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Add the ability to verify mbedtls_platform_zeroize() calls with -Wsizeof-pointer-memaccess

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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove 2023-09-01 09:53:42 +01:00
parent 4f69668558
commit 42b02a909c
1 changed files with 21 additions and 0 deletions
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21
include/mbedtls/platform_util.h
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@ -167,7 +167,28 @@ MBEDTLS_DEPRECATED typedef int mbedtls_deprecated_numeric_constant_t;
* \param len Length of the buffer in bytes
*
*/
#if defined(MBEDTLS_PLATFORM_ZEROIZE_CHECK_UNSAFE)
#define MBEDTLS_PLATFORM_ZEROIZE_ALT
#define mbedtls_platform_zeroize(buf, len) memset(buf, 0, len)
#include <string.h>
#else
void mbedtls_platform_zeroize(void *buf, size_t len);
#endif
/* MBEDTLS_PLATFORM_ZEROIZE_CHECK_UNSAFE
*
* Replaces calls to mbedtls_platform_zeroize() with calls to memset(),
* to allow compiler analysis to check for invalid length arguments (e.g.
* specifying sizeof(pointer) rather than sizeof(pointee)).
*
* Note that this option is meant for internal use only and must not be used
* in production builds, because that would lead to zeroization calls being
* optimised out by the compiler.
*
* It is only intended to be used in CFLAGS, with -Wsizeof-pointer-memaccess,
* to check for those incorrect calls to mbedtls_platform_zeroize().
*/
//#define MBEDTLS_PLATFORM_ZEROIZE_CHECK_UNSAFE
#if defined(MBEDTLS_HAVE_TIME_DATE)
/**