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/**
* \file memory.c
*
* \brief Helper functions related to testing memory management.
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include <test/helpers.h>
#include <test/macros.h>
#include <test/memory.h>
#if defined(MBEDTLS_TEST_MEMORY_CAN_POISON)
#include <sanitizer/asan_interface.h>
#include <stdint.h>
#endif
#if defined(MBEDTLS_TEST_MEMORY_CAN_POISON)
_Thread_local unsigned int mbedtls_test_memory_poisoning_count = 0;
static void align_for_asan(const unsigned char **p_ptr, size_t *p_size)
{
uintptr_t start = (uintptr_t) *p_ptr;
uintptr_t end = start + (uintptr_t) *p_size;
/* ASan can only poison regions with 8-byte alignment, and only poisons a
* region if it's fully within the requested range. We want to poison the
* whole requested region and don't mind a few extra bytes. Therefore,
* align start down to an 8-byte boundary, and end up to an 8-byte
* boundary. */
start = start & ~(uintptr_t) 7;
end = (end + 7) & ~(uintptr_t) 7;
*p_ptr = (const unsigned char *) start;
*p_size = end - start;
}
void mbedtls_test_memory_poison(const unsigned char *ptr, size_t size)
{
if (mbedtls_test_memory_poisoning_count == 0) {
return;
}
if (size == 0) {
return;
}
align_for_asan(&ptr, &size);
__asan_poison_memory_region(ptr, size);
}
void mbedtls_test_memory_unpoison(const unsigned char *ptr, size_t size)
{
if (size == 0) {
return;
}
align_for_asan(&ptr, &size);
__asan_unpoison_memory_region(ptr, size);
}
#endif /* Memory poisoning */
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