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SubjectRe: [PATCH] Kprobes /proc entry
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Hash: SHA1

Voilà! Here is kprobes debug patch via debugfs.



- --- ./kernel/kprobes.c 2005-01-13 20:41:11.000000000 +0100
+++ ./kernel/kprobes.c 2005-01-13 20:39:27.000000000 +0100
@@ -33,6 +33,9 @@
#include <linux/hash.h>
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/kallsyms.h>
#include <asm/cacheflush.h>
#include <asm/errno.h>
#include <asm/kdebug.h>
@@ -131,6 +134,96 @@
unregister_kprobe(&jp->kp);
}

+#ifdef CONFIG_DEBUG_FS
+int kprobes_open(struct inode *inode, struct file *file)
+{
+ try_module_get(THIS_MODULE);
+ return 0;
+}
+
+int kprobes_release(struct inode *inode, struct file *file)
+{
+ module_put(THIS_MODULE);
+ return 0;
+}
+
+void kprobes_list_info(struct kprobe *k, char *p)
+{
+ ssize_t len = 0;
+ char *module, namebuf[KSYM_NAME_LEN+1];
+ const char *hook, *func;
+ unsigned long off, size, handler, addr = (unsigned long)k->addr;
+
+ if(k->pre_handler) {
+ handler = (unsigned long)k->pre_handler;
+ func = kallsyms_lookup(addr, &size, &off, &module, namebuf);
+ len += sprintf(p + len, "PRE\t0x%lx(%s+%#lx)\t",
+ addr, func, off);
+ hook = kallsyms_lookup(handler, &size, &off, &module, namebuf);
+ len += sprintf(p + len, "0x%lx(%s)\t%s\n", handler, hook,
+ strlen(module) ? module : "[built-in]");
+ }
+ if(k->post_handler) {
+ handler = (unsigned long)k->post_handler;
+ func = kallsyms_lookup(addr, &size, &off, &module, namebuf);
+ len += sprintf(p + len, "POST\t0x%lx(%s+%#lx)\t",
+ addr, func, off);
+ hook = kallsyms_lookup(handler, &size, &off, &module, namebuf);
+ len += sprintf(p + len, "0x%lx(%s)\t%s\n", handler, hook,
+ strlen(module) ? module : "[built-in]");
+ }
+ if(k->fault_handler) {
+ handler = (unsigned long)k->fault_handler;
+ func = kallsyms_lookup(addr, &size, &off, &module, namebuf);
+ len += sprintf(p + len, "FAULT\t0x%lx(%s+%#lx)\t",
+ addr, func, off);
+ hook = kallsyms_lookup(handler, &size, &off, &module, namebuf);
+ len += sprintf(p + len, "0x%lx(%s)\t%s\n", handler, hook,
+ strlen(module) ? module : "[built-in]");
+ }
+ if(k->break_handler) {
+ handler = (unsigned long)k->break_handler;
+ func = kallsyms_lookup(addr, &size, &off, &module, namebuf);
+ len += sprintf(p + len, "BREAK\t0x%lx(%s+%#lx)\t",
+ addr, func, off);
+ hook = kallsyms_lookup(handler, &size, &off, &module, namebuf);
+ len += sprintf(p + len, "0x%lx(%s)\t%s\n", handler, hook,
+ strlen(module) ? module : "[built-in]");
+ }
+}
+
+ssize_t kprobes_read(struct file *file, char __user *buf,
+ size_t size, loff_t *off)
+{
+ int i;
+ char *data = "";
+ ssize_t len = 0;
+ struct hlist_head *head;
+ struct hlist_node *node;
+ struct kprobe *k;
+
+ spin_lock(&kprobe_lock);
+ for(i = 0; i < KPROBE_TABLE_SIZE; i++) {
+ head = &kprobe_table[i];
+ hlist_for_each(node, head) {
+ if((k = hlist_entry(node, struct kprobe, hlist))) {
+ kprobes_list_info(k, data + len);
+ len = strlen(data);
+ }
+ }
+ }
+ spin_unlock(&kprobe_lock);
+ return simple_read_from_buffer(buf, size, off, data, len);
+}
+
+struct dentry *kprobes_dir, *kprobes_list;
+struct file_operations kprobes_fops = {
+ .open = kprobes_open,
+ .read = kprobes_read,
+ .release = kprobes_release
+ };
+#endif
+
static int __init init_kprobes(void)
{
int i, err = 0;
@@ -140,6 +233,16 @@
for (i = 0; i < KPROBE_TABLE_SIZE; i++)
INIT_HLIST_HEAD(&kprobe_table[i]);

+#ifdef CONFIG_DEBUG_FS
+ if(!(kprobes_dir = debugfs_create_dir("kprobes", NULL)))
+ return -ENODEV;
+ if(!(kprobes_list = debugfs_create_file("list", S_IRUGO, kprobes_dir,
+ NULL, &kprobes_fops))) {
+ debugfs_remove(kprobes_dir);
+ return -ENODEV;
+ }
+#endif
+
err = register_die_notifier(&kprobe_exceptions_nb);
return err;

Signed-off-by: Luca Falavigna <dktrkranz@gmail.com>


Regards,

Luca

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