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Date: Tue, 26 Feb 2019 08:31:09 +1100
From: "Tobin C. Harding" <>
To: Andy Shevchenko <>
Cc: "Tobin C. Harding" <>,
	Kees Cook <>, Jann Horn <>,
	Andy Shevchenko <>,
	Randy Dunlap <>,
	Rasmus Villemoes <>,
	Stephen Rothwell <>,
	Andy Lutomirski <>,
	Daniel Micay <>, Arnd Bergmann <>,
	Miguel Ojeda <>,
	"Gustavo A. R. Silva" <>,
	Shuah Khan <>,
	Greg Kroah-Hartman <>,
	Alexander Shishkin <>,
	Kernel Hardening <>,
	Linux Kernel Mailing List <>
Subject: Re: [PATCH v2 1/1] lib/string: Add strscpy_pad() function

On Mon, Feb 25, 2019 at 10:19:47AM +0200, Andy Shevchenko wrote:
> On Mon, Feb 25, 2019 at 6:17 AM Tobin C. Harding <> 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
> License mismatch.

Thanks, will re-spin with 

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

> Do we need a separate module for this test?

Separate as in not in lib/test_string.h?  I intend on moving the test
into that file once I've done some cleanup in tools/testing/selftest/lib/

I also tried to do this without using a module using
tools/testing/selftest/kselftest_harness.h but I could not get the
compiler to see read the patched version of

Related question if you feel like answering it; why are test modules for
lib/ in lib/ and not in tools/testing/?

Very much open to suggestions on current best practices for kernel testing.


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