[ 59/75] rds: limit the size allocated by rds_message_alloc()

Greg Kroah-Hartman
2013-03-18T21:07:28Z

From: Cong Wang <amwang@redhat.com>

[ Upstream commit ece6b0a2b25652d684a7ced4ae680a863af041e0 ]

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>
Acked-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/rds/message.c | 3 +++
1 file changed, 3 insertions(+)

--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -197,6 +197,9 @@ struct rds_message *rds_message_alloc(un
{
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;