linux-kernel - Re: [PATCH v2 1/1] x86/rdrand: disable RDSEED on AMD Cyan Skillfish

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 for Android: free password hash cracker in your pocket

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

Message-ID: <cbb411e3-cdd9-48df-988b-04bb09268ebc@mixaill.net>
Date: Sun, 6 Jul 2025 23:31:25 +0300
From: Mikhail Paulyshka <me@...aill.net>
To: Borislav Petkov <bp@...en8.de>
Cc: Mario Limonciello <mario.limonciello@....com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org, Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH v2 1/1] x86/rdrand: disable RDSEED on AMD Cyan Skillfish

On 7/6/25 8:07 PM, Borislav Petkov wrote:
> Looks like it GPs because CR4.PCID == 0.
>
> Looks weird, we need to check PCID support somewhere, it seems.
>
> Ok, let's get a common code base - 6.15. Pls boot it, send me full dmesg again

dmesg with vanilla 6.15.0:
https://mixaill.net/linux-kernel-lists/bc250_log_invlpgb-2-dmesg.txt

>   your .config
https://raw.githubusercontent.com/openSUSE/kernel-source/4552ba89cbebd55482508c4ba4fc290df58f9386/config/x86_64/vanilla
>   and the output of cpuid -1r
https://mixaill.net/linux-kernel-lists/bc250_log_invlpgb-2-cpuid.txt