On Tue, May 16, 2017 at 5:05 PM, Andrey Konovalov <andreyk...@google.com> wrote: > Hi, > > I've got the following error report while fuzzing the kernel with syzkaller. > > On commit 2ea659a9ef488125eb46da6eb571de5eae5c43f6 (4.12-rc1). > > A reproducer and .config are attached.
+syzkaller > > divide error: 0000 [#1] SMP KASAN > Modules linked in: > CPU: 1 PID: 4019 Comm: a.out Not tainted 4.12.0-rc1+ #363 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > task: ffff88006b97c200 task.stack: ffff880062098000 > RIP: 0010:hdlcdrv_ioctl+0x8a3/0x1a50 drivers/net/hamradio/hdlcdrv.c:579 > RSP: 0018:ffff88006209f898 EFLAGS: 00010246 > RAX: 000000007fffffff RBX: ffff88006209f8d0 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88006888abd0 > RBP: ffff88006209f9b8 R08: 1ffff1000c413e8a R09: 1ffff1000c413e6a > R10: ffff88006b97c200 R11: 0000000000000001 R12: 1ffff1000c413f16 > R13: ffff88006888a100 R14: 0000000000000000 R15: 00000000005b78f4 > FS: 00007fb533884700(0000) GS:ffff88006cb00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000002026b000 CR3: 0000000065576000 CR4: 00000000000006e0 > Call Trace: > dev_ifsioc+0x53f/0x9f0 net/core/dev_ioctl.c:338 > dev_ioctl+0xc3c/0x1160 net/core/dev_ioctl.c:555 > sock_ioctl+0x169/0x440 net/socket.c:944 > vfs_ioctl fs/ioctl.c:45 > do_vfs_ioctl+0x1bf/0x1660 fs/ioctl.c:685 > SYSC_ioctl fs/ioctl.c:700 > SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 > entry_SYSCALL_64_fastpath+0x1f/0xbe arch/x86/entry/entry_64.S:204 > RIP: 0033:0x7fb532f96b79 > RSP: 002b:00007fffac2839f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007fffac283b60 RCX: 00007fb532f96b79 > RDX: 00000000208f1fd8 RSI: 00000100000089f0 RDI: 0000000000000003 > RBP: 00000000004004e0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 > R13: 00007fffac283b60 R14: 0000000000000000 R15: 0000000000000000 > Code: 45 8b be 48 ff ff ff 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 > 08 3c 03 0f 8e 8b 0e 00 00 45 8b b5 d0 0a 00 00 b8 ff ff ff 7f 99 <41> > f7 fe 41 39 c7 0f 87 89 0c 00 00 e8 ac e5 7e fe 49 8d bd d8 > RIP: hdlcdrv_ioctl+0x8a3/0x1a50 RSP: ffff88006209f898 > ---[ end trace 204af21e5cc80963 ]--- > qemu: terminating on signal 15 from pid 141905
