From b2e0d98705e60e45bbb3c0032c48824ad7ae0704 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 26 Jul 2012 05:15:35 -0700 Subject: userns: Implement unshare of the user namespace - Add CLONE_THREAD to the unshare flags if CLONE_NEWUSER is selected As changing user namespaces is only valid if all there is only a single thread. - Restore the code to add CLONE_VM if CLONE_THREAD is selected and the code to addCLONE_SIGHAND if CLONE_VM is selected. Making the constraints in the code clear. Acked-by: Serge Hallyn Signed-off-by: "Eric W. Biederman" --- kernel/nsproxy.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'kernel/nsproxy.c') diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index 2ddd81657a2a..78e2ecb20165 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -186,7 +186,7 @@ void free_nsproxy(struct nsproxy *ns) * On success, returns the new nsproxy. */ int unshare_nsproxy_namespaces(unsigned long unshare_flags, - struct nsproxy **new_nsp, struct fs_struct *new_fs) + struct nsproxy **new_nsp, struct cred *new_cred, struct fs_struct *new_fs) { struct user_namespace *user_ns; int err = 0; @@ -195,12 +195,12 @@ int unshare_nsproxy_namespaces(unsigned long unshare_flags, CLONE_NEWNET | CLONE_NEWPID))) return 0; - if (!nsown_capable(CAP_SYS_ADMIN)) + user_ns = new_cred ? new_cred->user_ns : current_user_ns(); + if (!ns_capable(user_ns, CAP_SYS_ADMIN)) return -EPERM; - user_ns = current_user_ns(); *new_nsp = create_new_namespaces(unshare_flags, current, user_ns, - new_fs ? new_fs : current->fs); + new_fs ? new_fs : current->fs); if (IS_ERR(*new_nsp)) { err = PTR_ERR(*new_nsp); goto out; -- cgit v1.2.3-59-g8ed1b