeps/unix/sysv/linux/aarch64/localplt.data index 2c14b652ef..348b3f3793 100644 --- a/sysdeps/unix/sysv/linux/aarch64/localplt.data +++ b/sysdeps/unix/sysv/linux/aarch64/localplt.data @@ -4,7 +4,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # If outline atomics are used, libgcc (built outside of glibc) may diff --git a/sysdeps/unix/sysv/linux/alpha/localplt.data b/sysdeps/unix/sysv/linux/alpha/localplt.data index 43f6fdaea1..44bf36f4f1 100644 --- a/sysdeps/unix/sysv/linux/alpha/localplt.data +++ b/sysdeps/unix/sysv/linux/alpha/localplt.data @@ -18,7 +18,6 @@ libc.so: _Unwind_Find_FDE libc.so: calloc + RELA R_ALPHA_GLOB_DAT libc.so: free + RELA R_ALPHA_GLOB_DAT libc.so: malloc + RELA R_ALPHA_GLOB_DAT -libc.so: memalign + RELA R_ALPHA_GLOB_DAT libc.so: realloc + RELA R_ALPHA_GLOB_DAT libm.so: matherr + RELA R_ALPHA_GLOB_DAT # We used to offer inline functions that used this, so it must be exported. diff --git a/sysdeps/unix/sysv/linux/arc/localplt.data b/sysdeps/unix/sysv/linux/arc/localplt.data index 4479e8ee8a..ac5332caf7 100644 --- a/sysdeps/unix/sysv/linux/arc/localplt.data +++ b/sysdeps/unix/sysv/linux/arc/localplt.data @@ -1,6 +1,5 @@ libc.so: realloc libc.so: malloc -libc.so: memalign libc.so: calloc libc.so: free # At -Os, a struct assignment in libgcc-static pulls this in diff --git a/sysdeps/unix/sysv/linux/arm/localplt.data b/sysdeps/unix/sysv/linux/arm/localplt.data index eb315da2f1..78896444c6 100644 --- a/sysdeps/unix/sysv/linux/arm/localplt.data +++ b/sysdeps/unix/sysv/linux/arm/localplt.data @@ -1,7 +1,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: raise libc.so: realloc libm.so: matherr diff --git a/sysdeps/unix/sysv/linux/csky/localplt.data b/sysdeps/unix/sysv/linux/csky/localplt.data index 0ed8650b65..817ab2659a 100644 --- a/sysdeps/unix/sysv/linux/csky/localplt.data +++ b/sysdeps/unix/sysv/linux/csky/localplt.data @@ -4,7 +4,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc # The TLS-enabled version of these functions is interposed from libc.so. ld.so: _dl_signal_error diff --git a/sysdeps/unix/sysv/linux/hppa/localplt.data b/sysdeps/unix/sysv/linux/hppa/localplt.data index 09893d4dcf..baf857a750 100644 --- a/sysdeps/unix/sysv/linux/hppa/localplt.data +++ b/sysdeps/unix/sysv/linux/hppa/localplt.data @@ -4,7 +4,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libc.so: __sigsetjmp libc.so: _IO_funlockfile diff --git a/sysdeps/unix/sysv/linux/i386/localplt.data b/sysdeps/unix/sysv/linux/i386/localplt.data index 5334875b4b..f9bf7fb410 100644 --- a/sysdeps/unix/sysv/linux/i386/localplt.data +++ b/sysdeps/unix/sysv/linux/i386/localplt.data @@ -4,7 +4,6 @@ libc.so: _Unwind_Find_FDE + REL R_386_GLOB_DAT libc.so: calloc + REL R_386_GLOB_DAT libc.so: free + REL R_386_GLOB_DAT libc.so: malloc + REL R_386_GLOB_DAT -libc.so: memalign + REL R_386_GLOB_DAT libc.so: realloc + REL R_386_GLOB_DAT libm.so: matherr + REL R_386_GLOB_DAT # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/ia64/localplt.data b/sysdeps/unix/sysv/linux/ia64/localplt.data index 1c566a503e..174fb88128 100644 --- a/sysdeps/unix/sysv/linux/ia64/localplt.data +++ b/sysdeps/unix/sysv/linux/ia64/localplt.data @@ -1,7 +1,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr libm.so: matherrf diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data index 3c5efb7204..42fa90508c 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data @@ -2,7 +2,6 @@ libc.so: __m68k_read_tp libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data index 843f4e25f2..34bd4c1aca 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data @@ -3,7 +3,6 @@ libc.so: __m68k_read_tp libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/microblaze/localplt.data b/sysdeps/unix/sysv/linux/microblaze/localplt.data index 0e98d5251e..c3801314c9 100644 --- a/sysdeps/unix/sysv/linux/microblaze/localplt.data +++ b/sysdeps/unix/sysv/linux/microblaze/localplt.data @@ -2,7 +2,6 @@ libc.so: __errno_location libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The dynamic loader needs __tls_get_addr for TLS. diff --git a/sysdeps/unix/sysv/linux/nios2/localplt.data b/sysdeps/unix/sysv/linux/nios2/localplt.data index b37987c7c0..17fcfdd4db 100644 --- a/sysdeps/unix/sysv/linux/nios2/localplt.data +++ b/sysdeps/unix/sysv/linux/nios2/localplt.data @@ -6,7 +6,6 @@ libc.so: __gedf2 libc.so: malloc libc.so: __gtsf2 ? libc.so: __nesf2 -libc.so: memalign libc.so: __mulsf3 libc.so: __floatunsisf libc.so: __addsf3 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data index a02dd5cc24..c0af84eef7 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data @@ -2,7 +2,6 @@ libc.so: _Unwind_Find_FDE libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data index d8072597b7..581e54b95c 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data @@ -30,7 +30,6 @@ libc.so: abort ? libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: memset ? libc.so: realloc libm.so: copysignl ? diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data index bb498fbe3a..d69b7ae646 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data @@ -1,7 +1,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/riscv/localplt.data b/sysdeps/unix/sysv/linux/riscv/localplt.data index 0a235592c3..e6d5330d5b 100644 --- a/sysdeps/unix/sysv/linux/riscv/localplt.data +++ b/sysdeps/unix/sysv/linux/riscv/localplt.data @@ -4,7 +4,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: memset ? libc.so: realloc # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/s390/localplt.data b/sysdeps/unix/sysv/linux/s390/localplt.data index a02dd5cc24..c0af84eef7 100644 --- a/sysdeps/unix/sysv/linux/s390/localplt.data +++ b/sysdeps/unix/sysv/linux/s390/localplt.data @@ -2,7 +2,6 @@ libc.so: _Unwind_Find_FDE libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/sh/localplt.data b/sysdeps/unix/sysv/linux/sh/localplt.data index 3225177c50..6491b9e37b 100644 --- a/sysdeps/unix/sysv/linux/sh/localplt.data +++ b/sysdeps/unix/sysv/linux/sh/localplt.data @@ -4,7 +4,6 @@ libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libc.so: _Unwind_Find_FDE libc.so: _exit diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data index be51efd566..38309a1393 