yuzu/mbedtls
1
0
Fork 0
mirror of https://github.com/yuzu-emu/mbedtls.git synced 2025-01-12 17:45:42 +00:00
Code Issues Packages Projects Releases Wiki Activity

psa: cipher: Fix invalid output buffer usage in psa_cipher_generate_iv()

Browse source 
Don't use the output buffer in psa_cipher_generate_iv()
to pass the generated IV to the driver as local
attacker could potentially control it.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2021-07-05 12:31:44 +02:00
parent 6fbc057786
commit c423acbe0f
1 changed files with 17 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
library/psa_crypto.c
View file

@ -3379,8 +3379,8 @@ psa_status_t psa_cipher_generate_iv( psa_cipher_operation_t *operation,
size_t *iv_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
*iv_length = 0;
uint8_t local_iv[PSA_CIPHER_IV_MAX_SIZE];
size_t default_iv_length;
if( operation->id == 0 )
{
@ -3394,28 +3394,38 @@ psa_status_t psa_cipher_generate_iv( psa_cipher_operation_t *operation,
goto exit;
}
if( iv_size < operation->default_iv_length )
default_iv_length = operation->default_iv_length;
if( iv_size < default_iv_length )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
status = psa_generate_random( iv, operation->default_iv_length );
if( default_iv_length > PSA_CIPHER_IV_MAX_SIZE )
{
status = PSA_ERROR_GENERIC_ERROR;
goto exit;
}
status = psa_generate_random( local_iv, default_iv_length );
if( status != PSA_SUCCESS )
goto exit;
status = psa_driver_wrapper_cipher_set_iv( operation,
iv,
operation->default_iv_length );
local_iv, default_iv_length );
exit:
if( status == PSA_SUCCESS )
{
memcpy( iv, local_iv, default_iv_length );
*iv_length = default_iv_length;
operation->iv_set = 1;
*iv_length = operation->default_iv_length;
}
else
{
*iv_length = 0;
psa_cipher_abort( operation );
}
return( status );
}