netdev - KASAN: stack-out-of-bounds Read in xfrm_state

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Date:   Wed, 22 Nov 2017 08:05:00 -0800
From:   syzbot 
        <bot+68bf59b49142965d6454163d7341e617a90139dc@...kaller.appspotmail.com>
To:     davem@...emloft.net, herbert@...dor.apana.org.au,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        steffen.klassert@...unet.com, syzkaller-bugs@...glegroups.com
Subject: KASAN: stack-out-of-bounds Read in xfrm_state_find (3)

syzkaller has found reproducer for the following crash on  
0c86a6bd85ff0629cd2c5141027fc1c8bb6cde9c
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x30fc/0x3230  
net/xfrm/xfrm_state.c:1051
Read of size 4 at addr ffff8801ccaa7af8 by task syzkaller231684/3045

CPU: 0 PID: 3045 Comm: syzkaller231684 Not tainted 4.14.0+ #128
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:53
  print_address_description+0x73/0x250 mm/kasan/report.c:252
  kasan_report_error mm/kasan/report.c:351 [inline]
  kasan_report+0x25b/0x340 mm/kasan/report.c:409
  __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
  xfrm_state_find+0x30fc/0x3230 net/xfrm/xfrm_state.c:1051
  xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1388 [inline]
  xfrm_tmpl_resolve+0x2fb/0xbd0 net/xfrm/xfrm_policy.c:1432
  xfrm_resolve_and_create_bundle+0x11b/0x2600 net/xfrm/xfrm_policy.c:1821
  xfrm_lookup+0x1574/0x23f0 net/xfrm/xfrm_policy.c:2146
  xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2264
  ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2559
  raw_sendmsg+0xc4f/0x3920 net/ipv4/raw.c:633
  inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
  sock_sendmsg_nosec net/socket.c:632 [inline]
  sock_sendmsg+0xca/0x110 net/socket.c:642
  SYSC_sendto+0x358/0x5a0 net/socket.c:1749
  SyS_sendto+0x40/0x50 net/socket.c:1717
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43ff09
RSP: 002b:00007fffb0363278 EFLAGS: 00000217 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ff09
RDX: 0000000000000000 RSI: 0000000020098000 RDI: 0000000000000003
RBP: 0000000000000086 R08: 0000000020c24000 R09: 0000000000000010
R10: fffffffffffffffe R11: 0000000000000217 R12: 0000000000401870
R13: 0000000000401900 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea000732a9c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801ccaa7980: f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 00 00 f2
  ffff8801ccaa7a00: f2 f2 f2 f2 00 00 00 00 f2 f2 f2 f2 00 00 00 00
> ffff8801ccaa7a80: 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 f2
                                                                 ^
  ffff8801ccaa7b00: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 f2 f2 f2
  ffff8801ccaa7b80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 f1 f1
==================================================================


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