linux-kernel - [PATCH 0/2] tracing/wprobe: Fix to avoid inifinite watchpoint exception on arm64

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <176179481538.959775.12326313742393696258.stgit@devnote2>
Date: Thu, 30 Oct 2025 12:26:55 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Cc: Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Will Deacon <will@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 0/2] tracing/wprobe: Fix to avoid inifinite watchpoint exception on arm64

Hi,

Here are patches which fixes a wprobe bug reported by Mark Brown on
arm64[1]. The root cause was that the infinite watchpoint exception on
the same instruction, because arm64 watchpoint exception happens before
the memory access has done, it needs to configure a single-step after
calling overflow handler. It does that only for the default overflow
handlers, and not for custom overflow handler registered via
hw_breakpoint interface.

[1] https://lore.kernel.org/all/aPvwGhMBJqMKcC9D@finisterre.sirena.org.uk/

To fix this issue, this series introduces default_overflow_compatible
flag in the perf_event and use it for identifying default overflow
handlers instead of checking handler functions everytime[1/2], and
set it in wprobe[2/2].

Thank you,

---

Masami Hiramatsu (Google) (2):
      perf: Introduce default_overflow_compatible flag
      tracing: wprobe: Make wprobe_handler default overflow_handler compatible

 include/linux/perf_event.h  |    9 ++-------
 kernel/events/core.c        |    2 ++
 kernel/trace/trace_wprobe.c |    7 +++++++
 3 files changed, 11 insertions(+), 7 deletions(-)

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