netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle kernel paging request at ffffea0006b65100 PGD 21ffed067 P4D 21ffed067 PUD 21ffec067 PMD 800000021e0001e3 Oops: 0011 [#1] SMP KASAN CPU: 1 PID: 21246 Comm: syz-executor6 Not tainted 4.18.0-rc4-next-20180713+ #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0xffffea0006b65100 Code: ad de 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 fc ff 02 00 01 00 00 00 00 ad de 00 02 00 00 00 00 RSP: 0018:ffff8801960e6f08 EFLAGS: 00010246 RAX: ffffea0006b65100 RBX: dffffc0000000000 RCX: ffffc90002e44000 RDX: 1ffff1003b1bd1d6 RSI: ffff8801960e7188 RDI: ffff8801d8de8eb0 RBP: ffff8801960e70f8 R08: ffff880194666040 R09: ffff8801960e6b70 R10: ffffed003ae34cb0 R11: ffff8801d71a6587 R12: ffff8801960e7188 R13: ffff8801d8de8eb0 R14: ffff8801d8de8ed8 R15: ffffea0007230540 FS: 00007f49437ed700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffea0006b65100 CR3: 00000001c8668000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: shrink_slab_memcg mm/vmscan.c:598 [inline] shrink_slab+0x861/0xa60 mm/vmscan.c:671 shrink_node+0x429/0x16a0 mm/vmscan.c:2735 shrink_zones mm/vmscan.c:2964 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3324 memory_high_write+0x283/0x310 mm/memcontrol.c:5611 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3502 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x117/0x9d0 fs/read_write.c:485 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f49437ecc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f49437ed6d4 RCX: 0000000000455ab9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000017 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c2c77 R14: 00000000004d4c80 R15: 0000000000000000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) CR2: ffffea0006b65100 ---[ end trace 1e8d2dbfac40317b ]--- RIP: 0010:0xffffea0006b65100 Code: ad de 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 fc ff 02 00 01 00 00 00 00 ad de 00 02 00 00 00 00 RSP: 0018:ffff8801960e6f08 EFLAGS: 00010246 RAX: ffffea0006b65100 RBX: dffffc0000000000 RCX: ffffc90002e44000 RDX: 1ffff1003b1bd1d6 RSI: ffff8801960e7188 RDI: ffff8801d8de8eb0 RBP: ffff8801960e70f8 R08: ffff880194666040 R09: ffff8801960e6b70 R10: ffffed003ae34cb0 R11: ffff8801d71a6587 R12: ffff8801960e7188 R13: ffff8801d8de8eb0 R14: ffff8801d8de8ed8 R15: ffffea0007230540 FS: 00007f49437ed700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffea0006b65100 CR3: 00000001c8668000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400