linux-kernel - Re: [RFC] Circumventing FineIBT Via Entrypoints

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Message-ID: <20250214100545.GG21726@noisy.programming.kicks-ass.net>
Date: Fri, 14 Feb 2025 11:05:45 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Andrew Cooper <andrew.cooper3@...rix.com>
Cc: Kees Cook <kees@...nel.org>, jannh@...gle.com, jmill@....edu,
	joao@...rdrivepizza.com, linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org, luto@...nel.org,
	samitolvanen@...gle.com
Subject: Re: [RFC] Circumventing FineIBT Via Entrypoints

On Thu, Feb 13, 2025 at 08:41:16PM +0000, Andrew Cooper wrote:

> The problem is that SYSCALL entry/exit is a toxic operating mode,
> because you only have to think about sneezing and another user->kernel
> priv-esc appears.

For a very brief moment I thought we could leave out the ENDBR there and
eat the #CP, but 1) slow, and 2) then #CP needs to be an IST and ARGHH.

So yeah, I didn't just suggest anything at all.

I hate all this.