kprobes: Prohibit probing on bsearch()
authorAndrea Righi <righi.andrea@gmail.com>
Tue, 12 Feb 2019 16:15:34 +0000 (01:15 +0900)
committerIngo Molnar <mingo@kernel.org>
Wed, 13 Feb 2019 07:16:41 +0000 (08:16 +0100)
commit02106f883cd745523f7766d90a739f983f19e650
treefb78edd3ae6c8a3ab49a81ed7f08923b02be8bf6
parent2f43c6022d84b2f562623a7023f49f1431e50747
kprobes: Prohibit probing on bsearch()

Since kprobe breakpoing handler is using bsearch(), probing on this
routine can cause recursive breakpoint problem.

int3
 ->do_int3()
   ->ftrace_int3_handler()
     ->ftrace_location()
       ->ftrace_location_range()
         ->bsearch() -> int3

Prohibit probing on bsearch().

Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.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/154998813406.31052.8791425358974650922.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
lib/bsearch.c