linux-kernel - Re: [PATCH] x86/shstk: Enable shadow stack for x32

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <264400cc-ccb6-46c5-b054-403f6b82860a@intel.com>
Date: Fri, 22 Mar 2024 09:49:37 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: "H.J. Lu" <hjl.tools@...il.com>, linux-kernel@...r.kernel.org
Cc: x86@...nel.org, Rick P Edgecombe <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH] x86/shstk: Enable shadow stack for x32

On 3/15/24 07:04, H.J. Lu wrote:
> 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.
> 
> Tested with shadow stack enabled x32 glibc on Intel Tiger Lake.

I don't think we should wire up code that's never going to get used in
practice.  I think I'd want to be sure of the existence of some
specific, real-world, long-term users of this before we add a new ABI
that we need to support forever.

Are there real users?