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data @@ -16,7 +16,6 @@ libc.so: _Unwind_Find_FDE libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data index 809062d46c..6a216f3a5a 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data @@ -15,7 +15,6 @@ libc.so: _Unwind_Find_FDE libc.so: calloc libc.so: free libc.so: malloc -libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/x86_64/localplt.data b/sysdeps/x86_64/localplt.data index 8f41e92870..d1f2e26612 100644 --- a/sysdeps/x86_64/localplt.data +++ b/sysdeps/x86_64/localplt.data @@ -6,7 +6,6 @@ libc.so: calloc + RELA R_X86_64_GLOB_DAT libc.so: free + RELA R_X86_64_GLOB_DAT libc.so: malloc + RELA R_X86_64_GLOB_DAT -libc.so: memalign + RELA R_X86_64_GLOB_DAT libc.so: realloc + RELA R_X86_64_GLOB_DAT libm.so: matherr + RELA R_X86_64_GLOB_DAT # The TLS-enabled version of these functions is interposed from libc.so. From patchwork Thu Jun 24 18:23:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 44007 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id ABCF639B241A for ; Thu, 24 Jun 2021 18:29:31 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org ABCF639B241A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624559371; bh=o8RgCeDSiiL5mTpG8ZQmNJCg7wqZIgctV4PA4vGxMfI=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=WWssrHSVcK839u73YJOCgFMC8nMZGzmHM4H16y9auAMNLRBTbYpbNJ82WjfTEC3Sw 0Zwia81frVvITQ2QfS/YkKgiYx7RR/4I2fuHyWon8eemQXV3qsjjWp5vkeYTDq5N7w pRXtccEbg5egwz+P3LYaKCeK5ZlUXuURvRcqHMhw= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from hamster.birch.relay.mailchannels.net (hamster.birch.relay.mailchannels.net [23.83.209.80]) by sourceware.org (Postfix) with ESMTPS id 3C73C39B040E for ; Thu, 24 Jun 2021 18:23:53 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 3C73C39B040E X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id 0AD1E34178A; Thu, 24 Jun 2021 18:23:52 +0000 (UTC) Received: from pdx1-sub0-mail-a66.g.dreamhost.com (100-96-17-75.trex.outbound.svc.cluster.local [100.96.17.75]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id 8CC3F341B9E; Thu, 24 Jun 2021 18:23:51 +0000 (UTC) X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from pdx1-sub0-mail-a66.g.dreamhost.com (pop.dreamhost.com [64.90.62.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384) by 100.96.17.75 (trex/6.3.3); Thu, 24 Jun 2021 18:23:52 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|siddhesh@gotplt.org X-MailChannels-Auth-Id: dreamhost X-Industry-Ski: 272253b9728fa1c7_1624559031880_1913361899 X-MC-Loop-Signature: 1624559031880:2359448319 X-MC-Ingress-Time: 1624559031880 Received: from pdx1-sub0-mail-a66.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTP id 354018DD5F; Thu, 24 Jun 2021 11:23:51 -0700 (PDT) Received: from rhbox.intra.reserved-bit.com (unknown [1.186.101.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTPSA id 135438DD5D; Thu, 24 Jun 2021 11:23:48 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a66 To: libc-alpha@sourceware.org Subject: [PATCH 6/8] Remove malloc hooks Date: Thu, 24 Jun 2021 23:53:10 +0530 Message-Id: <20210624182312.236596-7-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624182312.236596-1-siddhesh@sourceware.org> References: <20210624182312.236596-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-3493.8 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NEUTRAL, TXREP, URIBL_BLACK autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Make malloc hooks symbols compat-only so that new applications cannot link against them and remove the declarations from the API. The existing hooks variables are not used in the library anymore. Legacy applications that need hooks functionality need to preload a new DSO libmalloc_compathooks.so, which interposes the libc malloc functions to execute hooks if they exist. Also remove all references to the malloc hooks in the manual. Mention the removal in NEWS and also warn that libmalloc_compathooks.so is a temporary measure and may be removed in a future version of glibc. memalign makes a comeback as a PLT reference since the initialization hooks use them. tst-mallocstate now needs libmalloc_compathooks.so since it uses __malloc_initialize_hook to set up initial heap state to emumate emacs. --- Makeconfig | 2 +- NEWS | 9 + malloc/Makefile | 15 +- malloc/arena.c | 5 - malloc/hooks.c | 114 ++++++----- malloc/malloc-compathooks.c | 166 +++++++++++++++ malloc/malloc.c | 10 - malloc/malloc.h | 14 -- manual/memory.texi | 191 +----------------- sysdeps/generic/localplt.data | 1 + sysdeps/mach/hurd/i386/localplt.data | 1 + sysdeps/unix/sysv/linux/aarch64/localplt.data | 1 + sysdeps/unix/sysv/linux/alpha/localplt.data | 1 + sysdeps/unix/sysv/linux/arc/localplt.data | 1 + sysdeps/unix/sysv/linux/arm/localplt.data | 1 + sysdeps/unix/sysv/linux/csky/localplt.data | 1 + sysdeps/unix/sysv/linux/hppa/localplt.data | 1 + sysdeps/unix/sysv/linux/i386/localplt.data | 1 + sysdeps/unix/sysv/linux/ia64/localplt.data | 1 + .../sysv/linux/m68k/coldfire/localplt.data | 1 + .../unix/sysv/linux/m68k/m680x0/localplt.data | 1 + .../unix/sysv/linux/microblaze/localplt.data | 1 + sysdeps/unix/sysv/linux/nios2/localplt.data | 1 + .../linux/powerpc/powerpc32/fpu/localplt.data | 1 + .../powerpc/powerpc32/nofpu/localplt.data | 1 + .../linux/powerpc/powerpc64/localplt.data | 1 + sysdeps/unix/sysv/linux/riscv/localplt.data | 1 + sysdeps/unix/sysv/linux/s390/localplt.data | 1 + sysdeps/unix/sysv/linux/sh/localplt.data | 1 + .../sysv/linux/sparc/sparc32/localplt.data | 1 + .../sysv/linux/sparc/sparc64/localplt.data | 1 + sysdeps/x86_64/localplt.data | 1 + 32 files changed, 284 insertions(+), 265 deletions(-) create mode 100644 malloc/malloc-compathooks.c diff --git a/Makeconfig b/Makeconfig index 407df9e6a1..991d6d3e99 100644 --- a/Makeconfig +++ b/Makeconfig @@ -951,7 +951,7 @@ libio-include = -I$(..)libio built-modules = iconvprogs iconvdata ldconfig lddlibc4 libmemusage \ libSegFault libpcprofile librpcsvc locale-programs \ memusagestat nonlib nscd extramodules libnldbl libsupport \ - testsuite + testsuite libmalloc_compathooks in-module = $(subst -,_,$(firstword $(libof-$(basename $(@F))) \ $(libof-$(. */ + +#include +#include +#include +#include +#include + +extern void (*__free_hook) (void *__ptr, const void *); +compat_symbol_reference (libc, __free_hook, __free_hook, GLIBC_2_0); +extern void * (*__malloc_hook) (size_t __size, const void *); +compat_symbol_reference (libc, __malloc_hook, __malloc_hook, GLIBC_2_0); +extern void * (*__realloc_hook) + (void *__ptr, size_t __size, const void *); +compat_symbol_reference (libc, __realloc_hook, __realloc_hook, GLIBC_2_0); +extern void * (*__memalign_hook) + (size_t __alignment, size_t __size, const void *); +compat_symbol_reference (libc, __memalign_hook, __memalign_hook, GLIBC_2_0); + +/* Support only the glibc allocators. */ +extern void *__libc_malloc (size_t); +extern void __libc_free (void *); +extern void *__libc_realloc (void *, size_t); +extern void *__libc_memalign (size_t, size_t); +extern void *__libc_valloc (size_t); +extern void *__libc_pvalloc (size_t); +extern void *__libc_calloc (size_t, size_t); + +static size_t pagesize; + +/* The allocator functions. */ + +static void * +__compathook_malloc (size_t bytes) +{ + void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook); + if (__builtin_expect (hook != NULL, 0)) + return (*hook)(bytes, RETURN_ADDRESS (0)); + + return __libc_malloc (bytes); +} +strong_alias (__compathook_malloc, malloc) + +static void +__compathook_free (void *mem) +{ + void (*hook) (void *, const void *) = atomic_forced_read (__free_hook); + if (__builtin_expect (hook != NULL, 0)) + { + (*hook)(mem, RETURN_ADDRESS (0)); + return; + } + __libc_free (mem); +} +strong_alias (__compathook_free, free) + +static void * +__compathook_realloc (void *oldmem, size_t bytes) +{ + void *(*hook) (void *, size_t, const void *) = + atomic_forced_read (__realloc_hook); + if (__builtin_expect (hook != NULL, 0)) + return (*hook)(oldmem, bytes, RETURN_ADDRESS (0)); + + return __libc_realloc (oldmem, bytes); +} +strong_alias (__compathook_realloc, realloc) + +static void * +__compathook_memalign (size_t alignment, size_t bytes) +{ + void *(*hook) (size_t, size_t, const void *) = + atomic_forced_read (__memalign_hook); + if (__builtin_expect (hook != NULL, 0)) + return (*hook)(alignment, bytes, RETURN_ADDRESS (0)); + + return __libc_memalign (alignment, bytes); +} +strong_alias (__compathook_memalign, memalign) + +static void * +__compathook_pvalloc (size_t bytes) +{ + void *(*hook) (size_t, size_t, const void *) = + atomic_forced_read (__memalign_hook); + if (__builtin_expect (hook != NULL, 0)) + { + size_t rounded_bytes; + + if (!pagesize) + pagesize = sysconf (_SC_PAGESIZE); + + /* ALIGN_UP with overflow check. */ + if (__glibc_unlikely (__builtin_add_overflow (bytes, + pagesize - 1, + &rounded_bytes))) + { + errno = ENOMEM; + return NULL; + } + rounded_bytes = rounded_bytes & -(pagesize - 1); + return (*hook)(pagesize, rounded_bytes, RETURN_ADDRESS (0)); + } + + return __libc_pvalloc (bytes); +} +strong_alias (__compathook_pvalloc, pvalloc) + +static void * +__compathook_valloc (size_t bytes) +{ + void *(*hook) (size_t, size_t, const void *) = + atomic_forced_read (__memalign_hook); + if (__builtin_expect (hook != NULL, 0)) + { + if (!pagesize) + pagesize = sysconf (_SC_PAGESIZE); + + return (*hook)(pagesize, bytes, RETURN_ADDRESS (0)); + } + + return __libc_valloc (bytes); +} +strong_alias (__compathook_valloc, valloc) + +static void * +__compathook_calloc (size_t nmemb, size_t size) +{ + void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook); + if (__builtin_expect (hook != NULL, 0)) + { + size_t bytes; + + if (__glibc_unlikely (__builtin_mul_overflow (nmemb, size, &bytes))) + { + errno = ENOMEM; + return NULL; + } + + void *mem = (*hook)(bytes, RETURN_ADDRESS (0)); + + if (mem != NULL) + memset (mem, 0, bytes); + + return mem; + } + + return __libc_calloc (nmemb, size); +} +strong_alias (__compathook_calloc, calloc) diff --git a/malloc/malloc.c b/malloc/malloc.c index 5ea12d1d3b..16ad933c66 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -570,16 +570,6 @@ tag_at (void *ptr) #define HAVE_MREMAP 0 #endif -/* We may need to support __malloc_initialize_hook for backwards - compatibility. */ - -#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_24) -# define HAVE_MALLOC_INIT_HOOK 1 -#else -# define HAVE_MALLOC_INIT_HOOK 0 -#endif - - /* This version of malloc supports the standard SVID/XPG mallinfo routine that returns a struct containing usage properties and diff --git a/malloc/malloc.h b/malloc/malloc.h index c1c0896d29..709fa454b5 100644 --- a/malloc/malloc.h +++ b/malloc/malloc.h @@ -165,20 +165,6 @@ extern void malloc_stats (void) __THROW; extern int malloc_info (int __options, FILE *__fp) __THROW; /* Hooks for debugging and user-defined versions. */ -extern void (*__MALLOC_HOOK_VOLATILE __free_hook) (void *__ptr, - const void *) -__MALLOC_DEPRECATED; -extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook)(size_t __size, - const void *) -__MALLOC_DEPRECATED; -extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook)(void *__ptr, - size_t __size, - const void *) -__MALLOC_DEPRECATED; -extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook)(size_t __alignment, - size_t __size, - const void *) -__MALLOC_DEPRECATED; extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void) __MALLOC_DEPRECATED; diff --git a/manual/memory.texi b/manual/memory.texi index 28ec2e4e63..e66ecd582d 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -328,8 +328,6 @@ any time (or never). * Malloc Tunable Parameters:: Use @code{mallopt} to adjust allocation parameters. * Heap Consistency Checking:: Automatic checking for errors. -* Hooks for Malloc:: You can use these hooks for debugging - programs that use @code{malloc}. * Statistics of Malloc:: Getting information about how much memory your program is using. * Summary of Malloc:: Summary of @code{malloc} and related functions. @@ -1388,170 +1386,6 @@ compatibility. Both @code{MALLOC_CHECK_} and @samp{-lmcheck} should uncover the same bugs - but using @code{MALLOC_CHECK_} you don't need to recompile your application. -@node Hooks for Malloc -@subsubsection Memory Allocation Hooks -@cindex allocation hooks, for @code{malloc} - -@Theglibc{} lets you modify the behavior of @code{malloc}, -@code{realloc}, and @code{free} by specifying appropriate hook -functions. You can use these hooks to help you debug programs that use -dynamic memory allocation, for example. - -The hook variables are declared in @file{malloc.h}. -@pindex malloc.h - -@defvar __malloc_hook -@standards{GNU, malloc.h} -The value of this variable is a pointer to the function that -@code{malloc} uses whenever it is called. You should define this -function to look like @code{malloc}; that is, like: - -@smallexample -void *@var{function} (size_t @var{size}, const void *@var{caller}) -@end smallexample - -The value of @var{caller} is the return address found on the stack when -the @code{malloc} function was called. This value allows you to trace -the memory consumption of the program. -@end defvar - -@defvar __realloc_hook -@standards{GNU, malloc.h} -The value of this variable is a pointer to function that @code{realloc} -uses whenever it is called. You should define this function to look -like @code{realloc}; that is, like: - -@smallexample -void *@var{function} (void *@var{ptr}, size_t @var{size}, const void *@var{caller}) -@end smallexample - -The value of @var{caller} is the return address found on the stack when -the @code{realloc} function was called. This value allows you to trace the -memory consumption of the program. -@end defvar - -@defvar __free_hook -@standards{GNU, malloc.h} -The value of this variable is a pointer to function that @code{free} -uses whenever it is called. You should define this function to look -like @code{free}; that is, like: - -@smallexample -void @var{function} (void *@var{ptr}, const void *@var{caller}) -@end smallexample - -The value of @var{caller} is the return address found on the stack when -the @code{free} function was called. This value allows you to trace the -memory consumption of the program. -@end defvar - -@defvar __memalign_hook -@standards{GNU, malloc.h} -The value of this variable is a pointer to function that @code{aligned_alloc}, -@code{memalign}, @code{posix_memalign} and @code{valloc} use whenever they -are called. You should define this function to look like @code{aligned_alloc}; -that is, like: - -@smallexample -void *@var{function} (size_t @var{alignment}, size_t @var{size}, const void *@var{caller}) -@end smallexample - -The value of @var{caller} is the return address found on the stack when -the @code{aligned_alloc}, @code{memalign}, @code{posix_memalign} or -@code{valloc} functions are called. This value allows you to trace the -memory consumption of the program. -@end defvar - -You must make sure that the function you install as a hook for one of -these functions does not call that function recursively without restoring -the old value of the hook first! Otherwise, your program will get stuck -in an infinite recursion. Before calling the function recursively, one -should make sure to restore all the hooks to their previous value. When -coming back from the recursive call, all the hooks should be resaved -since a hook might modify itself. - -An issue to look out for is the time at which the hook functions -can be safely installed. If the hook functions call the @code{malloc}-related -functions recursively, it is necessary that @code{malloc} has already properly -initialized itself at the time when @code{__malloc_hook} etc. is -assigned to. On the other hand, if the hook functions provide a -complete @code{malloc} implementation of their own, it is vital that the hooks -are assigned to @emph{before} the very first @code{malloc} call has -completed, because otherwise a chunk obtained from the ordinary, -un-hooked @code{malloc} may later be handed to @code{__free_hook}, for example. - -Here is an example showing how to use @code{__malloc_hook} and -@code{__free_hook} properly. It installs a function that prints out -information every time @code{malloc} or @code{free} is called. We just -assume here that @code{realloc} and @code{memalign} are not used in our -program. - -@smallexample -/* Prototypes for __malloc_hook, __free_hook */ -#include - -/* Prototypes for our hooks. */ -static void my_init_hook (void); -static void *my_malloc_hook (size_t, const void *); -static void my_free_hook (void*, const void *); - -static void -my_init (void) -@{ - old_malloc_hook = __malloc_hook; - old_free_hook = __free_hook; - __malloc_hook = my_malloc_hook; - __free_hook = my_free_hook; -@} - -static void * -my_malloc_hook (size_t size, const void *caller) -@{ - void *result; - /* Restore all old hooks */ - __malloc_hook = old_malloc_hook; - __free_hook = old_free_hook; - /* Call recursively */ - result = malloc (size); - /* Save underlying hooks */ - old_malloc_hook = __malloc_hook; - old_free_hook = __free_hook; - /* @r{@code{printf} might call @code{malloc}, so protect it too.} */ - printf ("malloc (%u) returns %p\n", (unsigned int) size, result); - /* Restore our own hooks */ - __malloc_hook = my_malloc_hook; - __free_hook = my_free_hook; - return result; -@} - -static void -my_free_hook (void *ptr, const void *caller) -@{ - /* Restore all old hooks */ - __malloc_hook = old_malloc_hook; - __free_hook = old_free_hook; - /* Call recursively */ - free (ptr); - /* Save underlying hooks */ - old_malloc_hook = __malloc_hook; - old_free_hook = __free_hook; - /* @r{@code{printf} might call @code{free}, so protect it too.