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<a href="https://gitlab.rtems.org/joel">Joel Sherrill</a>
commented on a
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/687#note_130024">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="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="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="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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<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">Newlib does not have memset_s(). But this implementation is inefficient. Couldn't it just call memset() which is often optimized for the architecture?</p>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">FWIW there is an implementation of the Annex K safe functions on github that I asked them to relicense to permissive and they did for what they could. From an RTEMS perspective, we just haven't done anything since then. Long term, it may make sense to talk to the newlib folks and see if building up the set in newlib makes sense. Not this week and not a rejection of a helper here.</p>
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