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Improve alloca() memory safety

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Now that all the bugs have been wormed out of the ASAN memory module we
can successfully check for underruns on large stack allocations.
This commit is contained in:
Justine Tunney 2022-04-01 22:44:43 -07:00
parent 1ff1854107
commit 38cb6e71ca
4 changed files with 10 additions and 13 deletions
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3
libc/intrin/asan.c
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@ -1240,8 +1240,7 @@ void __asan_unpoison_stack_memory(uintptr_t addr, size_t size) {
}
void __asan_alloca_poison(uintptr_t addr, size_t size) {
/* TODO(jart): Make sense of this function. */
/* __asan_poison(addr - 32, 32, kAsanAllocaUnderrun); */
__asan_poison(addr - 32, 32, kAsanAllocaUnderrun);
__asan_poison(ROUNDUP(addr + size, 32), 32, kAsanAllocaOverrun);
__asan_unpoison(addr, ROUNDUP(addr + size, 32) - (addr + size) + 32 + size);
}