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Date: Fri, 22 Mar 2024 17:08:28 +0100
From: Florian Weimer <fweimer@...hat.com>
To: Sevan Janiyan <venture37@...klan.co.uk>
Cc: libc-coord@...ts.openwall.com
Subject: Re: Elf_GNU_Hash_Header
* Sevan Janiyan:
> On 22/03/2024 02:52, Brooks Davis wrote:
>> It was added it 2009 by the author of elftoolchain which is its only
>> consumer AFACT. If no one else has added I doubt there is much demand
>> for it and it's probably a mistake that it's in sys/elf_common.h.
>
> http://www.linker-aliens.org/blogs/ali/entry/gnu_hash_elf_sections/
>
> elftoolchain author:
>
> On 22/03/2024 13:44, Joseph Koshy wrote:
>>> } Elf_GNU_Hash_Header;
>> IIRC this is a GNU extension to the ELF file format that we started
>> supporting in 2009:
>>
>> https://sourceware.org/legacy-ml/binutils/2006-10/msg00377.html
>>
>> I haven't checked if the extension is still in use. It is probably
>> still in use (in some form), since it was created to address a
>> shortcoming of ELF at that time.
We still use DT_GNU_HASH on GNU/Linux. Most Linux distributions
disabled DT_HASH generation and switched to DT_GNU_HASH exclusively
(except for glibc). This means that for GNU/Linux, DT_GNU_HASH support
is de facto mandatory, and has been for many, many years.
Thanks,
Florian
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