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27 lines
797 B
27 lines
797 B
#include <string.h>
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#include <stdint.h>
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#include "pthread_impl.h"
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#include "atomic.h"
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uintptr_t __stack_chk_guard;
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void __init_ssp(void *entropy)
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{
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/* Here the thread pointer is used without checking whether
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* it is available; this will crash if it's not. However,
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* this function is only meant to be called if the program
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* being run uses stack protector, and in that case, it would
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* crash without a thread pointer anyway, so it's better to
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* crash early before there is state to be lost on crash. */
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pthread_t self = __pthread_self();
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uintptr_t canary;
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if (entropy) memcpy(&canary, entropy, sizeof canary);
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else canary = (uintptr_t)&canary * 1103515245;
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a_cas_l(&__stack_chk_guard, 0, canary);
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self->canary = __stack_chk_guard;
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}
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void __stack_chk_fail(void)
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{
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a_crash();
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}
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