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.
12 lines
324 B
C
12 lines
324 B
C
#include <stdint.h>
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#define STACK_CHK_GUARD \
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({ uintptr_t x; \
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asm ("mov %%fs:%c1, %0" : "=r" (x) \
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: "i" (offsetof (tcbhead_t, stack_guard))); x; })
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#define POINTER_CHK_GUARD \
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({ uintptr_t x; \
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asm ("mov %%fs:%c1, %0" : "=r" (x) \
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: "i" (offsetof (tcbhead_t, pointer_guard))); x; })
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