This is a note to let you know that I've just added the patch titled
[PATCH 08/28] phonet: Check input from user before allocating
to the 3.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
phonet-check-input-from-user-before-allocating.patch
and it can be found in the queue-3.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c06596fcd60d3a5bfb03f9d3fd21fd6956fc2bd6 Mon Sep 17 00:00:00 2001
From: Sasha Levin <[email protected]>
Date: Thu, 5 Apr 2012 12:07:45 +0000
Subject: [PATCH 08/28] phonet: Check input from user before allocating
From: Sasha Levin <[email protected]>
[ Upstream commit bcf1b70ac6eb0ed8286c66e6bf37cb747cbaa04c ]
A phonet packet is limited to USHRT_MAX bytes, this is never checked during
tx which means that the user can specify any size he wishes, and the kernel
will attempt to allocate that size.
In the good case, it'll lead to the following warning, but it may also cause
the kernel to kick in the OOM and kill a random task on the server.
[ 8921.744094] WARNING: at mm/page_alloc.c:2255
__alloc_pages_slowpath+0x65/0x730()
[ 8921.749770] Pid: 5081, comm: trinity Tainted: G W
3.4.0-rc1-next-20120402-sasha #46
[ 8921.756672] Call Trace:
[ 8921.758185] [<ffffffff810b2ba7>] warn_slowpath_common+0x87/0xb0
[ 8921.762868] [<ffffffff810b2be5>] warn_slowpath_null+0x15/0x20
[ 8921.765399] [<ffffffff8117eae5>] __alloc_pages_slowpath+0x65/0x730
[ 8921.769226] [<ffffffff81179c8a>] ? zone_watermark_ok+0x1a/0x20
[ 8921.771686] [<ffffffff8117d045>] ? get_page_from_freelist+0x625/0x660
[ 8921.773919] [<ffffffff8117f3a8>] __alloc_pages_nodemask+0x1f8/0x240
[ 8921.776248] [<ffffffff811c03e0>] kmalloc_large_node+0x70/0xc0
[ 8921.778294] [<ffffffff811c4bd4>] __kmalloc_node_track_caller+0x34/0x1c0
[ 8921.780847] [<ffffffff821b0e3c>] ? sock_alloc_send_pskb+0xbc/0x260
[ 8921.783179] [<ffffffff821b3c65>] __alloc_skb+0x75/0x170
[ 8921.784971] [<ffffffff821b0e3c>] sock_alloc_send_pskb+0xbc/0x260
[ 8921.787111] [<ffffffff821b002e>] ? release_sock+0x7e/0x90
[ 8921.788973] [<ffffffff821b0ff0>] sock_alloc_send_skb+0x10/0x20
[ 8921.791052] [<ffffffff824cfc20>] pep_sendmsg+0x60/0x380
[ 8921.792931] [<ffffffff824cb4a6>] ? pn_socket_bind+0x156/0x180
[ 8921.794917] [<ffffffff824cb50f>] ? pn_socket_autobind+0x3f/0x90
[ 8921.797053] [<ffffffff824cb63f>] pn_socket_sendmsg+0x4f/0x70
[ 8921.798992] [<ffffffff821ab8e7>] sock_aio_write+0x187/0x1b0
[ 8921.801395] [<ffffffff810e325e>] ? sub_preempt_count+0xae/0xf0
[ 8921.803501] [<ffffffff8111842c>] ? __lock_acquire+0x42c/0x4b0
[ 8921.805505] [<ffffffff821ab760>] ? __sock_recv_ts_and_drops+0x140/0x140
[ 8921.807860] [<ffffffff811e07cc>] do_sync_readv_writev+0xbc/0x110
[ 8921.809986] [<ffffffff811958e7>] ? might_fault+0x97/0xa0
[ 8921.811998] [<ffffffff817bd99e>] ? security_file_permission+0x1e/0x90
[ 8921.814595] [<ffffffff811e17e2>] do_readv_writev+0xe2/0x1e0
[ 8921.816702] [<ffffffff810b8dac>] ? do_setitimer+0x1ac/0x200
[ 8921.818819] [<ffffffff810e2ec1>] ? get_parent_ip+0x11/0x50
[ 8921.820863] [<ffffffff810e325e>] ? sub_preempt_count+0xae/0xf0
[ 8921.823318] [<ffffffff811e1926>] vfs_writev+0x46/0x60
[ 8921.825219] [<ffffffff811e1a3f>] sys_writev+0x4f/0xb0
[ 8921.827127] [<ffffffff82658039>] system_call_fastpath+0x16/0x1b
[ 8921.829384] ---[ end trace dffe390f30db9eb7 ]---
Signed-off-by: Sasha Levin <[email protected]>
Acked-by: Rémi Denis-Courmont <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/phonet/pep.c | 3 +++
1 file changed, 3 insertions(+)
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -1130,6 +1130,9 @@ static int pep_sendmsg(struct kiocb *ioc
int flags = msg->msg_flags;
int err, done;
+ if (len > USHRT_MAX)
+ return -EMSGSIZE;
+
if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
MSG_CMSG_COMPAT)) ||
!(msg->msg_flags & MSG_EOR))
Patches currently in stable-queue which might be from [email protected]
are
queue-3.3/phonet-check-input-from-user-before-allocating.patch
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