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authorEric W. Biederman <ebiederm@xmission.com>2012-12-28 18:58:39 -0800
committerEric W. Biederman <ebiederm@xmission.com>2013-01-26 22:11:41 -0800
commitc61a2810a2161986353705b44d9503e6bb079f4f (patch)
tree1f949f359d0344c2a47c8d0c597815aceb8091c0 /kernel/user.c
parent923c7538236564c46ee80c253a416705321f13e3 (diff)
downloadvexpress-lsk-c61a2810a2161986353705b44d9503e6bb079f4f.tar.gz
userns: Avoid recursion in put_user_ns
When freeing a deeply nested user namespace free_user_ns calls put_user_ns on it's parent which may in turn call free_user_ns again. When -fno-optimize-sibling-calls is passed to gcc one stack frame per user namespace is left on the stack, potentially overflowing the kernel stack. CONFIG_FRAME_POINTER forces -fno-optimize-sibling-calls so we can't count on gcc to optimize this code. Remove struct kref and use a plain atomic_t. Making the code more flexible and easier to comprehend. Make the loop in free_user_ns explict to guarantee that the stack does not overflow with CONFIG_FRAME_POINTER enabled. I have tested this fix with a simple program that uses unshare to create a deeply nested user namespace structure and then calls exit. With 1000 nesteuser namespaces before this change running my test program causes the kernel to die a horrible death. With 10,000,000 nested user namespaces after this change my test program runs to completion and causes no harm. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Pointed-out-by: Vasily Kulikov <segoon@openwall.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/user.c')
-rw-r--r--kernel/user.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/user.c b/kernel/user.c
index 33acb5e53a5..57ebfd42023 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -47,9 +47,7 @@ struct user_namespace init_user_ns = {
.count = 4294967295U,
},
},
- .kref = {
- .refcount = ATOMIC_INIT(3),
- },
+ .count = ATOMIC_INIT(3),
.owner = GLOBAL_ROOT_UID,
.group = GLOBAL_ROOT_GID,
.proc_inum = PROC_USER_INIT_INO,