diff mbox series

[07/14] split out _dl_finalize_segments()

Message ID 20230518082854.3903342-8-stsp2@yandex.ru
State New
Headers
Series implement RTLD_NORELOCATE api [BZ #30007] |

Checks

Context Check Description
dj/TryBot-apply_patch success Patch applied to master at the time it was sent
redhat-pt-bot/TryBot-still_applies warning Patch no longer applies to master

Commit Message

stsp May 18, 2023, 8:28 a.m. UTC 
  This is needed so that further patches can move that to the
relocation code.

The test-suite was run on x86_64/64 and showed no regressions.

Signed-off-by: Stas Sergeev <stsp2@yandex.ru>
---
 elf/dl-load.c         |  3 +++
 elf/dl-load.h         |  5 +++++
 elf/dl-map-segments.h | 36 +++++++++++++++++++++++++++++-------
 3 files changed, 37 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/elf/dl-load.c b/elf/dl-load.c
index 4007a4aae3..28e582fbdf 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1263,6 +1263,9 @@  _dl_map_object_from_fd (const char *name, const char *origname, int fd,
 	l->l_map_start = l->l_map_end = 0;
 	goto lose;
       }
+    errstring = _dl_finalize_segments (l, type, loadcmds, nloadcmds);
+    if (__glibc_unlikely (errstring != NULL))
+      goto lose;
   }
 
   if (l->l_ld != 0)
diff --git a/elf/dl-load.h b/elf/dl-load.h
index 029181e8c8..61f5c4fadf 100644
--- a/elf/dl-load.h
+++ b/elf/dl-load.h
@@ -120,6 +120,11 @@  static const char *_dl_map_segments (struct link_map *l, int fd,
                                      const size_t maplength,
                                      struct link_map *loader);
 
+static const char *_dl_finalize_segments (struct link_map *l,
+                                          int type,
+                                          const struct loadcmd loadcmds[],
+                                          size_t nloadcmds);
+
 /* All the error message strings _dl_map_segments might return are
    listed here so that different implementations in different sysdeps
    dl-map-segments.h files all use consistent strings that are
diff --git a/elf/dl-map-segments.h b/elf/dl-map-segments.h
index 080199b76e..da6b762bca 100644
--- a/elf/dl-map-segments.h
+++ b/elf/dl-map-segments.h
@@ -123,12 +123,10 @@  _dl_map_segments (struct link_map *l, int fd,
 
   while (c < &loadcmds[nloadcmds])
     {
-      ElfW(Addr) hole_start, hole_size;
-
       if (c->mapend > c->mapstart
           /* Map the segment contents from the file.  */
           && (__mmap ((void *) (l->l_addr + c->mapstart),
-                      c->mapend - c->mapstart, c->prot,
+                      c->mapend - c->mapstart, PROT_READ | PROT_WRITE,
                       MAP_FIXED|MAP_COPY|MAP_FILE,
                       fd, c->mapoff)
               == MAP_FAILED))
@@ -136,6 +134,34 @@  _dl_map_segments (struct link_map *l, int fd,
 
       _dl_postprocess_loadcmd (l, header, c);
 
+      ++c;
+    }
+
+  /* Notify ELF_PREFERRED_ADDRESS that we have to load this one
+     fixed.  */
+  ELF_FIXED_ADDRESS (loader, c->mapstart);
+
+  return NULL;
+}
+
+static __always_inline const char *
+_dl_finalize_segments (struct link_map *l, int type,
+                       const struct loadcmd loadcmds[], size_t nloadcmds)
+{
+  const struct loadcmd *c = loadcmds;
+
+  while (c < &loadcmds[nloadcmds])
+    {
+      ElfW(Addr) hole_start, hole_size;
+
+      if (c->mapend > c->mapstart)
+        {
+          if (__mprotect ((void *) (l->l_addr + c->mapstart),
+                      c->mapend - c->mapstart, c->prot) < 0)
+            return DL_MAP_SEGMENTS_ERROR_MPROTECT;
+
+        }
+
       if (c->allocend > c->dataend)
         {
           /* Extra zero pages should appear at the end of this segment,
@@ -208,9 +234,5 @@  _dl_map_segments (struct link_map *l, int fd,
       ++c;
     }
 
-  /* Notify ELF_PREFERRED_ADDRESS that we have to load this one
-     fixed.  */
-  ELF_FIXED_ADDRESS (loader, c->mapstart);
-
   return NULL;
 }