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

From: H. Peter Anvin, Intel
Date: Thu Jun 21 2018 - 17:18:33 EST


From: "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>

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@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Chang S. Bae <chang.seok.bae@xxxxxxxxx>
Cc: Markus T. Metzger <markus.t.metzger@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>

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(-)