linux-toradex.git/fs/squashfs/dir.c, branch v4.4.23

Squashfs: add corruption check for type in squashfs_readdir()

2013-09-06T03:57:54+00:00

We read the type field from disk.  This value should be sanity
checked for correctness to avoid an out of bounds access when
reading the squashfs_filetype_table array.

Signed-off-by: Phillip Lougher

Squashfs: add corruption check in get_dir_index_using_offset()

2013-09-06T03:57:53+00:00

We read the size (of the name) field from disk.  This value should
be sanity checked for correctness to avoid blindly reading
huge amounts of unnecessary data from disk on corruption.

Note, here we're not actually reading the name into a buffer, but
skipping it, and so corruption doesn't cause buffer overflow, merely
lots of unnecessary amounts of data to be read.

Signed-off-by: Phillip Lougher

Squashfs: fix corruption checks in squashfs_readdir()

2013-09-06T03:57:53+00:00

The dir_count and size fields when read from disk are sanity
checked for correctness.  However, the sanity checks only check the
values are not greater than expected.  As dir_count and size were
incorrectly defined as signed ints, this can lead to corrupted values
appearing as negative which are not trapped.

Signed-off-by: Phillip Lougher

[readdir] convert squashfs

2013-06-29T08:56:28+00:00

Signed-off-by: Al Viro

new helper: file_inode(file)

2013-02-23T04:31:31+00:00

Signed-off-by: Al Viro

Squashfs: fix f_pos check in get_dir_index_using_offset

2012-03-10T03:01:02+00:00

One off error in the f_pos check.  If f_pos is 3 or less don't
bother reading the index because we're at the start of the
directory, and we obviously already know where that is on disk.

This eliminates an unnecessary read.

Signed-off-by: Phillip Lougher

Squashfs: remove redundant length initialisation in squashfs_readdir

2012-03-10T03:01:01+00:00

Signed-off-by: Phillip Lougher

Squashfs: use define instead of constant

2012-03-10T03:00:54+00:00

Its better to use defined name instead of constant

Signed-off-by: Ajeet Yadav 
Signed-off-by: Phillip Lougher

Squashfs: update email address

2011-05-26T09:49:11+00:00

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

Squashfs: handle corruption of directory structure

2011-03-16T01:04:18+00:00

Handle the rare case where a directory metadata block is uncompressed and
corrupted, leading to a kernel oops in directory scanning (memcpy).
Normally corruption is detected at the decompression stage and dealt with
then, however, this will not happen if:

- metadata isn't compressed (users can optionally request no metadata
  compression), or
- the compressed metadata block was larger than the original, in which
  case the uncompressed version was used, or
- the data was corrupt after decompression

This patch fixes this by adding some sanity checks against known maximum
values.

Signed-off-by: Phillip Lougher