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From: Santiago Garcia Mantinan <manty@debian.org>
To: linux-kernel@vger.kernel.org, debian-kernel@lists.debian.org
Subject: problems with latest smbfs changes on 2.4.34 and security backports
Date: Wed, 17 Jan 2007 11:00:30 +0100	[thread overview]
Message-ID: <20070117100030.GA11251@clandestino.aytolacoruna.es> (raw)

Hi!

I have discovered a problem with the changes applied to smbfs in 2.4.34 and
in the security backports like last Debian's 2.4 kernel update these changes
seem to be made to solve CVE-2006-5871 and they have broken symbolic links
and changed the way that special files (like devices) are seen.

For example:
Before: symbolic links were seen as that, symbolic links an thus if you tried
to open the file the link was followed and you ended up reading the
destination file
Now: symbolic links are seen as normal files (at least with a ls) but their
length (N) is the length of the symbolic link, if you read it, you'll get the
first N characters of the destination file. For example, on my filesystem
bin/sh is a symlink to bash, thus it is 4 bytes long, if I to a cat bin/sh I
get ELF (this is, the first 4 characters of the bash program, first one
being a DEL).

Another example:
Before: if you did a ls of a device file, like dev/zero you could see it as
a device, if you tried opening it, it wouldn't work, but if you did a cp -a
of that file to a local filesystem the result was a working zero device.
Now: the devices are seen as normal files with a length of 0 bytes.

Seems to me like a mask is erasing some mode bits that shouldn't be erased.

I have carried my tests on a Debian Sarge machine always mounting the share
using: smbmount //server/share /mnt without any other options. The tests
were carried on a unpatched 2.4.34 comparing it to 2.4.33 and also on
Debian's 2.4.27 comparing 2.4.27-10sarge4 vs -10sarge5. The server is a
samba 3.0.23d and I have experienced the same behaviour with samba's
unix extensions = yes and unix extensions = no.

I don't know what else to add, if you need any more info or want me to do
any tests just ask for it.

Regards...
-- 
Santiago García Mantiñán

             reply	other threads:[~2007-01-17 10:24 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-17 10:00 Santiago Garcia Mantinan [this message]
2007-01-17 21:55 ` Willy Tarreau
2007-01-18  0:09   ` Grant Coady
2007-01-18  4:21     ` Willy Tarreau
2007-01-18  5:59       ` Grant Coady
2007-01-18 22:51   ` dann frazier
2007-01-19  1:00   ` dann frazier
2007-01-19  5:15     ` Willy Tarreau
2007-01-20  1:05     ` dann frazier
2007-01-20  6:18       ` Willy Tarreau
2007-01-21 22:52       ` Grant Coady
2007-01-21 23:03         ` Willy Tarreau
2007-01-21 23:50           ` Grant Coady
2007-01-22 18:19             ` dann frazier
2007-01-23  5:42               ` Willy Tarreau
2007-01-23 21:12                 ` dann frazier
2007-01-23 22:00                   ` Willy Tarreau
2007-01-23 23:46                   ` Grant Coady
2007-01-24  0:11                     ` dann frazier
2007-01-22  8:54           ` Santiago Garcia Mantinan
2007-01-22  9:18             ` Willy Tarreau
2007-01-22  9:36               ` Santiago Garcia Mantinan
2007-01-22 10:49                 ` Grant Coady
2007-01-22 10:46               ` Grant Coady
2007-01-23 20:19           ` dann frazier
2007-01-23 21:04             ` Grant Coady
2007-01-23 21:35               ` dann frazier

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