Messages in this thread | | | Date | Wed, 31 Jan 2018 12:02:05 -0800 | From | Eric Biggers <> | Subject | Re: BUG: unable to handle kernel paging request in devpts_mntget |
| |
On Fri, Nov 03, 2017 at 05:42:01AM -0700, syzbot wrote: > Hello, > > syzkaller hit the following crash on > 36ef71cae353f88fd6e095e2aaa3e5953af1685d > 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. > > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers > > > IP: devpts_mntget+0x135/0x280 fs/devpts/inode.c:173 > PGD 7fff4067 P4D 7fff4067 PUD 7fff3067 PMD 7fff2067 PTE 0 > Oops: 0000 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 0 PID: 4725 Comm: syz-executor2 Not tainted 4.14.0-rc5-next-20171018+ > #8 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > task: ffff88006ba222c0 task.stack: ffff880068f00000 > RIP: 0010:devpts_mntget+0x135/0x280 fs/devpts/inode.c:173 > RSP: 0018:ffff880068f07a50 EFLAGS: 00010a03 > RAX: dffffc0000000000 RBX: ffffffffffffffed RCX: ffffffff81ce4ac0 > RDX: 1ffffffffffffffe RSI: 0000000000000001 RDI: fffffffffffffff5 > RBP: ffff880068f07ae0 R08: 0000000000000001 R09: 1ffff1000d1e0f05 > R10: ffff880068f07760 R11: 0000000000000000 R12: 1ffff1000d1e0f4a > R13: ffff880068f07a70 R14: ffff88006bc44700 R15: ffff880068f07b20 > FS: 00007f907b47d700(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: fffffbfffffffffe CR3: 000000003e167000 CR4: 00000000000006f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > ptm_open_peer+0x11a/0x2f0 drivers/tty/pty.c:631 > tty_ioctl+0x50f/0x15f0 drivers/tty/tty_io.c:2621 > vfs_ioctl fs/ioctl.c:45 [inline] > do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:685 > SYSC_ioctl fs/ioctl.c:700 [inline] > SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 > entry_SYSCALL_64_fastpath+0x1f/0xbe > RIP: 0033:0x447c89 > RSP: 002b:00007f907b47cbd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f907b47d6cc RCX: 0000000000447c89 > RDX: 00000000202c2000 RSI: 2000000000005441 RDI: 0000000000000000 > RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff > R13: 0000000000008e08 R14: 00000000006ecea8 R15: 00007f907b47d700 > Code: c1 ea 03 80 3c 02 00 0f 85 56 01 00 00 48 8b 5d 90 e8 e0 73 a0 ff 48 > 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f > 85 24 01 00 00 4c 8b 7b 08 48 b8 00 00 00 00 00 > RIP: devpts_mntget+0x135/0x280 fs/devpts/inode.c:173 RSP: ffff880068f07a50 > CR2: fffffbfffffffffe > ---[ end trace 47949eeac6e2cd68 ]--- > 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@googlegroups.com. > Please credit me with: Reported-by: syzbot <syzkaller@googlegroups.com> > > syzbot will keep track of this bug report. > Once a fix for this bug is committed, please reply to this email with: > #syz fix: exact-commit-title
Fixed by commit c9cc8d01fb0411:
#syz fix: devpts: fix error handling in devpts_mntget()
- Eric
| |