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Subject[PATCH -tip v3 10/10] kprobes: Prohibit probing on bsearch()
Date
From: Andrea Righi <righi.andrea@gmail.com>

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>
---
lib/bsearch.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/lib/bsearch.c b/lib/bsearch.c
index 18b445b010c3..82512fe7b33c 100644
--- a/lib/bsearch.c
+++ b/lib/bsearch.c
@@ -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);
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