random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) audit: type=1400 audit(1571275205.604:36): avc: denied { map } for pid=6829 comm="syz-executor505" path="/root/syz-executor505359007" dev="sda1" ino=16482 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_change_head net/core/filter.c:2423 [inline] BUG: KASAN: slab-out-of-bounds in bpf_skb_change_head+0x4f3/0x600 net/core/filter.c:2419 Read of size 4 at addr ffff88809fb49040 by task syz-executor505/6829 CPU: 1 PID: 6829 Comm: syz-executor505 Not tainted 4.14.149 #0 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+0x138/0x197 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_load4_noabort+0x14/0x20 mm/kasan/report.c:429 ____bpf_skb_change_head net/core/filter.c:2423 [inline] bpf_skb_change_head+0x4f3/0x600 net/core/filter.c:2419 bpf_prog_adaf3e3433c58482+0xbf5/0x1000 Allocated by task 0: (stack is not available) Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff88809fb49080 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 64 bytes to the left of 232-byte region [ffff88809fb49080, ffff88809fb49168) The buggy address belongs to the page: page:ffffea00027ed240 count:1 mapcount:0 mapping:ffff88809fb49080 index:0x0 flags: 0x1fffc0000000100(slab) raw: 01fffc0000000100 ffff88809fb49080 0000000000000000 000000010000000c raw: ffffea0002551d20 ffffea0002618420 ffff8880a9e82d80 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809fb48f00: fb fc fc fb fb fb fb fb fc fc fb fb fb fb fb fc ffff88809fb48f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809fb49000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809fb49080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809fb49100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================