} */ - printf ("freed pointer %p\n", ptr); - /* Restore our own hooks */ - __malloc_hook = my_malloc_hook; - __free_hook = my_free_hook; -@} - -main () -@{ - my_init (); - @dots{} -@} -@end smallexample - -The @code{mcheck} function (@pxref{Heap Consistency Checking}) works by -installing such hooks. - @c __morecore, __after_morecore_hook are undocumented @c It's not clear whether to document them. @@ -1686,19 +1520,6 @@ Tell @code{malloc} to perform occasional consistency checks on dynamically allocated memory, and to call @var{abortfn} when an inconsistency is found. @xref{Heap Consistency Checking}. -@item void *(*__malloc_hook) (size_t @var{size}, const void *@var{caller}) -A pointer to a function that @code{malloc} uses whenever it is called. - -@item void *(*__realloc_hook) (void *@var{ptr}, size_t @var{size}, const void *@var{caller}) -A pointer to a function that @code{realloc} uses whenever it is called. - -@item void (*__free_hook) (void *@var{ptr}, const void *@var{caller}) -A pointer to a function that @code{free} uses whenever it is called. - -@item void (*__memalign_hook) (size_t @var{size}, size_t @var{alignment}, const void *@var{caller}) -A pointer to a function that @code{aligned_alloc}, @code{memalign}, -@code{posix_memalign} and @code{valloc} use whenever they are called. - @item struct mallinfo2 mallinfo2 (void) Return information about the current dynamic memory usage. @xref{Statistics of Malloc}. @@ -1733,7 +1554,7 @@ penalties for the program if the debugging mode is not enabled. @deftypefun void mtrace (void) @standards{GNU, mcheck.h} -@safety{@prelim{}@mtunsafe{@mtsenv{} @mtasurace{:mtrace} @mtasuconst{:malloc_hooks} @mtuinit{}}@asunsafe{@asuinit{} @ascuheap{} @asucorrupt{} @asulock{}}@acunsafe{@acuinit{} @acucorrupt{} @aculock{} @acsfd{} @acsmem{}}} +@safety{@prelim{}@mtunsafe{@mtsenv{} @mtasurace{:mtrace} @mtuinit{}}@asunsafe{@asuinit{} @ascuheap{} @asucorrupt{} @asulock{}}@acunsafe{@acuinit{} @acucorrupt{} @aculock{} @acsfd{} @acsmem{}}} @c Like the mcheck hooks, these are not designed with thread safety in @c mind, because the hook pointers are temporarily modified without @c regard to other threads, signals or cancellation. @@ -1758,10 +1579,10 @@ with the SUID or SGID bit set. If the named file is successfully opened, @code{mtrace} installs special handlers for the functions @code{malloc}, @code{realloc}, and -@code{free} (@pxref{Hooks for Malloc}). From then on, all uses of these -functions are traced and protocolled into the file. There is now of -course a speed penalty for all calls to the traced functions so tracing -should not be enabled during normal use. +@code{free}. From then on, all uses of these functions are traced and +protocolled into the file. There is now of course a speed penalty for all +calls to the traced functions so tracing should not be enabled during normal +use. This function is a GNU extension and generally not available on other systems. The prototype can be found in @file{mcheck.h}. @@ -1769,7 +1590,7 @@ systems. The prototype can be found in @file{mcheck.h}. @deftypefun void muntrace (void) @standards{GNU, mcheck.h} -@safety{@prelim{}@mtunsafe{@mtasurace{:mtrace} @mtasuconst{:malloc_hooks} @mtslocale{}}@asunsafe{@asucorrupt{} @ascuheap{}}@acunsafe{@acucorrupt{} @acsmem{} @aculock{} @acsfd{}}} +@safety{@prelim{}@mtunsafe{@mtasurace{:mtrace} @mtslocale{}}@asunsafe{@asucorrupt{} @ascuheap{}}@acunsafe{@acucorrupt{} @acsmem{} @aculock{} @acsfd{}}} @c muntrace @mtasurace:mtrace @mtslocale @asucorrupt @ascuheap @acucorrupt @acsmem @aculock @acsfd @c fprintf (fputs) dup @mtslocale @asucorrupt @ascuheap @acsmem @aculock @acucorrupt diff --git a/sysdeps/generic/localplt.data b/sysdeps/generic/localplt.data index 9b4f35786a..e2083c0ce6 100644 --- a/sysdeps/generic/localplt.data +++ b/sysdeps/generic/localplt.data @@ -4,6 +4,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/mach/hurd/i386/localplt.data b/sysdeps/mach/hurd/i386/localplt.data index 47fbe1e2a7..94064ecbc5 100644 --- a/sysdeps/mach/hurd/i386/localplt.data +++ b/sysdeps/mach/hurd/i386/localplt.data @@ -6,6 +6,7 @@ libc.so: calloc + REL R_386_GLOB_DAT libc.so: free + REL R_386_GLOB_DAT libc.so: malloc + REL R_386_GLOB_DAT +libc.so: memalign + REL R_386_GLOB_DAT libc.so: realloc + REL R_386_GLOB_DAT libm.so: matherr + REL R_386_GLOB_DAT # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/aarch64/localplt.data b/sysdeps/unix/sysv/linux/aarch64/localplt.data index 348b3f3793..2c14b652ef 100644 --- a/sysdeps/unix/sysv/linux/aarch64/localplt.data +++ b/sysdeps/unix/sysv/linux/aarch64/localplt.data @@ -4,6 +4,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # If outline atomics are used, libgcc (built outside of glibc) may diff --git a/sysdeps/unix/sysv/linux/alpha/localplt.data b/sysdeps/unix/sysv/linux/alpha/localplt.data index 44bf36f4f1..43f6fdaea1 100644 --- a/sysdeps/unix/sysv/linux/alpha/localplt.data +++ b/sysdeps/unix/sysv/linux/alpha/localplt.data @@ -18,6 +18,7 @@ libc.so: _Unwind_Find_FDE libc.so: calloc + RELA R_ALPHA_GLOB_DAT libc.so: free + RELA R_ALPHA_GLOB_DAT libc.so: malloc + RELA R_ALPHA_GLOB_DAT +libc.so: memalign + RELA R_ALPHA_GLOB_DAT libc.so: realloc + RELA R_ALPHA_GLOB_DAT libm.so: matherr + RELA R_ALPHA_GLOB_DAT # We used to offer inline functions that used this, so it must be exported. diff --git a/sysdeps/unix/sysv/linux/arc/localplt.data b/sysdeps/unix/sysv/linux/arc/localplt.data index ac5332caf7..4479e8ee8a 100644 --- a/sysdeps/unix/sysv/linux/arc/localplt.data +++ b/sysdeps/unix/sysv/linux/arc/localplt.data @@ -1,5 +1,6 @@ libc.so: realloc libc.so: malloc +libc.so: memalign libc.so: calloc libc.so: free # At -Os, a struct assignment in libgcc-static pulls this in diff --git a/sysdeps/unix/sysv/linux/arm/localplt.data b/sysdeps/unix/sysv/linux/arm/localplt.data index 78896444c6..eb315da2f1 100644 --- a/sysdeps/unix/sysv/linux/arm/localplt.data +++ b/sysdeps/unix/sysv/linux/arm/localplt.data @@ -1,6 +1,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: raise libc.so: realloc libm.so: matherr diff --git a/sysdeps/unix/sysv/linux/csky/localplt.data b/sysdeps/unix/sysv/linux/csky/localplt.data index 817ab2659a..0ed8650b65 100644 --- a/sysdeps/unix/sysv/linux/csky/localplt.data +++ b/sysdeps/unix/sysv/linux/csky/localplt.data @@ -4,6 +4,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc # The TLS-enabled version of these functions is interposed from libc.so. ld.so: _dl_signal_error diff --git a/sysdeps/unix/sysv/linux/hppa/localplt.data b/sysdeps/unix/sysv/linux/hppa/localplt.data index baf857a750..09893d4dcf 100644 --- a/sysdeps/unix/sysv/linux/hppa/localplt.data +++ b/sysdeps/unix/sysv/linux/hppa/localplt.data @@ -4,6 +4,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libc.so: __sigsetjmp libc.so: _IO_funlockfile diff --git a/sysdeps/unix/sysv/linux/i386/localplt.data b/sysdeps/unix/sysv/linux/i386/localplt.data index f9bf7fb410..5334875b4b 