linux-kernel - Re: [PATCH] uprobes: use vm_special

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Message-ID: <20240903193232.GK17936@redhat.com>
Date: Tue, 3 Sep 2024 21:32:32 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Sven Schnelle <svens@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] uprobes: use vm_special_mapping close() functionality

On 09/03, Linus Torvalds wrote:
>
> On Tue, 3 Sept 2024 at 02:09, Oleg Nesterov <oleg@...hat.com> wrote:
> >
> > but with or without this fix __create_xol_area() also needs
> >
> >         area->xol_mapping.mremap = NULL;
>
> I think the whole thing needs to be zeroed out.

Agreed,

> Either use kzalloc(),

This is what Sven did in

	[PATCH] uprobes: use kzalloc to allocate xol area
	https://lore.kernel.org/all/20240903102313.3402529-1-svens@linux.ibm.com/

Oleg.