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Commit 81abe27b authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

userns: Fix link restrictions to use uid_eq 



Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
parent d7555860

fs/namei.c

+3 −3
Original line number Diff line number Diff line
@@ -678,7 +678,7 @@ static inline int may_follow_link(struct path *link, struct nameidata *nd) 


	/* Allowed if owner and follower match. */

	inode = link->dentry->d_inode;

	if (current_cred()->fsuid == inode->i_uid)

	if (uid_eq(current_cred()->fsuid, inode->i_uid))

		return 0;



	/* Allowed if parent directory not sticky and world-writable. */
@@ -687,7 +687,7 @@ static inline int may_follow_link(struct path *link, struct nameidata *nd) 
		return 0;



	/* Allowed if parent directory and link owner match. */

	if (parent->i_uid == inode->i_uid)

	if (uid_eq(parent->i_uid, inode->i_uid))

		return 0;



	path_put_conditional(link, nd);
@@ -757,7 +757,7 @@ static int may_linkat(struct path *link) 
	/* Source inode owner (or CAP_FOWNER) can hardlink all they like,

	 * otherwise, it must be a safe source.

	 */

	if (cred->fsuid == inode->i_uid || safe_hardlink_source(inode) ||

	if (uid_eq(cred->fsuid, inode->i_uid) || safe_hardlink_source(inode) ||

	    capable(CAP_FOWNER))

		return 0;