linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: Masami Hiramatsu <mhiramat@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>
Cc: Dan Rue <dan.rue@linaro.org>,
	Daniel Diaz <daniel.diaz@linaro.org>,
	Anders Roxell <anders.roxell@linaro.org>,
	Naresh Kamboju <naresh.kamboju@linaro.org>,
	linux-kernel@vger.kernel.org, Matt Hart <matthew.hart@linaro.org>,
	linux-arm-kernel@lists.infradead.org, mhiramat@kernel.org
Subject: [PATCH v2 0/4] arm64: kprobes: Fix some bugs in arm64 kprobes
Date: Mon, 22 Jul 2019 16:48:24 +0900	[thread overview]
Message-ID: <156378170297.12011.17385386326930403235.stgit@devnote2> (raw)

Hi,

Here are the v2 patches which fixes kprobe bugs on arm64.

Naresh reported that recently ftracetest crashes kernel, and I found
there are 3 different bugs around the crash. In v1 thread, we found
one another bug of RCU and debug exception.

- Kprobes on arm64 doesn't recover pstate.D mask after single stepping.
  This causes a real kernel crash if a kprobe is unexpectedly nested.
- Some symbols which are called from blacklisted function, are not
  blacklisted.
- Debug exception is not visible to RCU, thus rcu_read_lock() cause
  a warning inside it.
- Debug exception handlers on arm64 is using rcu_read_lock(), but
  that is not needed because interrupts are disabled.

This series includes fixes for above bugs.

Thank you,

---

Masami Hiramatsu (4):
      arm64: kprobes: Recover pstate.D in single-step exception handler
      arm64: unwind: Prohibit probing on return_address()
      arm64: Make debug exception handlers visible from RCU
      arm64: Remove unneeded rcu_read_lock from debug handlers


 arch/arm64/kernel/debug-monitors.c |   14 +++++++-----
 arch/arm64/kernel/probes/kprobes.c |   41 ++++++------------------------------
 arch/arm64/kernel/return_address.c |    4 +++-
 arch/arm64/kernel/stacktrace.c     |    3 +++
 arch/arm64/mm/fault.c              |   40 +++++++++++++++++++++++++++++++++++
 5 files changed, 61 insertions(+), 41 deletions(-)

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

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2019-07-22  7:48 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-22  7:48 Masami Hiramatsu [this message]
2019-07-22  7:48 ` [PATCH v2 1/4] arm64: kprobes: Recover pstate.D in single-step exception handler Masami Hiramatsu
2019-07-23 16:03   ` James Morse
2019-07-24 13:09     ` Masami Hiramatsu
2019-07-22  7:48 ` [PATCH v2 2/4] arm64: unwind: Prohibit probing on return_address() Masami Hiramatsu
2019-07-23 16:04   ` James Morse
2019-07-24  7:39     ` Masami Hiramatsu
2019-07-22  7:48 ` [PATCH v2 3/4] arm64: Make debug exception handlers visible from RCU Masami Hiramatsu
2019-07-22 12:07   ` Paul E. McKenney
2019-07-23 17:07   ` James Morse
2019-07-24 11:47     ` Masami Hiramatsu
2019-07-22  7:49 ` [PATCH v2 4/4] arm64: Remove unneeded rcu_read_lock from debug handlers Masami Hiramatsu
2019-07-22 12:07   ` Paul E. McKenney

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=156378170297.12011.17385386326930403235.stgit@devnote2 \
    --to=mhiramat@kernel.org \
    --cc=anders.roxell@linaro.org \
    --cc=catalin.marinas@arm.com \
    --cc=dan.rue@linaro.org \
    --cc=daniel.diaz@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=matthew.hart@linaro.org \
    --cc=naresh.kamboju@linaro.org \
    --cc=will.deacon@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).