linux-kernel - Re: [patch] signalfd fix for incorrect SI

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Message-ID: <Pine.LNX.4.64.0804101212340.9668@alien.or.mcafeemobile.com>
Date:	Thu, 10 Apr 2008 12:13:22 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mtk.manpages@...glemail.com, stable@...nel.org
Subject: Re: [patch] signalfd fix for incorrect SI_QUEUE user data reporting

On Thu, 10 Apr 2008, Andrew Morton wrote:

> On Thu, 10 Apr 2008 11:57:44 -0700 (PDT)
> Davide Libenzi <davidel@...ilserver.org> wrote:
> 
> > Michael Kerrisk found out that signalfd was not reporting back user data 
> > pushed using sigqueue:
> > 
> > http://groups.google.com/group/linux.kernel/msg/9397cab8551e3123
> > 
> > The following patch makes signalfd to report back the ssi_ptr and ssi_int 
> > members of the signalfd_siginfo structure.
> > 
> > 
> > 
> > Signed-off-by: Davide Libenzi <davidel@...ilserver.org>
> > 
> > 
> > - Davide
> > 
> > 
> > ---
> >  fs/signalfd.c |    7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > Index: linux-2.6.mod/fs/signalfd.c
> > ===================================================================
> > --- linux-2.6.mod.orig/fs/signalfd.c	2008-04-09 11:53:37.000000000 -0700
> > +++ linux-2.6.mod/fs/signalfd.c	2008-04-09 12:05:46.000000000 -0700
> > @@ -111,9 +111,14 @@
> >  		err |= __put_user(kinfo->si_uid, &uinfo->ssi_uid);
> >  		err |= __put_user((long) kinfo->si_ptr, &uinfo->ssi_ptr);
> >  		break;
> > -	default: /* this is just in case for now ... */
> > +	default:
> > +		/*
> > +		 * This case catches also the signals queued by sigqueue().
> > +		 */
> >  		err |= __put_user(kinfo->si_pid, &uinfo->ssi_pid);
> >  		err |= __put_user(kinfo->si_uid, &uinfo->ssi_uid);
> > +		err |= __put_user((long) kinfo->si_ptr, &uinfo->ssi_ptr);
> > +		err |= __put_user(kinfo->si_int, &uinfo->ssi_int);
> >  		break;
> >  	}
> >  
> 
> I queued this for both 2.6.25 and 2.6.24.x.  Agree?

Looks safe for me.



- Davide


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