From owner-freebsd-bugs@freebsd.org Mon Feb 13 10:28:21 2017 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 6FF50CDC6B4 for ; Mon, 13 Feb 2017 10:28:21 +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 45BFF16C8 for ; Mon, 13 Feb 2017 10:28:21 +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 v1DASLJA039437 for ; Mon, 13 Feb 2017 10:28:21 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 217062] ZFS exec=off property does not work for mmap Date: Mon, 13 Feb 2017 10:28:21 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: shamaz.mazum@gmail.com 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: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.created Message-ID: 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: Mon, 13 Feb 2017 10:28:21 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217062 Bug ID: 217062 Summary: ZFS exec=3Doff property does not work for mmap Product: Base System Version: 11.0-STABLE Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: shamaz.mazum@gmail.com Created attachment 179941 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D179941&action= =3Dedit Test for the bug Hello. I've noticed that you can execute a code from ZFS filesystem with ex= ec property set to off with mmap'ing it with PROT_READ | PROT_EXEC protection.= If this is not done at mmap time, further calls to mprotect trying to set PROT_EXEC protection will fail. For example, I cannot launch SBCL with core image in my no-exec home direct= ory (because it calls mprotect), but I can execute any code from shared librari= es in home directory if I open it with dlopen(). It seems to me as a bug, so I report. I attach a working example to illustrate a problem. It will require some tuning. In the attached archive compile lib.c as a shared library. Then pla= ce it in no-exec ZFS filesystem. Then compile test-working.c and test-bug.c, replacing hard-coded values in calls to open() and mmap() (filename and add= ress of return_value. You can get the address with objdump -T). Place binaries somewhere you can execute them. Execute test-working at first. It will fail= to work if library is in no-exec FS. Then execute test-bug. It will return the value 4 from the library no matter where it is stored. Even if it is on no-= exec FS, it will be executed. --=20 You are receiving this mail because: You are the assignee for the bug.=