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mbedtls_to_psa_error: prefer dispatching on the low-level error

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When an Mbed TLS error code combines a low-level error and a
high-level error, the low-level error is usually closer to the root
cause (for example HW_ACCEL_FAILED or ENTROPY_SOURCE_FAILED is more
informative than RSA_PRIVATE_FAILED). So prioritize the low-level code
when converting to a PSA error code, rather than the high-level code
as was (rather arbitrarily) done before.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-01-06 20:04:23 +01:00
parent 1631514b8e
commit dbf6896c82
1 changed files with 5 additions and 3 deletions
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8
library/psa_crypto.c
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@ -135,9 +135,11 @@ mbedtls_psa_drbg_context_t *const mbedtls_psa_random_state =
psa_status_t mbedtls_to_psa_error( int ret )
{
/* If there's both a high-level code and low-level code, dispatch on
* the high-level code. */
switch( ret < -0x7f ? - ( -ret & 0x7f80 ) : ret )
/* Mbed TLS error codes can combine a high-level error code and a
* low-level error code. The low-level error usually reflects the
* root cause better, so dispatch on that preferably. */
int low_level_ret = - ( -ret & 0x007f );
switch( low_level_ret != 0 ? low_level_ret : ret )
{
case 0:
return( PSA_SUCCESS );