linux-kernel - Re: [PATCH] x86/mm: Remove broken vsyscall emulation code from the page fault code

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Date: Mon, 29 Apr 2024 08:51:11 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: Hillf Danton <hdanton@...a.com>, Andy Lutomirski <luto@...capital.net>, Peter Anvin <hpa@...or.com>, 
	Adrian Bunk <bunk@...nel.org>, 
	syzbot <syzbot+83e7f982ca045ab4405c@...kaller.appspotmail.com>, 
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, andrii@...nel.org, bpf@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] x86/mm: Remove broken vsyscall emulation code from the
 page fault code

On Mon, 29 Apr 2024 at 01:00, Ingo Molnar <mingo@...nel.org> wrote:
>
> I did some Simple Testing™, and nothing seemed to break in any way visible
> to me, and the diffstat is lovely:
>
>     3 files changed, 3 insertions(+), 56 deletions(-)
>
> Might stick this into tip:x86/mm and see what happens?

Well, Hilf had it go through the syzbot testing, and Jiri seems to
have tested it on his setup too, so it looks like it's all good, and
you can change the "Not-Yet-Signed-off-by" to be a proper sign-off
from me.

It would be good to have some UML testing done, but at the same time I
do think that anybody running UML on modern kernels should be running
a modern user-mode setup too, so while the exact SIGSEGV details may
have been an issue in 2011, I don't think it's reasonable to think
that it's an issue in 2024.

             Linus