Message-ID: <94eb2c0d010ad4a7f40560efd650@google.com>
Date:   Fri, 22 Dec 2017 07:55:01 -0800
From:   syzbot 
        <bot+80f661b525da04e7baaef60ee883f18be36f3942@...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_update (2)

Hello,

syzkaller hit the following crash on  
9035a8961b504d0997369509ab8c6b1f0a4ee33d
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.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


audit: type=1400 audit(1513919078.260:7): avc:  denied  { map } for   
pid=3152 comm="syzkaller717822" path="/root/syzkaller717822551" dev="sda1"  
ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023  
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: slab-out-of-bounds in sha3_update+0xdf/0x2e0  
crypto/sha3_generic.c:161
Write of size 192 at addr ffff8801cf0e3b3c by task syzkaller717822/3152

CPU: 0 PID: 3152 Comm: syzkaller717822 Not tainted 4.15.0-rc4+ #232
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
  memcpy+0x37/0x50 mm/kasan/kasan.c:303
  memcpy include/linux/string.h:344 [inline]
  sha3_update+0xdf/0x2e0 crypto/sha3_generic.c:161
  crypto_shash_update+0xda/0x240 crypto/shash.c:110
  hmac_update+0x7e/0xa0 crypto/hmac.c:122
  crypto_shash_update+0xda/0x240 crypto/shash.c:110
  kdf_ctr security/keys/dh.c:181 [inline]
  keyctl_dh_compute_kdf security/keys/dh.c:226 [inline]
  __keyctl_dh_compute+0x160f/0x1990 security/keys/dh.c:398
  keyctl_dh_compute+0xac/0xf3 security/keys/dh.c:434
  SYSC_keyctl security/keys/keyctl.c:1741 [inline]
  SyS_keyctl+0x72/0x2c0 security/keys/keyctl.c:1637
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43feb9
RSP: 002b:00007ffd3aef51a8 EFLAGS: 00000217 ORIG_RAX: 00000000000000fa
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043feb9
RDX: 0000000020c2cfff RSI: 00000000204c8ff4 RDI: 0000000000000017
RBP: 00000000006ca018 R08: 00000000208e6fd4 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000217 R12: 0000000000401820
R13: 00000000004018b0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3152:
  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:3708 [inline]
  __kmalloc+0x162/0x760 mm/slab.c:3717
  kmalloc include/linux/slab.h:504 [inline]
  kdf_alloc security/keys/dh.c:111 [inline]
  __keyctl_dh_compute+0x2b0/0x1990 security/keys/dh.c:288
  keyctl_dh_compute+0xac/0xf3 security/keys/dh.c:434
  SYSC_keyctl security/keys/keyctl.c:1741 [inline]
  SyS_keyctl+0x72/0x2c0 security/keys/keyctl.c:1637
  entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 1637:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
  __cache_free mm/slab.c:3488 [inline]
  kfree+0xd6/0x260 mm/slab.c:3803
  kernfs_fop_release+0x13f/0x180 fs/kernfs/file.c:783
  __fput+0x327/0x7e0 fs/file_table.c:210
  ____fput+0x15/0x20 fs/file_table.c:244
  task_work_run+0x199/0x270 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:191 [inline]
  exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
  prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
  syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
  entry_SYSCALL_64_fastpath+0x94/0x96

The buggy address belongs to the object at ffff8801cf0e3a40
  which belongs to the cache kmalloc-512 of size 512
The buggy address is located 252 bytes inside of
  512-byte region [ffff8801cf0e3a40, ffff8801cf0e3c40)
The buggy address belongs to the page:
page:000000001ae65fa7 count:1 mapcount:0 mapping:0000000077bf18b4  
index:0xffff8801cf0e3cc0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801cf0e3040 ffff8801cf0e3cc0 0000000100000005
raw: ffff8801db001738 ffffea00073c1c20 ffff8801db000940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801cf0e3a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  ffff8801cf0e3b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8801cf0e3b80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
                                               ^
  ffff8801cf0e3c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
  ffff8801cf0e3c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
==================================================================


---
This bug is generated by a dumb bot. It may contain errors.
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