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

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Message-ID: <VI1PR09MB358214376379A2D6B024A689A0B39@VI1PR09MB3582.eurprd09.prod.outlook.com>
Date:   Tue, 21 Jun 2022 15:16:39 +0000
From:   Joe Korty <Joe.Korty@...current-rt.com>
To:     Mark Gross <markgross@...nel.org>,
        "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Linux RT users <linux-rt-users@...hiver.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [RT BUG] Mismatched get_uid/free_uid usage in signals in some rts
 (2nd try)

Mismatched get_uid/free_uid usage in signals in 4.9.312-rt193

     [  First attempt using mutt did not show up on the mailing lists.
        Trying again with office365 Outlook.   Also added the 4.9-rt
        maintainers. ]

The 4.19-rt patch,

   0329-signal-Prevent-double-free-of-user-struct.patch

needs to be ported to LAG 4.9-rt, as that release now has the Linus commit,

   fda31c50292a ("signal: avoid double atomic counter increments for user accounting")

which breaks the longstanding rt patch,

   0259-signals-Allow-rt-tasks-to-cache-one-sigqueue-struct.patch

Current application status:

   4.4.302-rt232        OK      has both Linus's patch and the fix needed for rt.
   4.9.312-rt193        BROKE   has Linus's patch but not the fix.
   4.14.87-rt50         OK      does NOT have either Linus's patch nor its rt fix.
   4.19.246-rt110       OK      has both Linus's patch and the fix needed for rt.
   5.4.193-rt74         OK	has both Linus's patch and the fix needed for rt.
   5.10.120-rt70        OK	has both Linus's patch and the fix needed for rt.
   5.15.44-rt46         UNKNOWN no get_uid/free_uid usage in kernel/signal.c anymore.

Regards,
Joe