syzbot
general protection fault in loop_validate_file
Status:
public: reported syz repro on 2019/04/14 00:02
Reported-by: syzbot+99f7858b4f046076e1bd@syzkaller.appspotmail.com
First crash: 2929d, last: 2743d
Sample crash report:
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 6611 Comm: syz-executor3 Not tainted 4.4.145-g2241aa9 #78
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b56c6000 task.stack: ffff8800b7660000
RIP: 0010:[<ffffffff8251968d>] [<ffffffff8251968d>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667
RSP: 0018:ffff8800b7667b70 EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffff8800b56c6000
RDX: 0000000000000000 RSI: ffffffff8251965d RDI: 00000000000001b0
RBP: ffff8800b7667b88 R08: ffff8800b56c6928 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8800b56c6000 R12: 0000000000000000
R13: ffff8801d9c11140 R14: ffff8801d9c11140 R15: ffff8801d6a5dc58
FS: 00007f82c255a700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffea13ee004 CR3: 00000000b577e000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffff8801d6a5db00 ffff8800b58e9000 0000000000000004 ffff8800b7667c18
ffffffff8251fbed 0000000b0000004c 0000000100000006 0000000000000000
0000000300000001 ffff8801d6a5db18 0000000041b58ab3 ffffffff84208310
Call Trace:
[<ffffffff8251fbed>] loop_change_fd drivers/block/loop.c:713 [inline]
[<ffffffff8251fbed>] lo_ioctl+0x3ed/0x16c0 drivers/block/loop.c:1370
[<ffffffff81dbb628>] __blkdev_driver_ioctl block/ioctl.c:288 [inline]
[<ffffffff81dbb628>] blkdev_ioctl+0x7b8/0x19c0 block/ioctl.c:584
[<ffffffff815d637e>] block_ioctl+0xde/0x120 fs/block_dev.c:1625
[<ffffffff8155bfdf>] vfs_ioctl fs/ioctl.c:43 [inline]
[<ffffffff8155bfdf>] file_ioctl fs/ioctl.c:470 [inline]
[<ffffffff8155bfdf>] do_vfs_ioctl+0x63f/0xf40 fs/ioctl.c:605
[<ffffffff8155c96f>] SYSC_ioctl fs/ioctl.c:622 [inline]
[<ffffffff8155c96f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613
[<ffffffff838c84e5>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 f7 01 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b0 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 cc 01 00 00 4d 8b a4 24 b0 01 00 00 4c 89 e0
RIP [<ffffffff8251968d>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667
RSP <ffff8800b7667b70>
---[ end trace edb1b898ce394c4c ]---
Struck through repros no longer work on HEAD.