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

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Message-ID: <CAGXu5jJx85b2ysgx2aXWUUf4dJMc34Cukp3S1VKiC_Pc5U2+Pw@mail.gmail.com>
Date:	Tue, 27 Mar 2012 10:29:39 -0700
From:	Kees Cook <keescook@...gle.com>
To:	"Ted Ts'o" <tytso@....edu>, Kees Cook <keescook@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Correct way to include siginfo.h?

On Tue, Mar 27, 2012 at 10:21 AM, Ted Ts'o <tytso@....edu> wrote:
> On Tue, Mar 27, 2012 at 10:01:10AM -0700, Kees Cook wrote:
>>
>> Does anyone know the right way to include siginfo.h when building
>> userspace tools that need it?
>
> What fields or structures are you trying to get at?  I haven't needed
> to include siginfo.h explicitly even though this file pokes and prods
> pretty thoroughly at the siginfo structures:

I'm trying to get at the future seccomp fields on siginfo_t, namely
"si_syscall":

static void reporter(int nr, siginfo_t *info, void *void_context)
{
...
    syscall = info->si_syscall;

> http://git.kernel.org/?p=fs/ext2/e2fsprogs.git;a=blob;f=e2fsck/sigcatcher.c;h=10b93287d5b2b4da1fb43d34fafd848d06c01645;hb=5f7c04972fefa8198c34f231a9e8a5430705b4ab
>
> The sigcatcher.c file is a debugging tool for e2fsprogs that prints
> pretty much everything that is available to userspace, as far as I
> know...

Yeah, it looks like you're leaning on glibc's signal.h (and its
bits/signal.h file), which has its own siginfo definition rather than
attempting to include one from the kernel.

-Kees

-- 
Kees Cook
Chrome OS Security
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