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=-8.7 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=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 7F350C43461 for ; Sat, 12 Sep 2020 07:59:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4925520796 for ; Sat, 12 Sep 2020 07:59:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725838AbgILH7X (ORCPT ); Sat, 12 Sep 2020 03:59:23 -0400 Received: from mail-io1-f80.google.com ([209.85.166.80]:46157 "EHLO mail-io1-f80.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725813AbgILH7V (ORCPT ); Sat, 12 Sep 2020 03:59:21 -0400 Received: by mail-io1-f80.google.com with SMTP id j8so105996iof.13 for ; Sat, 12 Sep 2020 00:59:20 -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=go9OmBFDLb2n53CiVIZT2Q/pl1bejLw6HkAlVDkgsBE=; b=L9fO7O5lxHfAJs44WGmRM3qN6/YJ/vqa38Q0WP3g4pahaoBSxnZhevlib5/hfT0aEl iVDFsqLBZGoNUCmaVGuU0lufuXY8tTHvCQKjDvJctNkGUbroeIubEjQ4OSFInmy+sqvX XD6g4Dk66kV+WxLcpaw+2BMEnC10j1ta7wuoKgExArSV3AmXniQaXEc1J1dMwDipPWWo JNOoTfXeLnnnhGjdRY07I6hq67KAslVdZFVMpTNZkrCkMQ+r6gK0wElsPERBlWfybnPH ChACmv83WXXf2QdiRNuykXkO1gb8Iyu6JHZIsX/4qw69Hf8cunYZzQ6oZ2nObjKUIUtd sJ5g== X-Gm-Message-State: AOAM531aji8yO+Sfn/PkpHQoY6lSH7u7TttmUfdBtpwau4glW6CEsF/S 1CEz0Huoda0N1InxZI7UdL18azajcXl6BSp8Z4I1sSu8woa4 X-Google-Smtp-Source: ABdhPJxwV1H3W0bPHW/nlO//YfrCJZcoP3tSXnp34cEVfY3njErOz56u9OumJ1xOcGiIuXLJ3BO3D8OVXrZjFYplsbuMCK9FRZE/ MIME-Version: 1.0 X-Received: by 2002:a5d:8612:: with SMTP id f18mr4583223iol.135.1599897560098; Sat, 12 Sep 2020 00:59:20 -0700 (PDT) Date: Sat, 12 Sep 2020 00:59:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000bf2d3605af192d03@google.com> Subject: KMSAN: uninit-value in netif_receive_generic_xdp From: syzbot To: akpm@linux-foundation.org, glider@google.com, linux-kernel@vger.kernel.org, mingo@kernel.org, paulmck@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de 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 issue on: HEAD commit: 3b3ea602 x86: add failure injection to get/put/clear_user git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=177d7335900000 kernel config: https://syzkaller.appspot.com/x/.config?x=3afe005fb99591f dashboard link: https://syzkaller.appspot.com/bug?extid=026212ad75beeadc9907 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) userspace arch: i386 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+026212ad75beeadc9907@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x15c9/0x2530 net/core/dev.c:4670 CPU: 1 PID: 16 Comm: ksoftirqd/1 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+0x21c/0x280 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 netif_receive_generic_xdp+0x15c9/0x2530 net/core/dev.c:4670 do_xdp_generic net/core/dev.c:4735 [inline] __netif_receive_skb_core+0x823/0x6520 net/core/dev.c:5107 __netif_receive_skb_one_core net/core/dev.c:5279 [inline] __netif_receive_skb+0x164/0x670 net/core/dev.c:5395 process_backlog+0x50d/0xba0 net/core/dev.c:6239 napi_poll+0x43b/0xfd0 net/core/dev.c:6684 net_rx_action+0x35c/0xd40 net/core/dev.c:6752 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:634 smpboot_thread_fn+0x5f5/0xa90 kernel/smpboot.c:165 kthread+0x551/0x590 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 pskb_expand_head+0x3fd/0x1e30 net/core/skbuff.c:1636 netif_receive_generic_xdp+0x629/0x2530 net/core/dev.c:4616 do_xdp_generic net/core/dev.c:4735 [inline] __netif_receive_skb_core+0x823/0x6520 net/core/dev.c:5107 __netif_receive_skb_one_core net/core/dev.c:5279 [inline] __netif_receive_skb+0x164/0x670 net/core/dev.c:5395 process_backlog+0x50d/0xba0 net/core/dev.c:6239 napi_poll+0x43b/0xfd0 net/core/dev.c:6684 net_rx_action+0x35c/0xd40 net/core/dev.c:6752 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293 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+0xeab/0x12e0 mm/slub.c:4478 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x35f/0xb30 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] alloc_skb_with_frags+0x1f2/0xc10 net/core/skbuff.c:5770 sock_alloc_send_pskb+0xc83/0xe50 net/core/sock.c:2356 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2373 j1939_sk_alloc_skb net/can/j1939/socket.c:843 [inline] j1939_sk_send_loop net/can/j1939/socket.c:1025 [inline] j1939_sk_sendmsg+0xe11/0x2950 net/can/j1939/socket.c:1160 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __compat_sys_sendmsg net/compat.c:466 [inline] __do_compat_sys_sendmsg net/compat.c:473 [inline] __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:470 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:470 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2af/0x480 arch/x86/entry/common.c:477 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c ===================================================== --- This report is generated by a bot. 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