* STABLE REQUEST: perf/core: Avoid put_page() when GUP fails
@ 2021-11-15 17:39 Greg Thelen
2021-11-19 14:31 ` Greg KH
0 siblings, 1 reply; 3+ messages in thread
From: Greg Thelen @ 2021-11-15 17:39 UTC (permalink / raw)
To: stable
Cc: Peter Zijlstra, Andi Kleen, Kan Liang, Stephane Eranian, Pasha Tatashin
The patch titled ("perf/core: Avoid put_page() when GUP fails") has been
merged into linus/master as commit
4716023a8f6a0f4a28047f14dd7ebdc319606b84.
The patch fixes an issue present in all v4.14+ kernels that can cause
page reference count underflow, which can lead to unintentional page
sharing.
The patch did not have cc: stable footer, so I'm manually requesting
-stable inclusion into v4.14+.
There are some trivial conflicts in older kernels. I'd be happy to
review/test, if that's useful.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: STABLE REQUEST: perf/core: Avoid put_page() when GUP fails
2021-11-15 17:39 STABLE REQUEST: perf/core: Avoid put_page() when GUP fails Greg Thelen
@ 2021-11-19 14:31 ` Greg KH
2021-11-22 17:23 ` Greg Thelen
0 siblings, 1 reply; 3+ messages in thread
From: Greg KH @ 2021-11-19 14:31 UTC (permalink / raw)
To: Greg Thelen
Cc: stable, Peter Zijlstra, Andi Kleen, Kan Liang, Stephane Eranian,
Pasha Tatashin
On Mon, Nov 15, 2021 at 09:39:53AM -0800, Greg Thelen wrote:
> The patch titled ("perf/core: Avoid put_page() when GUP fails") has been
> merged into linus/master as commit
> 4716023a8f6a0f4a28047f14dd7ebdc319606b84.
>
> The patch fixes an issue present in all v4.14+ kernels that can cause
> page reference count underflow, which can lead to unintentional page
> sharing.
>
> The patch did not have cc: stable footer, so I'm manually requesting
> -stable inclusion into v4.14+.
>
> There are some trivial conflicts in older kernels. I'd be happy to
> review/test, if that's useful.
Please provide working versions for 4.14, 4.19, and 5.4. The others
kernels applied just fine.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: STABLE REQUEST: perf/core: Avoid put_page() when GUP fails
2021-11-19 14:31 ` Greg KH
@ 2021-11-22 17:23 ` Greg Thelen
0 siblings, 0 replies; 3+ messages in thread
From: Greg Thelen @ 2021-11-22 17:23 UTC (permalink / raw)
To: Greg KH
Cc: stable, Peter Zijlstra, Andi Kleen, Kan Liang, Stephane Eranian,
Pasha Tatashin
Greg KH <gregkh@linuxfoundation.org> wrote:
> On Mon, Nov 15, 2021 at 09:39:53AM -0800, Greg Thelen wrote:
>> The patch titled ("perf/core: Avoid put_page() when GUP fails") has been
>> merged into linus/master as commit
>> 4716023a8f6a0f4a28047f14dd7ebdc319606b84.
>>
>> The patch fixes an issue present in all v4.14+ kernels that can cause
>> page reference count underflow, which can lead to unintentional page
>> sharing.
>>
>> The patch did not have cc: stable footer, so I'm manually requesting
>> -stable inclusion into v4.14+.
>>
>> There are some trivial conflicts in older kernels. I'd be happy to
>> review/test, if that's useful.
>
> Please provide working versions for 4.14, 4.19, and 5.4. The others
> kernels applied just fine.
>
> thanks,
>
> greg k-h
Done. Backported and tested on stable 4.14-y, 4.19-y, and 5.4-y:
https://lore.kernel.org/stable/20211122171825.1582436-1-gthelen@google.com/
https://lore.kernel.org/stable/20211122171824.1582407-1-gthelen@google.com/
https://lore.kernel.org/stable/20211122171818.1582357-1-gthelen@google.com/
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-11-22 17:23 UTC | newest]
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2021-11-15 17:39 STABLE REQUEST: perf/core: Avoid put_page() when GUP fails Greg Thelen
2021-11-19 14:31 ` Greg KH
2021-11-22 17:23 ` Greg Thelen
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