This is a note to let you know that I've just added the patch titled
Squashfs: check the inode number is not the invalid value of zero
to the 6.8-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:
squashfs-check-the-inode-number-is-not-the-invalid-value-of-zero.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9253c54e01b6505d348afbc02abaa4d9f8a01395 Mon Sep 17 00:00:00 2001
From: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>
Date: Mon, 8 Apr 2024 23:02:06 +0100
Subject: Squashfs: check the inode number is not the invalid value of zero
From: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>
commit 9253c54e01b6505d348afbc02abaa4d9f8a01395 upstream.
Syskiller has produced an out of bounds access in fill_meta_index().
That out of bounds access is ultimately caused because the inode
has an inode number with the invalid value of zero, which was not checked.
The reason this causes the out of bounds access is due to following
sequence of events:
1. Fill_meta_index() is called to allocate (via empty_meta_index())
and fill a metadata index. It however suffers a data read error
and aborts, invalidating the newly returned empty metadata index.
It does this by setting the inode number of the index to zero,
which means unused (zero is not a valid inode number).
2. When fill_meta_index() is subsequently called again on another
read operation, locate_meta_index() returns the previous index
because it matches the inode number of 0. Because this index
has been returned it is expected to have been filled, and because
it hasn't been, an out of bounds access is performed.
This patch adds a sanity check which checks that the inode number
is not zero when the inode is created and returns -EINVAL if it is.
[phillip@xxxxxxxxxxxxxxx: whitespace fix]
Link: https://lkml.kernel.org/r/20240409204723.446925-1-phillip@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20240408220206.435788-1-phillip@xxxxxxxxxxxxxxx
Signed-off-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>
Reported-by: "Ubisectech Sirius" <bugreport@xxxxxxxxxxxxxx>
Closes: https://lore.kernel.org/lkml/87f5c007-b8a5-41ae-8b57-431e924c5915.bugreport@xxxxxxxxxxxxxx/
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/squashfs/inode.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -48,6 +48,10 @@ static int squashfs_new_inode(struct sup
gid_t i_gid;
int err;
+ inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
+ if (inode->i_ino == 0)
+ return -EINVAL;
+
err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid);
if (err)
return err;
@@ -58,7 +62,6 @@ static int squashfs_new_inode(struct sup
i_uid_write(inode, i_uid);
i_gid_write(inode, i_gid);
- inode->i_ino = le32_to_cpu(sqsh_ino->inode_number);
inode_set_mtime(inode, le32_to_cpu(sqsh_ino->mtime), 0);
inode_set_atime(inode, inode_get_mtime_sec(inode), 0);
inode_set_ctime(inode, inode_get_mtime_sec(inode), 0);
Patches currently in stable-queue which might be from phillip@xxxxxxxxxxxxxxx are
queue-6.8/squashfs-check-the-inode-number-is-not-the-invalid-value-of-zero.patch
