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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Ingo Molnar <mingo@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
	peterz@infradead.org,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Andrea Righi <righi.andrea@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>
Subject: [PATCH -tip v3 10/10] kprobes: Prohibit probing on bsearch()
Date: Wed, 13 Feb 2019 01:15:34 +0900
Message-ID: <154998813406.31052.8791425358974650922.stgit@devbox> (raw)
In-Reply-To: <154998785011.31052.1475728497912659748.stgit@devbox>

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);


  parent reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-12 16:10 [PATCH -tip v3 00/10] kprobes: Fix and improve blacklist symbols Masami Hiramatsu
2019-02-12 16:11 ` [PATCH -tip v3 01/10] x86/kprobes: Prohibit probing on optprobe template code Masami Hiramatsu
2019-02-13  8:58   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:11 ` [PATCH -tip v3 02/10] x86/kprobes: Move trampoline code into RODATA Masami Hiramatsu
2019-02-13  8:59   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:12 ` [PATCH -tip v3 03/10] x86/kprobes: Prohibit probing on functions before kprobe_int3_handler() Masami Hiramatsu
2019-02-13  9:00   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:12 ` [PATCH -tip v3 04/10] x86/kprobes: Prohibit probing on IRQ handlers directly Masami Hiramatsu
2019-02-13  9:00   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-03-25 21:23   ` [PATCH -tip v3 04/10] " Steven Rostedt
2019-03-26 14:50     ` Masami Hiramatsu
2019-03-26 15:17       ` Andrea Righi
2019-02-12 16:13 ` [PATCH -tip v3 05/10] kprobes: Search non-suffixed symbol in blacklist Masami Hiramatsu
2019-02-13  7:13   ` Ingo Molnar
2019-02-13  7:17     ` Ingo Molnar
2019-02-13 13:43       ` Steven Rostedt
2019-02-13 23:44       ` Masami Hiramatsu
2019-02-13  9:01   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:13 ` [PATCH -tip v3 06/10] kprobes: Prohibit probing on hardirq tracers Masami Hiramatsu
2019-02-13  9:02   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:14 ` [PATCH -tip v3 07/10] kprobes: Prohibit probing on preempt_check debug functions Masami Hiramatsu
2019-02-13  9:02   ` [tip:perf/core] kprobes: Prohibit probing on preemption checking " tip-bot for Masami Hiramatsu
2019-02-12 16:14 ` [PATCH -tip v3 08/10] kprobes: Prohibit probing on RCU debug routine Masami Hiramatsu
2019-02-13  9:03   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:15 ` [PATCH -tip v3 09/10] kprobes: Prohibit probing on lockdep functions Masami Hiramatsu
2019-02-13  9:03   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2019-02-12 16:15 ` Masami Hiramatsu [this message]
2019-02-13  9:04   ` [tip:perf/core] kprobes: Prohibit probing on bsearch() tip-bot for Andrea Righi

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