summaryrefslogtreecommitdiff
path: root/include/linux/user_namespace.h
diff options
context:
space:
mode:
authorSerge E. Hallyn <serue@us.ibm.com>2007-07-16 10:41:01 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 20:05:47 +0400
commit77ec739d8d0979477fc91f530403805afa2581a4 (patch)
tree0cefb80a7ff8d57a8f735954fdeb88e9efbaf05c /include/linux/user_namespace.h
parentacce292c82d4d82d35553b928df2b0597c3a9c78 (diff)
downloadlinux-77ec739d8d0979477fc91f530403805afa2581a4.tar.xz
user namespace: add unshare
This patch enables the unshare of user namespaces. It adds a new clone flag CLONE_NEWUSER and implements copy_user_ns() which resets the current user_struct and adds a new root user (uid == 0) For now, unsharing the user namespace allows a process to reset its user_struct accounting and uid 0 in the new user namespace should be contained using appropriate means, for instance selinux The plan, when the full support is complete (all uid checks covered), is to keep the original user's rights in the original namespace, and let a process become uid 0 in the new namespace, with full capabilities to the new namespace. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Acked-by: Pavel Emelianov <xemul@openvz.org> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Kirill Korotaev <dev@sw.ru> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: James Morris <jmorris@namei.org> Cc: Andrew Morgan <agm@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/user_namespace.h')
-rw-r--r--include/linux/user_namespace.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 92a45867ecfb..bb320573bb9e 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -4,6 +4,7 @@
#include <linux/kref.h>
#include <linux/nsproxy.h>
#include <linux/sched.h>
+#include <linux/err.h>
#define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 8)
#define UIDHASH_SZ (1 << UIDHASH_BITS)
@@ -45,6 +46,9 @@ static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
static inline struct user_namespace *copy_user_ns(int flags,
struct user_namespace *old_ns)
{
+ if (flags & CLONE_NEWUSER)
+ return ERR_PTR(-EINVAL);
+
return NULL;
}