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Ensure valid context is used in fuzz_dtlsserver

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A valid ctr_drbg context is now a prerequisite for using dummy_random()

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott 2022-02-14 15:57:11 +00:00
parent 51a7679a8e
commit bb0168144e
1 changed files with 8 additions and 8 deletions
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16
programs/fuzz/fuzz_dtlsserver.c
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@ -44,6 +44,13 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
unsigned char buf[4096];
fuzzBufferOffset_t biomemfuzz;
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_entropy_init( &entropy );
if( mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy, &entropy,
( const unsigned char * ) pers, strlen( pers ) ) != 0 )
goto exit;
if (initialized == 0) {
#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
mbedtls_x509_crt_init( &srvcert );
@ -56,7 +63,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
return 1;
if (mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
mbedtls_test_srv_key_len, NULL, 0,
dummy_random, NULL ) != 0)
dummy_random, &ctr_drbg ) != 0)
return 1;
#endif
dummy_init();
@ -65,15 +72,8 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
}
mbedtls_ssl_init( &ssl );
mbedtls_ssl_config_init( &conf );
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_entropy_init( &entropy );
mbedtls_ssl_cookie_init( &cookie_ctx );
if( mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy, &entropy,
(const unsigned char *) pers, strlen( pers ) ) != 0 )
goto exit;
if( mbedtls_ssl_config_defaults( &conf,
MBEDTLS_SSL_IS_SERVER,
MBEDTLS_SSL_TRANSPORT_DATAGRAM,