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

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Message-ID: <TYCPR01MB69938E7E2E14697FCF166155E5AD9@TYCPR01MB6993.jpnprd01.prod.outlook.com>
Date:   Wed, 1 Mar 2023 03:12:08 +0000
From:   "Tomohiro Misono (Fujitsu)" <misono.tomohiro@...itsu.com>
To:     "'madvenka@...ux.microsoft.com'" <madvenka@...ux.microsoft.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

<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).

[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.
>