[PATCH review 13/16] userns: Allow unprivilged mounts of proc and sysfs

[Eric W. Biederman]

From: "Eric W. Biederman" <ebiederm at xmission.com>

- The context in which proc and sysfs are mounted have no
  effect on the the uid/gid of their files so no conversion is
  needed except allowing the mount.

Acked-by: Serge Hallyn <serge.hallyn at canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm at xmission.com>
---
 fs/proc/root.c   |    1 +
 fs/sysfs/mount.c |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/proc/root.c b/fs/proc/root.c
index f2f2511..c6e9fac 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -145,6 +145,7 @@ static struct file_system_type proc_fs_type = {
 	.name		= "proc",
 	.mount		= proc_mount,
 	.kill_sb	= proc_kill_sb,
+	.fs_flags	= FS_USERNS_MOUNT,
 };
 
 void __init proc_root_init(void)
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 71eb7e2..db940a9 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -149,6 +149,7 @@ static struct file_system_type sysfs_fs_type = {
 	.name		= "sysfs",
 	.mount		= sysfs_mount,
 	.kill_sb	= sysfs_kill_sb,
+	.fs_flags	= FS_USERNS_MOUNT,
 };
 
 int __init sysfs_init(void)
-- 
1.7.5.4