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_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 F15BFC43387 for ; Thu, 3 Jan 2019 10:43:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BE3922073D for ; Thu, 3 Jan 2019 10:43:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731024AbfACKnE (ORCPT ); Thu, 3 Jan 2019 05:43:04 -0500 Received: from mail-it1-f198.google.com ([209.85.166.198]:55426 "EHLO mail-it1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730901AbfACKnE (ORCPT ); Thu, 3 Jan 2019 05:43:04 -0500 Received: by mail-it1-f198.google.com with SMTP id j3so35346531itf.5 for ; Thu, 03 Jan 2019 02:43:03 -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:message-id:subject:from:to; bh=7yrqO4D1wPf9BJpeM98hwAgpJKYqFIO765mE7gH3i+M=; b=qqUbmHN/VD+G1OQrZM96d7jMl1aRR3qrDerczTteeaMEWLWSvMpdr9MA8REJ32vPmI banxIA8iLhRZ9bkgkGYe4RUupXcBl8+bu52DXl31BOgk5irORmHZB8KIfAdezjst34I2 +vcBmA0ZY4ucP4WPCtm3vSz6w4oXW0QMyqWNX0c3d6ZhgkzwUNAc6jp9OEg58akaggcN YwdtHshUxkaVWpDjfgshejisA+4KpBnQxadoGos+yBMDkwfa42NB4Udn+VGnAQZ88w2I ZvKUPsIcyBpffrJaOWoAr79JGqXxnI3MHEbVUnnqILIgKxGLVi+qZO7nqjhzC2EwALyP gHqw== X-Gm-Message-State: AJcUukchRS8bF0p02kUmhSt3+Dc1DngRdMrfw061xhSMztZDhfeLsDWN /c11JKNCepaRSXlXgwTDSdtGx2M5nb1nnXphQx1Igd/jFu93 X-Google-Smtp-Source: ALg8bN5fAiiDcVvACvB5hbBCJt6ighwGS+VLpvSdzK9mCS1qm1VihN/t4i0QnvTS0zh3B0xjlta+HPonGTVM3velAiWo4hJJJtnx MIME-Version: 1.0 X-Received: by 2002:a24:5f93:: with SMTP id r141mr34803205itb.4.1546512183116; Thu, 03 Jan 2019 02:43:03 -0800 (PST) Date: Thu, 03 Jan 2019 02:43:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000050ccc2057e8b6df4@google.com> Subject: KASAN: slab-out-of-bounds Read in __xfrm_policy_bysel_ctx 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: b71acb0e3721 Merge branch 'linus' of git://git.kernel.org/.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=15e83920c00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4a8e05cab2dc66d3 dashboard link: https://syzkaller.appspot.com/bug?extid=f8bca486925bdceb2632 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+f8bca486925bdceb2632@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in __xfrm_policy_bysel_ctx.constprop.0+0x3e5/0x470 net/xfrm/xfrm_policy.c:1618 Read of size 1 at addr ffff8880a7a49459 by task syz-executor2/9675 CPU: 0 PID: 9675 Comm: syz-executor2 Not tainted 4.20.0+ #2 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 __xfrm_policy_bysel_ctx.constprop.0+0x3e5/0x470 net/xfrm/xfrm_policy.c:1618 xfrm_policy_bysel_ctx+0x944/0x1020 net/xfrm/xfrm_policy.c:1664 xfrm_get_policy+0x67b/0x1160 net/xfrm/xfrm_user.c:1887 xfrm_user_rcv_msg+0x458/0x8d0 net/xfrm/xfrm_user.c:2663 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2477 xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2671 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f80d9bebc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 000000002014f000 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f80d9bec6d4 R13: 00000000004c5223 R14: 00000000004d8ae8 R15: 00000000ffffffff Allocated by task 3861: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x700 mm/slab.c:3554 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 getname+0x1a/0x20 fs/namei.c:211 do_sys_open+0x3a5/0x740 fs/open.c:1057 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3861: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3760 putname+0xef/0x130 fs/namei.c:261 do_sys_open+0x3f4/0x740 fs/open.c:1072 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a7a48200 which belongs to the cache names_cache of size 4096 The buggy address is located 601 bytes to the right of 4096-byte region [ffff8880a7a48200, ffff8880a7a49200) The buggy address belongs to the page: page:ffffea00029e9200 count:1 mapcount:0 mapping:ffff88812c2bec40 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002a05208 ffffea00021b2f08 ffff88812c2bec40 raw: 0000000000000000 ffff8880a7a48200 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7a49300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a7a49380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8880a7a49400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a7a49480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a7a49500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This bug is generated by a bot. 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