usercopy: Kernel memory exposure attempt detected from null address (offset 0, size 4)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:102! invalid opcode: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 3387 Comm: syz-executor.0 Not tainted 6.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:usercopy_abort+0x84/0x90 mm/usercopy.c:102 Code: 49 89 ce 48 c7 c3 ae 1d 86 83 48 0f 44 de 48 c7 c7 47 1d 86 83 4c 89 de 48 89 c1 41 52 41 56 53 e8 91 f4 87 01 48 83 c4 18 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000195fdf8 EFLAGS: 00010282 RAX: 0000000000000057 RBX: ffffffff83905a75 RCX: ce6c1669cd340e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffffffffffff R08: ffffffff8126c7f3 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000001 FS: 00007ffb248a26c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001480 CR3: 0000000109f0e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __check_object_size+0x442/0x6e0 check_object_size include/linux/thread_info.h:215 [inline] check_copy_size include/linux/thread_info.h:251 [inline] copy_to_user include/linux/uaccess.h:190 [inline] raw_getsockopt+0x2d0/0x390 net/can/raw.c:852 __sys_getsockopt+0x150/0x1b0 net/socket.c:2402 __do_sys_getsockopt net/socket.c:2412 [inline] __se_sys_getsockopt net/socket.c:2409 [inline] __x64_sys_getsockopt+0x23/0x30 net/socket.c:2409 do_syscall_64+0xe6/0x230 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7ffb24d20da9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffb248a20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007ffb24e4ef80 RCX: 00007ffb24d20da9 RDX: 0000000000000008 RSI: 0000000000000065 RDI: 0000000000000003 RBP: 00007ffb24d6d47a R08: 0000000020001480 R09: 0000000000000000 R10: 0000000020001440 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000006 R14: 00007ffb24e4ef80 R15: 00007ffd2b2249e8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:usercopy_abort+0x84/0x90 mm/usercopy.c:102 Code: 49 89 ce 48 c7 c3 ae 1d 86 83 48 0f 44 de 48 c7 c7 47 1d 86 83 4c 89 de 48 89 c1 41 52 41 56 53 e8 91 f4 87 01 48 83 c4 18 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000195fdf8 EFLAGS: 00010282 RAX: 0000000000000057 RBX: ffffffff83905a75 RCX: ce6c1669cd340e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffffffffffff R08: ffffffff8126c7f3 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000001 FS: 00007ffb248a26c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001480 CR3: 0000000109f0e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400