From 2c7ab1423973cfb50e1226e6608a1d454e702c90 Mon Sep 17 00:00:00 2001
From: Seth Forshee <seth.forshee@canonical.com>
Date: Tue, 19 Jan 2016 13:12:02 -0600
Subject: [PATCH] UBUNTU: SAUCE: overlayfs: Skip permission checking for
 trusted.overlayfs.* xattrs

The original mounter had CAP_SYS_ADMIN in the user namespace
where the mount happened, and the vfs has validated that the user
has permission to do the requested operation. This is sufficient
for allowing the kernel to write these specific xattrs, so we can
bypass the permission checks for these xattrs.

To support this, export __vfs_setxattr_noperm and add an similar
__vfs_removexattr_noperm which is also exported. Use these when
setting or removing trusted.overlayfs.* xattrs.

BugLink: http://bugs.launchpad.net/bugs/1531747
BugLink: http://bugs.launchpad.net/bugs/1534961
BugLink: http://bugs.launchpad.net/bugs/1535150
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
---
 fs/overlayfs/overlayfs.h | 16 +++++++++++++---
 fs/xattr.c               | 36 ++++++++++++++++++++++++++++++------
 include/linux/xattr.h    |  1 +
 3 files changed, 44 insertions(+), 9 deletions(-)

diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 1df7f850ff3bb..e523d600da4e8 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -251,8 +251,12 @@ static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
 				  const char *name, const void *value,
 				  size_t size, int flags)
 {
-	int err = vfs_setxattr(ovl_upper_mnt_userns(ofs), dentry, name,
-			       value, size, flags);
+	struct inode *inode = dentry->d_inode;
+	int err;
+
+	inode_lock(inode);
+	err = __vfs_setxattr_noperm(&init_user_ns, dentry, name, value, size, flags);
+	inode_unlock(inode);
 
 	pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n",
 		 dentry, name, min((int)size, 48), value, size, flags, err);
@@ -269,7 +273,13 @@ static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
 static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
 				     const char *name)
 {
-	int err = vfs_removexattr(ovl_upper_mnt_userns(ofs), dentry, name);
+	struct inode *inode = dentry->d_inode;
+	int err;
+
+	inode_lock(inode);
+	err = __vfs_removexattr_noperm(&init_user_ns, dentry, name);
+	inode_unlock(inode);
+
 	pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
 	return err;
 }
diff --git a/fs/xattr.c b/fs/xattr.c
index adab9a70b5368..76dc91ec7ae84 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -259,6 +259,7 @@ int __vfs_setxattr_noperm(struct user_namespace *mnt_userns,
 
 	return error;
 }
+EXPORT_SYMBOL_GPL(__vfs_setxattr_noperm);
 
 /**
  * __vfs_setxattr_locked - set an extended attribute while holding the inode
@@ -499,6 +500,34 @@ __vfs_removexattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 }
 EXPORT_SYMBOL(__vfs_removexattr);
 
+/**
+ *  __vfs_removexattr_noperm - perform removexattr operation without
+ *  performing permission checks.
+ *
+ *  @dentry - object to perform setxattr on
+ *  @name - xattr name to set
+ *
+ *  returns the result of the internal setxattr or setsecurity operations.
+ *
+ *  This function requires the caller to lock the inode's i_mutex before it
+ *  is executed. It also assumes that the caller will make the appropriate
+ *  permission checks.
+ */
+int
+__vfs_removexattr_noperm(struct user_namespace *mnt_userns,
+			 struct dentry *dentry, const char *name)
+{
+	int error;
+
+	error =__vfs_removexattr(mnt_userns, dentry, name);
+	if (!error) {
+		fsnotify_xattr(dentry);
+		evm_inode_post_removexattr(dentry, name);
+	}
+	return error;
+}
+EXPORT_SYMBOL_GPL(__vfs_removexattr_noperm);
+
 /**
  * __vfs_removexattr_locked - set an extended attribute while holding the inode
  * lock
@@ -529,12 +558,7 @@ __vfs_removexattr_locked(struct user_namespace *mnt_userns,
 	if (error)
 		goto out;
 
-	error = __vfs_removexattr(mnt_userns, dentry, name);
-
-	if (!error) {
-		fsnotify_xattr(dentry);
-		evm_inode_post_removexattr(dentry, name);
-	}
+	error = __vfs_removexattr_noperm(mnt_userns, dentry, name);
 
 out:
 	return error;
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 2e7dd44926e4a..149b148625da4 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -69,6 +69,7 @@ int __vfs_setxattr_locked(struct user_namespace *, struct dentry *,
 int vfs_setxattr(struct user_namespace *, struct dentry *, const char *,
 		 const void *, size_t, int);
 int __vfs_removexattr(struct user_namespace *, struct dentry *, const char *);
+int __vfs_removexattr_noperm(struct user_namespace *, struct dentry *, const char *);
 int __vfs_removexattr_locked(struct user_namespace *, struct dentry *,
 			     const char *, struct inode **);
 int vfs_removexattr(struct user_namespace *, struct dentry *, const char *);