linux-hardening - Re: [PATCH 6/9] fortify: Split reporting and avoid passing string pointer

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Date:   Fri, 07 Apr 2023 12:49:25 -0700
From:   Kees Cook <kees@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Kees Cook <keescook@...omium.org>
CC:     linux-hardening@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Puyou Lu <puyou.lu@...il.com>, Mark Brown <broonie@...nel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        David Gow <davidgow@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Zhaoyang Huang <zhaoyang.huang@...soc.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Liam Howlett <liam.howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Yury Norov <yury.norov@...il.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Sander Vanheule <sander@...nheule.net>,
        Eric Biggers <ebiggers@...gle.com>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Daniel Latypov <dlatypov@...gle.com>,
        José Expósito <jose.exposito89@...il.com>,
        linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com
Subject: Re: [PATCH 6/9] fortify: Split reporting and avoid passing string pointer

On April 7, 2023 1:34:41 AM PDT, Andy Shevchenko <andy.shevchenko@...il.com> wrote:
>On Fri, Apr 7, 2023 at 1:57 AM Kees Cook <keescook@...omium.org> wrote:
>> On Thu, Apr 06, 2023 at 01:20:52PM +0300, Andy Shevchenko wrote:
>> > On Thu, Apr 6, 2023 at 3:02 AM Kees Cook <keescook@...omium.org> wrote:
>
>...
>
>> > > +       WARN(1, "%s: detected buffer %s overflow\n", name, write ? "write" : "read");
>> >
>> > Using str_read_write() ?
>> >
>> > Dunno if it's already there or needs to be added. I have some patches
>> > to move those str_*() to string_choices.h. We can also prepend yours
>> > with those.
>>
>> Oh! Hah. I totally forgot about str_read_write. :) I will use that.
>
>Btw, makes sense to add
>
>  #define str_write_read(v)    str_read_write(!(v))
>
>to the header, so we won't use negation in the parameter for better readability.

I ended up not going this far because the use of str_read_write() gets removed again in the last patch in the series.



-- 
Kees Cook