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=-13.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_PASS,USER_IN_DEF_DKIM_WL 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 E9127C04EB8 for ; Thu, 6 Dec 2018 10:36:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 975A820989 for ; Thu, 6 Dec 2018 10:36:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="QzPbT1HU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 975A820989 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.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 S1729452AbeLFKgY (ORCPT ); Thu, 6 Dec 2018 05:36:24 -0500 Received: from mail-vs1-f68.google.com ([209.85.217.68]:39891 "EHLO mail-vs1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728842AbeLFKgX (ORCPT ); Thu, 6 Dec 2018 05:36:23 -0500 Received: by mail-vs1-f68.google.com with SMTP id h78so13979552vsi.6 for ; Thu, 06 Dec 2018 02:36:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=/YVN9DysgTqQ8iTepFkgqBGgAfx/B8fWmKdpkXm5J5g=; b=QzPbT1HUgnGxjwx0oS4e7ehyqOJM/J245EgbXZvlvIWX1wLYkpSyWukssnM7dzPw+b YHuH39u2x6kYiw9/XPXbBfBD9sZHKT+Lfb4vOUYj2BmtCvOI2hBjp/FRHUANWAZZ9lMg WryAVjbjEb+v3RJMmspdJbcx7Fd2GdAelUzFgKfqCcF4kV/1BS2+JZ4uf9skguW/lfAN LAMYdivZuJtSmLnFxLVuEpWhvhvcaEHVnURODeIWbfIxwANSpWiIiGseiVXfWRu+a79r wRxtrbZxol7DuznivOS/XaLZooJKY92VpchzNC41p3m02NpnBB7t6uz8MUVsrta48cKi NF/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=/YVN9DysgTqQ8iTepFkgqBGgAfx/B8fWmKdpkXm5J5g=; b=cKHDTyKVio0s3gM1ZBSSw7GUR7jtFXAT+P+OB6wSmWJi45LWPqLhC1sHHsl39IBAK5 UxncOtF1hW608B3YC9y9tq6FuIYRX3zfvCFWsqSZLF1P7Y35fgoE+8TaTYvz/3g1N89j vI3MsyycsdyRXHPntmaJpEXor1ZNT8sDaq1zaJvfvlWj7uNEK7ua4Uvohtbp2hsikCxN vFv/ahJ6wrtoSZqT/F/kHSvdoZuRkd5tdxRY1jk9eOSbKAsynWSYBTYib7+DJQdKz+Uv f/kO07Vb8XchpO6ZY0ffFyW7FR4jsdLgELbuQxxO7QwcJEKof26jxevQ0h8Ns2GRVZAS fetA== X-Gm-Message-State: AA+aEWZ7lJxU3UXnLjwakw1Oti+lzqS7EOPiY0ofkFKsugF4IMdfW5DD 75T3rXzvUu1RXd7y5MHXebZsR82AN177JRm7xnr7kzsPbuCRag== X-Google-Smtp-Source: AFSGD/UW0Dbv6hJz0jmF+sQAn+EHNBxdbYxnSkW2oKZgRGr6oFkC7cZ1aooVVHltd/dBNmXjw/YVZIGZ7pmsGcU7kI4= X-Received: by 2002:a67:44dc:: with SMTP id y89mr12103637vsf.4.1544092581349; Thu, 06 Dec 2018 02:36:21 -0800 (PST) MIME-Version: 1.0 References: <000000000000311344057c4b6cc3@google.com> In-Reply-To: <000000000000311344057c4b6cc3@google.com> From: Alexander Potapenko Date: Thu, 6 Dec 2018 11:36:08 +0100 Message-ID: Subject: Re: KMSAN: kernel-infoleak in sctp_getsockopt To: syzbot+ad5d327e6936a2e284be@syzkaller.appspotmail.com Cc: David Miller , LKML , linux-sctp@vger.kernel.org, Marcelo Ricardo Leitner , Networking , nhorman@tuxdriver.com, syzkaller-bugs@googlegroups.com, Vladislav Yasevich Content-Type: multipart/mixed; boundary="000000000000d08802057c581192" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000d08802057c581192 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, Dec 5, 2018 at 