tree d9f1ced0d47070fcdf8b399021f33770c150b1ec
parent 39fd33933b0209e4b6254743f2cede07c5ad4c52
author Serge E. Hallyn <serge@hallyn.com> 1300923800 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1300934825 -0700

userns: allow ptrace from non-init user namespaces

ptrace is allowed to tasks in the same user namespace according to the
usual rules (i.e.  the same rules as for two tasks in the init user
namespace).  ptrace is also allowed to a user namespace to which the
current task the has CAP_SYS_PTRACE capability.

Changelog:
	Dec 31: Address feedback by Eric:
		. Correct ptrace uid check
		. Rename may_ptrace_ns to ptrace_capable
		. Also fix the cap_ptrace checks.
	Jan  1: Use const cred struct
	Jan 11: use task_ns_capable() in place of ptrace_capable().
	Feb 23: same_or_ancestore_user_ns() was not an appropriate
		check to constrain cap_issubset.  Rather, cap_issubset()
		only is meaningful when both capsets are in the same
		user_ns.

Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Acked-by: David Howells <dhowells@redhat.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>