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authorOleg Nesterov <oleg@redhat.com>2013-08-08 18:55:32 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-11 18:35:25 -0700
commit5c5f9cd2b539879c4291fa24773795314e777354 (patch)
treefcda00e4125fa6c70a067e87ad08bab634c1996f /kernel/user_namespace.c
parentc98ebcb618645d40cfec14b0534ff32126c114ce (diff)
userns: limit the maximum depth of user_namespace->parent chain
commit 8742f229b635bf1c1c84a3dfe5e47c814c20b5c8 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/user_namespace.c')
-rw-r--r--kernel/user_namespace.c4
1 files changed, 4 insertions, 0 deletions
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;