linux-kernel - Re: [RFC PATCH v3 00/22] arm64: livepatch: Use ORC for dynamic frame pointer validation

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Date:   Mon, 6 Mar 2023 10:57:00 -0600
From:   "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>
To:     "Tomohiro Misono (Fujitsu)" <misono.tomohiro@...itsu.com>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "chenzhongjin@...wei.com" <chenzhongjin@...wei.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "Keiya Nobuta (Fujitsu)" <nobuta.keiya@...itsu.com>,
        "sjitindarsingh@...il.com" <sjitindarsingh@...il.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "jamorris@...ux.microsoft.com" <jamorris@...ux.microsoft.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v3 00/22] arm64: livepatch: Use ORC for dynamic frame
 pointer validation



On 2/28/23 21:12, Tomohiro Misono (Fujitsu) wrote:
> <snip>
>> Testing
>> =======
>>
>> - I have run all of the livepatch selftests successfully. I have written a
>>   couple of extra selftests myself which I will be posting separately
> Hi,
> 
> What test configuration/environment you are using for test?
> When I tried kselftest with fedora based config on VM, I got errors
> because livepatch transition won't finish until signal is sent
> (i.e. it takes 15s for every transition).
> 

Sorry for not responding earlier. I was out sick.

I tested on a bare metal system (thunderx) running Ubuntu. I will try to reproduce
the error you are seeing on a VM running fedora.

Madhavan

> [excerpt from test result]
>   ```
>   $ sudo ./test-livepatch.sh
>   TEST: basic function patching ... not ok
>   
>   --- expected
>   +++ result
>   @@ -2,11 +2,13 @@
>    livepatch: enabling patch 'test_klp_livepatch'
>    livepatch: 'test_klp_livepatch': initializing patching transition
>    livepatch: 'test_klp_livepatch': starting patching transition
>   +livepatch: signaling remaining tasks
>    livepatch: 'test_klp_livepatch': completing patching transition
>   ```
> 
> Thanks,
> Tomohiro
> 
>>
>> - I have a test driver to induce a NULL pointer exception to make sure
>>   that unwinding through exception handlers is reliable.
>>
>> - I use the test driver to create a timer to make sure that unwinding through
>>   the timer IRQ is reliable.
>>
>> - I call the unwinder from different places during boot to make sure that
>>   the unwinding in each of those cases is reliable.
>>