syzbot

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
usercopy: kernel memory exposure attempt detected from ffff8801c01ffff2 (mm_struct) (57692 bytes)
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:72!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 1967 Comm: syz-executor898 Not tainted 4.14.67+ #1
task: ffff8801c0088000 task.stack: ffff8801c02d0000
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x311/0x3a2 mm/usercopy.c:264
RSP: 0018:ffff8801c02d7b58 EFLAGS: 00010282
RAX: 0000000000000061 RBX: 000000000000e15c RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff9ca69c00 RDI: ffffffff9e5ce3a0
RBP: ffff8801c01ffff2 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff9cabfbe0
R13: 0000000000000001 R14: ffffffff9cabfba0 R15: ffffea0007007e00
FS:  0000000001d2a880(0000) GS:ffff8801dbb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055957da85470 CR3: 00000001c44de003 CR4: 00000000001606a0
Call Trace:
 check_object_size include/linux/thread_info.h:108 [inline]
 check_copy_size include/linux/thread_info.h:139 [inline]
 copy_to_user include/linux/uaccess.h:154 [inline]
 bpf_test_finish.isra.0+0xba/0x190 net/bpf/test_run.c:59
 bpf_prog_test_run_skb+0x4d0/0x8c0 net/bpf/test_run.c:144
 bpf_prog_test_run kernel/bpf/syscall.c:1330 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1602 [inline]
 SyS_bpf+0x79d/0x3640 kernel/bpf/syscall.c:1547
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x440259
RSP: 002b:00007fffaf77e3e8 EFLAGS: 00000213 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440259
RDX: 0000000000000028 RSI: 00000000200001c0 RDI: 000000000000000a
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401ae0
R13: 0000000000401b70 R14: 0000000000000000 R15: 0000000000000000
Code: fb ab 9c 4c 0f 45 e2 e8 be d6 db ff 48 8b 04 24 49 89 d9 48 89 e9 4c 89 f2 4c 89 e6 48 c7 c7 20 fc ab 9c 49 89 c0 e8 5a 1b cd ff <0f> 0b 4c 89 ff e8 55 cf fd ff e9 09 fe ff ff 4c 89 ff e8 48 cf 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801c02d7b58
RIP: __check_object_size+0x311/0x3a2 mm/usercopy.c:264 RSP: ffff8801c02d7b58
---[ end trace a8a7bbaf3c5ad891 ]---