100644 --- a/sysdeps/unix/sysv/linux/i386/localplt.data +++ b/sysdeps/unix/sysv/linux/i386/localplt.data @@ -4,6 +4,7 @@ libc.so: _Unwind_Find_FDE + REL R_386_GLOB_DAT libc.so: calloc + REL R_386_GLOB_DAT libc.so: free + REL R_386_GLOB_DAT libc.so: malloc + REL R_386_GLOB_DAT +libc.so: memalign + REL R_386_GLOB_DAT libc.so: realloc + REL R_386_GLOB_DAT libm.so: matherr + REL R_386_GLOB_DAT # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/ia64/localplt.data b/sysdeps/unix/sysv/linux/ia64/localplt.data index 174fb88128..1c566a503e 100644 --- a/sysdeps/unix/sysv/linux/ia64/localplt.data +++ b/sysdeps/unix/sysv/linux/ia64/localplt.data @@ -1,6 +1,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr libm.so: matherrf diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data index 42fa90508c..3c5efb7204 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data @@ -2,6 +2,7 @@ libc.so: __m68k_read_tp libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data index 34bd4c1aca..843f4e25f2 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data @@ -3,6 +3,7 @@ libc.so: __m68k_read_tp libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/microblaze/localplt.data b/sysdeps/unix/sysv/linux/microblaze/localplt.data index c3801314c9..0e98d5251e 100644 --- a/sysdeps/unix/sysv/linux/microblaze/localplt.data +++ b/sysdeps/unix/sysv/linux/microblaze/localplt.data @@ -2,6 +2,7 @@ libc.so: __errno_location libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The dynamic loader needs __tls_get_addr for TLS. diff --git a/sysdeps/unix/sysv/linux/nios2/localplt.data b/sysdeps/unix/sysv/linux/nios2/localplt.data index 17fcfdd4db..b37987c7c0 100644 --- a/sysdeps/unix/sysv/linux/nios2/localplt.data +++ b/sysdeps/unix/sysv/linux/nios2/localplt.data @@ -6,6 +6,7 @@ libc.so: __gedf2 libc.so: malloc libc.so: __gtsf2 ? libc.so: __nesf2 +libc.so: memalign libc.so: __mulsf3 libc.so: __floatunsisf libc.so: __addsf3 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data index c0af84eef7..a02dd5cc24 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data @@ -2,6 +2,7 @@ libc.so: _Unwind_Find_FDE libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data index 581e54b95c..d8072597b7 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data @@ -30,6 +30,7 @@ libc.so: abort ? libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: memset ? libc.so: realloc libm.so: copysignl ? diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data index d69b7ae646..bb498fbe3a 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data @@ -1,6 +1,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/riscv/localplt.data b/sysdeps/unix/sysv/linux/riscv/localplt.data index e6d5330d5b..0a235592c3 100644 --- a/sysdeps/unix/sysv/linux/riscv/localplt.data +++ b/sysdeps/unix/sysv/linux/riscv/localplt.data @@ -4,6 +4,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: memset ? libc.so: realloc # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/s390/localplt.data b/sysdeps/unix/sysv/linux/s390/localplt.data index c0af84eef7..a02dd5cc24 100644 --- a/sysdeps/unix/sysv/linux/s390/localplt.data +++ b/sysdeps/unix/sysv/linux/s390/localplt.data @@ -2,6 +2,7 @@ libc.so: _Unwind_Find_FDE libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/sh/localplt.data b/sysdeps/unix/sysv/linux/sh/localplt.data index 6491b9e37b..3225177c50 100644 --- a/sysdeps/unix/sysv/linux/sh/localplt.data +++ b/sysdeps/unix/sysv/linux/sh/localplt.data @@ -4,6 +4,7 @@ libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libc.so: _Unwind_Find_FDE libc.so: _exit diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data index 38309a1393..be51efd566 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data @@ -16,6 +16,7 @@ libc.so: _Unwind_Find_FDE libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data index 6a216f3a5a..809062d46c 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data @@ -15,6 +15,7 @@ libc.so: _Unwind_Find_FDE libc.so: calloc libc.so: free libc.so: malloc +libc.so: memalign libc.so: realloc libm.so: matherr # The TLS-enabled version of these functions is interposed from libc.so. diff --git a/sysdeps/x86_64/localplt.data b/sysdeps/x86_64/localplt.data index d1f2e26612..8f41e92870 100644 --- a/sysdeps/x86_64/localplt.data +++ b/sysdeps/x86_64/localplt.data @@ -6,6 +6,7 @@ libc.so: calloc + RELA R_X86_64_GLOB_DAT libc.so: free + RELA R_X86_64_GLOB_DAT libc.so: malloc + RELA R_X86_64_GLOB_DAT +libc.so: memalign + RELA R_X86_64_GLOB_DAT libc.so: realloc + RELA R_X86_64_GLOB_DAT libm.so: matherr + RELA R_X86_64_GLOB_DAT # The TLS-enabled version of these functions is interposed from libc.so. From patchwork Thu Jun 24 18:23:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 44006 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id A696739B2402 for ; Thu, 24 Jun 2021 18:28:46 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A696739B2402 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624559326; bh=KA3c4ju0aFob2Fzo+trsL6oYV9ChTM1KFIUoAnZnwK4=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=M8xceonKinJBoFGzKiJi197qS1+I4kVbvLZbRlts6qAKzyFlfCTIsQX9F4qdTU7v/ 5fi83sXNCGj19IRC7fm3ib/HGQeZ/gv8ZWizKhxDG8o7JoX9miFQj2wzLv+2uCyzlr lD7DBymKpOapcTZFeqHx+vQ+ehfoiCX0vLmetEf4= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from antelope.elm.relay.mailchannels.net (antelope.elm.relay.mailchannels.net [23.83.212.4]) by sourceware.org (Postfix) with ESMTPS id E0C5039B040B for ; Thu, 24 Jun 2021 18:23:55 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org E0C5039B040B X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id D0846401FC2; Thu, 24 Jun 2021 18:23:54 +0000 (UTC) Received: from pdx1-sub0-mail-a66.g.dreamhost.com (100-96-18-93.trex.outbound.svc.cluster.local [100.96.18.93]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id 58C24402094; Thu, 24 Jun 2021 18:23:54 +0000 (UTC) X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from pdx1-sub0-mail-a66.g.dreamhost.com (pop.dreamhost.com [64.90.62.