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=-5.7 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 0D22FC433DF for ; Fri, 26 Jun 2020 17:19:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2F84207D8 for ; Fri, 26 Jun 2020 17:19:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726682AbgFZRTW (ORCPT ); Fri, 26 Jun 2020 13:19:22 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:42562 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726349AbgFZRTS (ORCPT ); Fri, 26 Jun 2020 13:19:18 -0400 Received: by mail-io1-f71.google.com with SMTP id a16so6808777iow.9 for ; Fri, 26 Jun 2020 10:19:17 -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=W/UznvDYTIROrW7qKMCS6XF22x9cUlWvYZzA47Ub1po=; b=LGvSA1mBPCPNgMmKthgYgXM3F9QW7iipxcJILARVm1nUhvJ+vjrZWwidLjvOSGuZJ8 lgMItOZ4FKJn3IVO6oTbqlfhet8AfLKsuT6YGynPyhxQWS2R45KQSvjUNH+RYd5V4hLn 3vMvy9T0cAzJ6D3DMLeHauN5jFGrOVpayru33s+m9DJC3msbsfcVMyYzatNALV9UhrHk ldZNEdGYg+kJCaa9oqgl0++amJfJ4saaHFr5WMR5d8VQglF6BaQ71QaoMhN7WBOtL7Al fH95x8V4AkTyQUGrm34iFOZfoECcPqdgSgFptUzJCq2PJ+nOtGNepYcrByWCgIEGAoYA 284g== X-Gm-Message-State: AOAM531XuUJVNt8ZauuVDX9W3E4KF+fcuKPfcz2SNV8XYNvQSpqLMHoc Nhtof3UIqv+pOeEtNbakmyzwCoFBfWI8WG+9ENCyLhOusU75 X-Google-Smtp-Source: ABdhPJyzqPJJVJbnJdUZWyOP6bO5phOFd/OmicKa6rR8pI+4cKmScjjy4GybN2QztvqeT7miYQzbW058zl/i8YhDmF8HOFwneGwf MIME-Version: 1.0 X-Received: by 2002:a05:6602:2e81:: with SMTP id m1mr4460955iow.147.1593191957542; Fri, 26 Jun 2020 10:19:17 -0700 (PDT) Date: Fri, 26 Jun 2020 10:19:17 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b03d8405a8ffe81f@google.com> Subject: KMSAN: uninit-value in __nla_validate_parse From: syzbot To: davem@davemloft.net, glider@google.com, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.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: f0d5ec90 kmsan: apply __no_sanitize_memory to dotraplinkag.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1314b629100000 kernel config: https://syzkaller.appspot.com/x/.config?x=86e4f8af239686c6 dashboard link: https://syzkaller.appspot.com/bug?extid=6c73a580c3aec0f65123 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) 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+6c73a580c3aec0f65123@syzkaller.appspotmail.com netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. ===================================================== BUG: KMSAN: uninit-value in nla_ok include/net/netlink.h:1094 [inline] BUG: KMSAN: uninit-value in __nla_validate_parse+0x422/0x3450 lib/nlattr.c:369 CPU: 1 PID: 28976 Comm: syz-executor.2 Not tainted 5.7.0-rc4-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+0x1c9/0x220 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 nla_ok include/net/netlink.h:1094 [inline] __nla_validate_parse+0x422/0x3450 lib/nlattr.c:369 __nla_parse+0x137/0x150 lib/nlattr.c:478 nla_parse_nested include/net/netlink.h:1147 [inline] fl_set_erspan_opt+0x30e/0xd40 net/sched/cls_flower.c:1040 fl_set_enc_opt net/sched/cls_flower.c:1198 [inline] fl_set_key+0x6322/0x8e10 net/sched/cls_flower.c:1471 fl_set_parms net/sched/cls_flower.c:1707 [inline] fl_change+0x1202/0x7530 net/sched/cls_flower.c:1806 tc_new_tfilter+0x31a8/0x4f40 net/sched/cls_api.c:2168 rtnetlink_rcv_msg+0xcb7/0x1570 net/core/rtnetlink.c:5445 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2469 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5472 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+0x12b6/0x1350 net/socket.c:2362 ___sys_sendmsg net/socket.c:2416 [inline] __sys_sendmmsg+0x5fe/0xd60 net/socket.c:2506 __do_sys_sendmmsg net/socket.c:2535 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2532 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2532 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca59 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1dee04dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000004fd380 RCX: 000000000045ca59 RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000900 R14: 00000000004cbcfa R15: 00007f1dee04e6d4 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:2802 [inline] __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4436 __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+0x12b6/0x1350 net/socket.c:2362 ___sys_sendmsg net/socket.c:2416 [inline] __sys_sendmmsg+0x5fe/0xd60 net/socket.c:2506 __do_sys_sendmmsg net/socket.c:2535 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2532 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2532 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ===================================================== --- This bug is generated by a bot. 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