lkml.org 
[lkml]   [2017]   [Sep]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH 7/7] include/linux/string.h: add the option of fortified string.h functions
Hi Kees, Daniel,

On Mon, Jun 19, 2017 at 10:26 PM, Kees Cook <keescook@chromium.org> wrote:
> From: Daniel Micay <danielmicay@gmail.com>
>
> This adds support for compiling with a rough equivalent to the glibc
> _FORTIFY_SOURCE=1 feature, providing compile-time and runtime buffer
> overflow checks for string.h functions when the compiler determines the
> size of the source or destination buffer at compile-time. Unlike glibc,
> it covers buffer reads in addition to writes.

[...]

> Link: http://lkml.kernel.org/r/20170526095404.20439-1-danielmicay@gmail.com
> Signed-off-by: Daniel Micay <danielmicay@gmail.com>
> Acked-by: Kees Cook <keescook@chromium.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Daniel Axtens <dja@axtens.net>
> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Chris Metcalf <cmetcalf@ezchip.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: Ingo Molnar <mingo@elte.hu>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> [kees: move from -mm, add ARCH_HAS_FORTIFY_SOURCE, tweak Kconfig help]
> Signed-off-by: Kees Cook <keescook@chromium.org>

This is now commit 6974f0c4555e285a upstream.

> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -187,4 +187,204 @@ static inline const char *kbasename(const char *path)
> return tail ? tail + 1 : path;
> }
>
> +#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline))

With gcc-4.1.2, I now get zillions of:

include/linux/string.h:439: warning: ‘gnu_inline’ attribute
directive ignored

This attribute seems to be supported as of gcc 4.2?

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

\
 
 \ /
  Last update: 2017-09-10 12:56    [W:0.065 / U:3.996 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site