linux-kernel - Re: [PATCH] rust: add basic ELF sections parser

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Message-ID: <2025053050-maggot-landfall-d5eb@gregkh>
Date: Fri, 30 May 2025 11:01:33 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: Danilo Krummrich <dakr@...nel.org>, Timur Tabi <timur@...nel.org>,
	John Hubbard <jhubbard@...dia.com>, Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] rust: add basic ELF sections parser

On Fri, May 30, 2025 at 03:59:03PM +0900, Alexandre Courbot wrote:
> On Fri May 30, 2025 at 3:22 PM JST, Greg KH wrote:
> > On Fri, May 30, 2025 at 09:58:02AM +0900, Alexandre Courbot wrote:
> >> However, Nova also supports a couple of older chip generations that use
> >> the same GSP firmware -  it is for these that the ELF unpacking must
> >> occur in the kernel. IIUC this has to do with the capabilities of the
> >> microcontroller that ultimately does the loading (more capable RISC-V on
> >> Hopper+ vs. older and more limited Falcon).
> >
> > Why specifically does the kernel have to get involved here?  What
> > requires it to do it that userspace can not?
> 
> I don't know of a user-space tool that is readily available and could
> perform such extraction of the ELF content upon kernel request. Is there
> anything like this?

libelf provides you with the needed tools for this.

And you didn't answer my question.