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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/126203/">https://git.reviewboard.kde.org/r/126203/</a>
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<p style="margin-top: 0;">On November 30th, 2015, 9:34 a.m. CET, <b>Tobias Berner</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I think FreeBSD 10 introduced a similar interface in r277322
https://svnweb.freebsd.org/base?view=revision&revision=277322
Though it is explicitely stated to not be a "security feature".</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">According to the man page of progctl
https://www.freebsd.org/cgi/man.cgi?query=procctl&apropos=0&sektion=2&manpath=FreeBSD+10.2-RELEASE&arch=default&format=html
this would be PROC_TRACE_CTL with data PROC_TRACE_CTL_DISABLE.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I will have to ask someone more familiar with that.</p></pre>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><blockquote style="text-rendering: inherit;padding: 0 0 0 1em;border-left: 1px solid #bbb;white-space: normal;margin: 0 0 0 0.5em;line-height: inherit;">
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">how do I get kwin to output the debug output for the framebuffer backend, with qcdebug lines,</p>
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<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Given the notes on it, that seems fine. It's not my intention to protect against kernel or root.</p></pre>
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<p>- Martin</p>
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<p>On November 30th, 2015, 9:01 a.m. CET, Martin Gräßlin wrote:</p>
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<div>Review request for Plasma and Tobias Berner.</div>
<div>By Martin Gräßlin.</div>
<p style="color: grey;"><i>Updated Nov. 30, 2015, 9:01 a.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
kscreenlocker
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Setting the PR_SET_DUMPABLE flag to 0 for the security relevant
command kcheckpass and kscreenlocker_greet. If one wants to gdb into
the running command it will result in:</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">ptrace: Operation not permitted.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">For kscreenlocker_greet ptrace is permitted in testing mode.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">As root it's still possible to attach to the process.</p>
<hr style="text-rendering: inherit;margin: 0;padding: 0;white-space: normal;border: 1px solid #ddd;line-height: inherit;" />
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">@Tobias: I assume this is a strong linux-ism. Is there a FreeBSD compareable functionality?</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I'm considering to push this explicitly without an ifdef. It's a new security feature and I want to make non-Linux systems aware of the fact that it adds a new feature and that a replacement should be added.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Tried to gdb into the processes: failed
Tried to gdb into kscreenlocker_greet --testing: succeeded
Tried to gdb into kscreenlocker_greet as root: succeeded</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>greeter/main.cpp <span style="color: grey">(e4e679e7ef40b319665428281fdba5f4e0b4eb25)</span></li>
<li>kcheckpass/kcheckpass.c <span style="color: grey">(fd2d2215bf2199f159a121bb0ce08e7b2b254aaa)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/126203/diff/" style="margin-left: 3em;">View Diff</a></p>
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