linux-kernel - Re: [PATCH 2/2] tools/power/turbostat: Fix division by zero when TDP calculation fails

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] [day] [month] [year] [list]

Message-ID: <CAJvTdKmr=AVo7UQP28EeD6oLzyeOM+vGCjZZMBo1bV=4n1pcmg@mail.gmail.com>
Date: Mon, 1 Dec 2025 14:14:26 -0500
From: Len Brown <lenb@...nel.org>
To: "Ehlert, Emily" <ehemily@...zon.de>
Cc: "Zhang, Rui" <rui.zhang@...el.com>, 
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Emily Ehlert <ehemily@...zon.com>
Subject: Re: [PATCH 2/2] tools/power/turbostat: Fix division by zero when TDP
 calculation fails

> I'll send you a patch for this later today.

Please try the latest turbostat in my public tree:
git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux.git turbostat

The top commit should be this:

commit 4b295ae45d3e6eb4d811c8fc2408b9e4e91c9474 (turbostat, next)
Author: Len Brown <len.brown@...el.com>
Date:   Sun Nov 30 00:11:22 2025 -0500

    tools/power turbostat: Validate that RAPL MSRs really exist

    Even though the platform->plat_rapl_msrs enumeration may be accurate,
    a VM may deny access to the underlying MSRs.

    Probe if PKG_ENERGY is readable and non-zero.
    If no, ignore all RAPL MSRs.

    Reported-by: Emily Ehlert <ehemily@...zon.de>
    Signed-off-by: Len Brown <len.brown@...el.com>