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Prevent loader from loading itself

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Ulrich Drepper
2011-05-30 01:55:40 -04:00
parent 7ae22829af
commit 01f16ab0a5
2 changed files with 12 additions and 0 deletions
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ChangeLog
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@@ -1,3 +1,7 @@
2011-05-30 Ulrich Drepper <drepper@gmail.com>
* elf/rtld.c (dl_main): Don't allow the loader to load itself.
2011-05-29 Ulrich Drepper <drepper@gmail.com> 2011-05-29 Ulrich Drepper <drepper@gmail.com>
[BZ #12350] [BZ #12350]

8
elf/rtld.c
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@@ -1076,6 +1076,14 @@ of this helper program; chances are you did not intend to run this program.\n\
/* Now the map for the main executable is available. */ /* Now the map for the main executable is available. */
main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded; main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
if (GL(dl_rtld_map).l_info[DT_SONAME] != NULL
&& main_map->l_info[DT_SONAME] != NULL
&& strcmp ((const char *) D_PTR (&GL(dl_rtld_map), l_info[DT_STRTAB])
+ GL(dl_rtld_map).l_info[DT_SONAME]->d_un.d_val,
(const char *) D_PTR (main_map, l_info[DT_STRTAB])
+ main_map->l_info[DT_SONAME]->d_un.d_val) == 0)
_dl_fatal_printf ("loader cannot load itself\n");
phdr = main_map->l_phdr; phdr = main_map->l_phdr;
phnum = main_map->l_phnum; phnum = main_map->l_phnum;
/* We overwrite here a pointer to a malloc()ed string. But since /* We overwrite here a pointer to a malloc()ed string. But since