[syzbot] general protection fault in __device_attach

syzbot
2022-03-14T08:46:22Z

Hello,

syzbot found the following issue on:

HEAD commit: e7e19defa575 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13ea76f6700000
kernel config: https://syzkaller.appspot.com/x/.config?x=442f8ac61e60a75e
dashboard link: https://syzkaller.appspot.com/bug?extid=dd3c97de244683533381
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dd3c97de244683533381@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
CPU: 1 PID: 14569 Comm: syz-executor.4 Not tainted 5.17.0-rc7-syzkaller-00068-ge7e19defa575 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__device_attach+0xad/0x4a0 drivers/base/dd.c:949
Code: e8 03 42 80 3c 20 00 0f 85 a3 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 48 49 8d bc 24 08 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 6e 03 00 00 45 0f b6 b4 24 08 01 00
RSP: 0018:ffffc90010a87b98 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: 1ffff92002150f74 RCX: 0000000000000000
RDX: 0000000000000021 RSI: 0000000000000008 RDI: 0000000000000108
RBP: ffff88807829d030 R08: 0000000000000000 R09: ffffc90010a87ad7
R10: fffff52002150f5a R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000fffffff0 R15: ffff88807829d140
FS: 00007f7048b3e700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f704a2dd090 CR3: 0000000074ae3000 CR4: 0000000000350ee0
Call Trace:
<TASK>
proc_ioctl.part.0+0x48e/0x560 drivers/usb/core/devio.c:2340
proc_ioctl drivers/usb/core/devio.c:170 [inline]
proc_ioctl_compat drivers/usb/core/devio.c:2389 [inline]
usbdev_do_ioctl drivers/usb/core/devio.c:2705 [inline]
usbdev_ioctl+0xc01/0x36c0 drivers/usb/core/devio.c:2791
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f704a1c9049
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7048b3e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f704a2dbf60 RCX: 00007f704a1c9049
RDX: 0000000020000000 RSI: 00000000c00c5512 RDI: 0000000000000003
RBP: 00007f704a22308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc683ba24f R14: 00007f7048b3e300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__device_attach+0xad/0x4a0 drivers/base/dd.c:949
Code: e8 03 42 80 3c 20 00 0f 85 a3 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 48 49 8d bc 24 08 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 6e 03 00 00 45 0f b6 b4 24 08 01 00
RSP: 0018:ffffc90010a87b98 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: 1ffff92002150f74 RCX: 0000000000000000
RDX: 0000000000000021 RSI: 0000000000000008 RDI: 0000000000000108
RBP: ffff88807829d030 R08: 0000000000000000 R09: ffffc90010a87ad7
R10: fffff52002150f5a R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000fffffff0 R15: ffff88807829d140
FS: 00007f7048b3e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b074ee1b8 CR3: 0000000074ae3000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: e8 03 42 80 3c callq 0x3c804208
5: 20 00 and %al,(%rax)
7: 0f 85 a3 03 00 00 jne 0x3b0
d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
14: fc ff df
17: 4c 8b 65 48 mov 0x48(%rbp),%r12
1b: 49 8d bc 24 08 01 00 lea 0x108(%r12),%rdi
22: 00
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 74 06 je 0x38
32: 0f 8e 6e 03 00 00 jle 0x3a6
38: 45 rex.RB
39: 0f .byte 0xf
3a: b6 b4 mov $0xb4,%dh
3c: 24 08 and $0x8,%al
3e: 01 00 add %eax,(%rax)

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