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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-02-24 17:43:00 +00:00
parent f55182d2bf
commit 4daca63734
1 changed files with 9 additions and 4 deletions
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13
library/platform_util.c
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@ -56,7 +56,12 @@
#if !defined(MBEDTLS_PLATFORM_ZEROIZE_ALT)
/*
* This implementation should never be optimized out by the compiler
* Where possible, we try to detect the presence of a platform-provided
* secure memset, such as explicit_bzero(), that is safe against being optimized
* out, and use that.
*
* For other platforms, we provide an implementation that aims not to be
* optimized out by the compiler.
*
* This implementation for mbedtls_platform_zeroize() was inspired from Colin
* Percival's blog article at:
@ -71,11 +76,11 @@
* (refer to http://www.daemonology.net/blog/2014-09-05-erratum.html for
* details), optimizations of the following form are still possible:
*
* if( memset_func != memset )
* memset_func( buf, 0, len );
* if(memset_func != memset)
* memset_func(buf, 0, len);
*
* Note that it is extremely difficult to guarantee that
* mbedtls_platform_zeroize() will not be optimized out by aggressive compilers
* the memset() call will not be optimized out by aggressive compilers
* in a portable way. For this reason, Mbed TLS also provides the configuration
* option MBEDTLS_PLATFORM_ZEROIZE_ALT, which allows users to configure
* mbedtls_platform_zeroize() to use a suitable implementation for their