linux-kernel - Re: [tip: x86/shstk] x86/shstk: Enable shadow stacks for x32

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Message-ID: <20240322164912.GAZf22iBdqdkIFcrsl@fat_crate.local>
Date: Fri, 22 Mar 2024 17:49:12 +0100
From: Borislav Petkov <bp@...en8.de>
To: linux-kernel@...r.kernel.org
Cc: linux-tip-commits@...r.kernel.org, "H.J. Lu" <hjl.tools@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>, x86@...nel.org
Subject: Re: [tip: x86/shstk] x86/shstk: Enable shadow stacks for x32

On Fri, Mar 22, 2024 at 10:59:58AM -0000, tip-bot2 for H.J. Lu wrote:
> The following commit has been merged into the x86/shstk branch of tip:
> 
> Commit-ID:     2883f01ec37dd8668e7222dfdb5980c86fdfe277
> Gitweb:        https://git.kernel.org/tip/2883f01ec37dd8668e7222dfdb5980c86fdfe277
> Author:        H.J. Lu <hjl.tools@...il.com>
> AuthorDate:    Fri, 15 Mar 2024 07:04:33 -07:00
> Committer:     Ingo Molnar <mingo@...nel.org>
> CommitterDate: Fri, 22 Mar 2024 10:17:11 +01:00
> 
> x86/shstk: Enable shadow stacks for x32
> 
> 1. Add shadow stack support to x32 signal.
> 2. Use the 64-bit map_shadow_stack syscall for x32.
> 3. Set up shadow stack for x32.

Why are we still diddling with x32 and not patching it out instead?

https://lore.kernel.org/all/CALCETrXoRAibsbWa9nfbDrt0iEuebMnCMhSFg-d9W-J2g8mDjw@mail.gmail.com/

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette