From owner-freebsd-bugs@freebsd.org Thu Dec 29 22:23:49 2016 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1167EC96AB2 for ; Thu, 29 Dec 2016 22:23:49 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 00DCF169E for ; Thu, 29 Dec 2016 22:23:49 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id uBTMNm1G003361 for ; Thu, 29 Dec 2016 22:23:48 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 213922] crafted data could cause qsort to exhaust stack space Date: Thu, 29 Dec 2016 22:23:48 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: patch X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: pfg@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Dec 2016 22:23:49 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D213922 --- Comment #4 from Pedro F. Giffuni --- (In reply to jhoward from comment #3) Thanks for looking into it. I have just been too busy. BTW, if you could up= load a diff to bugzilla it would be much better. You can check the standalone tests here: https://svnweb.freebsd.org/base/stable/9/tools/regression/lib/libc/stdlib/ (Newer FreeBSD versions have integrated the regression tool into the testsuite.) I think I had a random testcase with more datapoints somewhere = to verify the last commit. and you can get VM images from ftp, for example here: ftp://ftp.freebsd.org/pub/FreeBSD/releases/VM-IMAGES/11.0-RELEASE/ About exploitability, it very much depends on where qsort() is used, opengr= ok is your friend, and if you are able to realistically generate such sequence= . I am aware there are cases where the algorithm can be suboptimal; it may be t= he case that the algorithm needs revision (I just haven't seen a case in real life). --=20 You are receiving this mail because: You are the assignee for the bug.=