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Merge pull request #733 from gabor-mezei-arm/689_bp27_zeroising_of_plaintext_buffers

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[Backport 2.7] Zeroising of plaintext buffers in mbedtls_ssl_read()
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Gilles Peskine 2020-08-12 18:51:47 +02:00 committed by GitHub
parent cd542a5453 0e6f3b7661
commit 691bed7cce
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4
ChangeLog.d/zeroising_of_plaintext_buffer.txt Normal file
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@ -0,0 +1,4 @@
Security
* Zeroising of plaintext buffers in mbedtls_ssl_read() to erase unused
application data from memory. Reported in #689 by
Johan Uppman Bruce of Sectra.

4
library/ssl_tls.c
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@ -7407,6 +7407,10 @@ int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
memcpy( buf, ssl->in_offt, n );
ssl->in_msglen -= n;
/* Zeroising the plaintext buffer to erase unused application data
from the memory. */
mbedtls_zeroize( ssl->in_offt, n );
if( ssl->in_msglen == 0 )
{
/* all bytes consumed */