linux-kernel - Re: [PATCH 1/1] file capabilities: simplify signal check

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Message-ID: <20080223153658.GA26634@sergelap.austin.ibm.com>
Date:	Sat, 23 Feb 2008 09:36:58 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morgan <morgan@...nel.org>
Subject: Re: [PATCH 1/1] file capabilities: simplify signal check

Quoting Andrew Morton (akpm@...ux-foundation.org):
> On Wed, 20 Feb 2008 10:15:50 -0600 "Serge E. Hallyn" <serue@...ibm.com> wrote:
> 
> > >From bd076c7245d02be0cc01b7c09bd7170ec5946492 Mon Sep 17 00:00:00 2001
> > From: Serge E. Hallyn <serue@...ibm.com>
> > Date: Sun, 17 Feb 2008 20:28:07 -0500
> > Subject: [PATCH 1/1] file capabilities: simplify signal check
> > 
> > Simplify the uid equivalence check in cap_task_kill().  Anyone
> > can kill a process owned by the same uid.
> > 
> > Without this patch wireshark is reported to fail.
> 
> Strange that a patch titled "simplify...." actually fixes a bug.

Sorry.  Yeah that's a bad subject.

> > Signed-off-by: Serge E. Hallyn <serue@...ibm.com>
> > Signed-off-by: Andrew G. Morgan <morgan@...nel.org>
> > ---
> >  security/commoncap.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/security/commoncap.c b/security/commoncap.c
> > index 5aba826..bb0c095 100644
> > --- a/security/commoncap.c
> > +++ b/security/commoncap.c
> > @@ -552,7 +552,7 @@ int cap_task_kill(struct task_struct *p, struct siginfo *info,
> >  	 * allowed.
> >  	 * We must preserve legacy signal behavior in this case.
> >  	 */
> > -	if (p->euid == 0 && p->uid == current->uid)
> > +	if (p->uid == current->uid)
> >  		return 0;
> >  
> >  	/* sigcont is permitted within same session */
> 
> I've marked this as needed-in-2.6.24.  Was that appropriate?

Yes, thanks.  I doubt wireshark is the only thing that'll break
otherwise.

thanks,
-serge
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