diff mbox

[net] rds: limit the size allocated by rds_message_alloc()

Message ID 1362363491-24501-1-git-send-email-amwang@redhat.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Amerigo Wang March 4, 2013, 2:18 a.m. UTC 
From: Cong Wang <amwang@redhat.com>

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@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
Signed-off-by: Cong Wang <amwang@redhat.com>

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Comments

Venkat Venkatsubra March 4, 2013, 2:43 p.m. UTC | #1 
On 3/3/2013 8:18 PM, Cong Wang wrote:
> From: Cong Wang <amwang@redhat.com>
>
> 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."
>
> Reported-by: Dave Jones <davej@redhat.com>
> Cc: Dave Jones <davej@redhat.com>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
> Signed-off-by: Cong Wang <amwang@redhat.com>
>
Acked-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
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David Miller March 4, 2013, 7:14 p.m. UTC | #2 
From: Cong Wang <amwang@redhat.com>
Date: Mon,  4 Mar 2013 10:18:11 +0800

> From: Cong Wang <amwang@redhat.com>
> 
> 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."
 ...
> Reported-by: Dave Jones <davej@redhat.com>
> Cc: Dave Jones <davej@redhat.com>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
> Signed-off-by: Cong Wang <amwang@redhat.com>

Applied and queued up for -stable, thanks.
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diff mbox

Patch

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;