linux-kernel - Re: [PATCH AUTOSEL 6.12 1/5] uprobes: sanitiize xol_free_insn

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Message-ID: <20241124143650.GB28360@redhat.com>
Date: Sun, 24 Nov 2024 15:36:50 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Sasha Levin <sashal@...nel.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>, mhiramat@...nel.org,
	mingo@...hat.com, acme@...nel.org, namhyung@...nel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.12 1/5] uprobes: sanitiize xol_free_insn_slot()

On 11/24, Sasha Levin wrote:
>
> On Sun, Nov 24, 2024 at 02:13:57PM +0100, Oleg Nesterov wrote:
> >Hi Sasha,
> >
> >but why do you think it makes sense to backport these "uprobes" cleanups?
>
> If it doesn't, I'm happy to drop them. This commit was selected mostly
> because of:

I'd suggest to drop.

> >>1. Clear utask->xol_vaddr unconditionally, even if this addr is not valid,
> >>   xol_free_insn_slot() should never return with utask->xol_vaddr != NULL.
>
> Which sounded to me like more than a cleanup.

Sorry for confusion. This patch doesn't make much sense without the next
changes.

Oleg.