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_DIGITS, FROM_LOCAL_HEX,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 81943C282CE for ; Tue, 4 Jun 2019 05:01:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5DD6524AC7 for ; Tue, 4 Jun 2019 05:01:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726600AbfFDFAG (ORCPT ); Tue, 4 Jun 2019 01:00:06 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:56156 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726136AbfFDFAG (ORCPT ); Tue, 4 Jun 2019 01:00:06 -0400 Received: by mail-io1-f72.google.com with SMTP id f22so15570568ioh.22 for ; Mon, 03 Jun 2019 22:00:06 -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=m0H82qKPLGC08pNSWqS6+ZK1CGm7k8VrXyLDBQA714Y=; b=j+qedqlvK7U+h+BuOXj5fUNp+zMLG+zC/rDqiREJSW3y8BTy4B1LrPM2vB7JFzxJ+h /Bjn8ipUnzMU3IMGhg1ajMkWk19zqL95Ni712DepPbaTPYo2V7Rj6EDPVOtTlQINbImr t+I3mS4jNhSLfjN03mY+LX7YXEIvJfV7jG/dcsyWa3/ty2u+L457OPeEAttzJ6UdEpct PJORTCoJjpED+CeeYOFdcNB6LClgfnt5F6DtcHRtA1fxI4aHcsSOQf09/YBk/p0eQFSD k75yxx9eM2FBa3qiBqEW6aPMi+E2yd7F3p5Oe28/0VohIgNtM58BaaekVTk/uChLIugm 1KUQ== X-Gm-Message-State: APjAAAXbvsQB2NuGl/tnrMuelZLafeZNHvO37ZU/z9scoS/8CrXGO1UF 89O14aewQvtO2bbjZFqUm5HfIqutOI54AaGbctbJvIrwiH+y X-Google-Smtp-Source: APXvYqzVTdF+nUlZMoiTaz4uhlaL49pZ3SxefQ1UTW2tT6mB4oLBn7rj41EBT4xmvubc5sURYW/gA+eeGwXDEooOy/rAyb5iYBPX MIME-Version: 1.0 X-Received: by 2002:a05:6602:2285:: with SMTP id d5mr145802iod.196.1559624405610; Mon, 03 Jun 2019 22:00:05 -0700 (PDT) Date: Mon, 03 Jun 2019 22:00:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ae08b2058a785a4c@google.com> Subject: KASAN: slab-out-of-bounds Read in icmpv6_xrlim_allow From: syzbot To: davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org 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 Hello, syzbot found the following crash on: HEAD commit: 0462eaac Merge git://git.kernel.org/pub/scm/linux/kernel/g.. git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=12c82772a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7b54c66298f8420 dashboard link: https://syzkaller.appspot.com/bug?extid=14536436e78408172703 compiler: gcc (GCC) 9.0.0 20181231 (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+14536436e78408172703@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in icmpv6_xrlim_allow+0x409/0x440 net/ipv6/icmp.c:216 Read of size 8 at addr ffff8880973ed8bf by task swapper/1/0 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.2.0-rc2+ #12 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 icmpv6_xrlim_allow+0x409/0x440 net/ipv6/icmp.c:216 icmp6_send+0x1107/0x1e50 net/ipv6/icmp.c:540 icmpv6_send+0xec/0x230 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x2b/0x530 net/ipv6/route.c:2367 dst_link_failure include/net/dst.h:416 [inline] ndisc_error_report+0xce/0x1c0 net/ipv6/ndisc.c:712 neigh_invalidate+0x245/0x570 net/core/neighbour.c:1000 neigh_timer_handler+0xc33/0xf30 net/core/neighbour.c:1086 call_timer_fn+0x193/0x720 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x66f/0x1740 kernel/time/timer.c:1698 __do_softirq+0x25c/0x94c kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1068 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:199 Code: c0 00 74 b2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 85 ee 94 01 00 74 20 fb 66 0f 1f 44 00 00 01 00 00 00 e8 52 f5 2f fa 65 8b 05 f3 77 e4 78 85 c0 74 06 41 RSP: 0018:ffff8880a98e7c88 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1164e80 RBX: ffff8880a98d4340 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a98d4bbc RBP: ffff8880a98e7c90 R08: ffff8880a98d4340 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae935080 R13: ffff888096ef0640 R14: 0000000000000000 R15: 0000000000000001 finish_lock_switch kernel/sched/core.c:2568 [inline] finish_task_switch+0x146/0x730 kernel/sched/core.c:2668 context_switch kernel/sched/core.c:2821 [inline] __schedule+0x7d3/0x1560 kernel/sched/core.c:3445 schedule_idle+0x58/0x80 kernel/sched/core.c:3537 do_idle+0x192/0x560 kernel/sched/idle.c:287 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:354 start_secondary+0x34e/0x4c0 arch/x86/kernel/smpboot.c:265 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 Allocated by task 0: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3326 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3488 dst_alloc+0x10e/0x200 net/core/dst.c:93 ip6_dst_alloc+0x34/0xa0 net/ipv6/route.c:356 icmp6_dst_alloc+0x1a9/0x660 net/ipv6/route.c:2806 ndisc_send_skb+0xfc1/0x14a0 net/ipv6/ndisc.c:488 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x30f/0x680 net/ipv6/addrconf.c:3880 call_timer_fn+0x193/0x720 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x66f/0x1740 kernel/time/timer.c:1698 __do_softirq+0x25c/0x94c kernel/softirq.c:293 Freed by task 0: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3698 dst_destroy+0x29e/0x3c0 net/core/dst.c:129 dst_destroy_rcu+0x16/0x19 net/core/dst.c:142 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2092 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2310 [inline] rcu_core+0xba5/0x1500 kernel/rcu/tree.c:2291 __do_softirq+0x25c/0x94c kernel/softirq.c:293 The buggy address belongs to the object at ffff8880973ed780 which belongs to the cache ip6_dst_cache of size 224 The buggy address is located 95 bytes to the right of 224-byte region [ffff8880973ed780, ffff8880973ed860) The buggy address belongs to the page: page:ffffea00025cfb40 refcount:1 mapcount:0 mapping:ffff88809b0b8cc0 index:0xffff8880973ed000 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00017a6288 ffffea00022d3f88 ffff88809b0b8cc0 raw: ffff8880973ed000 ffff8880973ed000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880973ed780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880973ed800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc > ffff8880973ed880: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff8880973ed900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880973ed980: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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.