Date: Fri, 19 Oct 2001 15:15:23 +0000 From: pdp@nl.demon.net To: FreeBSD-gnats-submit@freebsd.org Subject: kern/31375: "cd .." at mount-point uses perms of dir under mount Message-ID: <E15ubMp-000DN9-00@samhain.noc.nl.demon.net>
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>Number: 31375 >Category: kern >Synopsis: "cd .." at mount-point uses perms of dir under mount >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Oct 19 08:20:00 PDT 2001 >Closed-Date: >Last-Modified: >Originator: Phil Pennock >Release: FreeBSD 4.4-STABLE i386 >Organization: Demon Internet Netherlands >Environment: System built to RELENG_4, cvsup'd 2001-10-17. Kernel config available upon request. Filesystems used are ufs. >Description: It appears that when determining where ".." is, in a directory which is a mount-point, the file-permissions of the underlying directory are used, rather than the permissions of the mounted directory. See below for evidence backing this analysis. Found because it breaks /etc/periodic/weekly/310.locate Note that the practice of "chmod 0 /a/mountpoint" is not unusual. Workaround: change permissions of mountpoints >How-To-Repeat: # mkdir /d/mounthere # touch /d/mounthere/NOTHING_MOUNTED_HERE # chmod 0 /d/mounthere [ have a relevant filesystem in /etc/fstab, or choose one ] # mount /d/mounthere # su -m nobody $ cd /d/mounthere $ pwd /d/mounthere $ ls -ld . drwxr-xr-x 2 root wheel 512 Oct 18 20:42 . $ cd .. cd: can't cd to .. $ <control-D> # umount /d/mounthere # chmod 555 /d/mounthere # mount /d/mounthere # su -m nobody $ cd /d/mounthere $ cd .. $ pwd /d $ >Fix: Unknown >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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