linux-hardening - Re: [RFC PATCH v4 4/5] Add new file in LKDTM to test fortified strscpy.

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Message-ID: <202011171404.5E0F44C@keescook>
Date:   Tue, 17 Nov 2020 14:04:02 -0800
From:   Kees Cook <keescook@...omium.org>
To:     laniel_francis@...vacyrequired.com
Cc:     linux-hardening@...r.kernel.org, dja@...ens.net
Subject: Re: [RFC PATCH v4 4/5] Add new file in LKDTM to test fortified
 strscpy.

On Mon, Nov 16, 2020 at 03:50:11PM +0100, laniel_francis@...vacyrequired.com wrote:
> From: Francis Laniel <laniel_francis@...vacyrequired.com>
> 
> This new test ensures that fortified strscpy has the same behavior than vanilla
> strscpy (e.g. returning -E2BIG when src content is truncated).
> Finally, it generates a crash at runtime because there is a write overflow in
> destination string.
> 
> Signed-off-by: Francis Laniel <laniel_francis@...vacyrequired.com>

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

-- 
Kees Cook