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

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Date:   Sun, 12 Sep 2021 10:25:26 +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 9/9/21 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.
-- 
Rémi Bernon <rbernon@...eweavers.com>