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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 6926CC433DF for ; Wed, 10 Jun 2020 05:57:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4325C20801 for ; Wed, 10 Jun 2020 05:57:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726289AbgFJF5P (ORCPT ); Wed, 10 Jun 2020 01:57:15 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:45175 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726108AbgFJF5O (ORCPT ); Wed, 10 Jun 2020 01:57:14 -0400 Received: by mail-il1-f200.google.com with SMTP id q24so767157ili.12 for ; Tue, 09 Jun 2020 22:57:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=yOgbcmbmkDjbAdsXtHmX68CQ4GSO0HPYQRr+QH3lVlA=; b=LWAixqjJoiTgpwngC0MKupddU65wLoo2m97qZjO1T/BZVgiW5Hb9MKAT9e/uH85mOv RIxF37v/jlrEBStEqWRkxIwAJCnHiFqEfqKzhV0VPb6xEIFApzwY3Q7vs4oFoWmiMbl1 /3N1Fc8++PEGoHE3rZ/w8DSz2xfTRv7fb+W6NiLfeNXmeOCC91YrNVo7v4mg9IEZPduo cGXoTMBlr1MeJxVVVbV5Vix80b85XWP93KlsJYDZ5R0L3dpSrPcV9IryDRFx1P5OSJ6n zu9KdreSE27W9xs+fPOlHOj6TXnZovTcomwyFw5Q/7bv0VHWwf6mi4YBOEdaCppHtthR EiWA== X-Gm-Message-State: AOAM532VloJA03uk19oLB/6okAHTEiFTA8XFedQZn8d8lEEgv+ubxFfr h5t1DE1wqBBEJFV1iYSOMmLz80x/p8e4v0POMIS5oUONYF9x X-Google-Smtp-Source: ABdhPJwM9DQcjI9A2nOZL/NLJkcyaBlzTyndTAn1jVtBa5B6ws3rmYes8+pC+/GO7tDN1EPO5Z21Pp5D4fu/qaj6xXG/i93EoOMd MIME-Version: 1.0 X-Received: by 2002:a05:6602:22d6:: with SMTP id e22mr1770839ioe.128.1591768632010; Tue, 09 Jun 2020 22:57:12 -0700 (PDT) Date: Tue, 09 Jun 2020 22:57:12 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e02b3505a7b48345@google.com> Subject: KASAN: use-after-free Read in tipc_named_reinit From: syzbot To: davem@davemloft.net, jmaloy@redhat.com, kuba@kernel.org, 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" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: cb8e59cc Merge git://git.kernel.org/pub/scm/linux/kernel/g.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=12eccfd2100000 kernel config: https://syzkaller.appspot.com/x/.config?x=a16ddbc78955e3a9 dashboard link: https://syzkaller.appspot.com/bug?extid=e9cc557752ab126c1b99 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e9cc557752ab126c1b99@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:252 [inline] BUG: KASAN: use-after-free in tipc_named_reinit+0x913/0x946 net/tipc/name_distr.c:344 Read of size 8 at addr ffff8880580d2000 by task kworker/1:1/27 CPU: 1 PID: 27 Comm: kworker/1:1 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events tipc_net_finalize_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 __read_once_size include/linux/compiler.h:252 [inline] tipc_named_reinit+0x913/0x946 net/tipc/name_distr.c:344 tipc_net_finalize net/tipc/net.c:138 [inline] tipc_net_finalize+0x1cf/0x310 net/tipc/net.c:131 tipc_net_finalize_work+0x55/0x80 net/tipc/net.c:150 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Allocated by task 22186: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] tipc_nametbl_init+0x1b5/0x490 net/tipc/name_table.c:852 tipc_init_net+0x381/0x5c0 net/tipc/core.c:79 ops_init+0xaf/0x420 net/core/net_namespace.c:151 setup_net+0x2de/0x860 net/core/net_namespace.c:341 copy_net_ns+0x293/0x590 net/core/net_namespace.c:482 create_new_namespaces+0x3fb/0xb30 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231 ksys_unshare+0x43d/0x8e0 kernel/fork.c:2984 __do_sys_unshare kernel/fork.c:3052 [inline] __se_sys_unshare kernel/fork.c:3050 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3050 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 191: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 tipc_exit_net+0x2c/0x270 net/tipc/core.c:113 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186 cleanup_net+0x511/0xa50 net/core/net_namespace.c:603 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 The buggy address belongs to the object at ffff8880580d0000 which belongs to the cache kmalloc-16k of size 16384 The buggy address is located 8192 bytes inside of 16384-byte region [ffff8880580d0000, ffff8880580d4000) The buggy address belongs to the page: page:ffffea0001603400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea0001603400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0001509008 ffff8880aa001c50 ffff8880aa002380 raw: 0000000000000000 ffff8880580d0000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880580d1f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880580d1f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880580d2000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880580d2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880580d2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.