linux-kernel - Re: [PATCH 0/6] lib: Add safe string funtions

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Message-ID: <CAGXu5j+gHMCjxMr3k0UNBcsT6DYuALtpROxazf7YVX=SUja_cQ@mail.gmail.com>
Date:   Wed, 20 Feb 2019 15:31:07 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Tobin C. Harding" <tobin@...nel.org>
Cc:     Shuah Khan <shuah@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/6] lib: Add safe string funtions

On Mon, Feb 18, 2019 at 3:24 PM Tobin C. Harding <tobin@...nel.org> wrote:
> During your talk at LCA you mentioned that we could do with a couple
> more safe string functions.  One to zero the tail of the destination
> buffer after call to strscpy() and also the self explanatory
> strscpy_from_user().

Thanks for jumping in with this! :)

> I couldn't work out if this is a false positive or not?  Does the new
> config option CONFIG_TEST_STRING need more documentation?  I don't see
> where extra docs should be added and it seems self explanatory as is.

Usually this just means the help string in Kconfig is "too short".
Sometimes this is a false positive -- really up to you if you think it
needs more. :)

On to individual patches...

-- 
Kees Cook