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Prevent compiler to optiize-out memset for on-stack variables.

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Also see
https://cryptocoding.net/index.php/Coding_rules#Prevent_compiler_interference_with_security-critical_operations

The used code is inspired by the code in Blake2 implementation.
This commit is contained in:
Milan Broz
2015-01-11 20:26:45 +01:00
parent dc40b91cdf
commit f7b61b2617
12 changed files with 51 additions and 31 deletions
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7
lib/crypto_backend/crypto_backend.h
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@@ -102,4 +102,11 @@ int crypt_storage_decrypt(struct crypt_storage *ctx, uint64_t sector,
int crypt_storage_encrypt(struct crypt_storage *ctx, uint64_t sector,
size_t count, char *buffer);
/* Memzero helper (memset on stack can be optimized out) */
static inline void crypt_backend_memzero(void *s, size_t n)
{
volatile uint8_t *p = (volatile uint8_t *)s;
while(n--) *p++ = 0;
}
#endif /* _CRYPTO_BACKEND_H */