diff mbox series

[v9,10/10] mcheck Fix malloc_usable_size [BZ #22057]

Message ID 20210719024134.155398-11-siddhesh@sourceware.org
State Superseded
Headers
Series malloc hooks removal |

Checks

Context Check Description
dj/TryBot-apply_patch success Patch applied to master at the time it was sent
dj/TryBot-32bit success Build for i686

Commit Message

Siddhesh Poyarekar July 19, 2021, 2:41 a.m. UTC 
  Interpose malloc_usable_size to return the correct mcheck value for
malloc_usable_size.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
---
 malloc/Makefile       | 4 +---
 malloc/malloc-debug.c | 8 ++++++--
 malloc/mcheck-impl.c  | 6 ++++++
 3 files changed, 13 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/malloc/Makefile b/malloc/Makefile
index 4099d63a2a..6dc3fce3da 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -83,7 +83,7 @@  ifeq ($(have-GLIBC_2.23)$(build-shared),yesyes)
 # the tests expect specific internal behavior that is changed due to linking to
 # libmcheck.a.
 tests-exclude-mcheck = tst-mallocstate \
-	tst-safe-linking tst-malloc-usable \
+	tst-safe-linking \
 	tst-malloc-backtrace \
 	tst-malloc-fork-deadlock \
 	tst-malloc-stats-cancellation \
@@ -92,8 +92,6 @@  tests-exclude-mcheck = tst-mallocstate \
 	tst-malloc-thread-fail \
 	tst-malloc-usable-tunables \
 	tst-malloc_info \
-	tst-pvalloc-fortify \
-	tst-reallocarray \
 	tst-compathooks-off tst-compathooks-on
 
 tests-mcheck = $(filter-out $(tests-exclude-mcheck), $(tests))
diff --git a/malloc/malloc-debug.c b/malloc/malloc-debug.c
index 41cadc31d7..044dd2bf55 100644
--- a/malloc/malloc-debug.c
+++ b/malloc/malloc-debug.c
@@ -370,8 +370,12 @@  strong_alias (__debug_calloc, calloc)
 size_t
 malloc_usable_size (void *mem)
 {
-  return (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)
-	  ? malloc_check_get_size (mem) : musable (mem));
+  if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK))
+    return mcheck_usable_size (mem);
+  if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))
+    return malloc_check_get_size (mem);
+
+  return musable (mem);
 }
 
 #define LIBC_SYMBOL(sym) libc_ ## sym
diff --git a/malloc/mcheck-impl.c b/malloc/mcheck-impl.c
index 8857e6b179..6597a290a6 100644
--- a/malloc/mcheck-impl.c
+++ b/malloc/mcheck-impl.c
@@ -404,3 +404,9 @@  __mcheck_initialize (void (*func) (enum mcheck_status), bool in_pedantic)
   pedantic = in_pedantic;
   return 0;
 }
+
+static int
+mcheck_usable_size (struct hdr *h)
+{
+  return (h - 1)->size;
+}