userns: Better restrictions on when proc and sysfs can be mounted

Get series with b4

b4 am [email protected]

Versions newest first

#	Subject and files	Size	Replies	Applied
1/2	userns: Better restrictions on when proc and sysfs can be mounted`fs/namespace.c` `fs/proc/root.c` `fs/sysfs/mount.c` +4 more	+33 ~~-23~~	18 replies
2/2	sysfs: Restrict mounting sysfs`fs/sysfs/mount.c` `include/linux/kobject_ns.h` `lib/kobject.c` +1 more	+31 -3	4 replies

1 of 2 patches has a Reviewed-by or Acked-by.

Patch	Greg Kroah-Hartman	James Hogan
1/2
2/2	A-b A-b	T-b

Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.