Commit 02106f88 authored Feb 13, 2019 by Andrea Righi Committed by Ingo Molnar Feb 13, 2019

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>

parent 2f43c602

lib/bsearch.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -11,6 +11,7 @@

		#include <linux/export.h>
		#include <linux/bsearch.h>
		#include <linux/kprobes.h>

		/*
		* bsearch - binary search an array of elements
		@@ -53,3 +54,4 @@ void bsearch(const void key, const void *base, size_t num, size_t size,
		return NULL;
		}
		EXPORT_SYMBOL(bsearch);
		NOKPROBE_SYMBOL(bsearch);

Admin message