linux-kernel - [PATCH v2 0/3] hw_breakpoint: Save privilege of access control via ptrace

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Date: Fri, 21 Jun 2024 15:39:07 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] hw_breakpoint: Save privilege of access control via ptrace

Hi all,

Thank you very much for your feedbacks in the v1 patch.
This series is based on 6.10-rc4, cross compile tested only.

As far as I can tell, these changes are not relevant with tools/perf,
on some archs such as ARM, ARM64 and LoongArch which have privilege
level of breakpoint, the initial aim is to make use of the value of
ctrl->privilege saved in decode_ctrl_reg() and then remove the check
whether bp virtual address is in kernel space to assign value for
hw->ctrl.privilege in arch_build_bp_info().

v2:
  -- Put the new member "bp_priv" at the end of the uapi
     struct perf_event_attr and add PERF_ATTR_SIZE_VER9.
  -- Update the commit message to make the goal clear.

Tiezhu Yang (3):
  perf: Add perf_event_attr::bp_priv
  arm: hw_breakpoint: Save privilege of access control via ptrace
  arm64: hw_breakpoint: Save privilege of access control via ptrace

 arch/arm/kernel/hw_breakpoint.c   |  4 +---
 arch/arm/kernel/ptrace.c          |  2 ++
 arch/arm64/kernel/hw_breakpoint.c | 11 ++---------
 arch/arm64/kernel/ptrace.c        |  2 ++
 include/uapi/linux/perf_event.h   |  3 +++
 kernel/events/hw_breakpoint.c     |  1 +
 6 files changed, 11 insertions(+), 12 deletions(-)

-- 
2.42.0