Date: Tue, 6 Oct 1998 19:17:36 -0700 (PDT)
From: serge@yahoo-inc.com
To: FreeBSD-gnats-submit@FreeBSD.ORG
Cc: serge@yahoo-inc.com
Subject: kern/8180: open("..",O_RDONLY|O_NONBLOCK) fails
Message-ID: <199810070217.TAA12930@serge.yahoo.com>
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>Number: 8180
>Category: kern
>Synopsis: open("..",O_RDONLY|O_NONBLOCK) fails
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Oct 6 19:20:00 PDT 1998
>Last-Modified:
>Originator: Sergiy Zhuk
>Organization:
>Release: FreeBSD 2.2.7-STABLE i386
>Environment:
the bug is present in all bsd 2.1.x and 2.2.x (including the latest STABLE)
>Description:
looks like open() is checking permissions of the mount point rather then
permissions of the mounted filesystem.
>How-To-Repeat:
as root:
$ mkdir /sd1
$ chmod 700 /sd1
$ ls -lad /sd1
drwx------ 2 root wheel 512 Oct 2 19:39 /sd1
$ mount /dev/sd1a /sd1
OR
$ mount some_host:/exported_fs /sd1
$ ls -ld /sd1
drwxr-xr-x 46 1064 1685 1024 Jan 12 1998 /sd1
as a normal user:
$ cd /sd1
$ ls -la ..
ls: ..: Permission denied
$ cd ..
$ ls -la
total 2733
drwxr-xr-x 18 root wheel 512 2 ΟΛΤ 19:39 .
drwxr-xr-x 18 root wheel 512 2 ΟΛΤ 19:39 ..
-rw-r--r-- 2 root wheel 356 21 ΟΛΤ 1997 .cshrc
[...]
as a result getwd() and getcwd() in /sd1 fails as they do
opendir() (which calls open()).
>Fix:
rewrite kernel code
workaround:
as root:
$ umount /sd1;chmod 755 /sd1
one can use open() + fchdir() instead of getcwd(), but this is not a fix
anyway
>Audit-Trail:
>Unformatted:
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