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384) by 100.96.18.93 (trex/6.3.3); Thu, 24 Jun 2021 18:23:54 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|siddhesh@gotplt.org X-MailChannels-Auth-Id: dreamhost X-Share-Shelf: 4e3d55541e42e6d4_1624559034672_2213011170 X-MC-Loop-Signature: 1624559034671:3792306308 X-MC-Ingress-Time: 1624559034671 Received: from pdx1-sub0-mail-a66.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTP id 1ABF08DD5C; Thu, 24 Jun 2021 11:23:54 -0700 (PDT) Received: from rhbox.intra.reserved-bit.com (unknown [1.186.101.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTPSA id D006B8DD5D; Thu, 24 Jun 2021 11:23:51 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a66 To: libc-alpha@sourceware.org Subject: [PATCH 7/8] Remove __after_morecore_hook Date: Thu, 24 Jun 2021 23:53:11 +0530 Message-Id: <20210624182312.236596-8-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624182312.236596-1-siddhesh@sourceware.org> References: <20210624182312.236596-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-3494.6 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NEUTRAL, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Remove __after_morecore_hook from the API and finalize the symbol so that it can no longer be used in new applications. Old applications using __after_morecore_hook will find that their hook is no longer called. Reviewed-by: DJ Delorie --- malloc/hooks.c | 3 +++ malloc/malloc.c | 30 +----------------------------- malloc/malloc.h | 5 ----- 3 files changed, 4 insertions(+), 34 deletions(-) diff --git a/malloc/hooks.c b/malloc/hooks.c index cc9ffc8b63..fa6b3f4c16 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -78,6 +78,9 @@ compat_symbol (libc, __malloc_hook, __malloc_hook, GLIBC_2_0); compat_symbol (libc, __realloc_hook, __realloc_hook, GLIBC_2_0); compat_symbol (libc, __memalign_hook, __memalign_hook, GLIBC_2_0); +void weak_variable (*__after_morecore_hook) (void) = NULL; +compat_symbol (libc, __after_morecore_hook, __after_morecore_hook, GLIBC_2_0); + /* These hooks will get executed only through the interposed allocator functions in libmalloc_compathooks. This means that the calls to malloc, realloc, etc. will lead back into the interposed functions, which is what we diff --git a/malloc/malloc.c b/malloc/malloc.c index 16ad933c66..51970105b5 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -1988,16 +1988,6 @@ static void malloc_consolidate (mstate); /* -------------- Early definitions for debugging hooks ---------------- */ -/* Define and initialize the hook variables. These weak definitions must - appear before any use of the variables in a function (arena.c uses one). */ -#ifndef weak_variable -/* In GNU libc we want the hook variables to be weak definitions to - avoid a problem with Emacs. */ -# define weak_variable weak_function -#endif - -void weak_variable (*__after_morecore_hook) (void) = NULL; - /* This function is called from the arena shutdown hook, to free the thread cache (if it exists). */ static void tcache_thread_shutdown (void); @@ -2622,14 +2612,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av) LIBC_PROBE (memory_sbrk_more, 2, brk, size); } - if (brk != (char *) (MORECORE_FAILURE)) - { - /* Call the `morecore' hook if necessary. */ - void (*hook) (void) = atomic_forced_read (__after_morecore_hook); - if (__builtin_expect (hook != NULL, 0)) - (*hook)(); - } - else + if (brk == (char *) (MORECORE_FAILURE)) { /* If have mmap, try using it as a backup when MORECORE fails or @@ -2768,13 +2751,6 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av) correction = 0; snd_brk = (char *) (MORECORE (0)); } - else - { - /* Call the `morecore' hook if necessary. */ - void (*hook) (void) = atomic_forced_read (__after_morecore_hook); - if (__builtin_expect (hook != NULL, 0)) - (*hook)(); - } } /* handle non-contiguous cases */ @@ -2933,10 +2909,6 @@ systrim (size_t pad, mstate av) */ MORECORE (-extra); - /* Call the `morecore' hook if necessary. */ - void (*hook) (void) = atomic_forced_read (__after_morecore_hook); - if (__builtin_expect (hook != NULL, 0)) - (*hook)(); new_brk = (char *) (MORECORE (0)); LIBC_PROBE (memory_sbrk_less, 2, new_brk, extra); diff --git a/malloc/malloc.h b/malloc/malloc.h index 709fa454b5..d066a05d82 100644 --- a/malloc/malloc.h +++ b/malloc/malloc.h @@ -164,10 +164,5 @@ extern void malloc_stats (void) __THROW; /* Output information about state of allocator to stream FP. */ extern int malloc_info (int __options, FILE *__fp) __THROW; -/* Hooks for debugging and user-defined versions. */ -extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void) - __MALLOC_DEPRECATED; - - __END_DECLS #endif /* malloc.h */ From patchwork Thu Jun 24 18:23:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddhesh Poyarekar X-Patchwork-Id: 44008 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 61E7439B242C for ; Thu, 24 Jun 2021 18:30:23 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 61E7439B242C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624559423; bh=HOD27TL98EFuCawOzrxWOKV4c+Vw2Y38rQxv+nxLM08=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=Ltc71onJE7aGnYoas77/WVuE+qX275fzaOMBsSMO5m5XYFdQd5mdWuKFICpj8BL8h QfIkxB6FJWYu6/QzWEqHjtws65suzyyjC2Ih9HXT19VYg+s/aNkkf5FZ65Uzun0+23 l037NjT43GN/GTht8qJHXNJ80Stij5kQ3Br2uus0= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from insect.birch.relay.mailchannels.net (insect.birch.relay.mailchannels.net [23.83.209.93]) by sourceware.org (Postfix) with ESMTPS id 9AC6239B0426 for ; 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Thu, 24 Jun 2021 11:23:58 -0700 (PDT) Received: from rhbox.intra.reserved-bit.com (unknown [1.186.101.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a66.g.dreamhost.com (Postfix) with ESMTPSA id E0E2A8CE56; Thu, 24 Jun 2021 11:23:54 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a66 To: libc-alpha@sourceware.org Subject: [PATCH 8/8] Remove __morecore and __default_morecore Date: Thu, 24 Jun 2021 23:53:12 +0530 Message-Id: <20210624182312.236596-9-siddhesh@sourceware.