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=-3.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 847D9C433DB for ; Sun, 28 Mar 2021 18:49:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 48FF26193D for ; Sun, 28 Mar 2021 18:49:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231499AbhC1Sqj (ORCPT ); Sun, 28 Mar 2021 14:46:39 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:40509 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231489AbhC1SqR (ORCPT ); Sun, 28 Mar 2021 14:46:17 -0400 Received: by mail-il1-f200.google.com with SMTP id s10so10418625ilo.7 for ; Sun, 28 Mar 2021 11:46:16 -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=pt0NAS2OYaIKRaLA3YT9CDMyqSgP+XpAyCaYfthX11E=; b=PcsmvJcg14+Meu7C7cPsi4uPHSapicO77bL2Rqmntp7aic6GmQtPbs+4VoirMrM15R goeum3g/sGVrz+urkk1/Ke9eIMRhJ4dlSE9PImMdaICk36erN51XpmQyh8OcD7LdJ8Mv bZrq15jaYwlTucvs77H7EF7e7FcuzXLcXCrlwEoKyTZhbOBOfnHjAKFhzVLCQI2iUJ7a OEbDFha1fCLcjIUEk0/QEUTsn7j05rj13R9XKBhVmF4mtMNgBN6FtAQxzFt587CaCMkb zB1vYc/MTPK8LVeZ/1x4KhRhxsVJWRT4U+YZfzyQaYCwkXYIx2JfXnx6EAduMwvZbTj9 j5hw== X-Gm-Message-State: AOAM533wLegxCr5170dgMKYXjwGCsLeTJXI2h0uYsW85kkZhGyN22TdO goA1xAXB41aI/ytaycFIwYnfoHQWA6hYobrfkaaC1Mh1UgMj X-Google-Smtp-Source: ABdhPJwjlI1DMEks5zQ+8E8AA+QQbfTDh8qAAXkD9SPeWg/merKgtVEG9bkcm2v8bc3ynoc1VnvI8A2tPKT7aEg5eHpN9NrLBpHS MIME-Version: 1.0 X-Received: by 2002:a05:6e02:12a9:: with SMTP id f9mr12789312ilr.12.1616957176566; Sun, 28 Mar 2021 11:46:16 -0700 (PDT) Date: Sun, 28 Mar 2021 11:46:16 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000020595705be9d2e49@google.com> Subject: [syzbot] KASAN: slab-out-of-bounds Read in fib6_nh_get_excptn_bucket (3) From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, dsahern@kernel.org, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 7acac4b3 Merge tag 'linux-kselftest-kunit-fixes-5.12-rc5.1.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=102449f6d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=5adab0bdee099d7a dashboard link: https://syzkaller.appspot.com/bug?extid=f7687113afaeee05b412 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+f7687113afaeee05b412@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in fib6_nh_get_excptn_bucket+0x18b/0x1a0 net/ipv6/route.c:1622 Read of size 8 at addr ffff88801f5f22f8 by task syz-executor.1/20604 CPU: 0 PID: 20604 Comm: syz-executor.1 Not tainted 5.12.0-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:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 fib6_nh_get_excptn_bucket+0x18b/0x1a0 net/ipv6/route.c:1622 fib6_nh_flush_exceptions+0x34/0x2d0 net/ipv6/route.c:1750 fib6_nh_release+0x81/0x3c0 net/ipv6/route.c:3554 fib6_info_destroy_rcu+0x187/0x210 net/ipv6/ip6_fib.c:174 rcu_do_batch kernel/rcu/tree.c:2559 [inline] rcu_core+0x74a/0x12f0 kernel/rcu/tree.c:2794 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197 Code: f0 4d 89 03 e9 f2 fc ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 <65> 8b 05 89 01 8e 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b RSP: 0018:ffffc90008dc7948 EFLAGS: 00000216 RAX: 000000000000b35d RBX: 0000000000000000 RCX: ffffc9000aea7000 RDX: 0000000000040000 RSI: ffffffff815c086f RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fab38a7 R10: ffffffff815c0865 R11: 0000000000000000 R12: ffffffff84b26d10 R13: 0000000000000200 R14: dffffc0000000000 R15: ffffc90008dc79a8 console_unlock+0x805/0xc80 kernel/printk/printk.c:2586 vprintk_emit+0x1ca/0x560 kernel/printk/printk.c:2098 vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:401 printk+0xba/0xed kernel/printk/printk.c:2146 jfs_mount.cold+0x95/0x136 fs/jfs/jfs_mount.c:217 jfs_fill_super+0x5bd/0xc80 fs/jfs/super.c:561 mount_bdev+0x34d/0x410 fs/super.c:1367 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1497 do_new_mount fs/namespace.c:2903 [inline] path_mount+0x132a/0x1f90 fs/namespace.c:3233 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount fs/namespace.c:3431 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3431 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46797a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0603554fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046797a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f0603555000 RBP: 00007f0603555040 R08: 00007f0603555040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f0603555000 R15: 0000000020061000 Allocated by task 20613: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc include/linux/slab.h:554 [inline] kzalloc include/linux/slab.h:684 [inline] fib6_info_alloc+0xbe/0x1d0 net/ipv6/ip6_fib.c:154 ip6_route_info_create+0x33e/0x19d0 net/ipv6/route.c:3656 ip6_route_add+0x24/0x150 net/ipv6/route.c:3746 inet6_rtm_newroute+0x152/0x160 net/ipv6/route.c:5368 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:3039 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3114 fib6_info_release include/net/ip6_fib.h:337 [inline] fib6_info_release include/net/ip6_fib.h:334 [inline] ip6_route_info_create+0x125f/0x19d0 net/ipv6/route.c:3736 ip6_route_add+0x24/0x150 net/ipv6/route.c:3746 inet6_rtm_newroute+0x152/0x160 net/ipv6/route.c:5368 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 insert_work+0x48/0x370 kernel/workqueue.c:1331 __queue_work+0x5c1/0xf00 kernel/workqueue.c:1497 queue_work_on+0xee/0x110 kernel/workqueue.c:1524 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:433 kobject_uevent_env+0xf9f/0x1680 lib/kobject_uevent.c:617 loop_configure+0x10cb/0x13a0 drivers/block/loop.c:255 lo_ioctl+0x3f7/0x1620 drivers/block/loop.c:1681 blkdev_ioctl+0x2a1/0x6d0 block/ioctl.c:583 block_ioctl+0xf9/0x140 fs/block_dev.c:1667 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88801f5f2200 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 56 bytes to the right of 192-byte region [ffff88801f5f2200, ffff88801f5f22c0) The buggy address belongs to the page: page:ffffea00007d7c80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f5f2 flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea00004e9980 0000000500000005 ffff888010841a00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88801f5f2180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801f5f2200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88801f5f2280: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801f5f2300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801f5f2380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. 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