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authorEric W. Biederman <ebiederm@xmission.com>2013-03-26 07:07:01 +0400
committerEric W. Biederman <ebiederm@xmission.com>2013-08-29 08:35:14 +0400
commit7dc5dbc879bd0779924b5132a48b731a0bc04a1e (patch)
treebcae7323006aa19fc91c27fdb156667c9a061809 /include/linux/kobject_ns.h
parente51db73532955dc5eaba4235e62b74b460709d5b (diff)
downloadlinux-7dc5dbc879bd0779924b5132a48b731a0bc04a1e.tar.xz
sysfs: Restrict mounting sysfs
Don't allow mounting sysfs unless the caller has CAP_SYS_ADMIN rights over the net namespace. The principle here is if you create or have capabilities over it you can mount it, otherwise you get to live with what other people have mounted. Instead of testing this with a straight forward ns_capable call, perform this check the long and torturous way with kobject helpers, this keeps direct knowledge of namespaces out of sysfs, and preserves the existing sysfs abstractions. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/kobject_ns.h')
-rw-r--r--include/linux/kobject_ns.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kobject_ns.h b/include/linux/kobject_ns.h
index f66b065a8b5f..df32d2508290 100644
--- a/include/linux/kobject_ns.h
+++ b/include/linux/kobject_ns.h
@@ -39,6 +39,7 @@ enum kobj_ns_type {
*/
struct kobj_ns_type_operations {
enum kobj_ns_type type;
+ bool (*current_may_mount)(void);
void *(*grab_current_ns)(void);
const void *(*netlink_ns)(struct sock *sk);
const void *(*initial_ns)(void);
@@ -50,6 +51,7 @@ int kobj_ns_type_registered(enum kobj_ns_type type);
const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent);
const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj);
+bool kobj_ns_current_may_mount(enum kobj_ns_type type);
void *kobj_ns_grab_current(enum kobj_ns_type type);
const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk);
const void *kobj_ns_initial(enum kobj_ns_type type);