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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 F412AECDFB8 for ; Wed, 18 Jul 2018 08:50:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AD3462075A for ; Wed, 18 Jul 2018 08:50:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AD3462075A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730923AbeGRJ0x (ORCPT ); Wed, 18 Jul 2018 05:26:53 -0400 Received: from mail-io0-f200.google.com ([209.85.223.200]:44868 "EHLO mail-io0-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730021AbeGRJ0x (ORCPT ); Wed, 18 Jul 2018 05:26:53 -0400 Received: by mail-io0-f200.google.com with SMTP id e8-v6so2859745ioq.11 for ; Wed, 18 Jul 2018 01:50:02 -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=uMv1oIM6Mdq/vGXgnaHZTqjLPtgJ5vlloO2+4zr2mVs=; b=HegQp41GWXrX/xxmPaZPocmTd4uqCjbW8J/0IEm3lKN7jniV6IZiRAvrhW3Gus6lqz AmFmvVua+kdPO28UUdawDvYwISR7z2XiMj6FK67c9JNXHRA+rEZKsp1nZAFVssPX4zqf BdSc92+zbbBOEbeA6athFzSbRkb9Y6E87ccySoA0cFtzWd9EOwg/pjs+ZJZVIP7CGWLq 3rv3uhltvr65NsvRC2BDN7NbQxBfQcewRY84BqDGXftcAPhJXM6SFNIxBqOU6C+VRWbq 1UNa8Z7eMGyVDe/oe9mzOcBEXxnuEDlmsQ6m2hTVofyTs4szvpC8mm57whKBnAw4sVD9 nNcA== X-Gm-Message-State: AOUpUlH85oNKQcfD1Egy7q1kJZm0+FdPB4LQVvzE/gLs70OAnI4I4Iqs LfBt/sIDBO/TBmM2iXdDWRwCxbpSnnuotj7VxfsV2R6MuJio X-Google-Smtp-Source: AAOMgpeaaOOZuN37330fZCPqCAQ52hGNtjd3Oi/l78BrHfu/FC3OsN709A0e3xlIgXwe/UklB5qBXJtGyhSkPM5tpSx5eBe7DHlp MIME-Version: 1.0 X-Received: by 2002:a02:98eb:: with SMTP id c40-v6mr2169586jak.32.1531903801909; Wed, 18 Jul 2018 01:50:01 -0700 (PDT) Date: Wed, 18 Jul 2018 01:50:01 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f16b5e05714225b8@google.com> Subject: KASAN: use-after-free Write in __xfrm_policy_unlink From: syzbot To: davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes 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: fcaccc829382 liquidio: correct error msg text when removin.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=13c6b368400000 kernel config: https://syzkaller.appspot.com/x/.config?x=89129667b46496c3 dashboard link: https://syzkaller.appspot.com/bug?extid=9d971dd21eb26567036b compiler: gcc (GCC) 8.0.1 20180413 (experimental) 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+9d971dd21eb26567036b@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:215 [inline] BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:679 [inline] BUG: KASAN: use-after-free in hlist_del_rcu include/linux/rculist.h:440 [inline] BUG: KASAN: use-after-free in __xfrm_policy_unlink+0x735/0x7e0 net/xfrm/xfrm_policy.c:1222 Write of size 8 at addr ffff8801a94744c8 by task swapper/0/0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.18.0-rc3+ #126 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:438 __write_once_size include/linux/compiler.h:215 [inline] __hlist_del include/linux/list.h:679 [inline] hlist_del_rcu include/linux/rculist.h:440 [inline] __xfrm_policy_unlink+0x735/0x7e0 net/xfrm/xfrm_policy.c:1222 xfrm_policy_delete+0x49/0x90 net/xfrm/xfrm_policy.c:1247 xfrm_policy_timer+0x453/0x670 net/xfrm/xfrm_policy.c:247 call_timer_fn+0x242/0x970 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7a6/0xc70 kernel/time/timer.c:1666 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x1d1/0x200 kernel/softirq.c:408 exiting_irq arch/x86/include/asm/apic.h:527 [inline] smp_apic_timer_interrupt+0x186/0x730 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 Code: c7 48 89 45 d8 e8 8a 2d 23 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 79 2d 23 fa eb 8a 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 RSP: 0018:ffffffff88e07bc0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffffffff11c0f7b RCX: ffffffff81667982 RDX: 1ffffffff11e3610 RSI: 0000000000000004 RDI: ffffffff88f1b080 RBP: ffffffff88e07bc0 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000000 R13: ffffffff88e07c78 R14: ffffffff899ee920 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc7/0x450 arch/x86/kernel/process.c:500 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x3aa/0x570 kernel/sched/idle.c:262 cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 rest_init+0xe1/0xe4 init/main.c:442 start_kernel+0x90e/0x949 init/main.c:738 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 Allocated by task 30004: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] xfrm_policy_alloc+0xd9/0x480 net/xfrm/xfrm_policy.c:260 xfrm_policy_construct+0x2f/0x590 net/xfrm/xfrm_user.c:1545 xfrm_add_policy+0x20f/0x750 net/xfrm/xfrm_user.c:1591 xfrm_user_rcv_msg+0x455/0x8b0 net/xfrm/xfrm_user.c:2590 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448 xfrm_netlink_rcv+0x6f/0x90 net/xfrm/xfrm_user.c:2598 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:651 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2125 __sys_sendmsg+0x11d/0x290 net/socket.c:2163 __do_sys_sendmsg net/socket.c:2172 [inline] __se_sys_sendmsg net/socket.c:2170 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2170 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 516: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 xfrm_policy_destroy_rcu+0x4a/0x60 net/xfrm/xfrm_policy.c:283 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2558 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2818 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2785 [inline] rcu_process_callbacks+0xed5/0x1850 kernel/rcu/tree.c:2802 __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 The buggy address belongs to the object at ffff8801a94744c0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 8 bytes inside of 1024-byte region [ffff8801a94744c0, ffff8801a94748c0) The buggy address belongs to the page: page:ffffea0006a51d00 count:1 mapcount:0 mapping:ffff8801da800ac0 index:0xffff8801a9475b40 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006ae8a08 ffffea00075d3c08 ffff8801da800ac0 raw: ffff8801a9475b40 ffff8801a9474040 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a9474380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801a9474400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8801a9474480: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801a9474500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801a9474580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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#bug-status-tracking for how to communicate with syzbot.