device syz1 entered promiscuous mode device syz1 left promiscuous mode usercopy: kernel memory overwrite attempt detected to 000000009068c08a (kmalloc-1024) (1024 bytes) netlink: 5 bytes leftover after parsing attributes in process `syz-executor6'. ------------[ 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: 1 PID: 21205 Comm: syz-executor1 Not tainted 4.15.0-rc4+ #164 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:ffff8801aca47920 EFLAGS: 00010286 RAX: 0000000000000062 RBX: ffffffff85329080 RCX: 0000000000000000 RDX: 0000000000000062 RSI: ffffc900042be000 RDI: ffffed0035948f18 RBP: ffff8801aca47a10 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000491d6055 R11: 0000000000000000 R12: ffffffff85329040 R13: ffff8801db214dd0 R14: 0000000000000400 R15: ffffea00076c8500 FS: 00007feb873b1700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006ee378 CR3: 000000013dad6004 CR4: 00000000001606e0 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] ___sys_sendmsg+0x59c/0x8b0 net/socket.c:1995 __sys_sendmmsg+0x1ee/0x620 net/socket.c:2108 SYSC_sendmmsg net/socket.c:2139 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2134 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452ac9 RSP: 002b:00007feb873b0c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9 RDX: 0000000000000001 RSI: 0000000020aa9000 RDI: 0000000000000014 RBP: 000000000000013a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000080 R11: 0000000000000212 R12: 00000000006eee10 R13: 00000000ffffffff R14: 00007feb873b16d4 R15: 0000000000000002 Code: 48 0f 44 da e8 d0 bf c1 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 40 91 32 85 49 89 c0 e8 b6 7b ab ff <0f> 0b 48 c7 c0 00 8f 32 85 eb 96 48 c7 c0 40 8f 32 85 eb 8d 48 RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801aca47920 RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801aca47920 ---[ end trace 700039a0de05a883 ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..