Commit a39f15b9 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Ingo Molnar

kprobes: Prohibit probing on RCU debug routine

Since kprobe itself depends on RCU, probing on RCU debug
routine can cause recursive breakpoint bugs.

Prohibit probing on RCU debug routines.

int3
 ->do_int3()
   ->ist_enter()
     ->RCU_LOCKDEP_WARN()
       ->debug_lockdep_rcu_enabled() -> int3
Signed-off-by: default avatarMasami 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/154998807741.31052.11229157537816341591.stgit@devboxSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 984640ce
...@@ -52,6 +52,7 @@ ...@@ -52,6 +52,7 @@
#include <linux/tick.h> #include <linux/tick.h>
#include <linux/rcupdate_wait.h> #include <linux/rcupdate_wait.h>
#include <linux/sched/isolation.h> #include <linux/sched/isolation.h>
#include <linux/kprobes.h>
#define CREATE_TRACE_POINTS #define CREATE_TRACE_POINTS
...@@ -249,6 +250,7 @@ int notrace debug_lockdep_rcu_enabled(void) ...@@ -249,6 +250,7 @@ int notrace debug_lockdep_rcu_enabled(void)
current->lockdep_recursion == 0; current->lockdep_recursion == 0;
} }
EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled); EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled);
NOKPROBE_SYMBOL(debug_lockdep_rcu_enabled);
/** /**
* rcu_read_lock_held() - might we be in RCU read-side critical section? * rcu_read_lock_held() - might we be in RCU read-side critical section?
......
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