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ovl: Always reevaluate the file signature for IMA 

Commit db1d1e8b98 ("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>
This commit is contained in:
Eric Snowberg 2023-07-25 17:56:46 -04:00 committed by Linus Torvalds
parent 9f91164061
commit 18b44bc5a6
1 changed files with 1 additions and 1 deletions
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2
fs/overlayfs/super.c
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@ -1460,7 +1460,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
ovl_trusted_xattr_handlers; ovl_trusted_xattr_handlers;
sb->s_fs_info = ofs; sb->s_fs_info = ofs;
sb->s_flags |= SB_POSIXACL; 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; err = -ENOMEM;
root_dentry = ovl_get_root(sb, ctx->upper.dentry, oe); root_dentry = ovl_get_root(sb, ctx->upper.dentry, oe);