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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 B3EF4C433E0 for ; Fri, 26 Feb 2021 06:59:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 458D760238 for ; Fri, 26 Feb 2021 06:59:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230001AbhBZG7N (ORCPT ); Fri, 26 Feb 2021 01:59:13 -0500 Received: from mail-io1-f72.google.com ([209.85.166.72]:45172 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229894AbhBZG6y (ORCPT ); Fri, 26 Feb 2021 01:58:54 -0500 Received: by mail-io1-f72.google.com with SMTP id u1so6403515ior.12 for ; Thu, 25 Feb 2021 22:58:38 -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=HvtxSlnkKCjNyZT0wEb2/bz1bqloYHt5btZDhiiQNMw=; b=SfyGZTKHSajSxlv7zlIRxZSwR9pZcRG1fiQinu4kElj8I3S4XGFzN9pCD5c30UGSWg Gy9S3t4jyB/SDBf8ZWEW9tCWYDyPaHcXHKmsLFxFQUh+wZRmTTUtLJHK+EQo002rjJHi /VTAZ0Zdl8+04cCurfAkcT0G54ScfkHPyh+NJmJ8M5OYdhv6GlOn3NGGvq4WsOmDwVdk diN2n/qQ6bSkZnI72XdS3uNYSKByyW6jZeC0axljj4MmAVkcZM/gwqrnMddRDUuxUXBG kL2uxPFAw8rjK7VQKT/EYibVPh6s0HFLDPQuJwnGzgZmNIfUP57kJq05z/eKgA7fDm50 R7Yg== X-Gm-Message-State: AOAM533jeUI8jow7zwkB+XfxD+/La+8EusMrz4L+093m9YudEiaZm5NU hpFt0KJbE0WJ93BUpQzxvwHIPaOmqtcfiUUeOiETNz0Mef6Q X-Google-Smtp-Source: ABdhPJxI+mzmBz1ZfCN/cLim2VzndeY1gOTYkUwCuSZQxW+bnQAaX6rYquy9IfcqPUVm5FDdKSv/xgFFPP6FOCZzWXi7kf3Xvd3b MIME-Version: 1.0 X-Received: by 2002:a92:6403:: with SMTP id y3mr1283700ilb.90.1614322692653; Thu, 25 Feb 2021 22:58:12 -0800 (PST) Date: Thu, 25 Feb 2021 22:58:12 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a6093b05bc37caae@google.com> Subject: general protection fault in kvm_hv_irq_routing_update From: syzbot To: aaronlewis@google.com, bp@alien8.de, drjones@redhat.com, graf@amazon.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, makarandsonare@google.com, mingo@redhat.com, pbonzini@redhat.com, seanjc@google.com, shuah@kernel.org, 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: a99163e9 Merge tag 'devicetree-for-5.12' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12d72682d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7a875029a795d230 dashboard link: https://syzkaller.appspot.com/bug?extid=6987f3b2dbd9eda95f12 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12faef12d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=163342ccd00000 The issue was bisected to: commit 8f014550dfb114cc7f42a517d20d2cf887a0b771 Author: Vitaly Kuznetsov Date: Tue Jan 26 13:48:14 2021 +0000 KVM: x86: hyper-v: Make Hyper-V emulation enablement conditional bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10df16a8d00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=12df16a8d00000 console output: https://syzkaller.appspot.com/x/log.txt?x=14df16a8d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6987f3b2dbd9eda95f12@syzkaller.appspotmail.com Fixes: 8f014550dfb1 ("KVM: x86: hyper-v: Make Hyper-V emulation enablement conditional") L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. general protection fault, probably for non-canonical address 0xdffffc0000000028: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000140-0x0000000000000147] CPU: 1 PID: 8370 Comm: syz-executor859 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:synic_get arch/x86/kvm/hyperv.c:165 [inline] RIP: 0010:kvm_hv_set_sint_gsi arch/x86/kvm/hyperv.c:475 [inline] RIP: 0010:kvm_hv_irq_routing_update+0x230/0x460 arch/x86/kvm/hyperv.c:498 Code: 80 19 00 00 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 ff 01 00 00 4d 8b ad 80 19 00 00 49 8d bd 40 01 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 74 06 0f 8e d2 01 00 00 45 0f b6 bd 40 01 00 00 RSP: 0018:ffffc90001b3fac0 EFLAGS: 00010206 RAX: 0000000000000028 RBX: ffff888012df5900 RCX: 0000000000000000 RDX: ffff888022193780 RSI: ffffffff81174d43 RDI: 0000000000000140 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffc900018819eb R10: ffffffff81170f3e R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000a73300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557e8c876888 CR3: 0000000013c0b000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kvm_set_irq_routing+0x69b/0x940 arch/x86/kvm/../../../virt/kvm/irqchip.c:223 kvm_vm_ioctl+0x12d0/0x2800 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3959 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 RIP: 0033:0x43ef29 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe391eb808 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ef29 RDX: 0000000020000140 RSI: 000000004008ae6a RDI: 0000000000000004 RBP: 0000000000402f10 R08: 0000000000400488 R09: 0000000000400488 R10: 0000000000400488 R11: 0000000000000246 R12: 0000000000402fa0 R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488 Modules linked in: ---[ end trace 2aa75ec1dd148710 ]--- RIP: 0010:synic_get arch/x86/kvm/hyperv.c:165 [inline] RIP: 0010:kvm_hv_set_sint_gsi arch/x86/kvm/hyperv.c:475 [inline] RIP: 0010:kvm_hv_irq_routing_update+0x230/0x460 arch/x86/kvm/hyperv.c:498 Code: 80 19 00 00 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 ff 01 00 00 4d 8b ad 80 19 00 00 49 8d bd 40 01 00 00 48 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 74 06 0f 8e d2 01 00 00 45 0f b6 bd 40 01 00 00 RSP: 0018:ffffc90001b3fac0 EFLAGS: 00010206 RAX: 0000000000000028 RBX: ffff888012df5900 RCX: 0000000000000000 RDX: ffff888022193780 RSI: ffffffff81174d43 RDI: 0000000000000140 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffc900018819eb R10: ffffffff81170f3e R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000a73300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557e8c876888 CR3: 0000000013c0b000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches