linux-kernel - Re: [PATCH v3] lib/string.c: implement stpcpy

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]

Message-ID: <CAKwvOd=YrVtPsB7HYPO0N=K7QJm9KstayqqeYQERSaGtGy2Bjg@mail.gmail.com>
Date:   Wed, 26 Aug 2020 09:58:01 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        stable <stable@...r.kernel.org>, Andy Lavr <andy.lavr@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Yury Norov <yury.norov@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] lib/string.c: implement stpcpy

On Wed, Aug 26, 2020 at 9:57 AM Joe Perches <joe@...ches.com> wrote:
>
> On Thu, 2020-08-27 at 01:49 +0900, Masahiro Yamada wrote:
> > I do not have time to keep track of the discussion fully,
> > but could you give me a little more context why
> > the usage of stpcpy() is not recommended ?
> >
> > The implementation of strcpy() is almost the same.
> > It is unclear to me what makes stpcpy() unsafe..

https://lore.kernel.org/lkml/202008150921.B70721A359@keescook/

>
> It's the same thing that makes strcpy unsafe:
>
> Unchecked buffer lengths with no guarantee src is terminated.

-- 
Thanks,
~Nick Desaulniers