linux-kernel - Re: [PATCH v5 2/2] drivers/virt: vmgenid: add vm generation id driver

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]

Date:   Tue, 9 Feb 2021 09:55:32 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Adrian Catangiu <acatan@...zon.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        qemu-devel@...gnu.org, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org, gregkh@...uxfoundation.org,
        graf@...zon.com, rdunlap@...radead.org, arnd@...db.de,
        ebiederm@...ssion.com, rppt@...nel.org, 0x7f454c46@...il.com,
        borntraeger@...ibm.com, Jason@...c4.com, jannh@...gle.com,
        w@....eu, colmmacc@...zon.com, luto@...nel.org, tytso@....edu,
        ebiggers@...nel.org, dwmw@...zon.co.uk, bonzini@....org,
        sblbir@...zon.com, raduweis@...zon.com, corbet@....net,
        mhocko@...nel.org, rafael@...nel.org, pavel@....cz,
        mpe@...erman.id.au, areber@...hat.com, ovzxemul@...il.com,
        avagin@...il.com, ptikhomirov@...tuozzo.com, gil@...l.com,
        asmehra@...hat.com, dgunigun@...hat.com, vijaysun@...ibm.com,
        oridgar@...il.com, ghammer@...hat.com
Subject: Re: [PATCH v5 2/2] drivers/virt: vmgenid: add vm generation id driver

> +The ``vmgenid`` driver uses ACPI events to be notified by hardware
> +changes to the 128-bit Vm Gen Id UUID.

That's ok, problem is ACPI event processing is asynchronous.
What we need is thus to flush out ACPI events whenever userspace
does a read, otherwise the value it gets will be stale.

-- 
MST