8:31 PM syzbot wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: fffec98ae2a6 net: proper support for CONFIG_GENERIC_CSUM = o.. > git tree: https://github.com/google/kmsan.git/master > console output: https://syzkaller.appspot.com/x/log.txt?x=3D12e84a4740000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D56b48b46dafe4= 516 > dashboard link: https://syzkaller.appspot.com/bug?extid=3Dad5d327e6936a2e= 284be > compiler: clang version 8.0.0 (trunk 343298) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D103cd225400= 000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit= : > Reported-by: syzbot+ad5d327e6936a2e284be@syzkaller.appspotmail.com > > 8021q: adding VLAN 0 to HW filter on device team0 > 8021q: adding VLAN 0 to HW filter on device team0 > 8021q: adding VLAN 0 to HW filter on device team0 > 8021q: adding VLAN 0 to HW filter on device team0 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > BUG: KMSAN: kernel-infoleak in _copy_to_user+0x19a/0x230 lib/usercopy.c:3= 3 > CPU: 1 PID: 8164 Comm: syz-executor2 Not tainted 4.20.0-rc3+ #95 > 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+0x32d/0x480 lib/dump_stack.c:113 > kmsan_report+0x12c/0x290 mm/kmsan/kmsan.c:683 > kmsan_internal_check_memory+0x32a/0xa50 mm/kmsan/kmsan.c:743 > kmsan_copy_to_user+0x78/0xd0 mm/kmsan/kmsan_hooks.c:634 > _copy_to_user+0x19a/0x230 lib/usercopy.c:33 > copy_to_user include/linux/uaccess.h:183 [inline] > sctp_getsockopt_local_addrs net/sctp/socket.c:5998 [inline] > sctp_getsockopt+0x15248/0x186f0 net/sctp/socket.c:7477 > sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 > __sys_getsockopt+0x489/0x550 net/socket.c:1939 > __do_sys_getsockopt net/socket.c:1950 [inline] > __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 > __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 > do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 > entry_SYSCALL_64_after_hwframe+0x63/0xe7 > RIP: 0033:0x457569 > Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f= 7 > 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f4991886c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 > RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457569 > RDX: 000000000000006d RSI: 0000000000000084 RDI: 0000000000000003 > RBP: 000000000072bf00 R08: 0000000020000140 R09: 0000000000000000 > R10: 0000000020001100 R11: 0000000000000246 R12: 00007f49918876d4 > R13: 00000000004c7d88 R14: 00000000004ce348 R15: 00000000ffffffff > > Uninit was stored to memory at: > kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] > kmsan_save_stack mm/kmsan/kmsan.c:261 [inline] > kmsan_internal_chain_origin+0x13d/0x240 mm/kmsan/kmsan.c:469 > kmsan_memcpy_memmove_metadata+0x1a9/0xf70 mm/kmsan/kmsan.c:344 > kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:362 > __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:162 > sctp_copy_laddrs