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| author | Eric Snowberg <eric.snowberg@oracle.com> | 2023-07-26 00:56:46 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-07-26 01:36:22 +0300 |
| commit | 18b44bc5a67275641fb26f2c54ba7eef80ac5950 (patch) | |
| tree | afa6c2f41c5b80f08a381d28b607fa8f9ee9728a /fs/overlayfs | |
| parent | 9f9116406120638b4d8db3831ffbc430dd2e1e95 (diff) | |
| download | linux-18b44bc5a67275641fb26f2c54ba7eef80ac5950.tar.xz | |
ovl: Always reevaluate the file signature for IMA
Commit db1d1e8b9867 ("IMA: use vfs_getattr_nosec to get the i_version")
partially closed an IMA integrity issue when directly modifying a file
on the lower filesystem. If the overlay file is first opened by a user
and later the lower backing file is modified by root, but the extended
attribute is NOT updated, the signature validation succeeds with the old
original signature.
Update the super_block s_iflags to SB_I_IMA_UNVERIFIABLE_SIGNATURE to
force signature reevaluation on every file access until a fine grained
solution can be found.
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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 5b069f1a1e44..cc8977498c48 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -1460,7 +1460,7 @@ 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->s_iflags |= SB_I_SKIP_SYNC | SB_I_IMA_UNVERIFIABLE_SIGNATURE; err = -ENOMEM; root_dentry = ovl_get_root(sb, ctx->upper.dentry, oe); |