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linux/fs/squashfs/dir.c

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Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
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 10:39:56 +01:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
Squashfs: add corruption check in get_dir_index_using_offset() 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 <phillip@squashfs.org.uk>
2013-09-03 04:52:52 +01:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
Squashfs: fix f_pos check in get_dir_index_using_offset 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 <phillip@squashfs.org.uk>
2012-03-09 02:27:49 +00:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
Squashfs: add corruption check in get_dir_index_using_offset() 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 <phillip@squashfs.org.uk>
2013-09-03 04:52:52 +01:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
Squashfs: add corruption check in get_dir_index_using_offset() 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 <phillip@squashfs.org.uk>
2013-09-03 04:52:52 +01:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
new helper: file_inode(file) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-01-23 17:07:38 -05:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
Squashfs: add corruption check for type in squashfs_readdir() 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 <phillip@squashfs.org.uk>
2013-09-04 02:58:12 +01:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
Squashfs: handle corruption of directory structure 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 <phillip@lougher.demon.co.uk>
2011-03-15 22:09:55 +00:00
Squashfs: use define instead of constant Its better to use defined name instead of constant Signed-off-by: Ajeet Yadav <ajeet.yadav.77@gmail.com> Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
2012-02-02 13:04:49 +05:30
Squashfs: handle corruption of directory structure 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 <phillip@lougher.demon.co.uk>
2011-03-15 22:09:55 +00:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
Squashfs: handle corruption of directory structure 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 <phillip@lougher.demon.co.uk>
2011-03-15 22:09:55 +00:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
Squashfs: add corruption check for type in squashfs_readdir() 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 <phillip@squashfs.org.uk>
2013-09-04 02:58:12 +01:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
[readdir] convert squashfs Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-16 01:17:58 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00
romfs, squashfs: switch to ->iterate_shared() don't need to lock directory in ->llseek(), either Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-04-30 23:08:45 -04:00
Squashfs: directory readdir operations Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 08:46:23 +00:00