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SubjectWARNING: bad usercopy in hidraw_ioctl
From
Hello,

syzbot found the following crash on:

HEAD commit: eea39f24 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=128c664c600000
kernel config: https://syzkaller.appspot.com/x/.config?x=d0c62209eedfd54e
dashboard link: https://syzkaller.appspot.com/bug?extid=fc7106c3bcd1cb7b165c
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+fc7106c3bcd1cb7b165c@syzkaller.appspotmail.com

------------[ cut here ]------------
Bad or missing usercopy whitelist? Kernel memory exposure attempt detected
from SLUB object 'shmem_inode_cache' (offset 88, size 33)!
WARNING: CPU: 0 PID: 3101 at mm/usercopy.c:74 usercopy_warn+0xe8/0x110
mm/usercopy.c:74
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 3101 Comm: syz-executor.0 Not tainted 5.3.0-rc5+ #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xca/0x13e lib/dump_stack.c:113
panic+0x2a3/0x6da kernel/panic.c:219
__warn.cold+0x20/0x4a kernel/panic.c:576
report_bug+0x262/0x2a0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:usercopy_warn+0xe8/0x110 mm/usercopy.c:74
Code: e8 bd f8 d6 ff 49 89 e9 4c 89 e1 48 89 de 41 57 48 c7 c7 40 f5 cd 85
41 55 41 56 4c 8b 44 24 20 48 8b 54 24 18 e8 9d de ac ff <0f> 0b 48 83 c4
18 e9 45 ff ff ff 48 c7 c5 40 f3 cd 85 49 89 ee 49
RSP: 0018:ffff8881c5d07be8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff85cdf500 RCX: 0000000000000000
RDX: 0000000000008303 RSI: ffffffff81288cfd RDI: ffffed1038ba0f6f
RBP: ffffffff85cc2ca0 R08: ffff8881c79b0000 R09: ffffed103b645d58
R10: ffffed103b645d57 R11: ffff8881db22eabf R12: ffffffff86a6b0c8
R13: 0000000000000058 R14: ffffffff85cdf380 R15: 0000000000000021
check_heap_object mm/usercopy.c:234 [inline]
__check_object_size mm/usercopy.c:280 [inline]
__check_object_size+0x327/0x39a mm/usercopy.c:250
check_object_size include/linux/thread_info.h:119 [inline]
check_copy_size include/linux/thread_info.h:150 [inline]
copy_to_user include/linux/uaccess.h:151 [inline]
hidraw_ioctl+0x65f/0xae0 drivers/hid/hidraw.c:440
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f75e27c6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 00000000200000c0 RSI: 0000000080404804 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f75e27c76d4
R13: 00000000004c21c9 R14: 00000000004d5628 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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