linux-kernel - Re: [kernel-hardening] Re: [PATCH 1/2] sysctl: expand use of proc_dointvec_minmax

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Date:	Sun, 24 Jan 2016 01:43:42 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Jann Horn <jann@...jh.net>, kernel-hardening@...ts.openwall.com,
	Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Weinberger <richard@....at>,
	Andy Lutomirski <luto@...capital.net>,
	Robert Święcki <robert@...ecki.net>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	David Howells <dhowells@...hat.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [kernel-hardening] Re: [PATCH 1/2] sysctl: expand use of
 proc_dointvec_minmax_sysadmin

On Sat, Jan 23, 2016 at 07:20:17PM -0600, Eric W. Biederman wrote:

> Yep.  That is about the size of it.  file * used to be passed to the
> sysctl methods but it was removed several years ago because no one was
> using it.

Generally cred would be better...  Alternatively we could eat one more
pointer in task_struct and stash a reference to that sucker there, rather
than adding an explicit argument (again, with cred instead of file).
Not sure...