Date: Wed, 28 Oct 2020 19:47:39 +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@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250701 Bug ID: 250701 Summary: [tty] [patch] Race condition between tty_wait_background() and doenterpgrp() Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: j.piecuch96@gmail.com Created attachment 219174 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D219174&action= =3Dedit Patch: 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 anoth= er process. If that happens, the signal is not sent to the calling process, ev= en if the prior checks determine that one should be sent. The patch checks that the process group hasn't changed after acquiring the = pgrp lock, and if it has, it redoes the checks. --=20 You are receiving this mail because: You are the assignee for the bug.=
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