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x86/kprobes: Prohibit probing on functions before kprobe_int3_handler()

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Prohibit probing on the functions called before kprobe_int3_handler()
in do_int3(). More specifically, ftrace_int3_handler(),
poke_int3_handler(), and ist_enter(). And since rcu_nmi_enter() is
called by ist_enter(), it also should be marked as NOKPROBE_SYMBOL.

Since those are handled before kprobe_int3_handler(), probing those
functions can cause a breakpoint recursion and crash the kernel.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrea Righi <righi.andrea@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/154998793571.31052.11301258949601150994.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Masami Hiramatsu
2019-02-13 01:12:15 +09:00
committed by Ingo Molnar
parent 877b145f0f
commit c13324a505
4 changed files with 7 additions and 2 deletions
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2
kernel/rcu/tree.c
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@@ -62,6 +62,7 @@
#include <linux/suspend.h>
#include <linux/ftrace.h>
#include <linux/tick.h>
#include <linux/kprobes.h>
#include "tree.h"
#include "rcu.h"
@@ -872,6 +873,7 @@ void rcu_nmi_enter(void)
{
rcu_nmi_enter_common(false);
}
NOKPROBE_SYMBOL(rcu_nmi_enter);
/**
* rcu_irq_enter - inform RCU that current CPU is entering irq away from idle