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Replace __libc_multiple_libcs with __libc_initial flag

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Change sbrk to fail for !__libc_initial (in the generic
implementation).  As a result, sbrk is (relatively) safe to use
for the __libc_initial case (from the main libc).  It is therefore
no longer necessary to avoid using it in that case (or updating the
brk cache), and the __libc_initial flag does not need to be updated
as part of dlmopen or static dlopen.

As before, direct brk system calls on Linux may lead to memory
corruption.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2020-12-16 15:09:52 +01:00
parent 9459fe9da0
commit e7570f4131
9 changed files with 52 additions and 39 deletions
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6
elf/dl-open.c
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@ -787,12 +787,6 @@ dl_open_worker (void *a)
if (mode & RTLD_GLOBAL)
add_to_global_update (new);
#ifndef SHARED
/* We must be the static _dl_open in libc.a. A static program that
has loaded a dynamic object now has competition. */
__libc_multiple_libcs = 1;
#endif
/* Let the user know about the opencount. */
if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
_dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",