[ 3.5.y.z extended stable ] Patch "rds: limit the size allocated by rds_message_alloc()" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Wed Mar 20 10:44:00 UTC 2013
This is a note to let you know that I have just added a patch titled
rds: limit the size allocated by rds_message_alloc()
to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From d345a1a7f17692716ba63b1b948151a42d1fb40c Mon Sep 17 00:00:00 2001
From: Cong Wang <amwang at redhat.com>
Date: Sun, 3 Mar 2013 16:18:11 +0000
Subject: [PATCH] rds: limit the size allocated by rds_message_alloc()
commit ece6b0a2b25652d684a7ced4ae680a863af041e0 upstream.
Dave Jones reported the following bug:
"When fed mangled socket data, rds will trust what userspace gives it,
and tries to allocate enormous amounts of memory larger than what
kmalloc can satisfy."
WARNING: at mm/page_alloc.c:2393 __alloc_pages_nodemask+0xa0d/0xbe0()
Hardware name: GA-MA78GM-S2H
Modules linked in: vmw_vsock_vmci_transport vmw_vmci vsock fuse bnep dlci bridge 8021q garp stp mrp binfmt_misc l2tp_ppp l2tp_core rfcomm s
Pid: 24652, comm: trinity-child2 Not tainted 3.8.0+ #65
Call Trace:
[<ffffffff81044155>] warn_slowpath_common+0x75/0xa0
[<ffffffff8104419a>] warn_slowpath_null+0x1a/0x20
[<ffffffff811444ad>] __alloc_pages_nodemask+0xa0d/0xbe0
[<ffffffff8100a196>] ? native_sched_clock+0x26/0x90
[<ffffffff810b2128>] ? trace_hardirqs_off_caller+0x28/0xc0
[<ffffffff810b21cd>] ? trace_hardirqs_off+0xd/0x10
[<ffffffff811861f8>] alloc_pages_current+0xb8/0x180
[<ffffffff8113eaaa>] __get_free_pages+0x2a/0x80
[<ffffffff811934fe>] kmalloc_order_trace+0x3e/0x1a0
[<ffffffff81193955>] __kmalloc+0x2f5/0x3a0
[<ffffffff8104df0c>] ? local_bh_enable_ip+0x7c/0xf0
[<ffffffffa0401ab3>] rds_message_alloc+0x23/0xb0 [rds]
[<ffffffffa04043a1>] rds_sendmsg+0x2b1/0x990 [rds]
[<ffffffff810b21cd>] ? trace_hardirqs_off+0xd/0x10
[<ffffffff81564620>] sock_sendmsg+0xb0/0xe0
[<ffffffff810b2052>] ? get_lock_stats+0x22/0x70
[<ffffffff810b24be>] ? put_lock_stats.isra.23+0xe/0x40
[<ffffffff81567f30>] sys_sendto+0x130/0x180
[<ffffffff810b872d>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff816c547b>] ? _raw_spin_unlock_irq+0x3b/0x60
[<ffffffff816cd767>] ? sysret_check+0x1b/0x56
[<ffffffff810b8695>] ? trace_hardirqs_on_caller+0x115/0x1a0
[<ffffffff81341d8e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff816cd742>] system_call_fastpath+0x16/0x1b
---[ end trace eed6ae990d018c8b ]---
Reported-by: Dave Jones <davej at redhat.com>
Cc: Dave Jones <davej at redhat.com>
Cc: David S. Miller <davem at davemloft.net>
Cc: Venkat Venkatsubra <venkat.x.venkatsubra at oracle.com>
Signed-off-by: Cong Wang <amwang at redhat.com>
Acked-by: Venkat Venkatsubra <venkat.x.venkatsubra at oracle.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
net/rds/message.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/rds/message.c b/net/rds/message.c
index f0a4658..aff589c 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -197,6 +197,9 @@ struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp)
{
struct rds_message *rm;
+ if (extra_len > KMALLOC_MAX_SIZE - sizeof(struct rds_message))
+ return NULL;
+
rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp);
if (!rm)
goto out;
--
1.8.1.2
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