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

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Date:   Fri, 2 Sep 2022 15:37:19 -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 Fri, Sep 02, 2022 at 02:47:04PM -0700, Guenter Roeck wrote:
> On Fri, Sep 02, 2022 at 01:52:35PM -0700, Kees Cook wrote:
> > 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.)
> > 
> 
> Just asking. "/** strncpy - Copy a string ..." seemed unusual without
> newline between "/**" and the function name.

Oops, yes. Thank you again!

-- 
Kees Cook