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mm/kasan: fix kasan false positives

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When using memset via __asan_storeN check, not checking if all memory is accessible

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>
This commit is contained in:
yinshengkai 2024-03-22 15:41:31 +08:00 • committed by Xiang Xiao
parent 30652291b5
commit e0c8189818
1 changed files with 35 additions and 1 deletions
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36
mm/kasan/generic.c
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@ -202,9 +202,43 @@ bool kasan_is_poisoned(FAR const void *addr, size_t size)
{
FAR uintptr_t *p;
unsigned int bit;
unsigned int nbit;
uintptr_t mask;
p = kasan_mem_to_shadow(addr, size, &bit);
return p && ((*p >> bit) & 1);
if (p == NULL)
{
return false;
}
nbit = KASAN_BITS_PER_WORD - bit % KASAN_BITS_PER_WORD;
mask = KASAN_FIRST_WORD_MASK(bit);
size /= KASAN_SHADOW_SCALE;
while (size >= nbit)
{
if ((*p++ & mask) != 0)
{
return true;
}
bit += nbit;
size -= nbit;
nbit = KASAN_BITS_PER_WORD;
mask = UINTPTR_MAX;
}
if (size)
{
mask &= KASAN_LAST_WORD_MASK(bit + size);
if ((*p & mask) != 0)
{
return true;
}
}
return false;
}
void kasan_poison(FAR const void *addr, size_t size)