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_HELO_NONE,SPF_PASS 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 B9AD1C432C0 for ; Wed, 4 Dec 2019 04:15:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9455E207DD for ; Wed, 4 Dec 2019 04:15:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726958AbfLDEPK (ORCPT ); Tue, 3 Dec 2019 23:15:10 -0500 Received: from mail-io1-f72.google.com ([209.85.166.72]:38691 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726834AbfLDEPJ (ORCPT ); Tue, 3 Dec 2019 23:15:09 -0500 Received: by mail-io1-f72.google.com with SMTP id q4so4177367ion.5 for ; Tue, 03 Dec 2019 20:15:09 -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=VdLPHplMVsVl+WlOVsGf2sKVRxVRuxnwgs0jCt2nif4=; b=plxTUoxeRMfeHkGPn63Y8uhdwEyC3QhnYRipWcHxgFPvR53zInb7sIdc8b19TRnPws W5dZ2Iog16yZUfv4ohXUxcaZ4nSyO8RAet4sI6EfEztrruK7F5Dfv1xDwm7Mu4svo6Mq J3G96slYdKTrGz5YGoUlbnVM9GZhy+w4ypcxeoE7ulC58n1ovonjupkb8oISAXv8R1gx r2RdSQvjQIq7cpwH1ro7cbvjn2rWcJFuwzTVbO3n9qebCmoU77ZgaLgz3pQwjp+LJ4Wa 8eyEZWjvuJ2GWlwdrFnsF3OVf2e1t6DgCy3/DHiAYpjdE3Hts/pWLkygHeKVyb/XOzn4 Mmsg== X-Gm-Message-State: APjAAAUBbBv7cL7eX9fBB9ysq2CozRBCluv6cdTL2Ps9LhkMC+6NuUpG m+r1WouNtwoSWWPqNMPrlHbGLDQvugNOsQ/Rwoom2lFQK390 X-Google-Smtp-Source: APXvYqzeIvGu/yNE0BUV2pKlhsrk2vzxeUv9IQ64GsXDF0KB5XQbnNvLZAyOqS9dnWMwMWmCQDWTNeZRvItsw9hi1x8sW58C5vyf MIME-Version: 1.0 X-Received: by 2002:a5d:9f05:: with SMTP id q5mr683388iot.295.1575432909116; Tue, 03 Dec 2019 20:15:09 -0800 (PST) Date: Tue, 03 Dec 2019 20:15:09 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ea5ec20598d90e50@google.com> Subject: KASAN: vmalloc-out-of-bounds Write in kvm_dev_ioctl_get_cpuid From: syzbot To: bp@alien8.de, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, pbonzini@redhat.com, rkrcmar@redhat.com, sean.j.christopherson@intel.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 596cf45c Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=103acb7ae00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8eb54eee6e6ca4a7 dashboard link: https://syzkaller.appspot.com/bug?extid=e3f4897236c4eeb8af4f compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15b87c82e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11250f36e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e3f4897236c4eeb8af4f@syzkaller.appspotmail.com ================================================================== BUG: KASAN: vmalloc-out-of-bounds in __do_cpuid_func_emulated arch/x86/kvm/cpuid.c:323 [inline] BUG: KASAN: vmalloc-out-of-bounds in do_cpuid_func arch/x86/kvm/cpuid.c:814 [inline] BUG: KASAN: vmalloc-out-of-bounds in do_cpuid_func arch/x86/kvm/cpuid.c:810 [inline] BUG: KASAN: vmalloc-out-of-bounds in kvm_dev_ioctl_get_cpuid+0xad7/0xb0b arch/x86/kvm/cpuid.c:891 Write of size 4 at addr ffffc90000d36050 by task syz-executor490/9767 CPU: 1 PID: 9767 Comm: syz-executor490 Not tainted 5.4.0-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:638 __asan_report_store4_noabort+0x17/0x20 mm/kasan/generic_report.c:139 __do_cpuid_func_emulated arch/x86/kvm/cpuid.c:323 [inline] do_cpuid_func arch/x86/kvm/cpuid.c:814 [inline] do_cpuid_func arch/x86/kvm/cpuid.c:810 [inline] kvm_dev_ioctl_get_cpuid+0xad7/0xb0b arch/x86/kvm/cpuid.c:891 kvm_arch_dev_ioctl+0x300/0x4b0 arch/x86/kvm/x86.c:3387 kvm_dev_ioctl+0x127/0x17d0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3593 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:539 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:726 ksys_ioctl+0xab/0xd0 fs/ioctl.c:743 __do_sys_ioctl fs/ioctl.c:750 [inline] __se_sys_ioctl fs/ioctl.c:748 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:748 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440159 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd106332c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440159 RDX: 0000000020000080 RSI: 00000000c008ae09 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004019e0 R13: 0000000000401a70 R14: 0000000000000000 R15: 0000000000000000 Memory state around the buggy address: ffffc90000d35f00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ffffc90000d35f80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 > ffffc90000d36000: 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 ^ ffffc90000d36080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ffffc90000d36100: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ================================================================== --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches