linux-kernel - RE: [PATCH] x86/resctrl: Fix uninitialized memory read when last CPU of domain goes offline

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Message-ID: <SJ1PR11MB60834E052730418BA2CF8E7BFC3B2@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Thu, 28 Mar 2024 22:51:16 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "Chatre, Reinette" <reinette.chatre@...el.com>, "Yu, Fenghua"
	<fenghua.yu@...el.com>, "bp@...en8.de" <bp@...en8.de>, "james.morse@....com"
	<james.morse@....com>, "peternewman@...gle.com" <peternewman@...gle.com>,
	"babu.moger@....com" <babu.moger@....com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "mingo@...hat.com" <mingo@...hat.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "x86@...nel.org"
	<x86@...nel.org>
CC: "hpa@...or.com" <hpa@...or.com>, "james.greenhalgh@....com"
	<james.greenhalgh@....com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] x86/resctrl: Fix uninitialized memory read when last CPU
 of domain goes offline

> Add a tick_nohz_full_enabled() check to ensure that tick_nohz_full_mask
> has been initialized and can thus be accessed safely.
>
> Fixes: a4846aaf3945 ("x86/resctrl: Add cpumask_any_housekeeping() for limbo/overflow")
> Reported-by: Tony Luck <tony.luck@...el.com>
> Closes: https://lore.kernel.org/lkml/ZgIFT5gZgIQ9A9G7@agluck-desk3/
> Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>

Tested-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Tony Luck <tony.luck@...el.com>

-Tony