Message-ID: <001a11440c809be89b055f0aeea5@google.com>
Date:   Tue, 28 Nov 2017 05:24:01 -0800
From:   syzbot 
        <bot+264771bd693024ccca21958c9ccaacfc20852fe8@...kaller.appspotmail.com>
To:     davem@...emloft.net, herbert@...dor.apana.org.au,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: KASAN: slab-out-of-bounds Write in sha3_final

Hello,

syzkaller hit the following crash on  
6fc478f80f6809cc4b1a4230f47a62d3b7378dc0
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-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: slab-out-of-bounds in memset include/linux/string.h:326 [inline]
BUG: KASAN: slab-out-of-bounds in sha3_final+0xeb/0x2e0  
crypto/sha3_generic.c:173
Write of size 4294967223 at addr ffff8801cc23a759 by task  
syzkaller163089/3049

CPU: 0 PID: 3049 Comm: syzkaller163089 Not tainted 4.14.0-next-20171124+ #51
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
  check_memory_region_inline mm/kasan/kasan.c:260 [inline]
  check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
  memset+0x23/0x40 mm/kasan/kasan.c:285
  memset include/linux/string.h:326 [inline]
  sha3_final+0xeb/0x2e0 crypto/sha3_generic.c:173
  crypto_shash_final+0xd3/0x1f0 crypto/shash.c:144
  hmac_final+0x16c/0x2b0 crypto/hmac.c:135
  crypto_shash_final+0xd3/0x1f0 crypto/shash.c:144
  hmac_final+0x16c/0x2b0 crypto/hmac.c:135
  crypto_shash_final+0xd3/0x1f0 crypto/shash.c:144
  shash_async_final+0x35/0x40 crypto/shash.c:241
  crypto_ahash_op+0xbc/0x140 crypto/ahash.c:354
  crypto_ahash_final+0x57/0x70 crypto/ahash.c:359
  hash_sendmsg+0x686/0x9c0 crypto/algif_hash.c:131
  sock_sendmsg_nosec net/socket.c:632 [inline]
  sock_sendmsg+0xca/0x110 net/socket.c:642
  ___sys_sendmsg+0x322/0x8a0 net/socket.c:2048
  __sys_sendmmsg+0x1e6/0x5f0 net/socket.c:2138
  SYSC_sendmmsg net/socket.c:2169 [inline]
  SyS_sendmmsg+0x35/0x60 net/socket.c:2164
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4403f9
RSP: 002b:00007ffc5b02b7d8 EFLAGS: 00000207 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403f9
RDX: 0000000000000005 RSI: 00000000209fe000 RDI: 0000000000000004
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401d60
R13: 0000000000401df0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3049:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
  __do_kmalloc mm/slab.c:3712 [inline]
  __kmalloc+0x162/0x760 mm/slab.c:3721
  kmalloc include/linux/slab.h:519 [inline]
  sock_kmalloc+0x112/0x190 net/core/sock.c:1979
  hash_accept_parent_nokey+0x76/0x320 crypto/algif_hash.c:470
  hash_accept_parent+0x9a/0xd0 crypto/algif_hash.c:497
  af_alg_accept+0x125/0x670 crypto/af_alg.c:294
  alg_accept+0x46/0x60 crypto/af_alg.c:330
  SYSC_accept4+0x384/0x850 net/socket.c:1573
  SyS_accept4 net/socket.c:1523 [inline]
  SYSC_accept net/socket.c:1607 [inline]
  SyS_accept+0x26/0x30 net/socket.c:1604
  entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801cc23a240
  which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1305 bytes inside of
  2048-byte region [ffff8801cc23a240, ffff8801cc23aa40)
The buggy address belongs to the page:
page:ffffea0007308e80 count:1 mapcount:0 mapping:ffff8801cc23a240 index:0x0  
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801cc23a240 0000000000000000 0000000100000003
raw: ffffea000733a7a0 ffff8801db001950 ffff8801db000c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801cc23a680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  ffff8801cc23a700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8801cc23a780: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                                ^
  ffff8801cc23a800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
  ffff8801cc23a880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
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