linux-kernel - Re: [GIT PULL] audit patches

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Date:	Wed, 21 Feb 2007 16:03:19 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Al Viro <viro@....linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Steve Grubb <sgrubb@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>
Subject: Re: [GIT PULL] audit patches

On Sun, 18 Feb 2007 04:01:27 +0000 Al Viro <viro@....linux.org.uk> wrote:

> Misc audit patches (resend again...); the most intrusive one is AUDIT_FD_PAIR,
> allowing to log descriptor numbers from syscalls that do not return them in
> usual way (i.e. pipe() and socketpair()).  It took some massage of
> the failure exits in sys_socketpair(); the rest is absolutely trivial.
> Please, pull from
> git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current.git/ audit.b37

Please send patches to the list for review if practical?  In this case it
was.  I trust davem has had a look at the non-trivial changes to
sys_socketpair().

Looking at the changes to audit_receive_msg():

				if (sid) {
					if (selinux_sid_to_string(
							sid, &ctx, &len)) {
						audit_log_format(ab,
							" ssid=%u", sid);
						/* Maybe call audit_panic? */
					} else
						audit_log_format(ab,
							" subj=%s", ctx);
					kfree(ctx);
				}

This is assuming that selinux_sid_to_string() always initialises `ctx'.

But AFAICT there are two error paths in security_sid_to_context() which
forget to do that, so we end up doing kfree(uninitialised-local).

I'd consider that a shortcoming in security_sid_to_context(), so not a
problem in this patch, as long as people agree with my blaming above.

The coding style in there is a bit odd-looking.

The new __audit_fd_pair() has unneeded braces in it.
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