Srinivasa Ds wrote:
> Christoph Hellwig wrote:
>> On Tue, Feb 06, 2007 at 03:25:35PM +0530, Srinivasa Ds wrote:
>>> Hi folks
>>>
>>> I have developed a patch, that lists all active probes in the
>>> system. I have done this through /proc interface. Currently list is
>>> available under /proc/kprobes/list. Any suggestions for better place and
>>> name??
>> /debug/kprobes/list? :)
>>
> Good Idea, I will update my patch to use debugfs.
Patch that uses debugfs.
Signed-off-by: Srinivasa DS <[email protected]>
fs/debugfs/inode.c | 4 ++
include/linux/kprobes.h | 4 ++
kernel/kprobes.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 100 insertions(+)
Index: linux-2.6.20/fs/debugfs/inode.c
===================================================================
--- linux-2.6.20.orig/fs/debugfs/inode.c
+++ linux-2.6.20/fs/debugfs/inode.c
@@ -25,6 +25,7 @@
#include <linux/namei.h>
#include <linux/debugfs.h>
#include <linux/fsnotify.h>
+#include <linux/kprobes.h>
#define DEBUGFS_MAGIC 0x64626720
@@ -320,6 +321,9 @@ static int __init debugfs_init(void)
retval = register_filesystem(&debug_fs_type);
if (retval)
subsystem_unregister(&debug_subsys);
+#ifdef CONFIG_KPROBES
+ debugfs_kprobe_init();
+#endif
return retval;
}
Index: linux-2.6.20/kernel/kprobes.c
===================================================================
--- linux-2.6.20.orig/kernel/kprobes.c
+++ linux-2.6.20/kernel/kprobes.c
@@ -39,6 +39,8 @@
#include <linux/moduleloader.h>
#include <linux/kallsyms.h>
#include <linux/freezer.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
#include <asm-generic/sections.h>
#include <asm/cacheflush.h>
#include <asm/errno.h>
@@ -815,6 +817,96 @@ static int __init init_kprobes(void)
return err;
}
+static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
+ const char *sym, int offset,char *modname)
+{
+ char *kprobe_type;
+
+ if (p->pre_handler == pre_handler_kretprobe)
+ kprobe_type = "r";
+ else if (p->pre_handler == setjmp_pre_handler)
+ kprobe_type = "j";
+ else
+ kprobe_type = "k";
+ if (sym)
+ seq_printf(pi, "%p %s %s+0x%x %s\n", p->addr, kprobe_type,
+ sym, offset, (modname ? modname : " "));
+ else
+ seq_printf(pi, "%p %s %p\n", p->addr, kprobe_type, p->addr);
+}
+
+void __kprobes *kprobe_seq_start(struct seq_file *f, loff_t *pos)
+{
+ return (*pos < KPROBE_TABLE_SIZE) ? pos : NULL;
+}
+
+void __kprobes *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos)
+{
+ (*pos)++;
+ if (*pos >= KPROBE_TABLE_SIZE)
+ return NULL;
+ return pos;
+}
+
+void __kprobes kprobe_seq_stop(struct seq_file *f, void *v)
+{
+ /* Nothing to do */
+}
+
+int __kprobes show_kprobe_addr(struct seq_file *pi, void *v)
+{
+ struct hlist_head *head;
+ struct hlist_node *node;
+ struct kprobe *p, *kp;
+ unsigned int i = *(loff_t *) v;
+ unsigned long size, offset = 0;
+ char *modname, namebuf[128];
+ const char *sym = NULL;
+
+ head = &kprobe_table[i];
+ preempt_disable();
+ hlist_for_each_entry_rcu(p, node, head, hlist) {
+ sym = kallsyms_lookup((unsigned long)p->addr, &size,
+ &offset, &modname, namebuf);
+ if (p->pre_handler == aggr_pre_handler) {
+ list_for_each_entry_rcu(kp, &p->list, list)
+ report_probe(pi, kp, sym, offset, modname);
+ } else
+ report_probe(pi, p, sym, offset, modname);
+ }
+ preempt_enable();
+ return 0;
+}
+
+struct seq_operations kprobes_seq_ops = {
+ .start = kprobe_seq_start,
+ .next = kprobe_seq_next,
+ .stop = kprobe_seq_stop,
+ .show = show_kprobe_addr
+};
+
+static int __kprobes kprobes_open(struct inode *inode, struct file *filp)
+{
+ return seq_open(filp, &kprobes_seq_ops);
+}
+
+static struct file_operations proc_kprobes_operations = {
+ .open = kprobes_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+void __kprobes debugfs_kprobe_init(void)
+{
+ struct dentry *dir;
+
+ dir = debugfs_create_dir("kprobes", NULL);
+ if (dir == NULL)
+ return;
+ debugfs_create_file("list", 0444, dir , 0 , &proc_kprobes_operations);
+}
+
__initcall(init_kprobes);
EXPORT_SYMBOL_GPL(register_kprobe);
Index: linux-2.6.20/include/linux/kprobes.h
===================================================================
--- linux-2.6.20.orig/include/linux/kprobes.h
+++ linux-2.6.20/include/linux/kprobes.h
@@ -203,6 +203,7 @@ struct kretprobe_instance *get_free_rp_i
void add_rp_inst(struct kretprobe_instance *ri);
void kprobe_flush_task(struct task_struct *tk);
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
+void debugfs_kprobe_init(void);
#else /* CONFIG_KPROBES */
#define __kprobes /**/
@@ -240,5 +241,8 @@ static inline void unregister_kretprobe(
static inline void kprobe_flush_task(struct task_struct *tk)
{
}
+static inline void proc_kprobe_init(void)
+{
+}
#endif /* CONFIG_KPROBES */
#endif /* _LINUX_KPROBES_H */
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