From 142e1d1d5f088e7a38659daca6e84a730967774a Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 26 Jul 2012 01:13:20 -0700 Subject: userns: Allow unprivileged use of setns. - Push the permission check from the core setns syscall into the setns install methods where the user namespace of the target namespace can be determined, and used in a ns_capable call. Acked-by: Serge Hallyn Signed-off-by: "Eric W. Biederman" --- kernel/utsname.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'kernel/utsname.c') diff --git a/kernel/utsname.c b/kernel/utsname.c index 679d97a5d3fd..4a9362f9325d 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -102,8 +102,13 @@ static void utsns_put(void *ns) put_uts_ns(ns); } -static int utsns_install(struct nsproxy *nsproxy, void *ns) +static int utsns_install(struct nsproxy *nsproxy, void *new) { + struct uts_namespace *ns = new; + + if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN)) + return -EPERM; + get_uts_ns(ns); put_uts_ns(nsproxy->uts_ns); nsproxy->uts_ns = ns; -- cgit v1.2.3-58-ga151