TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. ================================================================== BUG: KASAN: slab-out-of-bounds in fscache_set_key fs/fscache/cookie.c:120 [inline] BUG: KASAN: slab-out-of-bounds in fscache_alloc_cookie+0x745/0x800 fs/fscache/cookie.c:171 Read of size 4 at addr ffff8801d35aa714 by task syz-executor2/16447 CPU: 1 PID: 16447 Comm: syz-executor2 Not tainted 4.19.0-rc7-next-20181015+ #94 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 fscache_set_key fs/fscache/cookie.c:120 [inline] fscache_alloc_cookie+0x745/0x800 fs/fscache/cookie.c:171 __fscache_acquire_cookie+0x230/0xb60 fs/fscache/cookie.c:303 fscache_acquire_cookie include/linux/fscache.h:338 [inline] nfs_fscache_get_client_cookie+0x463/0x600 fs/nfs/fscache.c:85 nfs_alloc_client+0x4de/0x770 fs/nfs/client.c:188 nfs_get_client+0x8e8/0x14c0 fs/nfs/client.c:430 nfs_init_server+0x357/0xff0 fs/nfs/client.c:670 nfs_create_server+0x86/0x5f0 fs/nfs/client.c:954 nfs_try_mount+0x180/0xa80 fs/nfs/super.c:1885 nfs_fs_mount+0x185f/0x2f36 fs/nfs/super.c:2697 legacy_get_tree+0x131/0x460 fs/fs_context.c:718 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1795 do_new_mount fs/namespace.c:2648 [inline] do_mount+0x70c/0x1d90 fs/namespace.c:2974 ksys_mount+0x12d/0x140 fs/namespace.c:3190 __do_sys_mount fs/namespace.c:3204 [inline] __se_sys_mount fs/namespace.c:3201 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3201 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb8b39fdc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457569 RDX: 0000000020000180 RSI: 0000000020000140 RDI: 00000000200002c0 RBP: 000000000072bf00 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb8b39fe6d4 R13: 00000000004c289b R14: 00000000004d3c78 R15: 00000000ffffffff Allocated by task 16447: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3722 [inline] __kmalloc+0x15b/0x760 mm/slab.c:3731 kmalloc include/linux/slab.h:551 [inline] kzalloc include/linux/slab.h:741 [inline] fscache_set_key fs/fscache/cookie.c:101 [inline] fscache_alloc_cookie+0x68f/0x800 fs/fscache/cookie.c:171 __fscache_acquire_cookie+0x230/0xb60 fs/fscache/cookie.c:303 fscache_acquire_cookie include/linux/fscache.h:338 [inline] nfs_fscache_get_client_cookie+0x463/0x600 fs/nfs/fscache.c:85 nfs_alloc_client+0x4de/0x770 fs/nfs/client.c:188 nfs_get_client+0x8e8/0x14c0 fs/nfs/client.c:430 nfs_init_server+0x357/0xff0 fs/nfs/client.c:670 nfs_create_server+0x86/0x5f0 fs/nfs/client.c:954 nfs_try_mount+0x180/0xa80 fs/nfs/super.c:1885 nfs_fs_mount+0x185f/0x2f36 fs/nfs/super.c:2697 legacy_get_tree+0x131/0x460 fs/fs_context.c:718 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1795 do_new_mount fs/namespace.c:2648 [inline] do_mount+0x70c/0x1d90 fs/namespace.c:2974 ksys_mount+0x12d/0x140 fs/namespace.c:3190 __do_sys_mount fs/namespace.c:3204 [inline] __se_sys_mount fs/namespace.c:3201 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3201 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 apparmor_sk_free_security+0xdd/0x120 security/apparmor/lsm.c:891 security_sk_free+0x4a/0x80 security/security.c:1520 sk_prot_free net/core/sock.c:1501 [inline] __sk_destruct+0x713/0xa80 net/core/sock.c:1587 sk_destruct+0x78/0x90 net/core/sock.c:1595 __sk_free+0xcf/0x300 net/core/sock.c:1606 sk_free+0x42/0x50 net/core/sock.c:1617 deferred_put_nlk_sk+0x164/0x350 net/netlink/af_netlink.c:738 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2437 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline] rcu_process_callbacks+0x1006/0x1ac0 kernel/rcu/tree.c:2697 __do_softirq+0x308/0xb7e kernel/softirq.c:292 The buggy address belongs to the object at ffff8801d35aa700 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 20 bytes inside of 32-byte region [ffff8801d35aa700, ffff8801d35aa720) The buggy address belongs to the page: page:ffffea00074d6a80 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d35aafc1 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea00074d1388 ffffea0007274548 ffff8801da8001c0 raw: ffff8801d35aafc1 ffff8801d35aa000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d35aa600: 05 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc ffff8801d35aa680: 06 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc >ffff8801d35aa700: 00 00 06 fc fc fc fc fc 05 fc fc fc fc fc fc fc ^ ffff8801d35aa780: 06 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc ffff8801d35aa800: 06 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================