4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Eric W. Biederman" <ebied...@xmission.com>
[ Upstream commit 75422726b0f717d67db3283c2eb5bc14fa2619c5 ]
Add MS_KERNMOUNT to the flags that are passed.
Use sget_userns and force &init_user_ns instead of calling sget so that
even if called from a weird context the internal filesystem will be
considered to be in the intial user namespace.
Luis Ressel reported that the the failure to pass MS_KERNMOUNT into
mount_pseudo broke his in development graphics driver that uses the
generic drm infrastructure. I am not certain the deriver was bug
free in it's usage of that infrastructure but since
mount_pseudo_xattr can never be triggered by userspace it is clearer
and less error prone, and less problematic for the code to be explicit.
Reported-by: Luis Ressel <ara...@aixah.de>
Tested-by: Luis Ressel <ara...@aixah.de>
Acked-by: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: "Eric W. Biederman" <ebied...@xmission.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/libfs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -245,7 +245,8 @@ struct dentry *mount_pseudo_xattr(struct
struct inode *root;
struct qstr d_name = QSTR_INIT(name, strlen(name));
- s = sget(fs_type, NULL, set_anon_super, MS_NOUSER, NULL);
+ s = sget_userns(fs_type, NULL, set_anon_super, MS_KERNMOUNT|MS_NOUSER,
+ &init_user_ns, NULL);
if (IS_ERR(s))
return ERR_CAST(s);
