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authorOleg Nesterov <oleg@redhat.com>2013-08-08 18:55:32 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2013-08-08 13:11:39 -0700
commit8742f229b635bf1c1c84a3dfe5e47c814c20b5c8 (patch)
tree3d9f64cf0c9d705b9f422d137c8067fa2d41f3c8
parent55f5bfd4c94b923d965d47f5c1889ef8f98fcef1 (diff)
downloadlinux-stericsson-8742f229b635bf1c1c84a3dfe5e47c814c20b5c8.tar.gz
userns: limit the maximum depth of user_namespace->parent chain
Ensure that user_namespace->parent chain can't grow too much. Currently we use the hardroded 32 as limit. Reported-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/user_namespace.h1
-rw-r--r--kernel/user_namespace.c4
2 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index b6b215f13b45..14105c26a836 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -23,6 +23,7 @@ struct user_namespace {
struct uid_gid_map projid_map;
atomic_t count;
struct user_namespace *parent;
+ int level;
kuid_t owner;
kgid_t group;
unsigned int proc_inum;
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 6e50a44610ee..9064b919a406 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -62,6 +62,9 @@ int create_user_ns(struct cred *new)
kgid_t group = new->egid;
int ret;
+ if (parent_ns->level > 32)
+ return -EUSERS;
+
/*
* Verify that we can not violate the policy of which files
* may be accessed that is specified by the root directory,
@@ -92,6 +95,7 @@ int create_user_ns(struct cred *new)
atomic_set(&ns->count, 1);
/* Leave the new->user_ns reference with the new user namespace. */
ns->parent = parent_ns;
+ ns->level = parent_ns->level + 1;
ns->owner = owner;
ns->group = group;