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SubjectRe: [RT BUG] Mismatched get_uid/free_uid usage in signals in some rts (2nd try)
On Tue, Jun 21, 2022 at 03:16:39PM +0000, Joe Korty wrote:
> 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,
What does LAG stand for?

FWIW the cherry-pick within the RT-stable tree worked without conflict.
(cherry picked from commit a99e09659e6cd4b633c3689f2c3aa5f8a816fe5b)
It compiles.
See 58a584ee59b2 signal: Prevent double-free of user struct in
linux-stable-rt.git/v4.9-rt-next

>
> fda31c50292a ("signal: avoid double atomic counter increments for user accounting")
>
This was added to 4.9.y on March 20, 2020.
commit 4306259ff6b8b682322d9aeb0c12b27c61c4a548 in linux-stable.

How did you find this issue? What is missing from my testing?

Do you have a test case that I can conferm my cherry-pick works?
Could you test the v4.9-rt-next branch to see if it fixes you issue?

--mark

> 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

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