From: Masami Hiramatsu <mhiramat@kernel.org> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com> Cc: mhiramat@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Naresh Kamboju <naresh.kamboju@linaro.org>, Dan Rue <dan.rue@linaro.org>, Matt Hart <matthew.hart@linaro.org>, Anders Roxell <anders.roxell@linaro.org>, Daniel Diaz <daniel.diaz@linaro.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>
WARNING: multiple messages have this Message-ID (diff)
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
next reply other threads:[~2019-07-22 7:48 UTC|newest] Thread overview: 26+ 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 0/4] arm64: kprobes: Fix some bugs in arm64 kprobes Masami Hiramatsu 2019-07-22 7:48 ` [PATCH v2 1/4] arm64: kprobes: Recover pstate.D in single-step exception handler Masami Hiramatsu 2019-07-22 7:48 ` Masami Hiramatsu 2019-07-23 16:03 ` James Morse 2019-07-23 16:03 ` James Morse 2019-07-24 13:09 ` Masami Hiramatsu 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 2019-07-22 7:48 ` Masami Hiramatsu 2019-07-23 16:04 ` James Morse 2019-07-23 16:04 ` James Morse 2019-07-24 7:39 ` Masami Hiramatsu 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 7:48 ` Masami Hiramatsu 2019-07-22 12:07 ` Paul E. McKenney 2019-07-22 12:07 ` Paul E. McKenney 2019-07-23 17:07 ` James Morse 2019-07-23 17:07 ` James Morse 2019-07-24 11:47 ` Masami Hiramatsu 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 7:49 ` Masami Hiramatsu 2019-07-22 12:07 ` Paul E. McKenney 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: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.