linux-kernel - [GIT PULL] probes: Updates for v6.9

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Date: Wed, 13 Mar 2024 00:39:01 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jinghao Jia <jinghao7@...inois.edu>, Masami Hiramatsu (Google)
 <mhiramat@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, Masami
 Hiramatsu <mhiramat@...nel.org>, linux-kernel@...r.kernel.org
Subject: [GIT PULL] probes: Updates for v6.9

Hi Linus,

Probes updates for v6.9:

 - x96/kprobes: Use boolean for some function return instead of 0 and 1.
 - x86/kprobes: Prohibit probing on INT/UD. This prevents user to put kprobe on
    INTn/INT1/INT3/INTO and UD0/UD1/UD2 because these are used for a special
    purpose in the kernel.
 - x86/kprobes: Boost Grp instructions. Because a few percent of kernel
    instructions are Grp 2/3/4/5 and those are safe to be executed without
    ip register fixup, allow those to be boosted (direct execution on the
    trampoline buffer with a JMP).

 - tracing/probes: Add function argument access from return events (kretprobe
    and fprobe). This allows user to compare how a data structure field is
    changed after executing a function. With BTF, return event also accepts
    function argument access by name. This also includes below patches;
  . Fix a wrong comment (using "Kretprobe" in fprobe)
  . Cleanup a big probe argument parser function into three parts, type
     parser, post-processing function, and main parser.
  . Cleanup to set nr_args field when initializing trace_probe instead of
     counting up it while parsing.
  . Cleanup a redundant #else block from tracefs/README source code.
  . Update selftests to check entry argument access from return probes.
  . Documentation update about entry argument access from return probes.


Please pull the latest probes-v6.9 tree, which can be found at:


  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
probes-v6.9

Tag SHA1: 4c6745d26a2ff77a803db82beb2168f9c37b8f2b
Head SHA1: e8c32f24766a1f22da024e73d1eb8e9c822482ac


Jinghao Jia (3):
      x86/kprobes: Refactor can_{probe,boost} return type to bool
      x86/kprobes: Prohibit kprobing on INT and UD
      x86/kprobes: Boost more instructions from grp2/3/4/5

Masami Hiramatsu (Google) (7):
      tracing/fprobe-event: cleanup: Fix a wrong comment in fprobe event
      tracing/probes: Cleanup probe argument parser
      tracing/probes: cleanup: Set trace_probe::nr_args at trace_probe_init
      tracing: Remove redundant #else block for BTF args from README
      tracing/probes: Support $argN in return probe (kprobe and fprobe)
      selftests/ftrace: Add test cases for entry args at function exit
      Documentation: tracing: Add entry argument access at function exit

----
 Documentation/trace/fprobetrace.rst                |  31 ++
 Documentation/trace/kprobetrace.rst                |   9 +
 arch/x86/kernel/kprobes/common.h                   |   2 +-
 arch/x86/kernel/kprobes/core.c                     |  98 +++--
 kernel/trace/trace.c                               |   5 +-
 kernel/trace/trace_eprobe.c                        |   8 +-
 kernel/trace/trace_fprobe.c                        |  59 ++-
 kernel/trace/trace_kprobe.c                        |  58 ++-
 kernel/trace/trace_probe.c                         | 417 +++++++++++++++------
 kernel/trace/trace_probe.h                         |  30 +-
 kernel/trace/trace_probe_tmpl.h                    |  10 +-
 kernel/trace/trace_uprobe.c                        |  14 +-
 .../ftrace/test.d/dynevent/fprobe_entry_arg.tc     |  18 +
 .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |   4 +
 .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc   |   2 +
 .../ftrace/test.d/kprobe/kretprobe_entry_arg.tc    |  18 +
 16 files changed, 584 insertions(+), 199 deletions(-)
 create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/fprobe_entry_arg.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_entry_arg.tc


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>