linux-kernel - Re: [PATCH 0/4] livepatch/samples/selftest: Clean up show variables handling

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Date:   Thu, 16 Jan 2020 14:29:35 -0500
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Petr Mladek <pmladek@...e.com>, Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>
Cc:     Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Nicolai Stange <nstange@...e.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] livepatch/samples/selftest: Clean up show variables
 handling

On 1/16/20 10:31 AM, Petr Mladek wrote:
> Dan Carpenter reported suspicious allocations of shadow variables
> in the sample module, see
> https://lkml.kernel.org/r/20200107132929.ficffmrm5ntpzcqa@kili.mountain
> 
> The code did not cause a real problem. But it was indeed misleading
> and semantically wrong. I got confused several times when cleaning it.
> So I decided to split the change into few steps. I hope that
> it will help reviewers and future readers.
> 
> The changes of the sample module are basically the same as in the RFC.
> In addition, there is a clean up of the module used by the selftest.
> 
> 
> Petr Mladek (4):
>    livepatch/sample: Use the right type for the leaking data pointer
>    livepatch/selftest: Clean up shadow variable names and type
>    livepatch/samples/selftest: Use klp_shadow_alloc() API correctly
>    livepatch: Handle allocation failure in the sample of shadow variable
>      API
> 
>   lib/livepatch/test_klp_shadow_vars.c      | 119 +++++++++++++++++-------------
>   samples/livepatch/livepatch-shadow-fix1.c |  39 ++++++----
>   samples/livepatch/livepatch-shadow-fix2.c |   4 +-
>   samples/livepatch/livepatch-shadow-mod.c  |   4 +-
>   4 files changed, 99 insertions(+), 67 deletions(-)
> 

Hi Petr,

These are good cleanups, thanks for the fixes and tidying up all the 
pointer/value indirections.

Reviewed-by: Joe Lawrence <joe.lawrence@...hat.com>

-- Joe