mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
c61b4d41c9
The pointer guard used for pointer mangling was not initialized for static applications resulting in the security feature being disabled. The pointer guard is now correctly initialized to a random value for static applications. Existing static applications need to be recompiled to take advantage of the fix. The test tst-ptrguard1-static and tst-ptrguard1 add regression coverage to ensure the pointer guards are sufficiently random and initialized to a default value.
13 lines
293 B
C
13 lines
293 B
C
#include <stdint.h>
|
|
|
|
#define STACK_CHK_GUARD \
|
|
({ uintptr_t x; asm ("movl %%gs:0x14, %0" : "=r" (x)); x; })
|
|
|
|
#define POINTER_CHK_GUARD \
|
|
({ \
|
|
uintptr_t x; \
|
|
asm ("movl %%gs:%c1, %0" : "=r" (x) \
|
|
: "i" (offsetof (tcbhead_t, pointer_guard))); \
|
|
x; \
|
|
})
|