linux/fs/overlayfs
Mimi Zohar 143f450c6c ima: detect changes to the backing overlay file
commit b836c4d29f upstream.

Commit 18b44bc5a6 ("ovl: Always reevaluate the file signature for
IMA") forced signature re-evaulation on every file access.

Instead of always re-evaluating the file's integrity, detect a change
to the backing file, by comparing the cached file metadata with the
backing file's metadata.  Verifying just the i_version has not changed
is insufficient.  In addition save and compare the i_ino and s_dev
as well.

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Tested-by: Eric Snowberg <eric.snowberg@oracle.com>
Tested-by: Raul E Rangel <rrangel@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-11-28 17:07:12 +00:00
..
copy_up.c overlayfs: set ctime when setting mtime and atime 2023-10-25 12:03:09 +02:00
dir.c ovl: update of dentry revalidate flags after copy up 2023-07-19 16:21:33 +02:00
export.c ovl: update of dentry revalidate flags after copy up 2023-07-19 16:21:33 +02:00
file.c ovl: fix incorrect fdput() on aio completion 2023-09-23 11:11:10 +02:00
inode.c ovl: fix null pointer dereference in ovl_permission() 2023-08-03 10:23:47 +02:00
Kconfig docs: fix broken references to text files 2020-04-20 15:35:59 -06:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
namei.c ovl: update of dentry revalidate flags after copy up 2023-07-19 16:21:33 +02:00
overlayfs.h ovl: let helper ovl_i_path_real() return the realinode 2023-07-23 13:49:28 +02:00
ovl_entry.h ovl: check type and offset of struct vfsmount in ovl_entry 2023-07-27 08:50:32 +02:00
readdir.c whack-a-mole: constifying struct path * 2022-10-06 17:31:02 -07:00
super.c ima: detect changes to the backing overlay file 2023-11-28 17:07:12 +00:00
util.c ovl: let helper ovl_i_path_real() return the realinode 2023-07-23 13:49:28 +02:00