From owner-freebsd-fs@freebsd.org Tue Feb 14 10:42:23 2017 Return-Path: Delivered-To: freebsd-fs@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 962F4CDF84D for ; Tue, 14 Feb 2017 10:42:23 +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 6BDDC14BD for ; Tue, 14 Feb 2017 10:42:23 +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 v1EAgNdm026288 for ; Tue, 14 Feb 2017 10:42:23 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-fs@FreeBSD.org Subject: [Bug 217062] for file systems mounted with -o noexec, exec=off property does not work for mmap Date: Tue, 14 Feb 2017 10:42:23 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed 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-fs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: attachments.created 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-fs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Feb 2017 10:42:23 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217062 --- Comment #3 from shamaz.mazum@gmail.com --- Created attachment 179980 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D179980&action= =3Dedit Minimal test (In reply to Konstantin Belousov from comment #2) Oh, I thought noexec means complete 100% protection from any execution ;) B= ut I have some doubts. What does the following code means in sys/kern/vfs_vnops.= c ? /* * Ensure that file and memory protections are * compatible. Note that we only worry about * writability if mapping is shared; in this case, * current and max prot are dictated by the open file. * XXX use the vnode instead? Problem is: what * credentials do we use for determination? What if * proc does a setuid? */ mp =3D vp->v_mount; if (mp !=3D NULL && (mp->mnt_flag & MNT_NOEXEC) !=3D 0) maxprot =3D VM_PROT_NONE; else maxprot =3D VM_PROT_EXECUTE; if ((fp->f_flag & FREAD) !=3D 0) maxprot |=3D VM_PROT_READ; else if ((prot & VM_PROT_READ) !=3D 0) return (EACCES); The source is vn_map() function in source src/sys/kern/vfs_vnops.c A minimal test as you asked. Compile it and launch with any file on no-exec filesystem as its only argument. It tries to do mmap() and mprotect() and returns results --=20 You are receiving this mail because: You are the assignee for the bug.=