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210624182312.236596-1-siddhesh@sourceware.org> References: <20210624182312.236596-1-siddhesh@sourceware.org> MIME-Version: 1.0 X-Spam-Status: No, score=-3494.6 required=5.0 tests=BAYES_00, GIT_PATCH_0, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NEUTRAL, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Siddhesh Poyarekar via Libc-alpha From: Siddhesh Poyarekar Reply-To: Siddhesh Poyarekar Cc: fweimer@redhat.com Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Make the __morecore and __default_morecore symbols compat-only and remove their declarations from the API. Reviewed-by: DJ Delorie --- NEWS | 5 +++++ include/stdlib.h | 3 --- malloc/arena.c | 12 ++---------- malloc/hooks.c | 3 +++ malloc/malloc-internal.h | 5 +++++ malloc/malloc.c | 4 +--- malloc/malloc.h | 8 -------- malloc/morecore.c | 15 +++++++++++++-- 8 files changed, 29 insertions(+), 26 deletions(-) diff --git a/NEWS b/NEWS index 8a7226aef2..3596593a2a 100644 --- a/NEWS +++ b/NEWS @@ -77,6 +77,11 @@ Deprecated and removed features, and other changes affecting compatibility: legacy programs until they are updated to remove references to the memory allocation hooks. +* The __morecore and __after_morecore_hook malloc hooks and the default + implementation __default_morecore have been removed from the API. Existing + applications will continue to link against these symbols but the interfaces + no longer have any effect on malloc. + Changes to build and runtime requirements: * On Linux, the shm_open, sem_open, and related functions now expect the diff --git a/include/stdlib.h b/include/stdlib.h index e2453c1896..c5cccce85c 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -300,9 +300,6 @@ libc_hidden_proto (__qfcvt_r) # define MB_CUR_MAX (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_MB_CUR_MAX)) # endif -extern void *__default_morecore (ptrdiff_t) __THROW; -libc_hidden_proto (__default_morecore) - struct abort_msg_s { unsigned int size; diff --git a/malloc/arena.c b/malloc/arena.c index 8591c8ea56..00e8b5a32f 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -272,14 +272,6 @@ next_env_entry (char ***position) #endif -#if defined(SHARED) || defined(USE_MTAG) -static void * -__failing_morecore (ptrdiff_t d) -{ - return (void *) MORECORE_FAILURE; -} -#endif - #ifdef SHARED extern struct dl_open_hook *_dl_open_hook; libc_hidden_proto (_dl_open_hook); @@ -300,7 +292,7 @@ ptmalloc_init (void) and that morecore does not support tagged regions, then disable it. */ if (__MTAG_SBRK_UNTAGGED) - __morecore = __failing_morecore; + __always_fail_morecore = true; mtag_enabled = true; mtag_mmap_flags = __MTAG_MMAP_FLAGS; @@ -313,7 +305,7 @@ ptmalloc_init (void) generic sbrk implementation also enforces this, but it is not used on Hurd. */ if (!__libc_initial) - __morecore = __failing_morecore; + __always_fail_morecore = true; #endif thread_arena = &main_arena; diff --git a/malloc/hooks.c b/malloc/hooks.c index fa6b3f4c16..934b6f90d0 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -81,6 +81,9 @@ compat_symbol (libc, __memalign_hook, __memalign_hook, GLIBC_2_0); void weak_variable (*__after_morecore_hook) (void) = NULL; compat_symbol (libc, __after_morecore_hook, __after_morecore_hook, GLIBC_2_0); +void *(*__morecore)(ptrdiff_t); +compat_symbol (libc, __morecore, __morecore, GLIBC_2_0); + /* These hooks will get executed only through the interposed allocator functions in libmalloc_compathooks. This means that the calls to malloc, realloc, etc. will lead back into the interposed functions, which is what we diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h index ee0f5697af..b104f7cdbf 100644 --- a/malloc/malloc-internal.h +++ b/malloc/malloc-internal.h @@ -21,6 +21,7 @@ #include #include +#include /* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of chunk sizes. @@ -63,6 +64,8 @@ #define top(ar_ptr) ((ar_ptr)->top) +extern bool __always_fail_morecore attribute_hidden; + /* Called in the parent process before a fork. */ void __malloc_fork_lock_parent (void) attribute_hidden; @@ -78,4 +81,6 @@ void __malloc_arena_thread_freeres (void) attribute_hidden; /* Activate a standard set of debugging hooks. */ void __malloc_check_init (void) attribute_hidden; +extern void *__glibc_morecore (ptrdiff_t) attribute_hidden; + #endif /* _MALLOC_INTERNAL_H */ diff --git a/malloc/malloc.c b/malloc/malloc.c index 51970105b5..f5058f0f0c 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -382,10 +382,8 @@ __malloc_assert (const char *assertion, const char *file, unsigned int line, /* Definition for getting more memory from the OS. */ -#define MORECORE (*__morecore) +#define MORECORE (*__glibc_morecore) #define MORECORE_FAILURE 0 -void * __default_morecore (ptrdiff_t); -void *(*__morecore)(ptrdiff_t) = __default_morecore; /* Memory tagging. */ diff --git a/malloc/malloc.h b/malloc/malloc.h index d066a05d82..2df0b38050 100644 --- a/malloc/malloc.h +++ b/malloc/malloc.h @@ -76,14 +76,6 @@ extern void *valloc (size_t __size) __THROW __attribute_malloc__ extern void *pvalloc (size_t __size) __THROW __attribute_malloc__ __wur __attr_dealloc_free; -/* Underlying allocation function; successive calls should return - contiguous pieces of memory. */ -extern void *(*__morecore) (ptrdiff_t __size) __MALLOC_DEPRECATED; - -/* Default value of `__morecore'. */ -extern void *__default_morecore (ptrdiff_t __size) -__THROW __attribute_malloc__ __MALLOC_DEPRECATED; - /* SVID2/XPG mallinfo structure */ struct mallinfo diff --git a/malloc/morecore.c b/malloc/morecore.c index 047228779b..c85a85c0eb 100644 --- a/malloc/morecore.c +++ b/malloc/morecore.c @@ -38,16 +38,27 @@ libc_hidden_proto (__sbrk) # define NULL 0 #endif +#if defined(SHARED) || defined(USE_MTAG) +bool __always_fail_morecore = false; +#endif + /* Allocate INCREMENT more bytes of data space, and return the start of data space, or NULL on errors. If INCREMENT is negative, shrink data space. */ void * -__default_morecore (ptrdiff_t increment) +__glibc_morecore (ptrdiff_t increment) { +#if defined(SHARED) || defined(USE_MTAG) + if (__always_fail_morecore) + return NULL; +#endif + void *result = (void *) __sbrk (increment); if (result == (void *) -1) return NULL; return result; } -libc_hidden_def (__default_morecore) +#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34) +compat_symbol (libc, __glibc_morecore, __default_morecore, GLIBC_2_0); +#endif