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Add underflow check to UNPOISON counter decrement

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Make sure that extra UNPOISON calls do not cause the poisoning counter
to underflow and wrap around.

Memory that is unpoisoned multiple times should remain unpoisoned.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
This commit is contained in:
David Horstmann
2024-01-17 15:27:50 +00:00
parent 1b421b1005
commit e7bfbc27bf
1 changed files with 3 additions and 1 deletions
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4
tests/include/test/memory.h
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@ -93,7 +93,9 @@ void mbedtls_test_memory_unpoison(const unsigned char *ptr, size_t size);
#define MBEDTLS_TEST_MEMORY_UNPOISON(ptr, size) \
do { \
mbedtls_test_memory_unpoison(ptr, size); \
mbedtls_test_memory_poisoning_count--; \
if (mbedtls_test_memory_poisoning_count != 0) { \
mbedtls_test_memory_poisoning_count--; \
} \
} while (0)
#else /* MBEDTLS_TEST_MEMORY_CAN_POISON */