linux-kernel - [PATCH 00/10] kprobes: Make KUnit and add stacktrace on kretprobe tests

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Date:   Fri, 15 Oct 2021 21:50:43 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Ananth N Mavinakayanahalli <ananth@...ux.ibm.com>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        mhiramat@...nel.org, Sven Schnelle <svens@...ux.ibm.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 00/10] kprobes: Make KUnit and add stacktrace on kretprobe tests

Hi,

Here is the 2nd version of the series to change the kprobes selftest
to KUnit and add testcases for stacktrace on kretprobes, which has
been fixed recently on x86. The previous version is here;

https://lore.kernel.org/all/163369609308.636038.15295764725220907794.stgit@devnote2/

In this version, I fixed some typos and coding issues according to
Will and Mark's comments. Thanks!

And I added 1 RFC patch, which will detect the unwinding error on
arm64 (just for testing) according to Mark's comment. But since
I'm not sure how to handle that error correctly in the unwinder
code. So this is just for testing.

Mark, can you tell me how can I handle it? Just asserted by WARN_ON_ONCE()
is OK? Or print out more error information? For the debugging, we need
more information, so I printed out the error code.

Thank you,

---

Masami Hiramatsu (9):
      kprobes: Add a test case for stacktrace from kretprobe handler
      x86/unwind: Compile kretprobe fixup code only if CONFIG_KRETPROBES=y
      arm64: kprobes: Record frame pointer with kretprobe instance
      arm64: kprobes: Make a frame pointer on __kretprobe_trampoline
      arm64: Recover kretprobe modified return address in stacktrace
      ARM: clang: Do not rely on lr register for stacktrace
      ARM: kprobes: Make a frame pointer on __kretprobe_trampoline
      ARM: Recover kretprobe modified return address in stacktrace
      [RFC] arm64: kprobes: Detect error of kretprobe return address fixup

Sven Schnelle (1):
      kprobes: convert tests to kunit


 arch/Kconfig                                  |    8 +
 arch/arm/Kconfig                              |    1 
 arch/arm/include/asm/stacktrace.h             |    9 +
 arch/arm/kernel/return_address.c              |    4 
 arch/arm/kernel/stacktrace.c                  |   17 +
 arch/arm/probes/kprobes/core.c                |   29 ++
 arch/arm64/Kconfig                            |    1 
 arch/arm64/include/asm/stacktrace.h           |    4 
 arch/arm64/kernel/probes/kprobes.c            |    4 
 arch/arm64/kernel/probes/kprobes_trampoline.S |    4 
 arch/arm64/kernel/stacktrace.c                |   13 +
 arch/x86/Kconfig                              |    1 
 arch/x86/include/asm/unwind.h                 |    6 
 include/linux/kprobes.h                       |    2 
 kernel/kprobes.c                              |   52 +++
 kernel/test_kprobes.c                         |  374 ++++++++++++++-----------
 lib/Kconfig.debug                             |    3 
 17 files changed, 359 insertions(+), 173 deletions(-)

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