linux-kernel - Re: [syzbot] KMSAN: uninit-value in kvm

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Message-ID: <YVclio5ny4ziKQer@google.com>
Date:   Fri, 1 Oct 2021 15:13:14 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     syzbot <syzbot+d6d011bc17bb751d4aa2@...kaller.appspotmail.com>
Cc:     bp@...en8.de, dave.hansen@...ux.intel.com, glider@...gle.com,
        hpa@...or.com, jarkko@...nel.org, jmattson@...gle.com,
        joro@...tes.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sgx@...r.kernel.org, mingo@...hat.com, pbonzini@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        vkuznets@...hat.com, wanpengli@...cent.com, x86@...nel.org
Subject: Re: [syzbot] KMSAN: uninit-value in kvm_cpuid

On Thu, Sep 30, 2021, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    cd2c05533838 DO-NOT-SUBMIT: kmsan: suppress a report in ke..
> git tree:       https://github.com/google/kmsan.git master
> console output: https://syzkaller.appspot.com/x/log.txt?x=11373b17300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=978f1b2d7a5aad3e
> dashboard link: https://syzkaller.appspot.com/bug?extid=d6d011bc17bb751d4aa2
> compiler:       clang version 14.0.0 (git@...hub.com:llvm/llvm-project.git 0996585c8e3b3d409494eb5f1cad714b9e1f7fb5), GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14b6c4cb300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10fdb00f300000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d6d011bc17bb751d4aa2@...kaller.appspotmail.com

#syz fix: KVM: x86: Swap order of CPUID entry "index" vs. "significant flag" checks