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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.
15 lines
382 B
C
15 lines
382 B
C
#include <stdint.h>
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#define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("lwz %0,-28680(2)" : "=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 ("lwz %0,%1(2)" \
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: "=r" (x) \
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: "i" (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t)) \
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); \
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x; \
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})
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