linux-kernel - Re: [PATCH] perf symbol: Look for ImageBase in PE file to compute .text offset

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Message-ID: <bca46af1-e2b8-a92b-c796-86d21bfecec6@codeweavers.com>
Date:   Mon, 13 Sep 2021 22:37:47 +0200
From:   Rémi Bernon <rbernon@...eweavers.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf symbol: Look for ImageBase in PE file to compute
 .text offset

On 9/13/21 9:24 PM, Arnaldo Carvalho de Melo wrote:
> Em Sun, Sep 12, 2021 at 10:25:26AM +0200, Rémi Bernon escreveu:
>> On 9/9/21 10:27 PM, Arnaldo Carvalho de Melo wrote:
>>> Em Thu, Sep 09, 2021 at 09:26:36PM +0200, Remi Bernon escreveu:
>>>> Instead of using the file offset in the debug file.
>>>>
>>>> This fixes a regression from 00a3423492bc90be99e529a64f13fdd80a0e8c0a,
>>>> causing incorrect symbol resolution when debug file have been stripped
>>>> from non-debug sections (in which case its .text section is empty and
>>>> doesn't have any file position).
>>>>
>>>> The debug files could also be created with a different file alignment,
>>>> and have different file positions from the mmap-ed binary, or have the
>>>> section reordered.
>>>>
>>>> This instead looks for the file image base, using the corresponding bfd
>>>> *ABS* symbols. As PE symbols only have 4 bytes, it also needs to keep
>>>> .text section vma high bits.
>>>
>>> I added a:
>>>
>>> Fixes: 00a3423492bc90be ("perf symbols: Make dso__load_bfd_symbols() load PE files from debug cache only")
>>>
>>> To help stable@...nel.org to pick it, its on my local tree now.
>>>
>>> It would be great to get a:
>>>
>>> Reviewed-by: Nicholas Fraser <nfraser@...eweavers.com>
>>>
>>> Can we have it, please?
>>>
>>
>> Well, Nicholas doesn't work with us anymore. I've reached them separately
>> but didn't get any answer so I'm thinking they may not be interested.
> 
> No problem, its already upstream now.
> 
> Thanks,
> 
> - Arnaldo
> 

Awesome, thanks!
-- 
Rémi Bernon <rbernon@...eweavers.com>