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:
parent
9f91164061
commit
18b44bc5a6
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@ -1460,7 +1460,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
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ovl_trusted_xattr_handlers;
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sb->s_fs_info = ofs;
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sb->s_flags |= SB_POSIXACL;
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sb->s_iflags |= SB_I_SKIP_SYNC;
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sb->s_iflags |= SB_I_SKIP_SYNC | SB_I_IMA_UNVERIFIABLE_SIGNATURE;
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err = -ENOMEM;
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root_dentry = ovl_get_root(sb, ctx->upper.dentry, oe);
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