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| author | Fangrui Song <maskray@google.com> | 2021-01-11 23:56:32 -0800 |
|---|---|---|
| committer | Fangrui Song <maskray@google.com> | 2021-01-11 23:56:32 -0800 |
| commit | 0b11ca56fe0473a41a6e9cdc5d228c7d1e0d6d72 (patch) | |
| tree | 6d9013a7b236e33deee47f247f71aa60eec06477 /elf/rtld.c | |
| parent | 87d583c6e8cd0e49f64da76636ebeec033298b4d (diff) | |
| download | glibc-maskray/stack_chk_guard.zip glibc-maskray/stack_chk_guard.tar.gz glibc-maskray/stack_chk_guard.tar.bz2 | |
Unconditionally define __stack_chk_guard [BZ #26817]maskray/stack_chk_guard
__stack_chk_guard is currently unavailable on architectures which define
THREAD_SET_STACK_GUARD, so {gcc,clang} -fstack-protector
-mstack-protector-guard=global will fail to link due to the undefined
symbol.
Define __stack_chk_guard to make -mstack-protector-guard=global compiled
user programs work. `#define THREAD_SET_STACK_GUARD` code is moved
outside of `#ifndef __ASSEMBLER__` so that cpp can preprocess
elf/Versions.
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 8 |
1 files changed, 2 insertions, 6 deletions
@@ -154,11 +154,8 @@ unsigned int _dl_skip_args attribute_relro attribute_hidden; #endif rtld_hidden_data_def (_dl_argv) -#ifndef THREAD_SET_STACK_GUARD -/* Only exported for architectures that don't store the stack guard canary - in thread local area. */ +/* Also export to architectures which prefer -mstack-protector-guard=tls. */ uintptr_t __stack_chk_guard attribute_relro; -#endif /* Only exported for architectures that don't store the pointer guard value in thread local area. */ @@ -865,9 +862,8 @@ security_init (void) uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random); #ifdef THREAD_SET_STACK_GUARD THREAD_SET_STACK_GUARD (stack_chk_guard); -#else - __stack_chk_guard = stack_chk_guard; #endif + __stack_chk_guard = stack_chk_guard; /* Set up the pointer guard as well, if necessary. */ uintptr_t pointer_chk_guard |