linux-kernel - [PATCH v2 0/3] arm64: kprobes: Fix bugs in kprobes for arm64

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Date:   Fri,  2 Dec 2022 11:18:23 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>
Subject: [PATCH v2 0/3] arm64: kprobes: Fix bugs in kprobes for arm64

Hi,

Here is the 2nd version of the kprobe bugfixes on arm64. The previous
series is here;

https://lore.kernel.org/all/166990553243.253128.13594802750635478633.stgit@devnote3/T/#u

The first one is a critical issue, which will cause a kernel crach
easily with lockdep[1/3]. Others are minor issues and rare cases.
The [2/3] let do_page_fault() fixup the page fault in kprobes user
handler, and [3/3] is more like code cleanup and returns
DBG_HOOK_ERROR if it can not handle kprobe's BRK (but that
should not happen.)

In this version I update to use noinstr and __always_inline [1/3]
and update comments[3/3]. Also add Mark's Ack (Thanks!)

Thank you,

---

Masami Hiramatsu (Google) (3):
      arm64: Prohibit instrumentation on arch_stack_walk()
      arm64: kprobes: Let arch do_page_fault() fix up page fault in user handler
      arm64: kprobes: Return DBG_HOOK_ERROR if kprobes can not handle a BRK

 arch/arm64/kernel/probes/kprobes.c |   86 +++++++++++++++---------------------
 arch/arm64/kernel/stacktrace.c     |   10 ++--
 2 files changed, 41 insertions(+), 55 deletions(-)

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