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psa: Do not reset a key slot under access

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When psa_close/destroy/purge_key is called, do not
reset a key slot containing the description
of a persistent key if it is currently accessed.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2020-10-29 17:51:10 +01:00
parent ddd3d05803
commit f291111007
2 changed files with 28 additions and 4 deletions
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20
library/psa_crypto.c
View file

@ -1344,10 +1344,30 @@ psa_status_t psa_destroy_key( mbedtls_svc_key_id_t key )
if( mbedtls_svc_key_id_is_null( key ) )
return( PSA_SUCCESS );
/*
* Get the description of the key in a key slot. In case of a permanent
* key, this will load the key description from persistent memory if not
* done yet. We cannot avoid this loading as without it we don't know if
* the key is operated by an SE or not and this information is needed by
* the current implementation.
*/
status = psa_get_key_slot( key, &slot );
if( status != PSA_SUCCESS )
return( status );
/*
* If the key slot containing the key description is under access by the
* library (apart from the present access), the key cannot be destroyed
* yet. For the time being, just return in error. Eventually (to be
* implemented), the key should be destroyed when all accesses have
* stopped.
*/
if( slot->access_count > 1 )
{
psa_decrement_key_slot_access_count( slot );
return( PSA_ERROR_GENERIC_ERROR );
}
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
driver = psa_get_se_driver_entry( slot->attr.lifetime );
if( driver != NULL )

12
library/psa_crypto_slot_management.c
View file

@ -382,7 +382,10 @@ psa_status_t psa_close_key( psa_key_handle_t handle )
if( status != PSA_SUCCESS )
return( status );
return( psa_wipe_key_slot( slot ) );
if( slot->access_count <= 1 )
return( psa_wipe_key_slot( slot ) );
else
return( psa_decrement_key_slot_access_count( slot ) );
}
psa_status_t psa_purge_key( mbedtls_svc_key_id_t key )
@ -394,10 +397,11 @@ psa_status_t psa_purge_key( mbedtls_svc_key_id_t key )
if( status != PSA_SUCCESS )
return( status );
if( PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) )
if( ( ! PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) ) &&
( slot->access_count <= 1 ) )
return( psa_wipe_key_slot( slot ) );
else
return( psa_decrement_key_slot_access_count( slot ) );
return( psa_wipe_key_slot( slot ) );
}
void mbedtls_psa_get_stats( mbedtls_psa_stats_t *stats )