From b24be4acd17a8963a29b2a92e1d80b9ddf759c95 Mon Sep 17 00:00:00 2001 From: Vivek Goyal Date: Fri, 1 Jul 2016 16:34:27 -0400 Subject: ovl: modify ovl_permission() to do checks on two inodes commit c0ca3d70e8d3cf81e2255a217f7ca402f5ed0862 upstream. Right now ovl_permission() calls __inode_permission(realinode), to do permission checks on real inode and no checks are done on overlay inode. Modify it to do checks both on overlay inode as well as underlying inode. Checks on overlay inode will be done with the creds of calling task while checks on underlying inode will be done with the creds of mounter. Signed-off-by: Vivek Goyal Signed-off-by: Miklos Szeredi [ Srivatsa: 4.4.y backport: - Skipped the hunk modifying non-existent function ovl_get_acl() - Adjusted the error path - Included linux/cred.h to get prototype for revert_creds() ] Signed-off-by: Srivatsa S. Bhat (VMware) Signed-off-by: Greg Kroah-Hartman --- fs/overlayfs/inode.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'fs/overlayfs') diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 985a4cdae06d..9aff8178aa8c 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -9,6 +9,7 @@ #include #include +#include #include #include "overlayfs.h" @@ -91,6 +92,7 @@ int ovl_permission(struct inode *inode, int mask) struct ovl_entry *oe; struct dentry *alias = NULL; struct inode *realinode; + const struct cred *old_cred; struct dentry *realdentry; bool is_upper; int err; @@ -143,7 +145,18 @@ int ovl_permission(struct inode *inode, int mask) goto out_dput; } + /* + * Check overlay inode with the creds of task and underlying inode + * with creds of mounter + */ + err = generic_permission(inode, mask); + if (err) + goto out_dput; + + old_cred = ovl_override_creds(inode->i_sb); err = __inode_permission(realinode, mask); + revert_creds(old_cred); + out_dput: dput(alias); return err; -- cgit v1.2.3