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ovl: verify upper root dir matches lower root dir

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When inodes index feature is enabled, verify that the file handle stored
in upper root dir matches the lower root dir or fail to mount.

If upper root dir has no stored file handle, encode and store the lower
root dir file handle in overlay.origin xattr.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2017-06-21 15:28:37 +03:00
committed by Miklos Szeredi
parent 02bcd15774
commit 8b88a2e640
4 changed files with 101 additions and 15 deletions
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8
fs/overlayfs/super.c
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@@ -1048,6 +1048,14 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
ufs->same_sb = NULL;
if (!(ovl_force_readonly(ufs)) && ufs->config.index) {
/* Verify lower root is upper root origin */
err = ovl_verify_origin(upperpath.dentry, ufs->lower_mnt[0],
stack[0].dentry, true);
if (err) {
pr_err("overlayfs: failed to verify upper root origin\n");
goto out_put_lower_mnt;
}
ufs->indexdir = ovl_workdir_create(sb, ufs, workpath.dentry,
OVL_INDEXDIR_NAME, true);
err = PTR_ERR(ufs->indexdir);