NetBSD Problem Report #52634

From campbell@mumble.net  Fri Oct 20 15:59:32 2017
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Date: Fri, 20 Oct 2017 16:02:27 +0000 (UTC)
From: Taylor R Campbell <riastradh@NetBSD.org>
Reply-To: Taylor R Campbell <riastradh@NetBSD.org>
To: gnats-bugs@gnats.NetBSD.org
Subject: possible unhandled spurious wakeup in posix_spawn
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>Number:         52634
>Category:       kern
>Synopsis:       possible unhandled spurious wakeup in posix_spawn
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    martin
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Oct 20 16:00:00 +0000 2017
>Last-Modified:  Fri Oct 20 16:03:05 +0000 2017
>Originator:     Taylor R Campbell <riastradh@NetBSD.org>
>Release:        NetBSD-current
>Organization:
The NetBSD Foundation
>Environment:
any
>Description:

	do_posix_spawn calls cv_wait without looping on a test for a
	condition, which may cause it to return before the child is
	ready -- and potentially even to read and return an
	uninitialized error -- in the case of a spurious wakeup:

	https://nxr.netbsd.org/xref/src/sys/kern/kern_exec.c?r=1.448#2605

>How-To-Repeat:

	Code inspection.

>Fix:

	Yes, please!

>Release-Note:

>Audit-Trail:

Responsible-Changed-From-To: kern-bug-people->martin
Responsible-Changed-By: martin@NetBSD.org
Responsible-Changed-When: Fri, 20 Oct 2017 16:03:05 +0000
Responsible-Changed-Why:
take


>Unformatted:

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