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<a href="https://gitlab.rtems.org/wmthornton-dev">Wayne Thornton</a>
commented on a
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/687#note_130061">cpukit/include/crypt.h</a>:
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<td class="old_line diff-line-num new" data-linenumber="68" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="88" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;">/* Code to re-introduce the C11 memset_s function</span></span>
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<td class="new_line diff-line-num new" data-linenumber="89" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
89
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;">* which is missing from the RTEMS C11 compiler but which</span></span>
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<td class="new_line diff-line-num new" data-linenumber="90" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
90
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;">* is used in the libcrypt functions to securely erase</span></span>
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<td class="new_line diff-line-num new" data-linenumber="91" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
91
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;">* sensitive data after use. Since the C11 memset_s</span></span>
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<td class="new_line diff-line-num new" data-linenumber="92" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
92
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;">* function is not available we provide our own implementation</span></span>
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<td class="new_line diff-line-num new" data-linenumber="93" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
93
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;">* here. Should the RTEMS C library ever provide</span></span>
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<td class="new_line diff-line-num new" data-linenumber="94" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
94
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;">* a conforming memset_s function this code can be removed.</span></span>
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<td class="new_line diff-line-num new" data-linenumber="95" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
95
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;">*/</span></span>
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<td class="new_line diff-line-num new" data-linenumber="96" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
96
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kr" style="font-weight: 600;">inline</span> <span class="kt" style="color: #445588; font-weight: 600;">void</span> <span class="nf" style="color: #990000; font-weight: 600;">memset_s_rtems</span><span class="p">(</span><span class="kt" style="color: #445588; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">s</span><span class="p">,</span> <span class="kt" style="color: #445588; font-weight: 600;">size_t</span> <span class="n" style="color: #333333;">n</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="97" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
97
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"> <span class="k" style="font-weight: 600;">volatile</span> <span class="kt" style="color: #445588; font-weight: 600;">unsigned</span> <span class="kt" style="color: #445588; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="k" style="font-weight: 600;">volatile</span> <span class="kt" style="color: #445588; font-weight: 600;">unsigned</span> <span class="kt" style="color: #445588; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333333;">s</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="98" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333333;">n</span><span class="o" style="font-weight: 600;">--</span><span class="p">)</span> <span class="p">{</span></span>
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99
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">p</span><span class="o" style="font-weight: 600;">++</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #009999;">0</span><span class="p">;</span></span>
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103
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kr" style="font-weight: 600;">inline</span> <span class="kt" style="color: #445588; font-weight: 600;">void</span> <span class="nf" style="color: #990000; font-weight: 600;">explicit_bzero_rtems</span> <span class="p">(</span><span class="kt" style="color: #445588; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">s</span><span class="p">,</span> <span class="kt" style="color: #445588; font-weight: 600;">size_t</span> <span class="n" style="color: #333333;">len</span><span class="p">)</span></span>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial"><a href="https://gitlab.rtems.org/joel" data-reference-type="user" data-user="7" data-container="body" data-placement="top" class="gfm gfm-project_member js-user-link" title="Joel Sherrill" style="color: #284779; background-color: #cbe2f9; border-radius: .25rem; margin-top: 0; padding: 0 2px;">@joel</a> memset() by itself tends to be optimized away by the compiler which runs the risk of leaving intermediate strings within memory, which could be accessed by outside attackers. By calling the memset_s() function, we force the compiler to leave it in. That being said, I understand your comment that the implementation is inefficient, and perhaps it could be written better. I'll take a look at that.</p>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial"><a href="https://gitlab.rtems.org/gedare" data-reference-type="user" data-user="8" data-container="body" data-placement="top" class="gfm gfm-project_member js-user-link" title="Gedare Bloom" style="color: #284779; background-color: #cbe2f9; border-radius: .25rem; margin-top: 0; padding: 0 2px;">@gedare</a> I'll take a look at this option and see what works.</p>
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