On Thu, Aug 22, 2019 at 12:38 AM syzbot <syzbot+fc7106c3bcd1cb7b165c@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > 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@xxxxxxxxxxxxxxxxxxxxxxxxx > > ------------[ 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. #syz dup: BUG: bad usercopy in hidraw_ioctl
