linux-kernel - Re: Correct way to include siginfo.h?

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Message-ID: <CAGXu5jKaHygqzfbtahSBCM=EQmqkS8br5ndnLp0QCRFaka11SA@mail.gmail.com>
Date:	Thu, 29 Mar 2012 11:13:23 -0700
From:	Kees Cook <keescook@...gle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Ted Ts'o" <tytso@....edu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Correct way to include siginfo.h?

On Thu, Mar 29, 2012 at 10:58 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 03/27/2012 11:01 AM, Kees Cook wrote:
>>
>> No, siginfo, IIUC, is defined to be SI_MAX_SIZE bytes. The union for
>> seccomp (on SIGSYS) just uses a long and 2 ints. It'd be nice for
>> there to be a stable way to get the kernel's siginfo instead of
>> glibc's.
>>
>
> Make it safe for the kernel to export and make glibc use the kernel's
> version, just like everything else...

We'll have to poke the glibc folks. In the meantime, Will Drewry found
a stable way to handle this. Just make the first set of includes and
defines be:

#include <asm/siginfo.h>
#define __have_siginfo_t 1
#define __have_sigval_t 1
#define __have_sigevent_t 1

Then the glibc includes won't attempt the redefinition.

-Kees

-- 
Kees Cook
Chrome OS Security
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