From: Andi Kleen <andi@firstfloor.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH 5/8] x86/arch_prctl/64: Remove FSBASE/GSBASE < 4G optimization
Date: Tue, 26 Apr 2016 13:50:30 -0700 [thread overview]
Message-ID: <20160426205030.GI13997@two.firstfloor.org> (raw)
In-Reply-To: <dd1599b08866961dba9d2458faa6bbd7fba471d7.1461698311.git.luto@kernel.org>
On Tue, Apr 26, 2016 at 12:23:28PM -0700, Andy Lutomirski wrote:
> As far as I know, the optimization doesn't work on any modern distro
> because modern distros use high addresses for ASLR. Remove it.
I disagree with this patch. For example it will be a regression
for static executables. And randomly making old systems slower is a bad
idea.
-Andi
next prev parent reply other threads:[~2016-04-26 20:50 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-26 19:23 [PATCH 0/8] x86: A round of x86 segmentation improvements Andy Lutomirski
2016-04-26 19:23 ` [PATCH 1/8] x86/asm: Stop depending on ptrace.h in alternative.h Andy Lutomirski
2016-04-29 10:48 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-26 19:23 ` [PATCH 2/8] x86/asm: Make asm/alternative.h safe from assembly Andy Lutomirski
2016-04-29 10:49 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-26 19:23 ` [PATCH 3/8] x86/segments/64: When loadsegment(fs, ...) fails, clear the base Andy Lutomirski
2016-04-29 10:49 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-26 19:23 ` [PATCH 4/8] x86/segments/64: When load_gs_index " Andy Lutomirski
2016-04-29 10:49 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-26 19:23 ` [PATCH 5/8] x86/arch_prctl/64: Remove FSBASE/GSBASE < 4G optimization Andy Lutomirski
2016-04-26 20:50 ` Andi Kleen [this message]
2016-04-26 22:33 ` Andy Lutomirski
2016-04-29 10:50 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-26 19:23 ` [PATCH 6/8] x86/asm/64: Rename thread_struct's fs and gs to fsbase and gsbase Andy Lutomirski
2016-04-29 10:50 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-26 19:23 ` [PATCH 7/8] x86/tls: Synchronize segment registers in set_thread_area Andy Lutomirski
2016-04-29 10:51 ` [tip:x86/asm] x86/tls: Synchronize segment registers in set_thread_area() tip-bot for Andy Lutomirski
2016-04-26 19:23 ` [PATCH 8/8] selftests/x86/ldt_gdt: Test set_thread_area deletion of an active segment Andy Lutomirski
2016-04-29 10:51 ` [tip:x86/asm] selftests/x86/ldt_gdt: Test set_thread_area() " tip-bot for Andy Lutomirski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160426205030.GI13997@two.firstfloor.org \
--to=andi@firstfloor.org \
--cc=bp@alien8.de \
--cc=brgerst@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).