linux-kernel - [PATCH v3 0/7] x86/ptrace: regset access to the GDT and LDT

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Date:   Thu, 21 Jun 2018 14:17:47 -0700
From:   "H. Peter Anvin, Intel" <h.peter.anvin@...el.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     "H. Peter Anvin" <hpa@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        "Chang S . Bae" <chang.seok.bae@...el.com>,
        "Markus T . Metzger" <markus.t.metzger@...el.com>,
        "H . Peter Anvin" <hpa@...or.com>
Subject: [PATCH v3 0/7] x86/ptrace: regset access to the GDT and LDT

From: "H. Peter Anvin" <hpa@...ux.intel.com>

Give a debugger access to the visible part of the GDT and LDT.  This
allows a debugger to find out what a particular segment descriptor
corresponds to; e.g. if %cs is 16, 32, or 64 bits.

v3:
	Requalify LDT segments for selectors that have actually changed.

v2:
	Add missing change to elf.h for the very last patch.

Cc: Ingo Molnar <mingo@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Chang S. Bae <chang.seok.bae@...el.com>
Cc: Markus T. Metzger <markus.t.metzger@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>

 arch/x86/Kconfig               |   4 +
 arch/x86/include/asm/desc.h    |  24 +++-
 arch/x86/include/asm/ldt.h     |  16 +++
 arch/x86/include/asm/segment.h |  10 ++
 arch/x86/kernel/Makefile       |   3 +-
 arch/x86/kernel/ldt.c          | 283 ++++++++++++++++++++++++++++++++---------
 arch/x86/kernel/ptrace.c       | 103 ++++++++++++++-
 arch/x86/kernel/tls.c          | 102 +++++----------
 arch/x86/kernel/tls.h          |   8 +-
 include/uapi/linux/elf.h       |   2 +
 10 files changed, 413 insertions(+), 142 deletions(-)