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=-9.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 C43F4C433E3 for ; Sat, 25 Jul 2020 18:13:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A587C206D8 for ; Sat, 25 Jul 2020 18:13:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727912AbgGYSNW (ORCPT ); Sat, 25 Jul 2020 14:13:22 -0400 Received: from mail-il1-f199.google.com ([209.85.166.199]:50887 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726727AbgGYSNV (ORCPT ); Sat, 25 Jul 2020 14:13:21 -0400 Received: by mail-il1-f199.google.com with SMTP id l17so8125434ilj.17 for ; Sat, 25 Jul 2020 11:13:21 -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=k4uGA3t3jAuxCZnMZ0DJL7nSqCS04UUnj/rEYSLsADI=; b=OdPtezkL2id11ZVm4xfiz/5pjW+WQCNeAe3CDav29acKgjBkE9cRiAMYNprZ/caQse PLUnCGXnHKYqL18D2F2fX9A5MoKH8VCpYODQznL4muyxgBCB28VgpC1m7wwato/xhvXf k+Kz3h5V9q8JL439TD1TZGMkJ60b3vH9xAgf7ZYKnCQyJzzvWBjRPpUYx/iLnOiibUzK jVvbpZ/YKO77ctOBnwQTv4FTZkT6usCItiBwwJ8Bc59g8D5CP3uq9TCIN/BlPkEPaP4W xoKuckEgSU2HlQrjTBaRGBk9g5FkviWdUdxG9ZTxPjVD30pw9NwLgQVjnA/QgMw39kbD q5qQ== X-Gm-Message-State: AOAM530DzXg0g5IZ+MnM+8IiZ6NgnR/X0NSem+tdhG5caRsZQ5ti2/e7 JisN4BF4LlOVhTIgo2GaAbORSH0cBGIDoeJW/xPlbG8U6F76 X-Google-Smtp-Source: ABdhPJwFq3zb1nVCNBsL5B/4Tzo2Lq1Drlc2AqfSvQa3wAbu5xxbonENma0WEs6CVwZOEQXHVCs/uPAVE5Iv/G/mdZKUuNSUH9Gt MIME-Version: 1.0 X-Received: by 2002:a5d:9d58:: with SMTP id k24mr9469028iok.107.1595700800775; Sat, 25 Jul 2020 11:13:20 -0700 (PDT) Date: Sat, 25 Jul 2020 11:13:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000065efbf05ab480bff@google.com> Subject: KMSAN: uninit-value in strstr From: syzbot To: davem@davemloft.net, glider@google.com, 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: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 93f54a72 instrumented.h: fix KMSAN support git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=118c3454900000 kernel config: https://syzkaller.appspot.com/x/.config?x=c534a9fad6323722 dashboard link: https://syzkaller.appspot.com/bug?extid=a73d24a22eeeebe5f244 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a73d24a22eeeebe5f244@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in strlen lib/string.c:552 [inline] BUG: KMSAN: uninit-value in strstr+0xfe/0x2e0 lib/string.c:991 CPU: 0 PID: 11587 Comm: syz-executor.0 Not tainted 5.8.0-rc5-syzkaller #0 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+0x1df/0x240 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 strlen lib/string.c:552 [inline] strstr+0xfe/0x2e0 lib/string.c:991 tipc_nl_node_reset_link_stats+0x434/0xa90 net/tipc/node.c:2504 genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline] genl_family_rcv_msg net/netlink/genetlink.c:714 [inline] genl_rcv_msg+0x1592/0x1740 net/netlink/genetlink.c:731 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2469 genl_rcv+0x63/0x80 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x1370/0x1400 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x623/0x750 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2446 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2446 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1f9 Code: Bad RIP value. RSP: 002b:00007fb2b7c2ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002ad40 RCX: 000000000045c1f9 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 0000000000c9fb6f R14: 00007fb2b7c2f9c0 R15: 000000000078bf0c Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2839 [inline] __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4478 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline] netlink_sendmsg+0x7d3/0x14d0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x1370/0x1400 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x623/0x750 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2446 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2446 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ===================================================== --- This report is generated by a bot. 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