linux-hardening - Re: [PATCH 0/3] kernfs: Convert from strlcpy() to strscpy()

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Date: Mon, 27 Nov 2023 13:43:57 +0000
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Kees Cook <keescook@...omium.org>
Cc: Tejun Heo <tj@...nel.org>, Azeem Shaikh <azeemshaikh38@...il.com>,
	Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Waiman Long <longman@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, bpf@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH 0/3] kernfs: Convert from strlcpy() to strscpy()

On Thu, Nov 16, 2023 at 11:21:22AM -0800, Kees Cook wrote:
> Hi,
> 
> One of the last users of strlcpy() is kernfs, which has some complex
> calling hierarchies that needed to be carefully examined. This series
> refactors the strlcpy() calls into strscpy() calls, and bubbles up all
> changes in return value checking for callers.

Why not work instead to convert kernfs (and by proxy cgroups) to use the
"safe" string functions based on seq_file?  This should be a simpler
patch series to review, and implement on a per-function basis, and then
we would not have any string functions in kernfs anymore.

thanks,

greg k-h