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/** |
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* @file memset_s.c |
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* @version 950bba4 (HEAD -> master) |
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* |
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* Secure memset api that will not be optimized out by compiler. |
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*/ |
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/* |
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* Copyright (c) 2013-2017 INSIDE Secure Corporation |
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* Copyright (c) PeerSec Networks, 2002-2011 |
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* All Rights Reserved |
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* |
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* The latest version of this code is available at http://www.matrixssl.org |
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* |
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* This software is open source; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This General Public License does NOT permit incorporating this software |
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* into proprietary programs. If you are unable to comply with the GPL, a |
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* commercial license for this software may be purchased from INSIDE at |
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* http://www.insidesecure.com/ |
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* |
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* This program is distributed in WITHOUT ANY WARRANTY; without even the |
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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* See the GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* http://www.gnu.org/copyleft/gpl.html |
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*/ |
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/******************************************************************************/ |
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/** |
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Implementation of C11 API for platforms that do not have it. |
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In contrast to the memset(3) function, calls to memset_s() will never be |
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"optimised away" by a compiler. This property is required by the follow- |
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ing sentences in section K.3.7.4.1 of ISO/IEC 9899:2011 ("ISO C11"): |
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Unlike memset(), any call to the memset_s() function shall be evalu- |
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ated strictly according to the rules of the abstract machine as |
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described in (5.1.2.3). That is, any call to the memset_s() function |
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shall assume that the memory indicated by s and n may be accessible |
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in the future and thus must contain the values indicated by c. |
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On Mac OS X, this api is natively implemented. |
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On Windows, this api is mapped to SecureZeroMemory() |
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*/ |
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#if !defined(_WIN32) && !defined(__APPLE__) |
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# ifdef __OPTIMIZE__ |
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# pragma GCC diagnostic push |
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# pragma GCC diagnostic ignored "-Wpragmas" |
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# pragma GCC push_options |
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# pragma GCC optimize("O0") |
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# ifdef __clang__ |
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# define NO_OPTIM \ |
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__attribute__((__noinline__)) __attribute__((__optnone__)) |
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# else |
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# define NO_OPTIM \ |
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__attribute__((__noinline__)) __attribute__((__optimize__("O0"))) |
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# endif |
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# else |
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# define NO_OPTIM /* Unrecognized compiler or not optimizing. */ |
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# endif |
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# include |
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typedef size_t rsize_t; |
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typedef int errno_t; |
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17264025
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errno_t NO_OPTIM memset_s(void *s, rsize_t smax, int c, rsize_t n) |
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{ |
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17264025
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if (n > smax) |
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{ |
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0
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n = smax; |
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} |
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17264025
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memset(s, c, n); |
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17264025
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return ((unsigned char volatile *) s)[0]; |
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} |
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83
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# ifdef __OPTIMIZE__ |
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# pragma GCC pop_options |
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# pragma GCC diagnostic pop |
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# endif |
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# undef NO_OPTIM |
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89
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#endif /* !WIN && ! APPLE */ |
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91
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/******************************************************************************/ |