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Splitting buffers comment added

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Signed-off-by: Shelly Liberman <shelly.liberman@arm.com>
This commit is contained in:
Shelly Liberman 2020-08-05 15:52:58 +03:00
parent c6a7e6b0c4
commit 3799fc1578
1 changed files with 11 additions and 3 deletions
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8
library/ssl_tls.c
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@ -11272,6 +11272,10 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
mbedtls_platform_memcpy( ssl->out_msg, buf, len ); mbedtls_platform_memcpy( ssl->out_msg, buf, len );
#if defined(MBEDTLS_FI_COUNTERMEASURES) && !defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) #if defined(MBEDTLS_FI_COUNTERMEASURES) && !defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
/*
* Buffer pointer and size duplication cannot be supported with MBEDTLS_SSL_CBC_RECORD_SPLITTING.
* After splitting pointers and data size will not be the same as initaly provides by user.
*/
/* Secure against buffer substitution */ /* Secure against buffer substitution */
if( buf == ssl->out_msg_dup && if( buf == ssl->out_msg_dup &&
ssl->out_msglen == ssl->out_msglen_dup && ssl->out_msglen == ssl->out_msglen_dup &&
@ -11350,6 +11354,10 @@ int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_
{ {
int ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED; int ret = MBEDTLS_ERR_PLATFORM_FAULT_DETECTED;
#if defined(MBEDTLS_FI_COUNTERMEASURES) && !defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) #if defined(MBEDTLS_FI_COUNTERMEASURES) && !defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
/*
* Buffer pointer and size duplication cannot be supported with MBEDTLS_SSL_CBC_RECORD_SPLITTING.
* After splitting pointers and data size will not be the same as initaly provides by user.
*/
volatile const unsigned char *buf_dup = buf; volatile const unsigned char *buf_dup = buf;
volatile size_t len_dup = len; volatile size_t len_dup = len;
#endif #endif