linux-kernel - [PATCH v2] kprobes: add a new module parameter

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Message-ID: <1463621770-25602-1-git-send-email-shijie.huang@arm.com>
Date:	Thu, 19 May 2016 09:36:10 +0800
From:	Huang Shijie <shijie.huang@....com>
To:	<akpm@...ux-foundation.org>
CC:	<nd@....com>, <pmladek@...e.com>, <steve.capper@....com>,
	<linux-kernel@...r.kernel.org>, Huang Shijie <shijie.huang@....com>
Subject: [PATCH v2] kprobes: add a new module parameter

This patch adds a new module parameter which can be used as the
symbol name. Without this patch, we can only test the "_do_fork" function
with this kernel module. With this patch, the module becomes more flexable,
we can test any functions with this module with:
   #insmod kprobe_example.ko symbol="xxx"

Signed-off-by: Huang Shijie <shijie.huang@....com>
---
v1 -- > v2:
	Add more comment for this patch.
---
 samples/kprobes/kprobe_example.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
index 727eb21..2bb190d 100644
--- a/samples/kprobes/kprobe_example.c
+++ b/samples/kprobes/kprobe_example.c
@@ -14,9 +14,13 @@
 #include <linux/module.h>
 #include <linux/kprobes.h>
 
+#define MAX_SYMBOL_LEN	64
+static char symbol[MAX_SYMBOL_LEN] = "_do_fork";
+module_param_string(symbol, symbol, sizeof(symbol), 0644);
+
 /* For each probe you need to allocate a kprobe structure */
 static struct kprobe kp = {
-	.symbol_name	= "_do_fork",
+	.symbol_name	= symbol,
 };
 
 /* kprobe pre_handler: called just before the probed instruction is executed */
-- 
2.5.5