linux-kernel - [PATCH v2 0/6] tracing/eprobes: Fixes for unexpected arguments

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Date:   Sat, 20 Aug 2022 09:43:16 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
        Tom Zanussi <zanussi@...nel.org>
Subject: [PATCH v2 0/6] tracing/eprobes: Fixes for unexpected arguments


While using eprobes, I decided to entertain the thougth of what would
happen if I tried to get the instruction pointer "%rip", knowing full
well that eprobes do not have access to pt_regs. Well, I found out, and
it led me down a rabbit hole of bugs.

This series fixes those bugs, by not allowing register access for eprobes,
and also filling the holes of @symbol and @immediate argument.

Changes since v1: https://lore.kernel.org/all/20220820014035.531145719@goodmis.org/
  - Fixed parenthesis warning

  - Fixed comment about comm arguments

  - Made kprobes and eprobes process "$COMM" as well as "$comm"

  - Made filters consistent with histograms with "common_cpu"

Steven Rostedt (Google) (6):
      tracing/eprobes: Do not allow eprobes to use $stack, or % for regs
      tracing/eprobes: Do not hardcode $comm as a string
      tracing/eprobes: Fix reading of string fields
      tracing/eprobes: Have event probes be consistent with kprobes and uprobes
      tracing/probes: Have kprobes and uprobes use $COMM too
      tracing: Have filter accept "common_cpu" to be consistent

----
 kernel/trace/trace_eprobe.c | 91 ++++++++++++++++++++++++++++++++++++++++++---
 kernel/trace/trace_events.c |  1 +
 kernel/trace/trace_probe.c  | 29 +++++++++------
 3 files changed, 104 insertions(+), 17 deletions(-)