Date: Mon, 1 Jan 2001 04:00:54 -0800 (PST) From: jau@iki.fi To: freebsd-gnats-submit@FreeBSD.org Subject: kern/23990: access(2) system call reports an immutable file as writable Message-ID: <200101011200.f01C0sX92024@freefall.freebsd.org> Resent-Message-ID: <200101011210.f01CA2b94403@freefall.freebsd.org>
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>Number: 23990 >Category: kern >Synopsis: access(2) system call reports an immutable file as writable >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Jan 01 04:10:01 PST 2001 >Closed-Date: >Last-Modified: >Originator: Jukka A. Ukkonen >Release: 3.5.1 >Organization: Finnish UNIX Users' Group >Environment: FreeBSD mjolnir.thunderbolt.fi 3.5.1-RELEASE FreeBSD 3.5.1-RELEASE #2: Mon Oct 16 13:00:59 EET DST 2000 jau@mjolnir.thunderbolt.fi:/usr/src/sys/compile/Mjolnir i386 >Description: The access(2) system call reports an immutable file as writable though the reasonable approach would be to report "not writable". This is a problem for programs that rely on accept(2) providing them correct information about the accessibilty of files. Especially when someone wants to quickly review one's files' accessibility with a program like access(1) the current behaviour produces misleading results and is logically in contradiction with reporting files on read-only mounted file systems as "not writable". Currently the only way to really know whether writing is OK or not is by trying to open the file for writing. >How-To-Repeat: # touch testfile # chflags uchg testfile # access -w testfile >Fix: Should be relatively straight forward by adding a VOP_GETATTR(vp, &va, p->p_ucred, p) call and (va.va_flags & IMMUTABLE) test to access(2). >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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