Date: Wed, 28 Oct 2020 22:13:47 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 250701] [tty] [patch] Race condition between tty_wait_background() and doenterpgrp() Message-ID: <bug-250701-227-ynjeTfESKk@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-250701-227@https.bugs.freebsd.org/bugzilla/> References: <bug-250701-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250701 --- Comment #1 from commit-hook@FreeBSD.org --- A commit references this bug: Author: kib Date: Wed Oct 28 22:12:47 UTC 2020 New revision: 367120 URL: https://svnweb.freebsd.org/changeset/base/367120 Log: Check for process group change in tty_wait_background(). The calling process's process group can change between PROC_UNLOCK(p) and PGRP_LOCK(pg) in tty_wait_background(), e.g. by a setpgid() call from another process. If that happens, the signal is not sent to the calling process, even if the prior checks determine that one should be sent. Re-check that the process group hasn't changed after acquiring the pgrp lock, and if it has, redo the checks. PR: 250701 Submitted by: Jakub Piecuch <j.piecuch96@gmail.com> MFC after: 2 weeks Changes: head/sys/kern/tty.c --=20 You are receiving this mail because: You are the assignee for the bug.=
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