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Fix CTR_DRBG benchmark

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You can't reuse a CTR_DRBG context without free()ing it and
re-init()ing. This generally happened to work, but was never
guaranteed. It could have failed with alternative implementations of
the AES module because mbedtls_ctr_drbg_seed() calls
mbedtls_aes_init() on a context which is already initialized if
mbedtls_ctr_drbg_seed() hasn't been called before, plausibly causing a
memory leak. Calling free() and seed() with no intervening init fails
when MBEDTLS_THREADING_C is enabled and all-bits-zero is not a valid
mutex representation. So add the missing free() and init().
This commit is contained in:
Gilles Peskine 2019-10-28 17:28:46 +01:00 committed by Simon Butcher
parent d69ae8c21d
commit 216040d46f
1 changed files with 2 additions and 1 deletions
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3
programs/test/benchmark.c
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@ -686,12 +686,13 @@ int main( int argc, char *argv[] )
mbedtls_ctr_drbg_context ctr_drbg; mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ctr_drbg_init( &ctr_drbg ); mbedtls_ctr_drbg_init( &ctr_drbg );
if( mbedtls_ctr_drbg_seed( &ctr_drbg, myrand, NULL, NULL, 0 ) != 0 ) if( mbedtls_ctr_drbg_seed( &ctr_drbg, myrand, NULL, NULL, 0 ) != 0 )
mbedtls_exit(1); mbedtls_exit(1);
TIME_AND_TSC( "CTR_DRBG (NOPR)", TIME_AND_TSC( "CTR_DRBG (NOPR)",
mbedtls_ctr_drbg_random( &ctr_drbg, buf, BUFSIZE ) ); mbedtls_ctr_drbg_random( &ctr_drbg, buf, BUFSIZE ) );
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_ctr_drbg_init( &ctr_drbg );
if( mbedtls_ctr_drbg_seed( &ctr_drbg, myrand, NULL, NULL, 0 ) != 0 ) if( mbedtls_ctr_drbg_seed( &ctr_drbg, myrand, NULL, NULL, 0 ) != 0 )
mbedtls_exit(1); mbedtls_exit(1);
mbedtls_ctr_drbg_set_prediction_resistance( &ctr_drbg, MBEDTLS_CTR_DRBG_PR_ON ); mbedtls_ctr_drbg_set_prediction_resistance( &ctr_drbg, MBEDTLS_CTR_DRBG_PR_ON );