linux-kernel - Re: [PATCH v2] module: Don't ignore errors from set_memory

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Message-ID: <Zc-0vEqOvjnai8Dp@bombadil.infradead.org>
Date: Fri, 16 Feb 2024 11:17:16 -0800
From: Luis Chamberlain <mcgrof@...nel.org>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kees Cook <keescook@...omium.org>,
	"linux-hardening @ vger . kernel . org" <linux-hardening@...r.kernel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2] module: Don't ignore errors from set_memory_XX()

On Fri, Feb 16, 2024 at 09:14:27AM +0100, Christophe Leroy wrote:
> set_memory_ro(), set_memory_nx(), set_memory_x() and other helpers
> can fail and return an error. In that case the memory might not be
> protected as expected and the module loading has to be aborted to
> avoid security issues.
> 
> Check return value of all calls to set_memory_XX() and handle
> error if any.
> 
> Add a check to not call set_memory_XX() on NULL pointers as some
> architectures may not like it allthough numpages is always 0 in that
> case. This also avoid a useless call to set_vm_flush_reset_perms().
> 
> Link: https://github.com/KSPP/linux/issues/7
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>

Applied and pushed, thanks!

  Luis