linux-kernel - bisected: [PATCH V4] x86/apic: Always explicitly disarm TSC-deadline timer

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-next>] [day] [month] [year] [list]

Message-ID: <20241128111844.GE10431@google.com>
Date: Thu, 28 Nov 2024 20:18:44 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Zhang Rui <rui.zhang@...el.com>
Cc: hpa@...or.com, peterz@...radead.org, thorsten.blum@...lux.com,
	yuntao.wang@...ux.dev, tony.luck@...el.com, len.brown@...el.com,
	srinivas.pandruvada@...el.com, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	bp@...en8.de, dave.hansen@...ux.intel.com,
	rafael.j.wysocki@...el.com, x86@...nel.org,
	linux-pm@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: bisected: [PATCH V4] x86/apic: Always explicitly disarm TSC-deadline
 timer

Hi folks,
sorry if messed something up, this email has never been in my inbox.

> Disable the TSC Deadline timer in lapic_timer_shutdown() by writing to
> MSR_IA32_TSC_DEADLINE when in TSC-deadline mode. Also avoid writing
> to the initial-count register (APIC_TMICT) which is ignored in
> TSC-deadline mode.

So this commit hit stable and we now see section mismatch errors:

// stripped

WARNING: vmlinux.o(__ex_table+0x447c): Section mismatch in reference from the (unknown reference) (unknown) to the (unknown reference) .irqentry.text:(unknown)
The relocation at __ex_table+0x447c references
section ".irqentry.text" which is not in the list of
authorized sections.

WARNING: vmlinux.o(__ex_table+0x4480): Section mismatch in reference from the (unknown reference) (unknown) to the (unknown reference) .irqentry.text:(unknown)
The relocation at __ex_table+0x4480 references
section ".irqentry.text" which is not in the list of
authorized sections.

FATAL: modpost: Section mismatches detected.

Specifically because of wrmsrl.

I'm aware of the section mismatch errors on linux-5.4 (I know), not
aware of any other stable versions (but I haven't checked).  Is this
something specific to linux-5.4?