linux-kernel - Re: Extending coredump note section to contain filenames

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Message-ID: <20120313121914.GA2957@host2.jankratochvil.net>
Date:	Tue, 13 Mar 2012 13:19:14 +0100
From:	Jan Kratochvil <jan.kratochvil@...hat.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Roland McGrath <roland@...k.frob.com>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
	Kushal Das <kdas@...hat.com>
Subject: Re: Extending coredump note section to contain filenames

On Tue, 13 Mar 2012 13:12:41 +0100, Denys Vlasenko wrote:
> ec1fd70dbee0db36eff9527254d9d2bbfd260f13 0x2093 - /usr/bin/md5sum
> ec1fd70dbee0db36eff9527254d9d2bbfd260f13 0x1659 - /usr/bin/md5sum
> 
> If anyone would want to use this tool on a large collection
> of coredumps with the intent of fishing out similar crashes

In such moment it is already on public Internet and the build-id -> name
mapping database is available.

Or it rather would be available if the Darkserver would be finished.  So far
I have only always seen every project for build-id targeted at getting rid of
the build-id and map it back to the ambiguous filenames / package names.

In such case there could filename / package name already in the ELF header.
build-id should be there as a feature, not as a complication.

> (this is not a theoretical assumption, we *do* have people
> who badly need this feature), they won't get nice names of binaries,

If someone does 'cp /usr/bin/md5sum ~/bin/mysum' then you either get
unidentifiable names or even misleading names.

Regards,
Jan
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