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 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 24E20C433E0 for ; Tue, 22 Dec 2020 08:36:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E8A4223127 for ; Tue, 22 Dec 2020 08:36:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726138AbgLVIg6 (ORCPT ); Tue, 22 Dec 2020 03:36:58 -0500 Received: from mail-io1-f72.google.com ([209.85.166.72]:46161 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725785AbgLVIg5 (ORCPT ); Tue, 22 Dec 2020 03:36:57 -0500 Received: by mail-io1-f72.google.com with SMTP id a2so6999756iod.13 for ; Tue, 22 Dec 2020 00:36:42 -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=6myWaa8K9xi7b8Wgl0oK5a7b+azrf32/eUO0QSEaWnw=; b=nqCsOhN4N+gwBsSjVsRVMxkTYP89Inn3U79hGdS/rTe9PTBPPAe2HsEFASKN5uuJnX NTpuhBRpl3c/nS2QKKCReIP+QBseh9qg5iQvzxep/13sl6AJzfUpRc6EYsT7c5NnJVXe 3YJ2QKSktOHDdULGMRSs/6bi7kQo+pb8jdGt9JlODlkeRR2D/CaGEut6qA0yRVJ/gxo0 QWVvJjI4ZaEXgNsbB8+LKiqb1iUaaxGzsW1J9HErRQWzus88HjunxcXJCT9hrtdZR6LI IJ0n66v5sz6I6v6V/jkob7xH/2MIumlibg+oXUxyUHCiaXlOJT3FWaM966Tq7/PCR2Ie /HIA== X-Gm-Message-State: AOAM5334zX1wkZO2fdLSfpt7eCCnXYn/ZRx4ZRf/gxrlDDUR1ioOieY7 9kT7exRhyYjXklyxZSe0zfOo+m5SvERcLGZ6hliy5JpAfERo X-Google-Smtp-Source: ABdhPJw19rvJhuyRqPbLIQThv+MeiywSWq0qGCnFzM0se/RZMldtYABf1arArUipx8jI1HrZhjzhf2nLweWYWXsVQtDzGETbqANF MIME-Version: 1.0 X-Received: by 2002:a05:6e02:8aa:: with SMTP id a10mr8245101ilt.157.1608626176594; Tue, 22 Dec 2020 00:36:16 -0800 (PST) Date: Tue, 22 Dec 2020 00:36:16 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d5173d05b7097755@google.com> Subject: UBSAN: shift-out-of-bounds in kvm_vcpu_after_set_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, seanjc@google.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 5e60366d Merge tag 'fallthrough-fixes-clang-5.11-rc1' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11c7046b500000 kernel config: https://syzkaller.appspot.com/x/.config?x=db720fe37a6a41d8 dashboard link: https://syzkaller.appspot.com/bug?extid=e87846c48bf72bc85311 compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386 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+e87846c48bf72bc85311@syzkaller.appspotmail.com ================================================================================ UBSAN: shift-out-of-bounds in arch/x86/kvm/mmu.h:52:16 shift exponent 64 is too large for 64-bit type 'long long unsigned int' CPU: 1 PID: 11156 Comm: syz-executor.1 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395 rsvd_bits arch/x86/kvm/mmu.h:52 [inline] kvm_vcpu_after_set_cpuid.cold+0x35/0x3a arch/x86/kvm/cpuid.c:181 kvm_vcpu_ioctl_set_cpuid+0x28e/0x970 arch/x86/kvm/cpuid.c:273 kvm_arch_vcpu_ioctl+0x1091/0x2d70 arch/x86/kvm/x86.c:4699 kvm_vcpu_ioctl+0x7b9/0xdb0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3386 kvm_vcpu_compat_ioctl+0x1a2/0x340 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3430 __do_compat_sys_ioctl+0x1d3/0x230 fs/ioctl.c:842 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fe8549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f55e20cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000004008ae8a RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ================================================================================ --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.