aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--include/linux/utsname.h4
-rw-r--r--init/version.c1
-rw-r--r--kernel/nsproxy.c5
-rw-r--r--kernel/user.c8
-rw-r--r--kernel/utsname.c4
5 files changed, 20 insertions, 2 deletions
diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index 69f3997..2c3c0f5 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h
@@ -37,9 +37,13 @@ struct new_utsname {
#include <linux/nsproxy.h>
#include <linux/err.h>
+struct user_namespace;
+extern struct user_namespace init_user_ns;
+
struct uts_namespace {
struct kref kref;
struct new_utsname name;
+ struct user_namespace *user_ns;
};
extern struct uts_namespace init_uts_ns;
diff --git a/init/version.c b/init/version.c
index adff586..86fe0cc 100644
--- a/init/version.c
+++ b/init/version.c
@@ -33,6 +33,7 @@ struct uts_namespace init_uts_ns = {
.machine = UTS_MACHINE,
.domainname = UTS_DOMAINNAME,
},
+ .user_ns = &init_user_ns,
};
EXPORT_SYMBOL_GPL(init_uts_ns);
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index f74e6c0..034dc2e 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -74,6 +74,11 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
err = PTR_ERR(new_nsp->uts_ns);
goto out_uts;
}
+ if (new_nsp->uts_ns != tsk->nsproxy->uts_ns) {
+ put_user_ns(new_nsp->uts_ns->user_ns);
+ new_nsp->uts_ns->user_ns = task_cred_xxx(tsk, user)->user_ns;
+ get_user_ns(new_nsp->uts_ns->user_ns);
+ }
new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns);
if (IS_ERR(new_nsp->ipc_ns)) {
diff --git a/kernel/user.c b/kernel/user.c
index 5c598ca..9e03e9c 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -17,9 +17,13 @@
#include <linux/module.h>
#include <linux/user_namespace.h>
+/*
+ * userns count is 1 for root user, 1 for init_uts_ns,
+ * and 1 for... ?
+ */
struct user_namespace init_user_ns = {
.kref = {
- .refcount = ATOMIC_INIT(2),
+ .refcount = ATOMIC_INIT(3),
},
.creator = &root_user,
};
@@ -47,7 +51,7 @@ static struct kmem_cache *uid_cachep;
*/
static DEFINE_SPINLOCK(uidhash_lock);
-/* root_user.__count is 2, 1 for init task cred, 1 for init_user_ns->creator */
+/* root_user.__count is 2, 1 for init task cred, 1 for init_user_ns->user_ns */
struct user_struct root_user = {
.__count = ATOMIC_INIT(2),
.processes = ATOMIC_INIT(1),
diff --git a/kernel/utsname.c b/kernel/utsname.c
index 8a82b4b..a7b3a8d 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -14,6 +14,7 @@
#include <linux/utsname.h>
#include <linux/err.h>
#include <linux/slab.h>
+#include <linux/user_namespace.h>
static struct uts_namespace *create_uts_ns(void)
{
@@ -40,6 +41,8 @@ static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
down_read(&uts_sem);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
+ ns->user_ns = old_ns->user_ns;
+ get_user_ns(ns->user_ns);
up_read(&uts_sem);
return ns;
}
@@ -71,5 +74,6 @@ void free_uts_ns(struct kref *kref)
struct uts_namespace *ns;
ns = container_of(kref, struct uts_namespace, kref);
+ put_user_ns(ns->user_ns);
kfree(ns);
}