linux-hardening - Re: [PATCH] PM: hibernate: replace deprecated strncpy with strscpy

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Date: Tue, 30 Apr 2024 15:06:25 +0530
From: Dhruva Gole <d-gole@...com>
To: Justin Stitt <justinstitt@...gle.com>
CC: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <len.brown@...el.com>,
        Pavel Machek <pavel@....cz>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] PM: hibernate: replace deprecated strncpy with strscpy

On Apr 29, 2024 at 20:50:30 +0000, Justin Stitt wrote:
> strncpy() is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
> 
> This kernel config option is simply assigned with the resume_file
> buffer. It should be NUL-terminated but not necessarily NUL-padded as
> per its further usage with other string apis:
> |	static int __init find_resume_device(void)
> |	{
> |		if (!strlen(resume_file))
> |			return -ENOENT;
> |
> |		pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
> 
> Use strscpy [2] as it guarantees NUL-termination on the destination
> buffer. Specifically, use the new 2-argument version of strscpy()
> introduced in Commit e6584c3964f2f ("string: Allow 2-argument
> strscpy()").
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
> ---
[...]

Reviewed-by: Dhruva Gole <d-gole@...com>

-- 
Best regards,
Dhruva Gole <d-gole@...com>