All of lore.kernel.org
 help / color / mirror / Atom feed
From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org, Borislav Petkov <bp@alien8.de>,
	Brian Gerst <brgerst@gmail.com>, Andi Kleen <andi@firstfloor.org>,
	Andy Lutomirski <luto@kernel.org>
Subject: [PATCH 0/8] x86: A round of x86 segmentation improvements
Date: Tue, 26 Apr 2016 12:23:23 -0700	[thread overview]
Message-ID: <cover.1461698311.git.luto@kernel.org> (raw)

Hi all-

This is preparation for enabling FSGSBASE and fixing FS/GS switching
better than my last attempt.

It cleans up the code, fixes two more holes in X86_BUG_NULL_SEG
handling (loadsegment(fs, val) and load_gs_index(val) failure
handling), and makes set_thread_area behave in a well-defined
manner.

With these patches applied, modify_ldt should be the last remaining
way for a user thread to get its cached descriptors out of sync with
memory, except in the 64-bit FS/GS < 3 case.  I'll fix modify_ldt as
well, but those patches will come later.

I'm sending these now because they seem to be good improvements on
their own and it'll help avoid a monster patch series down the road.

Tested on x86_32 with and without lazy GS and on x86_64.

Andy Lutomirski (8):
  x86/asm: Stop depending on ptrace.h in alternative.h
  x86/asm: Make asm/alternative.h safe from assembly
  x86/segments/64: When loadsegment(fs, ...) fails, clear the base
  x86/segments/64: When load_gs_index fails, clear the base
  x86/arch_prctl/64: Remove FSBASE/GSBASE < 4G optimization
  x86/asm/64: Rename thread_struct's fs and gs to fsbase and gsbase
  x86/tls: Synchronize segment registers in set_thread_area
  selftests/x86/ldt_gdt: Test set_thread_area deletion of an active
    segment

 arch/x86/entry/entry_64.S             |   6 +
 arch/x86/include/asm/alternative.h    |  35 +----
 arch/x86/include/asm/elf.h            |   6 +-
 arch/x86/include/asm/kgdb.h           |   2 +
 arch/x86/include/asm/processor.h      |  11 +-
 arch/x86/include/asm/segment.h        |  49 +++++--
 arch/x86/include/asm/setup.h          |   1 +
 arch/x86/include/asm/text-patching.h  |  40 ++++++
 arch/x86/kernel/alternative.c         |   1 +
 arch/x86/kernel/cpu/common.c          |   2 +-
 arch/x86/kernel/jump_label.c          |   1 +
 arch/x86/kernel/kgdb.c                |   1 +
 arch/x86/kernel/kprobes/core.c        |   1 +
 arch/x86/kernel/kprobes/opt.c         |   1 +
 arch/x86/kernel/module.c              |   1 +
 arch/x86/kernel/process_64.c          |  97 ++++---------
 arch/x86/kernel/ptrace.c              |  48 ++-----
 arch/x86/kernel/tls.c                 |  42 ++++++
 arch/x86/kernel/traps.c               |   1 +
 arch/x86/kvm/svm.c                    |   2 +-
 arch/x86/mm/extable.c                 |  10 ++
 tools/testing/selftests/x86/ldt_gdt.c | 250 ++++++++++++++++++++++++++++++++++
 22 files changed, 446 insertions(+), 162 deletions(-)
 create mode 100644 arch/x86/include/asm/text-patching.h

-- 
2.5.5

             reply	other threads:[~2016-04-26 19:23 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-26 19:23 Andy Lutomirski [this message]
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
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=cover.1461698311.git.luto@kernel.org \
    --to=luto@kernel.org \
    --cc=andi@firstfloor.org \
    --cc=bp@alien8.de \
    --cc=brgerst@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=x86@kernel.org \
    --subject='Re: [PATCH 0/8] x86: A round of x86 segmentation improvements' \
    /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

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.