linux-kernel - RE: [PATCH 09/19] kvm: x86: Prepare reallocation check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <BN9PR11MB5276416CED5892C20F56EB888C759@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 14 Dec 2021 07:06:40 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        "Zhong, Yang" <yang.zhong@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
CC:     "Christopherson,, Sean" <seanjc@...gle.com>,
        "Nakajima, Jun" <jun.nakajima@...el.com>,
        "jing2.liu@...ux.intel.com" <jing2.liu@...ux.intel.com>,
        "Liu, Jing2" <jing2.liu@...el.com>
Subject: RE: [PATCH 09/19] kvm: x86: Prepare reallocation check

> From: Paolo Bonzini
> Sent: Monday, December 13, 2021 5:16 PM
> 
> 
> - if (dynamic_enabled & ~guest_fpu->user_perm) != 0, then this is a
> userspace error and you can #GP the guest without any issue.  Userspace
> is buggy
> 

Is it a general guideline that an error caused by emulation itself (e.g.
due to no memory) can be reflected into the guest as #GP, even
when from guest p.o.v there is nothing wrong with its setting?

Thanks
Kevin