Commit graph

10 commits

Author SHA1 Message Date
Phillip Lougher
037ecab65e squashfs: fix xattr id and id lookup sanity checks
commit 8b44ca2b63 upstream.

The checks for maximum metadata block size is missing
SQUASHFS_BLOCK_OFFSET (the two byte length count).

Link: https://lkml.kernel.org/r/2069685113.2081245.1614583677427@webmail.123-reg.co.uk
Fixes: f37aa4c736 ("squashfs: add more sanity checks in id lookup")
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Cc: Sean Nyekjaer <sean@geanix.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-30 14:35:23 +02:00
Phillip Lougher
3654a0ed0b squashfs: add more sanity checks in xattr id lookup
commit 506220d2ba upstream.

Sysbot has reported a warning where a kmalloc() attempt exceeds the
maximum limit.  This has been identified as corruption of the xattr_ids
count when reading the xattr id lookup table.

This patch adds a number of additional sanity checks to detect this
corruption and others.

1. It checks for a corrupted xattr index read from the inode.  This could
   be because the metadata block is uncompressed, or because the
   "compression" bit has been corrupted (turning a compressed block
   into an uncompressed block).  This would cause an out of bounds read.

2. It checks against corruption of the xattr_ids count.  This can either
   lead to the above kmalloc failure, or a smaller than expected
   table to be read.

3. It checks the contents of the index table for corruption.

[phillip@squashfs.org.uk: fix checkpatch issue]
  Link: https://lkml.kernel.org/r/270245655.754655.1612770082682@webmail.123-reg.co.uk

Link: https://lkml.kernel.org/r/20210204130249.4495-5-phillip@squashfs.org.uk
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Reported-by: syzbot+2ccea6339d368360800d@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-02-13 13:52:57 +01:00
Thomas Gleixner
68252eb5f8 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 35
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 or at your option any
  later version this program is distributed in the hope that it will
  be useful but without any warranty without even the implied warranty
  of merchantability or fitness for a particular purpose see the gnu
  general public license for more details you should have received a
  copy of the gnu general public license along with this program if
  not write to the free software foundation 51 franklin street fifth
  floor boston ma 02110 1301 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 23 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520170857.458548087@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:27:11 +02:00
Phillip Lougher
d7f2ff6718 Squashfs: update email address
My existing email address may stop working in a month or two, so update
email to one that will continue working.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-05-26 10:49:11 +01:00
Phillip Lougher
6f04864515 Squashfs: add sanity checks to xattr reading at mount time
These checks add sanity checking of the mount-time xattr structures.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-05-25 18:21:31 +01:00
Phillip Lougher
82de647e1f Squashfs: move table allocation into squashfs_read_table()
This eliminates a lot of duplicate code.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-05-25 18:21:31 +01:00
Phillip Lougher
8fcd97216f Squashfs: move squashfs_i() definition from squashfs.h
Move squashfs_i() definition out of squashfs.h, this eliminates
the need to #include squashfs_fs_i.h from numerous files.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-01-13 21:24:15 +00:00
Phillip Lougher
5f3b321da1 Squashfs: fix function prototype
The fourth argument should be unsigned.  Also add missing include
so that the function prototype is defined in xattr_id.c

This fixes a couple of sparse warnings.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2010-10-28 17:44:19 +01:00
Stephen Hemminger
aa5b1894cb squashfs: xattr_lookup sparse fix
Sparse detected that unsigned pointer was being passed as int pointer.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
[fixed up to deal with code refactoring]
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2010-05-17 20:02:03 +01:00
Phillip Lougher
4b5397dc24 squashfs: add xattr id support
This patch adds support for mapping xattr ids (stored in inodes)
into the on-disk location of the xattrs themselves.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2010-05-17 19:54:05 +01:00