linux-kernel - Re: [RE-RESEND][PATCH] audit: replace defines with C stubs

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Date:	Thu, 13 Sep 2012 21:43:16 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Kees Cook <keescook@...omium.org>, Jonas Bonn <jonas@...thpole.se>
Cc:	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Eric Paris <eparis@...hat.com>, linux@...ts.openrisc.net,
	Linux-Next <linux-next@...r.kernel.org>
Subject: Re: [RE-RESEND][PATCH] audit: replace defines with C stubs

On Tue, Aug 7, 2012 at 2:40 AM, Kees Cook <keescook@...omium.org> wrote:
> This replaces the #defines used when CONFIG_AUDIT or CONFIG_AUDIT_SYSCALLS
> are disabled so we get type checking during those builds.
>
> Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Kees Cook <keescook@...omium.org>

JFYI, the change

-#define audit_syscall_entry(ta,a,b,c,d,e) do { ; } while (0)
+static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
+                                      unsigned long a1, unsigned long a2,
+                                      unsigned long a3)
+{ }

uncovers a bug on OpenRISC.

Before,

        audit_syscall_entry(audit_arch(), regs->gpr[11],
                            regs->gpr[3], regs->gpr[4],
                            regs->gpr[5], regs->gpr[6]);

just expanded to nothing if CONFIG_AUDITSYSCALL was not set.
Now, it fails to compile with:

arch/openrisc/kernel/ptrace.c:190:2: error: implicit declaration of
function 'audit_arch'
http://kisskb.ellerman.id.au/kisskb/buildresult/7191698/

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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
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