linux-kernel - Re: [PATCH v3] x86/bugs: Only harden syscalls when needed

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]

Message-ID: <20240419003139.kjfepjhjcjzexqpr@treble>
Date: Thu, 18 Apr 2024 17:31:39 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Christoph Hellwig <hch@...radead.org>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexandre Chartre <alexandre.chartre@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	KP Singh <kpsingh@...nel.org>, Waiman Long <longman@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v3] x86/bugs: Only harden syscalls when needed

On Wed, Apr 17, 2024 at 11:50:55PM -0700, Christoph Hellwig wrote:
> On Tue, Apr 16, 2024 at 04:02:21PM -0700, Josh Poimboeuf wrote:
> > Syscall hardening (i.e., converting the syscall indirect branch to a
> > series of direct branches) may cause performance regressions in certain
> > scenarios.
> 
> Maybe spell out the scenarios, as this just sounds like hand waiving
> right now..

Will do.

-- 
Josh