linux-kernel - Re: [PATCH v2 2/2] firmware_loader: fix soundness issue in `request

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Message-ID: <ZoxOHxHze2ynJS-q@bombadil.infradead.org>
Date: Mon, 8 Jul 2024 13:37:51 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: Danilo Krummrich <dakr@...hat.com>
Cc: russ.weight@...ux.dev, gregkh@...uxfoundation.org,
	chrisi.schrefl@...il.com, linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org, Gary Guo <gary@...yguo.net>
Subject: Re: [PATCH v2 2/2] firmware_loader: fix soundness issue in
 `request_internal`

On Mon, Jul 08, 2024 at 10:07:21PM +0200, Danilo Krummrich wrote:
> `request_internal` must be called with one of the following function
> pointers: request_firmware(), firmware_request_nowarn(),
> firmware_request_platform() or request_firmware_direct().
> 
> The previous `FwFunc` alias did not guarantee this, which is unsound.
> 
> In order to fix this up, implement `FwFunc` as new type with a
> corresponding type invariant.
> 
> Reported-by: Gary Guo <gary@...yguo.net>
> Closes: https://lore.kernel.org/lkml/20240620143611.7995e0bb@eugeo/
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>

While you're at it, can you go ahead and extend out selftest coverage
for the firmware_loader so we can test Rust too? Could these issues
have been caught with a selftest? If not why not?

  Luis