From unknown Sun Jun 22 08:08:13 2025 X-Loop: help-debbugs@gnu.org Subject: bug#50193: guix: shepherd pid 1 holds /dev/console Resent-From: muradm Original-Sender: "Debbugs-submit" Resent-CC: bug-guix@gnu.org Resent-Date: Tue, 24 Aug 2021 18:43:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 50193 X-GNU-PR-Package: guix X-GNU-PR-Keywords: To: 50193@debbugs.gnu.org X-Debbugs-Original-To: bug-guix@gnu.org Received: via spool by submit@debbugs.gnu.org id=B.162983053820940 (code B ref -1); Tue, 24 Aug 2021 18:43:02 +0000 Received: (at submit) by debbugs.gnu.org; 24 Aug 2021 18:42:18 +0000 Received: from localhost ([127.0.0.1]:45222 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mIbNK-0005Rg-GR for submit@debbugs.gnu.org; Tue, 24 Aug 2021 14:42:18 -0400 Received: from lists.gnu.org ([209.51.188.17]:37130) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mIbNJ-0005RY-0k for submit@debbugs.gnu.org; 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Tue, 24 Aug 2021 11:42:11 -0700 (PDT) User-agent: mu4e 1.6.3; emacs 28.0.50 From: muradm Date: Tue, 24 Aug 2021 21:37:59 +0300 Message-ID: <87pmu2n0qn.fsf@muradm.net> MIME-Version: 1.0 Content-Type: text/plain; format=flowed Received-SPF: none client-ip=2a00:1450:4864:20::435; envelope-from=mail@muradm.net; helo=mail-wr1-x435.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -2.3 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -3.3 (---) On IRC chat we identified an issue related to linux SAK, which is explained here https://www.kernel.org/doc/html/latest/security/sak.html Following the check what processes will be SAK'ed: ~# ls -l /proc/[0-9]*/fd/* | grep console lrwx------ 1 root root 64 Aug 24 21:22 /proc/1/fd/1 -> /dev/console lrwx------ 1 root root 64 Aug 24 21:22 /proc/1/fd/2 -> /dev/console l-wx------ 1 root root 64 Aug 24 21:22 /proc/578/fd/4 -> /dev/console lrwx------ 1 root root 64 Aug 24 21:22 /proc/593/fd/1 -> /dev/console lrwx------ 1 root root 64 Aug 24 21:22 /proc/593/fd/2 -> /dev/console lrwx------ 1 root root 64 Aug 24 20:03 /proc/705/fd/1 -> /dev/console lrwx------ 1 root root 64 Aug 24 20:03 /proc/705/fd/2 -> /dev/console lrwx------ 1 root root 64 Aug 24 21:22 /proc/909/fd/1 -> /dev/console lrwx------ 1 root root 64 Aug 24 21:22 /proc/909/fd/2 -> /dev/console As it is seen from above output, pid 1 which is shepherd holds /dev/console making linux SAK feature useless. When SAK command issued by shortcut keys, all above proceses gets killed including pid 1 which is shepherd, causing system to stall.