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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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13
tests/src/helpers.c
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@ -282,3 +282,16 @@ void mbedtls_param_failed( const char *failure_condition,
}
}
#endif /* MBEDTLS_CHECK_PARAMS */
#if defined(MBEDTLS_TEST_HOOKS)
void mbedtls_test_err_add_check( int high, int low,
const char *file, int line )
{
if ( high < -0x0FFF && low > -0x007F )
{
mbedtls_fprintf( stderr, "\nIncorrect error code addition at %s:%d\n",
file, line );
mbedtls_exit( 1 );
}
}
#endif /* MBEDTLS_TEST_HOOKS */