From owner-freebsd-bugs@FreeBSD.ORG Wed Jul 4 20:50:04 2012 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BE2C81065672 for ; Wed, 4 Jul 2012 20:50:04 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 787398FC1D for ; Wed, 4 Jul 2012 20:50:04 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.5/8.14.5) with ESMTP id q64Ko4Gk012694 for ; Wed, 4 Jul 2012 20:50:04 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.5/8.14.5/Submit) id q64Ko4FY012693; Wed, 4 Jul 2012 20:50:04 GMT (envelope-from gnats) Resent-Date: Wed, 4 Jul 2012 20:50:04 GMT Resent-Message-Id: <201207042050.q64Ko4FY012693@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Peter Wullinger Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id CE783106564A for ; Wed, 4 Jul 2012 20:43:56 +0000 (UTC) (envelope-from bsd@dhke.de) Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.17.9]) by mx1.freebsd.org (Postfix) with ESMTP id 61CEF8FC0C for ; Wed, 4 Jul 2012 20:43:56 +0000 (UTC) Received: from kaliope.home (nrbg-4d075efe.pool.mediaWays.net [77.7.94.254]) by mrelayeu.kundenserver.de (node=mreu4) with ESMTP (Nemesis) id 0MTaYl-1SLsuC1CcB-00SSC9; Wed, 04 Jul 2012 22:43:55 +0200 Received: by kaliope.home (Postfix, from userid 10001) id 7F33CA3; Wed, 4 Jul 2012 22:43:54 +0200 (CEST) Message-Id: <20120704204354.7F33CA3@kaliope.home> Date: Wed, 4 Jul 2012 22:43:54 +0200 (CEST) From: Peter Wullinger To: FreeBSD-gnats-submit@FreeBSD.org X-Send-Pr-Version: 3.113 Cc: Subject: kern/169651: fexecve() and hashbang-scripts X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Peter Wullinger List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Jul 2012 20:50:04 -0000 >Number: 169651 >Category: kern >Synopsis: fexecve() and hashbang-scripts >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Jul 04 20:50:04 UTC 2012 >Closed-Date: >Last-Modified: >Originator: Peter Wullinger >Release: FreeBSD 9.0-STABLE amd64 >Organization: >Environment: System: FreeBSD kaliope 9.0-STABLE FreeBSD 9.0-STABLE #13 r237164: Sat Jun 16 18:31:08 CEST 2012 src@kaliope:/usr/obj/usr/src/sys/KALIOPE_MONO amd64 >Description: The fexecve() does not seem to work as described. I was able identify to cases 1) opening the file descriptor passwd to fexecve() with O_EXEC does not work. (see test case 1), below. 2) passing a readonly file descriptor to fexecve() with the target file being an interpreted script with a #! marker causes error message cannot open /dev/fd/n: No such file or directory to be raised from the target interpreter. >How-To-Repeat: Test case 1) extern char **environ; int main(int argc, char *argv[]) { int fd = open("/bin/ls" , O_EXEC); fexecve(fd, argv, environ); perror("fexecve"); } Yields fexecve: Bad file descriptor Changing O_EXEC to O_RDONLY works. Test case 2) extern char **environ; int main(int argc, char *argv[]) { int fd = open("/usr/bin/man" , O_RDONLY); fexecve(fd, argv, environ); perror("fexecve"); } Yields: cannot open /dev/fd/3: No such file or directory (/usr/bin/man is a shell script) >Fix: no fix known yet. >Release-Note: >Audit-Trail: >Unformatted: