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#sysctl

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Alfonso Siciliano<p>New post: "WebSysctl is Now Live!"</p><p><a href="https://alfonsosiciliano.gitlab.io/posts/2025-04-26-websysctl.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">alfonsosiciliano.gitlab.io/pos</span><span class="invisible">ts/2025-04-26-websysctl.html</span></a></p><p><a href="https://mastodon.bsd.cafe/tags/UNIX" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UNIX</span></a> <a href="https://mastodon.bsd.cafe/tags/FreeBSD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FreeBSD</span></a> <a href="https://mastodon.bsd.cafe/tags/kernel" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>kernel</span></a> <a href="https://mastodon.bsd.cafe/tags/sysctl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysctl</span></a> <a href="https://mastodon.bsd.cafe/tags/database" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>database</span></a></p>
hubertf<p>3/3<br>Details warum das so ist, ob man das wirklich braucht (nein?!) und was man dafür oder dagegen machen kann sind in folgenden Link nachzulesen:</p><p><a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=30aba6656f61ed44cba445a3c0d38b296fa9e8f5" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">git.kernel.org/pub/scm/linux/k</span><span class="invisible">ernel/git/torvalds/linux.git/commit/?id=30aba6656f61ed44cba445a3c0d38b296fa9e8f5</span></a></p><p><a href="https://mastodon.social/tags/verschlimmbessert" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>verschlimmbessert</span></a> <a href="https://mastodon.social/tags/ctf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ctf</span></a> <a href="https://mastodon.social/tags/cybersecurity" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cybersecurity</span></a> <a href="https://mastodon.social/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a> <a href="https://mastodon.social/tags/broken" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>broken</span></a> <a href="https://mastodon.social/tags/permissions" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>permissions</span></a> <a href="https://mastodon.social/tags/chmod" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>chmod</span></a> <a href="https://mastodon.social/tags/sysctl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysctl</span></a></p>
hubertf<p>2/3<br>Im Detail lag die Datei in einem Verzeichnis mit Mode 1777 (sticky Bit am Verzeichnis gesetzt), die zu schreibende Datei gehörte nicht dem der Schreiben wollte/sollte - ein Prozess unter einer anderen UserID. Die Datei war mit Absicht Mode 666 (rw-rw-rw-) eben damit geschrieben werden kann, Standard unter Unix seit zigzig Jahren. </p><p>Stellt sich am Ende raus: das ist Linux-only und abhängig von einem sysctl. </p><p><a href="https://mastodon.social/tags/ctf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ctf</span></a> <a href="https://mastodon.social/tags/cybersecurity" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cybersecurity</span></a> <a href="https://mastodon.social/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a> <a href="https://mastodon.social/tags/broken" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>broken</span></a> <a href="https://mastodon.social/tags/permissions" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>permissions</span></a> <a href="https://mastodon.social/tags/chmod" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>chmod</span></a> <a href="https://mastodon.social/tags/sysctl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysctl</span></a></p>
hubertf<p>1/3 <br>Ich konnte neulich nichts an eine fremde Datei anhängen die Mode 666 (rw-rw-rw-) war. Linux (natürlich), Fehlermeldung grad nicht zur Hand: </p><p>echo bla &gt;&gt; /tmp/logfile</p><p>Was war geschehen?</p><p><a href="https://mastodon.social/tags/ctf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ctf</span></a> <a href="https://mastodon.social/tags/cybersecurity" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cybersecurity</span></a> <a href="https://mastodon.social/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a> <a href="https://mastodon.social/tags/broken" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>broken</span></a> <a href="https://mastodon.social/tags/permissions" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>permissions</span></a> <a href="https://mastodon.social/tags/chmod" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>chmod</span></a> <a href="https://mastodon.social/tags/sysctl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysctl</span></a></p>
Peter N. M. Hansteen<p>New sysctl(8) -f option supports reading entire settings file in one go <a href="https://www.undeadly.org/cgi?action=article;sid=20250408120131" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">undeadly.org/cgi?action=articl</span><span class="invisible">e;sid=20250408120131</span></a><br><a href="https://mastodon.social/tags/openbsd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>openbsd</span></a> <a href="https://mastodon.social/tags/sysctl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysctl</span></a> <a href="https://mastodon.social/tags/sysadmin" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysadmin</span></a> <a href="https://mastodon.social/tags/devops" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>devops</span></a> <a href="https://mastodon.social/tags/development" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>development</span></a> <a href="https://mastodon.social/tags/security" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>security</span></a> <a href="https://mastodon.social/tags/freesoftware" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>freesoftware</span></a> <a href="https://mastodon.social/tags/libresoftware" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>libresoftware</span></a></p>
Axel ⌨🐧🐪🚴😷 | R.I.P Natenom<p><a href="https://chaos.social/tags/TIL" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TIL</span></a>: <a href="https://chaos.social/tags/Firefox" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Firefox</span></a> on <a href="https://chaos.social/tags/Linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Linux</span></a> works fine with</p><p>user.max_user_namespaces = 0</p><p>as well as with</p><p>user.max_user_namespaces = 100</p><p>but not with</p><p>user.max_user_namespaces = 1</p><p>which seems to have been set by default on my <a href="https://chaos.social/tags/DebianUnstable" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DebianUnstable</span></a> since last week or so.</p><p>Also Firefox' error messages on the shell were I started it weren't really that helpful:</p><p>Failed to launch tab subprocess @fork (Error:28): file ipc/[…]<br>fork() failed: No space left on device: file ipc/[…]</p><p><a href="https://chaos.social/tags/UserNS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UserNS</span></a> <a href="https://chaos.social/tags/UserNamespace" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UserNamespace</span></a> <a href="https://chaos.social/tags/sysctl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysctl</span></a></p>
Peter N. M. Hansteen<p>-current now has more flexible performance policy <a href="https://www.undeadly.org/cgi?action=article;sid=20241129093132" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">undeadly.org/cgi?action=articl</span><span class="invisible">e;sid=20241129093132</span></a> <a href="https://mastodon.social/tags/openbsd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>openbsd</span></a> <a href="https://mastodon.social/tags/perfpolicy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>perfpolicy</span></a> <a href="https://mastodon.social/tags/sysctl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sysctl</span></a> <a href="https://mastodon.social/tags/performance" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>performance</span></a></p>