linux-kernel - Re: [PATCH v3] seccomp: add ptrace options for suspend/resume

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Message-ID: <20150605234800.GA31991@redhat.com>
Date:	Sat, 6 Jun 2015 01:48:00 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tycho Andersen <tycho.andersen@...onical.com>
Cc:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	Roland McGrath <roland@...k.frob.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
Subject: Re: [PATCH v3] seccomp: add ptrace options for suspend/resume

On 06/05, Tycho Andersen wrote:
>
> right thing to do, just leave out the definition of
> may_suspend_seccomp all together, or add in another if defined() in
> the header?

Just declare it unconditionally in .h. The kernel relies on this kind
of dead-code elimination anyway. For example, please look at
"extern void __put_user_bad(void)" in uaccess.h.

IOW,

	extern void undefined_func(void);

	if (0)
		undefined_func();

should be safe.

> Maybe we will get rid of this pesky function all together though...

Yes ;)

Oleg.

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