From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E1FDC072A4 for ; Sat, 18 May 2019 07:28:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F09A62087E for ; Sat, 18 May 2019 07:28:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728337AbfERH2H (ORCPT ); Sat, 18 May 2019 03:28:07 -0400 Received: from mail-it1-f197.google.com ([209.85.166.197]:36388 "EHLO mail-it1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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X-Received: by 2002:a02:1384:: with SMTP id 126mr37351023jaz.72.1558164485542; Sat, 18 May 2019 00:28:05 -0700 (PDT) Date: Sat, 18 May 2019 00:28:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a99a470589247007@google.com> Subject: KASAN: slab-out-of-bounds Read in rhashtable_walk_enter From: syzbot To: davem@davemloft.net, jon.maloy@ericsson.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tipc-discussion@lists.sourceforge.net, ying.xue@windriver.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 510e2ced ipv6: fix src addr routing with the exception table git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=15345db2a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=82f0809e8f0a8c87 dashboard link: https://syzkaller.appspot.com/bug?extid=21ad49ad4c11cbfba8d7 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1648fdb2a00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16437cf8a00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+21ad49ad4c11cbfba8d7@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x3ba2/0x5490 kernel/locking/lockdep.c:3664 Read of size 8 at addr ffff88821640d0c0 by task syz-executor701/9065 CPU: 0 PID: 9065 Comm: syz-executor701 Not tainted 5.1.0+ #17 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __lock_acquire+0x3ba2/0x5490 kernel/locking/lockdep.c:3664 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4302 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rhashtable_walk_enter+0xf9/0x390 lib/rhashtable.c:669 __tipc_dump_start+0x1fa/0x3c0 net/tipc/socket.c:3414 tipc_dump_start+0x70/0x90 net/tipc/socket.c:3396 __netlink_dump_start+0x4fb/0x7e0 net/netlink/af_netlink.c:2351 netlink_dump_start include/linux/netlink.h:226 [inline] tipc_sock_diag_handler_dump+0x1d9/0x270 net/tipc/diag.c:91 __sock_diag_cmd net/core/sock_diag.c:232 [inline] sock_diag_rcv_msg+0x322/0x410 net/core/sock_diag.c:263 netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2486 sock_diag_rcv+0x2b/0x40 net/core/sock_diag.c:274 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1926 sock_sendmsg_nosec net/socket.c:660 [inline] sock_sendmsg+0x12e/0x170 net/socket.c:671 ___sys_sendmsg+0x81d/0x960 net/socket.c:2292 __sys_sendmsg+0x105/0x1d0 net/socket.c:2330 __do_sys_sendmsg net/socket.c:2339 [inline] __se_sys_sendmsg net/socket.c:2337 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2337 do_syscall_64+0x103/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4401f9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffce5915488 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401f9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a80 R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 1: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3356 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3518 kmem_cache_zalloc include/linux/slab.h:732 [inline] __kernfs_new_node+0xf0/0x6c0 fs/kernfs/dir.c:632 kernfs_new_node+0x96/0x120 fs/kernfs/dir.c:698 __kernfs_create_file+0x51/0x340 fs/kernfs/file.c:1002 sysfs_add_file_mode_ns+0x222/0x560 fs/sysfs/file.c:305 create_files fs/sysfs/group.c:63 [inline] internal_create_group+0x35b/0xc40 fs/sysfs/group.c:148 sysfs_create_group fs/sysfs/group.c:174 [inline] sysfs_create_groups fs/sysfs/group.c:201 [inline] sysfs_create_groups+0x9b/0x141 fs/sysfs/group.c:191 device_add_groups drivers/base/core.c:1288 [inline] device_add_attrs drivers/base/core.c:1436 [inline] device_add+0x80f/0x17a0 drivers/base/core.c:2080 netdev_register_kobject+0x183/0x3b0 net/core/net-sysfs.c:1750 register_netdevice+0x878/0xff0 net/core/dev.c:8743 register_netdev+0x30/0x50 net/core/dev.c:8861 vti6_init_net+0x518/0x820 net/ipv6/ip6_vti.c:1126 ops_init+0xb6/0x410 net/core/net_namespace.c:129 __register_pernet_operations net/core/net_namespace.c:1092 [inline] register_pernet_operations+0x382/0x7f0 net/core/net_namespace.c:1163 register_pernet_device+0x2a/0x80 net/core/net_namespace.c:1250 vti6_tunnel_init+0x19/0x176 net/ipv6/ip6_vti.c:1195 do_one_initcall+0x109/0x7ca init/main.c:914 do_initcall_level init/main.c:982 [inline] do_initcalls init/main.c:990 [inline] do_basic_setup init/main.c:1008 [inline] kernel_init_freeable+0x4da/0x5c9 init/main.c:1168 kernel_init+0x12/0x1c5 init/main.c:1086 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff88821640d000 which belongs to the cache kernfs_node_cache of size 160 The buggy address is located 32 bytes to the right of 160-byte region [ffff88821640d000, ffff88821640d0a0) The buggy address belongs to the page: page:ffffea0008590340 count:1 mapcount:0 mapping:ffff88821bc45500 index:0xffff88821640dfee flags: 0x6fffc0000000200(slab) raw: 06fffc0000000200 ffffea00085a7c48 ffffea0008590388 ffff88821bc45500 raw: ffff88821640dfee ffff88821640d000 0000000100000012 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88821640cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88821640d000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88821640d080: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 ^ ffff88821640d100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88821640d180: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches