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From c11b9fdd6a612f376a5e886505f1c54c16d8c380 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@redhat.com>
Date: Thu, 1 Sep 2016 11:11:59 +0200
Subject: [PATCH] ovl: remove posix_acl_default from workdir
Clear out posix acl xattrs on workdir and also reset the mode after
creation so that an inherited sgid bit is cleared.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: <stable@vger.kernel.org>
---
fs/overlayfs/super.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -773,6 +773,10 @@ retry:
struct kstat stat = {
.mode = S_IFDIR | 0,
};
+ struct iattr attr = {
+ .ia_valid = ATTR_MODE,
+ .ia_mode = stat.mode,
+ };
if (work->d_inode) {
err = -EEXIST;
@@ -788,6 +792,21 @@ retry:
err = ovl_create_real(dir, work, &stat, NULL, NULL, true);
if (err)
goto out_dput;
+
+ err = vfs_removexattr(work, XATTR_NAME_POSIX_ACL_DEFAULT);
+ if (err && err != -ENODATA)
+ goto out_dput;
+
+ err = vfs_removexattr(work, XATTR_NAME_POSIX_ACL_ACCESS);
+ if (err && err != -ENODATA)
+ goto out_dput;
+
+ /* Clear any inherited mode bits */
+ mutex_lock(&work->d_inode->i_mutex);
+ err = notify_change(work, &attr, NULL);
+ mutex_unlock(&work->d_inode->i_mutex);
+ if (err)
+ goto out_dput;
}
out_unlock:
mutex_unlock(&dir->i_mutex);
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