linux-kernel - Re: [PATCH v2 2/2] arm64/module: Use text-poke API for late relocations.

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Message-ID: <CAPhsuW7z2rdNK3w9Hpwh8FXy29fSUNGKyAw0GbUqfxnfgsfg_Q@mail.gmail.com>
Date: Mon, 21 Apr 2025 23:25:04 -0700
From: Song Liu <song@...nel.org>
To: Dylan Hatch <dylanbhatch@...gle.com>
Cc: Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Puranjay Mohan <puranjay@...nel.org>, 
	Xu Kuohai <xukuohai@...weicloud.com>, Philippe Mathieu-Daudé <philmd@...aro.org>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	"Mike Rapoport (Microsoft)" <rppt@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
	Geert Uytterhoeven <geert@...ux-m68k.org>, Luis Chamberlain <mcgrof@...nel.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, Ard Biesheuvel <ardb@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Roman Gushchin <roman.gushchin@...ux.dev>
Subject: Re: [PATCH v2 2/2] arm64/module: Use text-poke API for late relocations.

On Mon, Apr 21, 2025 at 5:35 PM Song Liu <song@...nel.org> wrote:
>
> On Fri, Apr 11, 2025 at 6:10 PM Dylan Hatch <dylanbhatch@...gle.com> wrote:
> >
> > To enable late module patching, livepatch modules need to be able to
> > apply some of their relocations well after being loaded. In this
> > scenario, use the text-poking API to allow this, even with
> > STRICT_MODULE_RWX.
> >
> > This patch is largely based off commit 88fc078a7a8f6 ("x86/module: Use
> > text_poke() for late relocations").
> >
> > Signed-off-by: Dylan Hatch <dylanbhatch@...gle.com>

Could you please share how you test this?

Thanks,
Song


> Acked-by: Song Liu <song@...nel.org>