usercopy: kernel memory overwrite attempt detected to 00000000066dc501 (kmalloc-1024) (968 bytes) ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:72! invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 20518 Comm: syz-executor4 Not tainted 4.15.0-rc5+ #171 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:report_usercopy mm/usercopy.c:64 [inline] RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: 0018:ffff8801a285f7c8 EFLAGS: 00010282 RAX: 0000000000000061 RBX: ffffffff8592bb60 RCX: 0000000000000000 RDX: 0000000000000061 RSI: ffffc9000218c000 RDI: ffffed003450beed RBP: ffff8801a285f8b8 R08: 1ffff1003450be7b R09: 0000000000000000 R10: 00000000fc1bf276 R11: 0000000000000000 R12: ffffffff8592bb20 R13: ffff8801d1a10050 R14: 00000000000003c8 R15: ffffea0007468400 FS: 00007fc5f094c700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000015dbcd8 CR3: 00000001ce89a001 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: check_object_size include/linux/thread_info.h:112 [inline] check_copy_size include/linux/thread_info.h:143 [inline] copy_from_user include/linux/uaccess.h:146 [inline] memdup_user+0x46/0x90 mm/util.c:168 do_ip_setsockopt.isra.12+0x1483/0x3160 net/ipv4/ip_sockglue.c:1090 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1248 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2388 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1821 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1800 entry_SYSCALL_64_fastpath+0x23/0x9a RIP: 0033:0x452ac9 RSP: 002b:00007fc5f094bc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bec8 RCX: 0000000000452ac9 RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000016 RBP: 000000000071bec8 R08: 00000000000003c8 R09: 0000000000000000 R10: 0000000020417c38 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a2f7ef R14: 00007fc5f094c9c0 R15: 0000000000000000 Code: 48 0f 44 da e8 70 5b c0 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 20 bc 92 85 49 89 c0 e8 e6 10 aa ff <0f> 0b 48 c7 c0 e0 b9 92 85 eb 96 48 c7 c0 20 ba 92 85 eb 8d 48 RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801a285f7c8 RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801a285f7c8 ---[ end trace 5d8ab010d30082b6 ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..