net/sctp/socket.c:5901 [inline] > sctp_getsockopt_local_addrs net/sctp/socket.c:5967 [inline] > sctp_getsockopt+0x14f41/0x186f0 net/sctp/socket.c:7477 > sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 > __sys_getsockopt+0x489/0x550 net/socket.c:1939 > __do_sys_getsockopt net/socket.c:1950 [inline] > __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 > __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 > do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 > entry_SYSCALL_64_after_hwframe+0x63/0xe7 > > Uninit was stored to memory at: > kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] > kmsan_save_stack mm/kmsan/kmsan.c:261 [inline] > kmsan_internal_chain_origin+0x13d/0x240 mm/kmsan/kmsan.c:469 > kmsan_memcpy_memmove_metadata+0x1a9/0xf70 mm/kmsan/kmsan.c:344 > kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:362 > __msan_memcpy+0x61/0x70 mm/kmsan/kmsan_instr.c:162 > sctp_copy_laddrs net/sctp/socket.c:5890 [inline] > sctp_getsockopt_local_addrs net/sctp/socket.c:5967 [inline] > sctp_getsockopt+0x14de8/0x186f0 net/sctp/socket.c:7477 > sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 > __sys_getsockopt+0x489/0x550 net/socket.c:1939 > __do_sys_getsockopt net/socket.c:1950 [inline] > __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 > __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 > do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 > entry_SYSCALL_64_after_hwframe+0x63/0xe7 > > Uninit was created at: > kmsan_save_stack_with_flags mm/kmsan/kmsan.c:246 [inline] > kmsan_internal_poison_shadow+0x6d/0x130 mm/kmsan/kmsan.c:170 > kmsan_kmalloc+0xa1/0x100 mm/kmsan/kmsan_hooks.c:186 > __kmalloc+0x14c/0x4d0 mm/slub.c:3825 > kmalloc include/linux/slab.h:551 [inline] > sctp_inet6addr_event+0x60e/0xbd0 net/sctp/ipv6.c:100 > notifier_call_chain kernel/notifier.c:93 [inline] > __atomic_notifier_call_chain kernel/notifier.c:183 [inline] > atomic_notifier_call_chain+0x13d/0x240 kernel/notifier.c:193 > inet6addr_notifier_call_chain+0x76/0x90 net/ipv6/addrconf_core.c:107 > ipv6_add_addr+0x2597/0x2890 net/ipv6/addrconf.c:1115 > inet6_addr_add+0xc86/0x1c10 net/ipv6/addrconf.c:2912 > inet6_rtm_newaddr+0x167e/0x3d20 net/ipv6/addrconf.c:4750 > rtnetlink_rcv_msg+0x1148/0x1540 net/core/rtnetlink.c:4947 > netlink_rcv_skb+0x394/0x640 net/netlink/af_netlink.c:2477 > rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4965 > netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] > netlink_unicast+0x1699/0x1740 net/netlink/af_netlink.c:1336 > netlink_sendmsg+0x13c7/0x1440 net/netlink/af_netlink.c:1917 > sock_sendmsg_nosec net/socket.c:621 [inline] > sock_sendmsg net/socket.c:631 [inline] > ___sys_sendmsg+0xe3b/0x1240 net/socket.c:2116 > __sys_sendmsg net/socket.c:2154 [inline] > __do_sys_sendmsg net/socket.c:2163 [inline] > __se_sys_sendmsg+0x305/0x460 net/socket.c:2161 > __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 > do_syscall_64+0xcf/0x110 arch/x86/entry/common.c:291 > entry_SYSCALL_64_after_hwframe+0x63/0xe7 > > Bytes 32-35 of 2100 are uninitialized > Memory access of size 2100 starts at ffff888185d8b000 > Data copied to user address 0000000020001108 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D When a network device goes up and sctp_inetaddr_event() is called, it allocates a partially initialized struct sctp_sockaddr_entry to hold the newly created address. The attached reproducer can be then used to read up to 8 uninit bytes for each of the local addresses. I guess the devices aren't created so often that this can pose any security risk, but we probably still need to allocate this structure with __GFP_ZERO. > > --- > 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. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups= "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an= email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgi= d/syzkaller-bugs/000000000000311344057c4b6cc3%40google.com. > For more options, visit https://groups.google.com/d/optout. --=20 Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Stra=C3=9Fe, 33 80636 M=C3=BCnchen Gesch=C3=A4ftsf=C3=BChrer: Paul Manicle, Halimah DeLaine Prado Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg --000000000000d08802057c581192 Content-Type: text/x-chdr; charset="US-ASCII"; name="dump_buf.h" Content-Disposition: attachment; filename="dump_buf.h" Content-Transfer-Encoding: base64 Content-ID: X-Attachment-Id: f_jpcgtlxx0 I2lmbmRlZiBEVU1QX0JVRl9ICiNkZWZpbmUgRFVNUF9CVUZfSAoKI2lmbmRlZiBEVU1QX01JTl9T VFJMRU4KI2RlZmluZSBEVU1QX01JTl9TVFJMRU4gMQojZW5kaWYKCiNpZm5kZWYgRFVNUF9QQVJB TExFTAojZGVmaW5lIERVTVBfUEFSQUxMRUwgMAojZW5kaWYKCiNpZm5kZWYgRFVNUF9QUklOVF9C VUZfQUREUgojZGVmaW5lIERVTVBfUFJJTlRfQlVGX0FERFIgMAojZW5kaWYKCiNpZm5kZWYgRFVN UF9QUklOVF9IRVgKI2RlZmluZSBEVU1QX1BSSU5UX0hFWCAwCiNlbmRpZgoKI2lmbmRlZiBEVU1Q X1BSSU5UX1NUUklORwojZGVmaW5lIERVTVBfUFJJTlRfU1RSSU5HIDAKI2VuZGlmCgojaWYgRFVN UF9QQVJBTExFTApwdGhyZWFkX211dGV4X3Qgb3V0X211dGV4ID0gUFRIUkVBRF9NVVRFWF9JTklU SUFMSVpFUjsKI2VuZGlmCgp2b2lkIGR1bXBfYnVmKHVuc2lnbmVkIGNoYXIgKmJ1ZiwgaW50IGxl bikgewogIGludCBpLCBueiA9IDA7CiAgZm9yIChpID0gMDsgaSA8IGxlbjsgaSsrKSB7CiAgICBp ZiAoYnVmW2ldKSB7CiAgICAgIG56ID0gMTsKICAgICAgYnJlYWs7CiAgICB9CiAgfQogIGlmICgh bnopIHsKICAgIC8vIFRoZSBidWZmZXIgaXMgZW1wdHkuCiAgICByZXR1cm47CiAgfSBlbHNlIHsK I2lmIERVTVBfUEFSQUxMRUwKICAgIHB0aHJlYWRfbXV0ZXhfbG9jaygmb3V0X211dGV4KTsKI2Vu ZGlmCiNpZiBEVU1QX1BSSU5UX0JVRl9BRERSCiAgICBmcHJpbnRmKHN0ZGVyciwgIm5vbmVtcHR5 IGJ1ZmZlciBhdCAlcFxuIiwgYnVmKTsKI2VuZGlmCiNpZiBEVU1QX1BSSU5UX0hFWAogICAgZm9y IChpPTA7IGkgPCBsZW47IGkrKykgewogICAgICBpZiAoYnVmW2ldKSB7CiAgICAgICAgZnByaW50 ZihzdGRlcnIsICJidWZbJWRdOiAleCAoJXApXG4iLCBpLCBidWZbaV0sICoodm9pZCoqKSZidWZb aV0pOwogICAgICB9CiAgICB9CiNlbmRpZiAvLyBEVU1QX1BSSU5UX0hFWAojaWYgRFVNUF9QQVJB