This is a note to let you know that I've just added the patch titled
udf: Check length of extended attributes and allocation
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
udf-check-length-of-extended-attributes-and-allocation.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 23b133bdc452aa441fcb9b82cbf6dd05cfd342d0 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@xxxxxxx>
Date: Wed, 7 Jan 2015 13:49:08 +0100
Subject: udf: Check length of extended attributes and allocation
descriptors
From: Jan Kara <jack@xxxxxxx>
commit 23b133bdc452aa441fcb9b82cbf6dd05cfd342d0 upstream.
Check length of extended attributes and allocation descriptors when
loading inodes from disk. Otherwise corrupted filesystems could confuse
the code and make the kernel oops.
This fixes CVE-2015-4167.
Reported-by: Carl Henrik Lunde <chlunde@xxxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
[Use make_bad_inode() instead of branching due to older implementation.]
Signed-off-by: Chas Williams <3chas3@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/udf/inode.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1496,6 +1496,22 @@ static void udf_fill_inode(struct inode
iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
}
+ /*
+ * Sanity check length of allocation descriptors and extended attrs to
+ * avoid integer overflows
+ */
+ if (iinfo->i_lenEAttr > inode->i_sb->s_blocksize
+ || iinfo->i_lenAlloc > inode->i_sb->s_blocksize) {
+ make_bad_inode(inode);
+ return;
+ }
+ /* Now do exact checks */
+ if (udf_file_entry_alloc_offset(inode)
+ + iinfo->i_lenAlloc > inode->i_sb->s_blocksize) {
+ make_bad_inode(inode);
+ return;
+ }
+
switch (fe->icbTag.fileType) {
case ICBTAG_FILE_TYPE_DIRECTORY:
inode->i_op = &udf_dir_inode_operations;
Patches currently in stable-queue which might be from jack@xxxxxxx are
queue-3.14/udf-check-length-of-extended-attributes-and-allocation.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html