samples/kprobes: add a new module parameter
Add 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 flexible; we
can test any functions with this module with
# insmod kprobe_example.ko symbol="xxx"
Link: http://lkml.kernel.org/r/1463535417-29637-1-git-send-email-shijie.huang@arm.com
Signed-off-by: Huang Shijie <shijie.huang@arm.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steve Capper <steve.capper@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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 */