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 2/3] arm64: unwind: Prohibit probing on return_address()
Date: Thu, 18 Jul 2019 14:43:48 +0900 [thread overview]
Message-ID: <156342862798.8565.9291111633472675262.stgit@devnote2> (raw)
In-Reply-To: <156342860634.8565.14804606041960884732.stgit@devnote2>
Prohibit probing on return_address() and subroutines which
is called from return_address(), since the it is invoked from
trace_hardirqs_off() which is also kprobe blacklisted.
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
arch/arm64/kernel/return_address.c | 4 +++-
arch/arm64/kernel/stacktrace.c | 3 +++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/return_address.c b/arch/arm64/kernel/return_address.c
index b21cba90f82d..7f8a143268b0 100644
--- a/arch/arm64/kernel/return_address.c
+++ b/arch/arm64/kernel/return_address.c
@@ -8,6 +8,7 @@
#include <linux/export.h>
#include <linux/ftrace.h>
+#include <linux/kprobes.h>
#include <asm/stack_pointer.h>
#include <asm/stacktrace.h>
@@ -17,7 +18,7 @@ struct return_address_data {
void *addr;
};
-static int save_return_addr(struct stackframe *frame, void *d)
+static nokprobe_inline int save_return_addr(struct stackframe *frame, void *d)
{
struct return_address_data *data = d;
@@ -52,3 +53,4 @@ void *return_address(unsigned int level)
return NULL;
}
EXPORT_SYMBOL_GPL(return_address);
+NOKPROBE_SYMBOL(return_address);
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 62d395151abe..cd7dab54d17b 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -7,6 +7,7 @@
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/ftrace.h>
+#include <linux/kprobes.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/task_stack.h>
@@ -73,6 +74,7 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
return 0;
}
+NOKPROBE_SYMBOL(unwind_frame);
void notrace walk_stackframe(struct task_struct *tsk, struct stackframe *frame,
int (*fn)(struct stackframe *, void *), void *data)
@@ -87,6 +89,7 @@ void notrace walk_stackframe(struct task_struct *tsk, struct stackframe *frame,
break;
}
}
+NOKPROBE_SYMBOL(walk_stackframe);
#ifdef CONFIG_STACKTRACE
struct stack_trace_data {
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next prev parent reply other threads:[~2019-07-18 5:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-18 5:43 [PATCH 0/3] arm64: kprobes: Fix some bugs in arm64 kprobes Masami Hiramatsu
2019-07-18 5:43 ` [PATCH 1/3] arm64: kprobes: Recover pstate.D in single-step exception handler Masami Hiramatsu
2019-07-19 10:07 ` James Morse
2019-07-20 6:22 ` Masami Hiramatsu
2019-07-18 5:43 ` Masami Hiramatsu [this message]
2019-07-18 5:43 ` [PATCH 3/3] arm64: debug: Remove rcu_read_lock from debug exception Masami Hiramatsu
2019-07-18 6:22 ` Paul E. McKenney
2019-07-18 9:20 ` Mark Rutland
2019-07-18 14:31 ` Masami Hiramatsu
2019-07-19 8:42 ` James Morse
2019-07-20 7:32 ` Masami Hiramatsu
2019-07-21 1:50 ` Masami Hiramatsu
2019-07-19 9:59 ` Mark Rutland
2019-07-20 7:54 ` Masami Hiramatsu
2019-07-24 10:45 ` Mark Rutland
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