From 5e4a08476b50fa39210fca82e03325cc46b9c235 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Fri, 14 Dec 2012 07:55:36 -0800 Subject: [PATCH] userns: Require CAP_SYS_ADMIN for most uses of setns. Andy Lutomirski found a nasty little bug in the permissions of setns. With unprivileged user namespaces it became possible to create new namespaces without privilege. However the setns calls were relaxed to only require CAP_SYS_ADMIN in the user nameapce of the targed namespace. Which made the following nasty sequence possible. pid = clone(CLONE_NEWUSER | CLONE_NEWNS); if (pid == 0) { /* child */ system("mount --bind /home/me/passwd /etc/passwd"); } else if (pid != 0) { /* parent */ char path[PATH_MAX]; snprintf(path, sizeof(path), "/proc/%u/ns/mnt"); fd = open(path, O_RDONLY); setns(fd, 0); system("su -"); } Prevent this possibility by requiring CAP_SYS_ADMIN in the current user namespace when joing all but the user namespace. Acked-by: Serge Hallyn Signed-off-by: "Eric W. Biederman" --- fs/namespace.c | 3 ++- ipc/namespace.c | 3 ++- kernel/pid_namespace.c | 3 ++- kernel/utsname.c | 3 ++- net/core/net_namespace.c | 3 ++- 5 files changed, 10 insertions(+), 5 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index c1bbe86f492..398a50ff243 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -2781,7 +2781,8 @@ static int mntns_install(struct nsproxy *nsproxy, void *ns) struct path root; if (!ns_capable(mnt_ns->user_ns, CAP_SYS_ADMIN) || - !nsown_capable(CAP_SYS_CHROOT)) + !nsown_capable(CAP_SYS_CHROOT) || + !nsown_capable(CAP_SYS_ADMIN)) return -EPERM; if (fs->users != 1) diff --git a/ipc/namespace.c b/ipc/namespace.c index cf3386a51de..7c1fa451b0b 100644 --- a/ipc/namespace.c +++ b/ipc/namespace.c @@ -170,7 +170,8 @@ static void ipcns_put(void *ns) static int ipcns_install(struct nsproxy *nsproxy, void *new) { struct ipc_namespace *ns = new; - if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN)) + if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) || + !nsown_capable(CAP_SYS_ADMIN)) return -EPERM; /* Ditch state from the old ipc namespace */ diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 560da0dab23..fdbd0cdf271 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -325,7 +325,8 @@ static int pidns_install(struct nsproxy *nsproxy, void *ns) struct pid_namespace *active = task_active_pid_ns(current); struct pid_namespace *ancestor, *new = ns; - if (!ns_capable(new->user_ns, CAP_SYS_ADMIN)) + if (!ns_capable(new->user_ns, CAP_SYS_ADMIN) || + !nsown_capable(CAP_SYS_ADMIN)) return -EPERM; /* diff --git a/kernel/utsname.c b/kernel/utsname.c index f6336d51d64..08b197e8c48 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -113,7 +113,8 @@ static int utsns_install(struct nsproxy *nsproxy, void *new) { struct uts_namespace *ns = new; - if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN)) + if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) || + !nsown_capable(CAP_SYS_ADMIN)) return -EPERM; get_uts_ns(ns); diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index 2e9a3132b8d..8acce01b6da 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -649,7 +649,8 @@ static int netns_install(struct nsproxy *nsproxy, void *ns) { struct net *net = ns; - if (!ns_capable(net->user_ns, CAP_SYS_ADMIN)) + if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) || + !nsown_capable(CAP_SYS_ADMIN)) return -EPERM; put_net(nsproxy->net_ns);