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>
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#define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("movl %%gs:0x14, %0" : "=r" (x)); x; })
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#define POINTER_CHK_GUARD \
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({ \
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uintptr_t x; \
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asm ("movl %%gs:%c1, %0" : "=r" (x) \
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: "i" (offsetof (tcbhead_t, pointer_guard))); \
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x; \
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})
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