==================================================================
BUG: KASAN: out-of-bounds in _copy_to_user+0x9a/0xc0 lib/usercopy.c:27
Read of size 793 at addr ffff8800003ffff5 by task syz-executor0/31257
CPU: 0 PID: 31257 Comm: syz-executor0 Not tainted 4.14.81+ #6
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x11b lib/dump_stack.c:53
print_address_description+0x60/0x22b mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409
_copy_to_user+0x9a/0xc0 lib/usercopy.c:27
copy_to_user include/linux/uaccess.h:155 [inline]
bpf_test_finish.isra.0+0xc8/0x190 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:1343 [inline]
SYSC_bpf kernel/bpf/syscall.c:1615 [inline]
SyS_bpf+0x79d/0x3700 kernel/bpf/syscall.c:1560
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457569
RSP: 002b:00007f8a68084c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000028 RSI: 0000000020000040 RDI: 000000000000000a
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8a680856d4
R13: 00000000004bd952 R14: 00000000004ccbf0 R15: 00000000ffffffff
The buggy address belongs to the page:
page:ffffea000000ffc0 count:1 mapcount:0 mapping: (null) index:0x0
flags: 0x0()
raw: 0000000000000000 0000000000000000 0000000000000000 00000001ffffffff
raw: dead000000000100 dead000000000200 ffff8801d2119000 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff880000400200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff880000400280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff880000400300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
^
ffff880000400380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff880000400400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================