linux-kernel - Re: [PATCH 2/2] [stable-4.9] x86: fix build warnign with 32-bit PAE

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Date:   Wed, 21 Feb 2018 10:36:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Arnd Bergmann <arnd@...db.de>, "# 3.4.x" <stable@...r.kernel.org>,
        X86 ML <x86@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Hugh Dickins <hughd@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] [stable-4.9] x86: fix build warnign with 32-bit PAE

On Thu, Feb 15, 2018 at 09:58:00AM -0800, Kees Cook wrote:
> On Thu, Feb 15, 2018 at 7:16 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > I ran into a 4.9 build warning in randconfig testing, starting with the
> > KAISER patches:
> >
> > arch/x86/kernel/ldt.c: In function 'alloc_ldt_struct':
> > arch/x86/include/asm/pgtable_types.h:208:24: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
> >  #define __PAGE_KERNEL  (__PAGE_KERNEL_EXEC | _PAGE_NX)
> >                         ^
> > arch/x86/kernel/ldt.c:81:6: note: in expansion of macro '__PAGE_KERNEL'
> >       __PAGE_KERNEL);
> >       ^~~~~~~~~~~~~
> >
> > I originally ran into this last year when the patches were part of linux-next,
> > and tried to work around it by using the proper 'pteval_t' types consistently,
> > but that caused additional problems.
> >
> > This takes a much simpler approach, and makes the argument type of the dummy
> > helper always 64-bit, which is wide enough for any page table layout and
> > won't hurt since this call is just an empty stub anyway.
> >
> > Fixes: 8f0baadf2bea ("kaiser: merged update")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> >  include/linux/kaiser.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/include/linux/kaiser.h b/include/linux/kaiser.h
> > index 58c55b1589d0..b56c19010480 100644
> > --- a/include/linux/kaiser.h
> > +++ b/include/linux/kaiser.h
> > @@ -32,7 +32,7 @@ static inline void kaiser_init(void)
> >  {
> >  }
> >  static inline int kaiser_add_mapping(unsigned long addr,
> > -                                    unsigned long size, unsigned long flags)
> > +                                    unsigned long size, u64 flags)
> >  {
> >         return 0;
> >  }
> > --
> > 2.9.0
> >
> 
> Acked-by: Kees Cook <keescook@...omium.org>
> 
> I assume this is needed for 4.4 as well...

Yes, I've added it there too.

greg k-h