linux-kernel - Re: [PATCH] Squashfs: remove deprecated strncpy by not copying the string

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Wed, 3 Apr 2024 14:28:36 -0700
From: Kees Cook <keescook@...omium.org>
To: Phillip Lougher <phillip@...ashfs.org.uk>
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	justinstitt@...gle.com
Subject: Re: [PATCH] Squashfs: remove deprecated strncpy by not copying the
 string

On Wed, Apr 03, 2024 at 07:33:52PM +0100, Phillip Lougher wrote:
> Squashfs copied the passed string (name) into a temporary buffer
> to ensure it was NUL-terminated.  This however is completely
> unnecessary as the string is already NUL-terminated.  So remove
> the deprecated strncpy() by completely removing the string copy.
> 
> The background behind this unnecessary string copy is that it
> dates back to the days when Squashfs was an out of kernel patch.
> The code deliberately did not assume the string was NUL-terminated
> in case in future this changed (due to kernel changes).  This
> would mean the out of tree patches would be broken but still
> compile OK.
> 
> Signed-off-by: Phillip Lougher <phillip@...ashfs.org.uk>

Thanks!

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook