This patch, built against version 2.6.12, checks if probepoint address is a
function entry point using an offset value, obtained from kallsyms_lookup().
If offset is zero, we register jprobe, otherwise we return -EINVAL.
Signed-off-by: Luca Falavigna <[email protected]>
--- ./kernel/kprobes.c.orig 2005-06-29 00:17:43.000000000 +0000
+++ ./kernel/kprobes.c 2005-06-29 11:08:02.000000000 +0000
@@ -33,6 +33,7 @@
#include <linux/hash.h>
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/kallsyms.h>
#include <asm/cacheflush.h>
#include <asm/errno.h>
#include <asm/kdebug.h>
@@ -245,7 +246,15 @@ static struct notifier_block kprobe_exce
int register_jprobe(struct jprobe *jp)
{
- /* Todo: Verify probepoint is a function entry point */
+ unsigned long size, offset;
+ char *modname, namebuf[KSYM_NAME_LEN+1];
+
+ kallsyms_lookup((unsigned long)jp->kp.addr, &size,
+ &offset, &modname, namebuf);
+
+ if(unlikely(offset))
+ return -EINVAL;
+
jp->kp.pre_handler = setjmp_pre_handler;
jp->kp.break_handler = longjmp_break_handler;
Regards,
--
Luca
-
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