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| author |   Mimi Zohar <zohar@linux.ibm.com> | 2023-10-18 14:47:02 -0400 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2023-10-31 08:22:36 -0400 |
| commit | b836c4d29f2744200b2af41e14bf50758dddc818 (patch) | |
| tree | 4ec0534db76707ad1e7d5a0ffe3a1bcd5b140901 /fs/overlayfs | |
| parent | certs: Only allow certs signed by keys on the builtin keyring (diff) | |
| download | wireguard-linux-b836c4d29f2744200b2af41e14bf50758dddc818.tar.xz wireguard-linux-b836c4d29f2744200b2af41e14bf50758dddc818.zip | |
ima: detect changes to the backing overlay file
Commit 18b44bc5a672 ("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>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 3fa2416264a4..c71d185980c0 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -1489,7 +1489,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc) ovl_trusted_xattr_handlers; sb->s_fs_info = ofs; sb->s_flags |= SB_POSIXACL; - sb->s_iflags |= SB_I_SKIP_SYNC | SB_I_IMA_UNVERIFIABLE_SIGNATURE; + sb->s_iflags |= SB_I_SKIP_SYNC; err = -ENOMEM; root_dentry = ovl_get_root(sb, ctx->upper.dentry, oe); |