Message-ID: <001a113fae28149757055f0bbe00@google.com>
Date:   Tue, 28 Nov 2017 06:22:01 -0800
From:   syzbot 
        <bot+fa2ed481fed0c7ace1571b88a89dfd49ffd89cb6@...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: general protection fault in crypto_chacha20_crypt

Hello,

syzkaller hit 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


kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 6285 Comm: syzkaller774851 Not tainted 4.14.0+ #128
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
task: ffff8801c63fa140 task.stack: ffff8801c52e8000
RIP: 0010:__le32_to_cpup include/uapi/linux/byteorder/little_endian.h:58  
[inline]
RIP: 0010:le32_to_cpuvp crypto/chacha20_generic.c:19 [inline]
RIP: 0010:crypto_chacha20_init crypto/chacha20_generic.c:58 [inline]
RIP: 0010:crypto_chacha20_crypt+0x537/0xbd0 crypto/chacha20_generic.c:91
RSP: 0018:ffff8801c52ef5b0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 00000000ef9ecba1 RCX: ffffffff82265bab
RDX: 0000000000000000 RSI: ffff8801c5554780 RDI: ffff8801c52ef64c
RBP: ffff8801c52ef7d0 R08: ffffed0038a8ee6c R09: ffff8801c5477340
R10: ffff8801c52ef7f0 R11: ffffed0038a8ee6b R12: 0000000000000000
R13: 0000000000000000 R14: 000000005c3d10a6 R15: dffffc0000000000
FS:  00007f7725fce700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020216000 CR3: 00000001c5566000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  chacha20_simd+0xe4/0x410 arch/x86/crypto/chacha20_glue.c:78
  crypto_skcipher_decrypt include/crypto/skcipher.h:463 [inline]
  _skcipher_recvmsg crypto/algif_skcipher.c:133 [inline]
  skcipher_recvmsg+0xb06/0xf30 crypto/algif_skcipher.c:164
  skcipher_recvmsg_nokey+0x60/0x80 crypto/algif_skcipher.c:283
  sock_recvmsg_nosec net/socket.c:805 [inline]
  sock_recvmsg+0xc9/0x110 net/socket.c:812
  ___sys_recvmsg+0x29b/0x630 net/socket.c:2207
  __sys_recvmsg+0xe2/0x210 net/socket.c:2252
  SYSC_recvmsg net/socket.c:2264 [inline]
  SyS_recvmsg+0x2d/0x50 net/socket.c:2259
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x447ae9
RSP: 002b:00007f7725fcdd08 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000447ae9
RDX: 0000000040010101 RSI: 000000002008dfc8 RDI: 0000000000000006
RBP: 0000000000000086 R08: 00007f7725fce700 R09: 00007f7725fce700
R10: 00007f7725fce700 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000007efd4f R14: 00007f7725fce9c0 R15: 0000000000000000
Code: 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d6 05 00 00 4c 89 ea  
48 b8 00 00 00 00 00 fc ff df 89 9d 7c fe ff ff 48 c1 ea 03 <0f> b6 14 02  
4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85
RIP: __le32_to_cpup include/uapi/linux/byteorder/little_endian.h:58  
[inline] RSP: ffff8801c52ef5b0
RIP: le32_to_cpuvp crypto/chacha20_generic.c:19 [inline] RSP:  
ffff8801c52ef5b0
RIP: crypto_chacha20_init crypto/chacha20_generic.c:58 [inline] RSP:  
ffff8801c52ef5b0
RIP: crypto_chacha20_crypt+0x537/0xbd0 crypto/chacha20_generic.c:91 RSP:  
ffff8801c52ef5b0
general protection fault: 0000 [#2] SMP KASAN
---[ end trace 1cc7676745ebac7c ]---


---
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View attachment "config.txt" of type "text/plain" (126116 bytes)

Download attachment "raw.log" of type "application/octet-stream" (14720 bytes)

View attachment "repro.txt" of type "text/plain" (1534 bytes)

Download attachment "repro.c" of type "application/octet-stream" (12397 bytes)

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