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=-7.4 required=3.0 tests=BAYES_00,DATE_IN_PAST_03_06, FROM_LOCAL_HEX,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 4DB0AC433DF for ; Wed, 5 Aug 2020 17:10:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C626206F6 for ; Wed, 5 Aug 2020 17:10:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728545AbgHERJf (ORCPT ); Wed, 5 Aug 2020 13:09:35 -0400 Received: from mail-pl1-f200.google.com ([209.85.214.200]:33982 "EHLO mail-pl1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728495AbgHERHK (ORCPT ); Wed, 5 Aug 2020 13:07:10 -0400 Received: by mail-pl1-f200.google.com with SMTP id 65so32928794plf.1 for ; Wed, 05 Aug 2020 10:07:10 -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=A1AQFUtZc3oUBC+ELHd0XSkjPz6GoWRGj0v6BMelR/0=; b=XcDyIO5O8JreBZId5ejSbrbD8ffOt8z2ZeSooiv0S5iIPXDc7fBbBbZEgoGGTam3K3 YdIZUPtxIirj0m1BujDBfy3iP9uPUIJMOYesVFp/TVsBFjajc+uDqqZFD3CX5IJnPYbV 7EQHfGEuI3r5m8GREJO5phT9bCT83YetKH2UlFoJaUrWLT+dXsRQzJstCnGdBjx5FP+T nIfqgnm7teRlkdhrURQqVBv3M0lsBtD0afk7+xbR5dK3VxBlsm49EBNgf7jQVwTSaWxt XaGQVHnPdnH2SRaV+33r26fIKVMFHbPFAWfE/0XThfXncshfxBVySLhupYTiEvzDC/bv mthw== X-Gm-Message-State: AOAM530x3uIjtQLWmS2YTc04tCjWOQMMgq/VF8LCpF47O3CN0VpPfrF+ KFBChs5+QYg20rzb6CcYwyArflRN4zqW+s3RmwvOyp9qtDj/ X-Google-Smtp-Source: ABdhPJykkigbEi+M0gISZNJMdIPXT3ju2NiFa2v2XCWKQqEk8ic4jWaTpxRf/FDS3gSAkV6njowu7TVDsJBm9V9nFFyGPEY0qALC MIME-Version: 1.0 X-Received: by 2002:a6b:b4d1:: with SMTP id d200mr3127653iof.70.1596629836200; Wed, 05 Aug 2020 05:17:16 -0700 (PDT) Date: Wed, 05 Aug 2020 05:17:16 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000039829c05ac205a4c@google.com> Subject: KMSAN: uninit-value in do_xdp_generic From: syzbot To: andriin@fb.com, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, glider@google.com, hawk@kernel.org, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.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 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=16fa5198900000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa4f3b91169c2501 dashboard link: https://syzkaller.appspot.com/bug?extid=007ef8d907f2fb6e17ca 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+007ef8d907f2fb6e17ca@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in netif_receive_generic_xdp net/core/dev.c:4670 [inline] BUG: KMSAN: uninit-value in do_xdp_generic+0x1312/0x24f0 net/core/dev.c:4735 CPU: 1 PID: 11582 Comm: syz-executor.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+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 netif_receive_generic_xdp net/core/dev.c:4670 [inline] do_xdp_generic+0x1312/0x24f0 net/core/dev.c:4735 __netif_receive_skb_core+0x9a0/0x5890 net/core/dev.c:5107 __netif_receive_skb_one_core net/core/dev.c:5279 [inline] __netif_receive_skb net/core/dev.c:5395 [inline] netif_receive_skb_internal net/core/dev.c:5497 [inline] netif_receive_skb+0x56c/0xff0 net/core/dev.c:5556 tun_rx_batched include/linux/skbuff.h:4327 [inline] tun_get_user+0x6df8/0x72f0 drivers/net/tun.c:1972 tun_chr_write_iter+0x1f2/0x360 drivers/net/tun.c:2001 call_write_iter include/linux/fs.h:1908 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xd98/0x1480 fs/read_write.c:578 ksys_write+0x267/0x450 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:640 __ia32_sys_write+0x4a/0x70 fs/read_write.c:640 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2aa/0x400 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 RIP: 0023:0xf7f1b549 Code: Bad RIP value. RSP: 002b:00000000f54910cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000240 RDX: 000000000000000c RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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] pskb_expand_head+0x20b/0x1b00 net/core/skbuff.c:1627 netif_receive_generic_xdp net/core/dev.c:4616 [inline] do_xdp_generic+0x58c/0x24f0 net/core/dev.c:4735 __netif_receive_skb_core+0x9a0/0x5890 net/core/dev.c:5107 __netif_receive_skb_one_core net/core/dev.c:5279 [inline] __netif_receive_skb net/core/dev.c:5395 [inline] netif_receive_skb_internal net/core/dev.c:5497 [inline] netif_receive_skb+0x56c/0xff0 net/core/dev.c:5556 tun_rx_batched include/linux/skbuff.h:4327 [inline] tun_get_user+0x6df8/0x72f0 drivers/net/tun.c:1972 tun_chr_write_iter+0x1f2/0x360 drivers/net/tun.c:2001 call_write_iter include/linux/fs.h:1908 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xd98/0x1480 fs/read_write.c:578 ksys_write+0x267/0x450 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:640 __ia32_sys_write+0x4a/0x70 fs/read_write.c:640 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2aa/0x400 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. 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.