On Wed, Aug 7, 2019 at 9:28 PM syzbot <syzbot+3de312463756f656b47d@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: e96407b4 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=151b2926600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e > dashboard link: https://syzkaller.appspot.com/bug?extid=3de312463756f656b47d > 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+3de312463756f656b47d@xxxxxxxxxxxxxxxxxxxxxxxxx > > usercopy: Kernel memory exposure attempt detected from wrapped address > (offset 0, size 0)! > ------------[ cut here ]------------ > kernel BUG at mm/usercopy.c:98! > invalid opcode: 0000 [#1] SMP KASAN > CPU: 1 PID: 2968 Comm: syz-executor.1 Not tainted 5.3.0-rc2+ #25 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:98 > Code: e8 c1 f7 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 e0 > f3 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 15 98 c1 ff <0f> 0b e8 95 f7 > d6 ff e8 80 9f fd ff 8b 54 24 04 49 89 d8 4c 89 e1 > RSP: 0018:ffff8881b0f37be8 EFLAGS: 00010282 > RAX: 000000000000005a RBX: ffffffff85cdf100 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff8128a0fd RDI: ffffed10361e6f6f > RBP: ffffffff85cdf2c0 R08: 000000000000005a R09: ffffed103b665d58 > R10: ffffed103b665d57 R11: ffff8881db32eabf R12: ffffffff85cdf460 > R13: ffffffff85cdf100 R14: 0000000000000000 R15: ffffffff85cdf100 > FS: 00007f539a2a9700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000021237d0 CR3: 00000001d6ac6000 CR4: 00000000001406e0 > Call Trace: > check_bogus_address mm/usercopy.c:151 [inline] > __check_object_size mm/usercopy.c:260 [inline] > __check_object_size.cold+0xb2/0xba 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+0x38c/0xae0 drivers/hid/hidraw.c:392 > 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:00007f539a2a8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829 > RDX: 0000000020000800 RSI: 0000000090044802 RDI: 0000000000000004 > RBP: 000000000075c268 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f539a2a96d4 > R13: 00000000004c21f3 R14: 00000000004d55b8 R15: 00000000ffffffff > Modules linked in: > ---[ end trace 24b9968555bf4653 ]--- > RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:98 > Code: e8 c1 f7 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 e0 > f3 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 15 98 c1 ff <0f> 0b e8 95 f7 > d6 ff e8 80 9f fd ff 8b 54 24 04 49 89 d8 4c 89 e1 > RSP: 0018:ffff8881b0f37be8 EFLAGS: 00010282 > RAX: 000000000000005a RBX: ffffffff85cdf100 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff8128a0fd RDI: ffffed10361e6f6f > RBP: ffffffff85cdf2c0 R08: 000000000000005a R09: ffffed103b665d58 > R10: ffffed103b665d57 R11: ffff8881db32eabf R12: ffffffff85cdf460 > R13: ffffffff85cdf100 R14: 0000000000000000 R15: ffffffff85cdf100 > FS: 00007f539a2a9700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000021237d0 CR3: 00000001d6ac6000 CR4: 00000000001406e0 > > > --- > 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. Looks like the same bug: #syz dup: KASAN: slab-out-of-bounds Read in hidraw_ioctl
