linux-kernel - Re: [PATCH v7 2/9] seccomp: split filter prep from check and apply

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Message-ID: <20140626123710.GA16204@google.com>
Date:	Thu, 26 Jun 2014 13:37:10 +0100
From:	David Drysdale <drysdale@...gle.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Alexei Starovoitov <ast@...mgrid.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Will Drewry <wad@...omium.org>,
	Julien Tinnes <jln@...omium.org>, linux-api@...r.kernel.org,
	x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mips@...ux-mips.org, linux-arch@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH v7 2/9] seccomp: split filter prep from check and apply

On Mon, Jun 23, 2014 at 02:58:06PM -0700, Kees Cook wrote:
> In preparation for adding seccomp locking, move filter creation away
> from where it is checked and applied. This will allow for locking where
> no memory allocation is happening. The validation, filter attachment,
> and seccomp mode setting can all happen under the future locks.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  kernel/seccomp.c |   97 +++++++++++++++++++++++++++++++++++++-----------------
>  1 file changed, 67 insertions(+), 30 deletions(-)
> 
> diff --git a/kernel/seccomp.c b/kernel/seccomp.c
> index afb916c7e890..edc8c79ed16d 100644
> --- a/kernel/seccomp.c
> +++ b/kernel/seccomp.c
> @@ -515,6 +551,7 @@ static long seccomp_set_mode(unsigned long seccomp_mode, char __user *filter)
>  	current->seccomp.mode = seccomp_mode;
>  	set_thread_flag(TIF_SECCOMP);
>  out:
> +	seccomp_filter_free(prepared);
>  	return ret;
>  }

I think this needs to be inside #ifdef CONFIG_SECCOMP_FILTER to match
the definition of seccomp_filter_free:

../kernel/seccomp.c:554:2: error: implicit declaration of function ‘seccomp_filter_free’ [-Werror=implicit-function-declaration]


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