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android: add function for disabling MTE at runtime

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On Android, MTE is always enabled in Zygote, and is disabled after fork for apps that didn't opt-in
to MTE.

Depends on the slab canary adjustments in the previous commit.
This commit is contained in:
Dmitry Muhomor 2023-10-26 10:22:55 +03:00
parent 597d0c3064
commit 3ebcc4c8f5
2 changed files with 9 additions and 0 deletions
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8
h_malloc.c
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@ -2148,3 +2148,11 @@ COLD EXPORT int h_malloc_set_state(UNUSED void *state) {
return -2;
}
#endif
#ifdef __ANDROID__
COLD EXPORT void h_malloc_disable_memory_tagging(void) {
#ifdef HAS_ARM_MTE
__is_memtag_enabled = false;
#endif
}
#endif

1
include/h_malloc.h
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@ -99,6 +99,7 @@ int h_malloc_iterate(uintptr_t base, size_t size, void (*callback)(uintptr_t ptr
void *arg);
void h_malloc_disable(void);
void h_malloc_enable(void);
void h_malloc_disable_memory_tagging(void);
#endif
// hardened_malloc extensions