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Fix data loss in unsigned int cast in PK

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This patch introduces some additional checks in the PK module for 64-bit
systems only. The problem is that the API functions in the PK
abstraction accept a size_t value for the hashlen, while the RSA module
accepts an unsigned int for the hashlen. Instead of silently casting
size_t to unsigned int, this change checks whether the hashlen overflows
an unsigned int and returns an error.
This commit is contained in:
Andres AG
2017-01-19 11:24:33 +00:00
committed by Simon Butcher
parent b65c2be5f1
commit 72849877d0
2 changed files with 28 additions and 1 deletions
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11
library/pk.c
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@ -29,6 +29,8 @@
#include "mbedtls/pk.h"
#include "mbedtls/pk_internal.h"
#include "mbedtls/bignum.h"
#if defined(MBEDTLS_RSA_C)
#include "mbedtls/rsa.h"
#endif
@ -39,6 +41,8 @@
#include "mbedtls/ecdsa.h"
#endif
#include <limits.h>
/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
@ -209,6 +213,11 @@ int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
int ret;
const mbedtls_pk_rsassa_pss_options *pss_opts;
#if defined(MBEDTLS_HAVE_INT64)
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_HAVE_INT64 */
if( options == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
@ -232,7 +241,7 @@ int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
return( 0 );
#else
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
#endif
#endif /* MBEDTLS_RSA_C && MBEDTLS_PKCS1_V21 */
}
/* General case: no options */