linux-kernel - Re: [PATCH v2 1/1] lib/string: Add strscpy

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Message-ID: <CAHp75Vfq5KQupcyx_84YcSOQ8mvNDvFE3R20KdyLEqEz74p3OQ@mail.gmail.com>
Date:   Mon, 25 Feb 2019 10:19:47 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Tobin C. Harding" <tobin@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>, Jann Horn <jannh@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Andy Lutomirski <luto@...capital.net>,
        Daniel Micay <danielmicay@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Shuah Khan <shuah@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/1] lib/string: Add strscpy_pad() function

On Mon, Feb 25, 2019 at 6:17 AM Tobin C. Harding <tobin@...nel.org> wrote:
>
> We have a function to copy strings safely and we have a function to copy
> strings and zero the tail of the destination (if source string is
> shorter than destination buffer) but we do not have a function to do
> both at once.  This means developers must write this themselves if they
> desire this functionality.  This is a chore, and also leaves us open to
> off by one errors unnecessarily.
>
> Add a function that calls strscpy() then memset()s the tail to zero if
> the source string is shorter than the destination buffer.
>
> Add test module for the new code.

> --- /dev/null
> +++ b/lib/test_strscpy.c
> @@ -0,0 +1,175 @@

> +// SPDX-License-Identifier: GPL-2.0

> +MODULE_LICENSE("GPL");

License mismatch.

Do we need a separate module for this test?

-- 
With Best Regards,
Andy Shevchenko