linux-kernel - Re: [PATCH 1/1] x86/elf: Add a new .note section containing Xfeatures information to x86 core files

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: Sat, 16 Mar 2024 00:51:28 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...el.com>
Cc: Vignesh Balasubramanian <vigbalas@....com>,
 linux-kernel@...r.kernel.org, linux-toolchains@...r.kernel.org,
 mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
 aneesh.kumar@...nel.org, naveen.n.rao@...ux.ibm.com,
 ebiederm@...ssion.com, keescook@...omium.org, x86@...nel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
 jinisusan.george@....com, matz@...e.de, binutils@...rceware.org,
 jhb@...ebsd.org, felix.willgerodt@...el.com
Subject: Re: [PATCH 1/1] x86/elf: Add a new .note section containing
 Xfeatures information to x86 core files

On Thu, Mar 14 2024 at 17:29, Borislav Petkov wrote:
> On Thu, Mar 14, 2024 at 09:19:15AM -0700, Dave Hansen wrote:
>> Are you envisioning an *XSAVE* state component that's not described by
>> CPUID?
>
> I want to be prepared. You can imagine some of the short cuts and
> corners cutting hw guys would do so I'd want to be prepared there and
> not tie this to CPUID.

Anything which is not enumerated in CPUID does not exist in
XSTATE. Period and end of story.

Stop paving the way for hardware people to have an excuse for being
stupid.

Aside of that XSTATE is a dead end as we all know.

Thanks,

        tglx