linux-kernel - Re: [RT BUG] Mismatched get_uid/free_uid usage in signals in some rts (2nd try)

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Message-ID: <Yv5j8NQ72KXu60nL@linutronix.de>
Date:   Thu, 18 Aug 2022 18:08:16 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Joe Korty <joe.korty@...current-rt.com>
Cc:     Mark Gross <markgross@...nel.org>,
        "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux RT users <linux-rt-users@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RT BUG] Mismatched get_uid/free_uid usage in signals in some
 rts (2nd try)

On 2022-06-26 08:30:19 [-0400], Joe Korty wrote:
> Hi Mark,
> Absent an actual test of your port of a99e09659e6c to 4.9-rt, I just
> eye-verified that the change it makes to sigqueue_free_current looks
> correct.  In detail,
> 
>   matches the same change the Linus patch makes to __sigqueue_free (ie,
>   to the routine that sigqueue_free_current is a copy of).
> 
>   That the new variable 'up', in sigqueue_free_current, is being used
>   in the patch (some variants of this fix do not have 'up'), and that
>   variable is present in 4.9's version of sigqueue_free_current.
>   
>   That atomic_dec_and_test, rather than the refcounting version of that
>   some function, is being used (some versions of this patch are refcounted
>   instead).

What is the status here? Is this still needed?

> Regards,
> Joe

Sebastian