random: sshd: uninitialized urandom read (32 bytes read) audit: type=1400 audit(1565386695.424:36): avc: denied { map } for pid=7035 comm="syz-executor139" path="/root/syz-executor139391520" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 ================================================================== BUG: KASAN: slab-out-of-bounds in bpf_skb_proto_xlat net/core/filter.c:2151 [inline] BUG: KASAN: slab-out-of-bounds in ____bpf_skb_change_proto net/core/filter.c:2189 [inline] BUG: KASAN: slab-out-of-bounds in bpf_skb_change_proto+0xdbc/0x10f0 net/core/filter.c:2164 Read of size 2 at addr ffff888091537d40 by task syz-executor139/7035 CPU: 0 PID: 7035 Comm: syz-executor139 Not tainted 4.14.138 #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428 bpf_skb_proto_xlat net/core/filter.c:2151 [inline] ____bpf_skb_change_proto net/core/filter.c:2189 [inline] bpf_skb_change_proto+0xdbc/0x10f0 net/core/filter.c:2164 bpf_prog_0a61b7f223ef83f3+0xdfd/0x1000 Allocated by task 0: (stack is not available) Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff888091537d40 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 0 bytes inside of 232-byte region [ffff888091537d40, ffff888091537e28) The buggy address belongs to the page: page:ffffea0002454dc0 count:1 mapcount:0 mapping:ffff8880915370c0 index:0x0 flags: 0x1fffc0000000100(slab) raw: 01fffc0000000100 ffff8880915370c0 0000000000000000 000000010000000c raw: ffffea0002361f60 ffff8880a9dcc248 ffff88821b719240 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888091537c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888091537c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888091537d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888091537d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888091537e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================