linux-kernel - general protection fault in string

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Date:   Sat, 02 Dec 2017 21:10:01 -0800
From:   syzbot 
        <bot+f7b85b77fd8042059586165494cd708475e87fc3@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: general protection fault in string

syzkaller has found reproducer for the following crash on  
2db767d9889cef087149a5eaa35c1497671fa40f
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


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: 3075 Comm: syzkaller531375 Not tainted 4.15.0-rc1+ #205
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
task: 00000000523f1e90 task.stack: 00000000c2d38485
RIP: 0010:string+0xb4/0x200 lib/vsprintf.c:595
RSP: 0018:ffff8801cc637868 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: fffffffffffffffe RCX: ffffffff85135fbf
RDX: 06c7240eabebe406 RSI: 1ffff100398c6f01 RDI: ffff8801cc637888
RBP: ffff8801cc6378b8 R08: ffffed00398a5566 R09: ffffed00398a5566
R10: 0000000000000002 R11: ffffed00398a5565 R12: 363920755f5f2034
R13: 363920755f5f2033 R14: ffffffffffffffff R15: ffff8801cc52ab2a
FS:  0000000001a75880(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000205e2ff0 CR3: 00000001cc470000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  vsnprintf+0x863/0x1900 lib/vsprintf.c:2282
  seq_vprintf+0xe3/0x1a0 fs/seq_file.c:397
  seq_printf+0xb3/0xe0 fs/seq_file.c:412
  show_timer+0x1ee/0x2b0 fs/proc/base.c:2274
  seq_read+0x385/0x13d0 fs/seq_file.c:234
  do_loop_readv_writev fs/read_write.c:673 [inline]
  do_iter_read+0x3db/0x5b0 fs/read_write.c:897
  vfs_readv+0x121/0x1c0 fs/read_write.c:959
  do_preadv+0x11b/0x1a0 fs/read_write.c:1043
  SYSC_preadv fs/read_write.c:1093 [inline]
  SyS_preadv+0x30/0x40 fs/read_write.c:1088
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x440149
RSP: 002b:00007fff96d72b08 EFLAGS: 00000213 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007fff96d72b10 RCX: 0000000000440149
RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000011 R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401a10
R13: 0000000000401aa0 R14: 0000000000000000 R15: 0000000000000000
Code: 01 00 00 e8 7f 98 5c fc 4d 85 f6 0f 84 10 01 00 00 e8 71 98 5c fc 4c  
89 ea 48 b8 00 00 00 00 00 fc ff df 4d 8d 65 01 48 c1 ea 03 <0f> b6 04 02  
4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 ec 00 00
RIP: string+0xb4/0x200 lib/vsprintf.c:595 RSP: ffff8801cc637868
---[ end trace 3570c98033660e3f ]---


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