linux-kernel - general protection fault in asn1_ber

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Date:   Mon, 06 Nov 2017 10:36:00 -0800
From:   syzbot 
        <bot+04b92812698232d15d78c1e4d3bbf6fcc21eeeb1@...kaller.appspotmail.com>
To:     davem@...emloft.net, dhowells@...hat.com,
        herbert@...dor.apana.org.au, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: general protection fault in asn1_ber_decoder

Hello,

syzkaller hit the following crash on  
5a3517e009e979f21977d362212b7729c5165d92
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


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: 3 PID: 2984 Comm: syzkaller229187 Not tainted  
4.14.0-rc7-next-20171103+ #10
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88003ab66000 task.stack: ffff880039d58000
RIP: 0010:asn1_ber_decoder+0x41e/0x1af0 lib/asn1_decoder.c:233
RSP: 0018:ffff880039d5f8d0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88006981bf00 RDI: ffffffff853f1920
RBP: ffff880039d5fb88 R08: 0000000000000060 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff880039d5fb60 R15: dffffc0000000000
FS:  00000000010ac880(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020f49ffb CR3: 000000006aeb8000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  pkcs7_parse_message+0x2b3/0x730 crypto/asymmetric_keys/pkcs7_parser.c:139
  verify_pkcs7_signature+0x8d/0x290 certs/system_keyring.c:216
  pkcs7_preparse+0x7b/0xc0 crypto/asymmetric_keys/pkcs7_key_type.c:63
  key_create_or_update+0x533/0x1040 security/keys/key.c:855
  SYSC_add_key security/keys/keyctl.c:122 [inline]
  SyS_add_key+0x18a/0x340 security/keys/keyctl.c:62
  entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x434f39
RSP: 002b:00007fff51fda138 EFLAGS: 00000286 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 0000000000434f39
RDX: 0000000020000000 RSI: 0000000020f49ffb RDI: 0000000020f4a000
RBP: 0000000000000086 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000000
R13: 00000000004018b0 R14: 0000000000401940 R15: 0000000000000000
Code: 19 ff 48 8d 43 01 49 89 86 80 fe ff ff 48 89 85 a8 fd ff ff 48 8b 85  
c0 fd ff ff 48 01 d8 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <42> 0f b6 14  
3a 38 ca 7f 08 84 d2 0f 85 cd 0f 00 00 0f b6 00 88
RIP: asn1_ber_decoder+0x41e/0x1af0 lib/asn1_decoder.c:233 RSP:  
ffff880039d5f8d0
---[ end trace 616a5d4717bf683a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.
Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>

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View attachment "config.txt" of type "text/plain" (124357 bytes)

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Download attachment "repro.c" of type "application/octet-stream" (1219 bytes)