From owner-svn-src-all@FreeBSD.ORG Fri Jan 28 15:29:36 2011 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5F57F106564A; Fri, 28 Jan 2011 15:29:36 +0000 (UTC) (envelope-from jilles@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 4F5878FC12; Fri, 28 Jan 2011 15:29:36 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id p0SFTavq084885; Fri, 28 Jan 2011 15:29:36 GMT (envelope-from jilles@svn.freebsd.org) Received: (from jilles@localhost) by svn.freebsd.org (8.14.3/8.14.3/Submit) id p0SFTair084884; Fri, 28 Jan 2011 15:29:36 GMT (envelope-from jilles@svn.freebsd.org) Message-Id: <201101281529.p0SFTair084884@svn.freebsd.org> From: Jilles Tjoelker Date: Fri, 28 Jan 2011 15:29:36 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r218019 - head/sys/kern X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Jan 2011 15:29:36 -0000 Author: jilles Date: Fri Jan 28 15:29:35 2011 New Revision: 218019 URL: http://svn.freebsd.org/changeset/base/218019 Log: Do not trip a KASSERT if /dev/null cannot be opened for a setuid program. The fdcheckstd() function makes sure fds 0, 1 and 2 are open by opening /dev/null. If this fails (e.g. missing devfs or wrong permissions), fdcheckstd() will return failure and the process will exit as if it received SIGABRT. The KASSERT is only to check that kern_open() returns the expected fd, given that it succeeded. Tripping the KASSERT is most likely if fd 0 is open but fd 1 or 2 are not. MFC after: 2 weeks Modified: head/sys/kern/kern_descrip.c Modified: head/sys/kern/kern_descrip.c ============================================================================== --- head/sys/kern/kern_descrip.c Fri Jan 28 15:25:46 2011 (r218018) +++ head/sys/kern/kern_descrip.c Fri Jan 28 15:29:35 2011 (r218019) @@ -2024,10 +2024,10 @@ fdcheckstd(struct thread *td) error = kern_open(td, "/dev/null", UIO_SYSSPACE, O_RDWR, 0); devnull = td->td_retval[0]; - KASSERT(devnull == i, ("oof, we didn't get our fd")); td->td_retval[0] = save; if (error) break; + KASSERT(devnull == i, ("oof, we didn't get our fd")); } else { error = do_dup(td, DUP_FIXED, devnull, i, &retval); if (error != 0)