linux-kernel - Re: Can we drop upstream Linux x32 support?

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Message-ID: <20181213095724.f4ziawroveksd35t@angband.pl>
Date:   Thu, 13 Dec 2018 10:57:24 +0100
From:   Adam Borowski <kilobyte@...band.pl>
To:     Sven Hartrumpf <hartrumpf@....net>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Can we drop upstream Linux x32 support?

On Thu, Dec 13, 2018 at 10:37:31AM +0100, Sven Hartrumpf wrote:
> Will the proposed patch ("only") remove the possibility to build x32 kernels
> or will it make impossible to compile and run any x32 binaries?

There's no such thing as x32 kernels.  It's an ABI atop amd64 kernels; the
kernel is always 64-bit -- short pointers apply only to userspace and
syscalls.

It could be interesting to block regular amd64 syscalls and leave x32 only
-- for "security through rarity", but the kernel itself would still look the
same.

Meow!
-- 
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