From 2b8576cb09a7b1b581c253554bf9e05d3adce7d6 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Fri, 25 Jan 2013 16:32:10 -0800
Subject: [PATCH] userns: Allow the userns root to mount tmpfs.
There is no backing store to tmpfs and file creation rules are the
same as for any other filesystem so it is semantically safe to allow
unprivileged users to mount it. ramfs is safe for the same reasons so
allow either flavor of tmpfs to be mounted by a user namespace root
user.
The memory control group successfully limits how much memory tmpfs can
consume on any system that cares about a user namespace root using
tmpfs to exhaust memory the memory control group can be deployed.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
mm/shmem.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/shmem.c b/mm/shmem.c
index 5c90d84c2b02..197ca5eccbae 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2766,6 +2766,7 @@ static struct file_system_type shmem_fs_type = {
.name = "tmpfs",
.mount = shmem_mount,
.kill_sb = kill_litter_super,
+ .fs_flags = FS_USERNS_MOUNT,
};
int __init shmem_init(void)
@@ -2823,6 +2824,7 @@ static struct file_system_type shmem_fs_type = {
.name = "tmpfs",
.mount = ramfs_mount,
.kill_sb = kill_litter_super,
+ .fs_flags = FS_USERNS_MOUNT,
};
int __init shmem_init(void)