linux-hardening - Re: [PATCH v2] string: Introduce strtomem() and strtomem

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Message-ID: <202209021351.13203B669@keescook>
Date:   Fri, 2 Sep 2022 13:52:35 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Len Baker <len.baker@....com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Francis Laniel <laniel_francis@...vacyrequired.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] string: Introduce strtomem() and strtomem_pad()

On Thu, Sep 01, 2022 at 12:34:34PM -0700, Guenter Roeck wrote:
> On 9/1/22 12:09, Kees Cook wrote:
> > [...]
> > -If a caller is using non-NUL-terminated strings, strncpy() can
> > -still be used, but destinations should be marked with the `__nonstring
> > +If a caller is using non-NUL-terminated strings, strtomem() should be
> > +be used, and the destinations should be marked with the `__nonstring
> 
> s/be //

Thanks!

> > [...]
> > +++ b/include/linux/fortify-string.h
> > @@ -77,6 +77,36 @@ extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size)
> >   #define POS	__pass_object_size(1)
> >   #define POS0	__pass_object_size(0)
> > +/** strncpy - Copy a string to memory with non-guaranteed NUL padding
> 
> Does that need a newline before strncpy() ?

What do you mean here? I think this is valid kerndoc, but I'll
double-check. (And will continue in the neighboring htmldoc build thread.)

-Kees

-- 
Kees Cook