linux-kernel - Re: [PATCH] arm64: uprobes: Optimize cache flushes for xol slot

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Message-ID: <20240926160823.GA2592@redhat.com>
Date: Thu, 26 Sep 2024 18:08:24 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: "Liao, Chang" <liaochang1@...wei.com>
Cc: Will Deacon <will@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>, mhiramat@...nel.org,
	peterz@...radead.org, mark.rutland@....com,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: uprobes: Optimize cache flushes for xol slot

On 09/26, Liao, Chang wrote:
>
> 在 2024/9/23 18:52, Oleg Nesterov 写道:
> > On 09/23, Will Deacon wrote:
> >>
> >> However, we should use __GFP_ZERO anyway
> >> because I don't think it's a good idea to map an uninitialised page into
> >> userspace.
> >
> > Agreed, and imo this even needs a separate "fix info leak" patch.
>
> Do you mean to fill the entire page with CPU specific illegal instructions
> in this patch?

Hmm. Why?? No... OK, I'll write the changelog and send the trivial patch
in a minute.

Oleg.