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mm/sw_tags: add config for no longer checking for tags 0 #14114

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merged 1 commit into from
Oct 12, 2024
Merged

mm/sw_tags: add config for no longer checking for tags 0 #14114

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6 changes: 6 additions & 0 deletions mm/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -326,6 +326,12 @@ config MM_KASAN_DISABLE_WRITES_CHECK
---help---
This option disable kasan writes check.

config MM_KASAN_SKIP_ZERO_TAGS
bool "Enable skip check zero tags"
default LIBC_MODLIB
---help---
This option enables not checking for zero tags.

config MM_KASAN_GLOBAL
bool "Enable global data check"
depends on MM_KASAN_ALL
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10 changes: 9 additions & 1 deletion mm/kasan/sw_tags.c
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Expand Up @@ -43,7 +43,7 @@
(FAR void *)((((uint64_t)(addr)) & ~((uint64_t)0xff << KASAN_TAG_SHIFT)) | \
(((uint64_t)(tag)) << KASAN_TAG_SHIFT))

#define kasan_random_tag() (rand() % ((1 << (64 - KASAN_TAG_SHIFT)) - 1))
#define kasan_random_tag() (1 + rand() % ((1 << (64 - KASAN_TAG_SHIFT)) - 2))

#define KASAN_SHADOW_SCALE (sizeof(uintptr_t))

Expand Down Expand Up @@ -103,6 +103,14 @@ kasan_is_poisoned(FAR const void *addr, size_t size)
uint8_t tag;

tag = kasan_get_tag(addr);

#ifdef CONFIG_MM_KASAN_SKIP_ZERO_TAGS
if (tag == 0)
{
return false;
}
#endif

p = kasan_mem_to_shadow(addr, size);
if (p == NULL)
{
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