diff options
Diffstat (limited to 'src/env/__stack_chk_fail.c')
| -rw-r--r-- | src/env/__stack_chk_fail.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/src/env/__stack_chk_fail.c b/src/env/__stack_chk_fail.c index 00634d38..87ac473d 100644 --- a/src/env/__stack_chk_fail.c +++ b/src/env/__stack_chk_fail.c @@ -1,24 +1,16 @@ #include <string.h> #include <stdint.h> #include "pthread_impl.h" -#include "atomic.h" uintptr_t __stack_chk_guard; void __init_ssp(void *entropy) { - /* Here the thread pointer is used without checking whether - * it is available; this will crash if it's not. However, - * this function is only meant to be called if the program - * being run uses stack protector, and in that case, it would - * crash without a thread pointer anyway, so it's better to - * crash early before there is state to be lost on crash. */ - pthread_t self = __pthread_self(); - uintptr_t canary; - if (entropy) memcpy(&canary, entropy, sizeof canary); - else canary = (uintptr_t)&canary * 1103515245; - a_cas_l(&__stack_chk_guard, 0, canary); - self->canary = __stack_chk_guard; + if (entropy) memcpy(&__stack_chk_guard, entropy, sizeof(uintptr_t)); + else __stack_chk_guard = (uintptr_t)&__stack_chk_guard * 1103515245; + + if (libc.has_thread_pointer) + __pthread_self()->canary = __stack_chk_guard; } void __stack_chk_fail(void) |