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Make psa_purge_key thread safe

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Relies on get_and_lock_X being thread safe.
There are two mutex locks here, one in psa_get_and_lock...
Linearization point is the final unlock (or first lock on failure).

Signed-off-by: Ryan Everett <ryan.everett@arm.com>
This commit is contained in:
Ryan Everett 2024-01-24 11:42:32 +00:00
parent f23336e040
commit b0821959ae
1 changed files with 12 additions and 2 deletions
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14
library/psa_crypto_slot_management.c
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@ -564,12 +564,22 @@ psa_status_t psa_purge_key(mbedtls_svc_key_id_t key)
return status;
}
#if defined(MBEDTLS_THREADING_C)
PSA_THREADING_CHK_RET(mbedtls_mutex_lock(
&mbedtls_threading_key_slot_mutex));
#endif
if ((!PSA_KEY_LIFETIME_IS_VOLATILE(slot->attr.lifetime)) &&
(slot->registered_readers == 1)) {
return psa_wipe_key_slot(slot);
status = psa_wipe_key_slot(slot);
} else {
return psa_unregister_read(slot);
status = psa_unregister_read(slot);
}
#if defined(MBEDTLS_THREADING_C)
PSA_THREADING_CHK_RET(mbedtls_mutex_unlock(
&mbedtls_threading_key_slot_mutex));
#endif
return status;
}
void mbedtls_psa_get_stats(mbedtls_psa_stats_t *stats)