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Add macro for error code addition

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Adds a macro (`MBEDTLS_ERR_ADD`) to add error codes together and check that the
result will not be corrupted. This additional check is only enabled during
testing when `MBEDTLS_TEST_HOOKS` is defined.

Also includes a reference usage example in `rsa.c` where two high-level error
codes could be incorrectly added together under the right conditions. This now
ensures that when this error occurs during testing it will be correctly
reported.

Signed-off-by: Chris Jones <christopher.jones@arm.com>
This commit is contained in:
Chris Jones 2021-01-08 17:04:59 +00:00
parent 528b0a6b18
commit 96ae73b0ea
6 changed files with 49 additions and 1 deletions
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10
include/mbedtls/error.h
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@ -114,6 +114,16 @@ extern "C" {
#define MBEDTLS_ERR_ERROR_GENERIC_ERROR -0x0001 /**< Generic error */
#define MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED -0x006E /**< This is a bug in the library */
#if defined(MBEDTLS_TEST_HOOKS)
void (*mbedtls_test_err_add_hook)( int, int, const char *, int );
int mbedtls_err_add( int high, int low, const char *file, int line );
#define MBEDTLS_ERR_ADD( high, low ) \
( mbedtls_err_add( high, low, __FILE__, __LINE__ ) )
#else
#define MBEDTLS_ERR_ADD( high, low ) \
( high + low )
#endif
/**
* \brief Translate a mbed TLS error code into a string representation,
* Result is truncated if necessary and always includes a terminating