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 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 7164EC5DF60 for ; Fri, 8 Nov 2019 16:15:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 45E792178F for ; Fri, 8 Nov 2019 16:15:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727550AbfKHQPS (ORCPT ); Fri, 8 Nov 2019 11:15:18 -0500 Received: from mail-io1-f70.google.com ([209.85.166.70]:48439 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727149AbfKHQPQ (ORCPT ); Fri, 8 Nov 2019 11:15:16 -0500 Received: by mail-io1-f70.google.com with SMTP id q84so5688331iod.15 for ; Fri, 08 Nov 2019 08:15:14 -0800 (PST) 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:in-reply-to:message-id:subject :from:to:cc; bh=EntwwLODpyY62XQRYlVLnbG2S7/f1rAzhT5hFJTJSbM=; b=Zkho5Xa04UZy93i94VlA4YdUezrkKPnRT4H8zMzbssairBxTALh9MCQazK2NAeL/5B rQPLVfIv67O94TREgwJstcNiC3Lv1hL9LD7vgDkHKc1QSvNANRNnAgzgmn0Yel3AVQtk 8IDcSQWOIdv+LQfkZcEEhtPmUOO/bZAs8ibDn02iFAYV2S+4rEREUtbZHMZ0HEMyuamQ aj5grPGdrYXIfhzeI9AMlX+xLvjSkdf0vtY7AY5rSJ42KhkUp+HzOE0fu102hjCv3/6c 3u/D8jqfbDAH63zadfBgIG7hozVBiIjkjlSMhpQhSxCsal1Pq9MQt79+7IGZRYX/g6OO odfQ== X-Gm-Message-State: APjAAAXDDaCyYgwHoY9mDfkPiWhfmmdbz5pMn2Pudd957xNaDV2RpEf1 o9VCAbRy9luq5ojFdULjBbuJv6g4ja5jmy58MYEAmcprUjiF X-Google-Smtp-Source: APXvYqxBtgpBDe6GetQ1LkAJ95G+0MLSgVJj1ZlffQlRsU/gy09LNV9oamAfIrswACaI1WBRzGA/KiG0AmyFOpKmSXnH4nhe0XDO MIME-Version: 1.0 X-Received: by 2002:a5d:8b0c:: with SMTP id k12mr10971583ion.115.1573229714011; Fri, 08 Nov 2019 08:15:14 -0800 (PST) Date: Fri, 08 Nov 2019 08:15:14 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000040fb360596d81689@google.com> Subject: Re: Re: KMSAN: uninit-value in kernel_sendmsg From: syzbot To: Dmitry Vyukov Cc: davem@davemloft.net, dhowells@redhat.com, dvyukov@google.com, glider@google.com, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.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 > On Fri, Nov 8, 2019 at 4:54 PM syzbot > wrote: >> Hello, >> syzbot found the following crash on: >> HEAD commit: 124037e0 kmsan: drop inlines, rename >> do_kmsan_task_create() >> git tree: https://github.com/google/kmsan.git master >> console output: https://syzkaller.appspot.com/x/log.txt?x=1648eb9d600000 >> kernel config: >> https://syzkaller.appspot.com/x/.config?x=f03c659d0830ab8d >> dashboard link: >> https://syzkaller.appspot.com/bug?extid=4b6f070bb7a8ea5420d4 >> compiler: clang version 9.0.0 (/home/glider/llvm/clang >> 80fee25776c2fb61e74c1ecb1a523375c2500b69) >> 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+4b6f070bb7a8ea5420d4@syzkaller.appspotmail.com > I think this is: > #syz dup: KMSAN: use-after-free in rxrpc_send_keepalive Can't dup bug to a bug in different reporting (upstream->moderation).Please dup syzbot bugs only onto syzbot bugs for the same kernel/reporting. > https://syzkaller.appspot.com/bug?id=428e72dc175d0f4b23a1fb9b7d3d16fad7ef2a4b >> ===================================================== >> BUG: KMSAN: uninit-value in rxrpc_send_keepalive+0x2fa/0x830 >> net/rxrpc/output.c:655 >> CPU: 0 PID: 3367 Comm: kworker/0:2 Not tainted 5.3.0-rc7+ #0 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> Google 01/01/2011 >> Workqueue: krxrpcd rxrpc_peer_keepalive_worker >> Call Trace: >> __dump_stack lib/dump_stack.c:77 [inline] >> dump_stack+0x191/0x1f0 lib/dump_stack.c:113 >> kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108 >> __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250 >> sock_sendmsg_nosec net/socket.c:637 [inline] >> sock_sendmsg net/socket.c:657 [inline] >> kernel_sendmsg+0x2c9/0x440 net/socket.c:677 >> rxrpc_send_keepalive+0x2fa/0x830 net/rxrpc/output.c:655 >> rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:369 [inline] >> rxrpc_peer_keepalive_worker+0xb82/0x1510 net/rxrpc/peer_event.c:430 >> process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269 >> worker_thread+0x111b/0x2460 kernel/workqueue.c:2415 >> kthread+0x4b5/0x4f0 kernel/kthread.c:256 >> ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 >> Uninit was created at: >> kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline] >> kmsan_internal_poison_shadow+0x53/0x100 mm/kmsan/kmsan.c:134 >> kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:103 >> slab_alloc_node mm/slub.c:2790 [inline] >> slab_alloc mm/slub.c:2799 [inline] >> kmem_cache_alloc_trace+0x8c5/0xd20 mm/slub.c:2816 >> kmalloc include/linux/slab.h:552 [inline] >> __hw_addr_create_ex net/core/dev_addr_lists.c:30 [inline] >> __hw_addr_add_ex net/core/dev_addr_lists.c:76 [inline] >> __hw_addr_add net/core/dev_addr_lists.c:84 [inline] >> dev_addr_init+0x152/0x700 net/core/dev_addr_lists.c:464 >> alloc_netdev_mqs+0x2a9/0x1650 net/core/dev.c:9150 >> rtnl_create_link+0x559/0x1190 net/core/rtnetlink.c:2931 >> __rtnl_newlink net/core/rtnetlink.c:3186 [inline] >> rtnl_newlink+0x2757/0x38d0 net/core/rtnetlink.c:3254 >> rtnetlink_rcv_msg+0x115a/0x1580 net/core/rtnetlink.c:5223 >> netlink_rcv_skb+0x431/0x620 net/netlink/af_netlink.c:2477 >> rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5241 >> netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] >> netlink_unicast+0xf6c/0x1050 net/netlink/af_netlink.c:1328 >> netlink_sendmsg+0x110f/0x1330 net/netlink/af_netlink.c:1917 >> sock_sendmsg_nosec net/socket.c:637 [inline] >> sock_sendmsg net/socket.c:657 [inline] >> ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 >> __sys_sendmsg net/socket.c:2356 [inline] >> __do_sys_sendmsg net/socket.c:2365 [inline] >> __se_sys_sendmsg+0x305/0x460 net/socket.c:2363 >> __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363 >> do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 >> entry_SYSCALL_64_after_hwframe+0x63/0xe7 >> ===================================================== >> --- >> 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. >> -- >> You received this message because you are subscribed to the Google >> Groups "syzkaller-bugs" group. >> To unsubscribe from this group and stop receiving emails from it, send >> an email to syzkaller-bugs+unsubscribe@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/syzkaller-bugs/000000000000e3a8e00596d7ca32%40google.com.