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=250701 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=219174&action=edit 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 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. The patch checks that the process group hasn't changed after acquiring the pgrp lock, and if it has, it redoes the checks. -- You are receiving this mail because: You are the assignee for the bug.
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