linux-kernel - net/xfrm: stack-out-of-bounds in xfrm_state

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Date:   Thu, 20 Apr 2017 18:47:38 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: net/xfrm: stack-out-of-bounds in xfrm_state_find

Hi,

I've got the following error report while fuzzing the kernel with syzkaller.

On linux-next commit 4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (4.11-rc7).

A reproducer and .config are attached.

==================================================================
BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x2ce7/0x2f70 at
addr ffff88006654f790
Read of size 4 by task a.out/4065
page:ffffea00019953c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x100000000000000()
raw: 0100000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea00019953e0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected
CPU: 1 PID: 4065 Comm: a.out Not tainted 4.11.0-rc7+ #251
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16
 dump_stack+0x292/0x398 lib/dump_stack.c:52
 kasan_report_error mm/kasan/report.c:212
 kasan_report+0x4d8/0x510 mm/kasan/report.c:347
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:367
 xfrm_state_find+0x2ce7/0x2f70 net/xfrm/xfrm_state.c:897
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1470
 xfrm_tmpl_resolve+0x308/0xc90 net/xfrm/xfrm_policy.c:1514
 xfrm_resolve_and_create_bundle+0x16e/0x2590 net/xfrm/xfrm_policy.c:1889
 xfrm_lookup+0xd72/0x1170 net/xfrm/xfrm_policy.c:2253
 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2375
 ip_route_output_flow+0x7f/0xa0 net/ipv4/route.c:2483
 udp_sendmsg+0x1565/0x2cd0 net/ipv4/udp.c:1015
 udpv6_sendmsg+0x8af/0x3500 net/ipv6/udp.c:1083
 inet_sendmsg+0x164/0x5b0 net/ipv4/af_inet.c:762
 sock_sendmsg_nosec net/socket.c:633
 sock_sendmsg+0xca/0x110 net/socket.c:643
 SYSC_sendto+0x660/0x810 net/socket.c:1696
 SyS_sendto+0x40/0x50 net/socket.c:1664
 entry_SYSCALL_64_fastpath+0x1f/0xc2 arch/x86/entry/entry_64.S:204
RIP: 0033:0x7f3daefd0b79
RSP: 002b:00007ffdb39bb0b8 EFLAGS: 00000206 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007ffdb39bb210 RCX: 00007f3daefd0b79
RDX: 0000000000000000 RSI: 0000000020001000 RDI: 0000000000000003
RBP: 00000000004004a0 R08: 0000000020013ff0 R09: 0000000000000010
R10: 0000000020000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffdb39bb210 R14: 0000000000000000 R15: 0000000000000000
Memory state around the buggy address:
 ffff88006654f680: f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2
 ffff88006654f700: f2 f2 f2 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00
>ffff88006654f780: 00 00 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00
                         ^
 ffff88006654f800: f2 f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00
 ffff88006654f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Download attachment ".config" of type "application/octet-stream" (127239 bytes)

View attachment "xfrm_state_find-oob-poc.c" of type "text/x-csrc" (5710 bytes)