BUG: pagefault on kernel address 0xffffc90002559000 in non-whitelisted uaccess BUG: unable to handle kernel paging request at ffffc90002559000 PGD 1da95a067 P4D 1da95a067 PUD 1da95b067 PMD 1bdd3d067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5666 Comm: syz-executor334 Not tainted 4.20.0-rc1+ #99 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:180 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 83 RSP: 0018:ffff8801b5f7f680 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000000000000ca80 RCX: 0000000000004a80 RDX: 000000000000ca80 RSI: ffffc90002559000 RDI: 00000000200080c0 RBP: ffff8801b5f7f6b8 R08: 0000000000000000 R09: 000000000000032a R10: fffff520004abb4f R11: ffffc9000255da7f R12: 000000002000cb40 R13: 00000000200000c0 R14: ffffc90002551000 R15: 00007ffffffff000 FS: 00000000017d2880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90002559000 CR3: 00000001b92cf000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: copy_to_user include/linux/uaccess.h:155 [inline] vidioc_g_fmt_vid_overlay+0x392/0x550 drivers/media/platform/vivid/vivid-vid-cap.c:1084 v4l_g_fmt+0x2ad/0x640 drivers/media/v4l2-core/v4l2-ioctl.c:1489 __video_do_ioctl+0x8b1/0x1050 drivers/media/v4l2-core/v4l2-ioctl.c:2853 video_usercopy+0x5c1/0x1760 drivers/media/v4l2-core/v4l2-ioctl.c:3035 video_ioctl2+0x2c/0x33 drivers/media/v4l2-core/v4l2-ioctl.c:3079 v4l2_ioctl+0x154/0x1b0 drivers/media/v4l2-core/v4l2-dev.c:364 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x443f49 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc8ee2f888 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443f49 RDX: 00000000200000c0 RSI: 00000000c0d05604 RDI: 0000000000000004 RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 R10: 00000000004002e0 R11: 0000000000000217 R12: 0000000000401c50 R13: 0000000000401ce0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: ffffc90002559000 ---[ end trace 8cf522765a92e8e0 ]--- RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:180 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 83 RSP: 0018:ffff8801b5f7f680 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000000000000ca80 RCX: 0000000000004a80 RDX: 000000000000ca80 RSI: ffffc90002559000 RDI: 00000000200080c0 RBP: ffff8801b5f7f6b8 R08: 0000000000000000 R09: 000000000000032a R10: fffff520004abb4f R11: ffffc9000255da7f R12: 000000002000cb40 R13: 00000000200000c0 R14: ffffc90002551000 R15: 00007ffffffff000 FS: 00000000017d2880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90002559000 CR3: 00000001b92cf000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400