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

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Message-Id: <20080410120845.8e7132d8.akpm@linux-foundation.org>
Date:	Thu, 10 Apr 2008 12:08:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	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 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?
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