TExFTAogICAgcHRocmVhZF9tdXRleF91bmxvY2soJm91dF9tdXRleCk7CiNlbmRpZgogIH0KI2lm IERVTVBfUEFSQUxMRUwKICBwdGhyZWFkX211dGV4X2xvY2soJm91dF9tdXRleCk7CiNlbmRpZgoj aWYgRFVNUF9QUklOVF9TVFJJTkcKICBmb3IgKGkgPSAwOyBpIDwgbGVuOyBpKyspIHsKICAgIGlm IChidWZbaV0pIHsKICAgICAgaW50IHN0cl9sZW4gPSBzdHJsZW4oJmJ1ZltpXSk7CiAgICAgIC8v IFNob3J0IHN0cmluZyBwaWVjZXMgYXJlIHRvbyBib3JpbmcuCiAgICAgIGlmIChzdHJfbGVuID49 IERVTVBfTUlOX1NUUkxFTikgewogICAgICAgIHVuc2lnbmVkIGNoYXIgKmM7CiAgICAgICAgZm9y IChjID0gJmJ1ZltpXTsgYyA8ICZidWZbaSArIHN0cl9sZW5dOyBjKyspIHsKICAgICAgICAgIGlm ICgoKmMgPiAxMjcpIHx8ICgoKmMgPCAzMikgJiYgKCpjICE9IDEwKSAmJiAoKmMgIT0gMTMpKSkg IHsKICAgICAgICAgICAgKmMgPSAnICc7CiAgICAgICAgICAgIGNvbnRpbnVlOwogICAgICAgICAg fQogICAgICAgIH0KICAgICAgICAvLyBEdW1wIHRoZSBidWZmZXIuCiAgICAgICAgZnByaW50Zihz dGRlcnIsICIlc1xuIiwgJmJ1ZltpXSk7CiAgICAgIH0KICAgICAgaSArPSBzdHJfbGVuOwogICAg fQogIH0KI2VuZGlmIC8vIERVTVBfUFJJTlRfU1RSSU5HCiNpZiBEVU1QX1BBUkFMTEVMCiAgcHRo cmVhZF9tdXRleF91bmxvY2soJm91dF9tdXRleCk7CiNlbmRpZgp9CgojZW5kaWYK --000000000000d08802057c581192 Content-Type: text/x-csrc; charset="US-ASCII"; name="getsockopt.c" Content-Disposition: attachment; filename="getsockopt.c" Content-Transfer-Encoding: base64 Content-ID: X-Attachment-Id: f_jpcgttur1 I2luY2x1ZGUgPHN0ZGlvLmg+CiNpbmNsdWRlIDxwdGhyZWFkLmg+CiNpbmNsdWRlIDxzeXMvdHlw ZXMuaD4gICAgICAgICAgLyogU2VlIE5PVEVTICovCiNpbmNsdWRlIDxzeXMvc29ja2V0Lmg+CiNp bmNsdWRlIDx1bmlzdGQuaD4KCiNkZWZpbmUgRFVNUF9QQVJBTExFTCAxCiNkZWZpbmUgRFVNUF9Q UklOVF9CVUZfQUREUiAxCiNkZWZpbmUgRFVNUF9QUklOVF9TVFJJTkcgMQojZGVmaW5lIERVTVBf UFJJTlRfSEVYIDEKI2luY2x1ZGUgImR1bXBfYnVmLmgiCgp2b2lkICpzZXRzb2Nrb3B0X2ZuKHZv aWQgKmFyZykgewogIGludCBzb2NrID0gKGludClhcmc7CiAgc3RydWN0IHNvY2thZGRyIGFkZHI7 CiAgbWVtc2V0KCZhZGRyLCAwLCBzaXplb2YoYWRkcikpOwogIGFkZHIuc2FfZmFtaWx5ID0gMjsK ICBhZGRyLnNhX2RhdGFbMl0gPSAweGFjOwogIGFkZHIuc2FfZGF0YVszXSA9IDB4MTQ7CiAgYWRk ci5zYV9kYXRhWzRdID0gMHgxNDsKICBzZXRzb2Nrb3B0KHNvY2ssIDB4ODQsIDB4NmUsICZhZGRy LCAweDEwKTsKfQoKI2RlZmluZSBCVUZMRU4gKDB4MmMyKQp2b2lkICpnZXRzb2Nrb3B0X2ZuKHZv aWQgKmFyZykgewogIGludCBzb2NrID0gKGludClhcmc7CiAgY2hhciBidWZbQlVGTEVOXTsKICBt ZW1zZXQoYnVmLCAwLCBCVUZMRU4pOwogIGludCBzb2NrbGVuID0gQlVGTEVOOwogIGdldHNvY2tv cHQoc29jaywgMHg4NCwgLypTQ1RQX0dFVF9MT0NBTF9BRERSUyovMHg2ZCwgYnVmLCAmc29ja2xl bik7CiAgZHVtcF9idWYoJihidWZbOF0pLCAzMik7Cn0KCnZvaWQgZG9fd29yayhpbnQgc29jaykg ewogIHB0aHJlYWRfdCB0MSwgdDI7CiAgZm9yIChpbnQgaSA9IDA7IGkgPCAxMDsgaSsrKSB7CiAg ICBwdGhyZWFkX2NyZWF0ZSgmdDEsIE5VTEwsIGdldHNvY2tvcHRfZm4sICh2b2lkKilzb2NrKTsK ICAgIHB0aHJlYWRfY3JlYXRlKCZ0MiwgTlVMTCwgc2V0c29ja29wdF9mbiwgKHZvaWQqKXNvY2sp OwogICAgdXNsZWVwKDEwMCk7CiAgfQp9CgppbnQgbWFpbihpbnQgYXJnYywgY2hhciAqYXJndltd KSB7CiAgaW50IHJlczsKICBpbnQgcGlkID0gZm9yaygpOwogIGlmIChwaWQgPT0gMCkgewogICAg aW50IHNvY2sgPSBzb2NrZXQoMHgyLCAweDEsIDB4ODQpOwogICAgZG9fd29yayhzb2NrKTsKICB9 CiAgc2xlZXAoMTApOwogIHJldHVybiAwOwp9Cg== --000000000000d08802057c581192--