#include <linux/debugfs.h>
#include <linux/kdebug.h>
#include <linux/memory.h>
+#include <linux/ftrace.h>
#include <asm-generic/sections.h>
#include <asm/cacheflush.h>
*/
static struct kprobe_blackpoint kprobe_blacklist[] = {
{"preempt_schedule",},
+ {"native_get_debugreg",},
+ {"irq_entries_start",},
+ {"common_interrupt",},
+ {"mcount",}, /* mcount can be called from everywhere */
{NULL} /* Terminator */
};
static int kprobe_garbage_slots;
static int collect_garbage_slots(void);
-static int __kprobes check_safety(void)
-{
- int ret = 0;
-#if defined(CONFIG_PREEMPT) && defined(CONFIG_FREEZER)
- ret = freeze_processes();
- if (ret == 0) {
- struct task_struct *p, *q;
- do_each_thread(p, q) {
- if (p != current && p->state == TASK_RUNNING &&
- p->pid != 0) {
- printk("Check failed: %s is running\n",p->comm);
- ret = -1;
- goto loop_end;
- }
- } while_each_thread(p, q);
- }
-loop_end:
- thaw_processes();
-#else
- synchronize_sched();
-#endif
- return ret;
-}
-
/**
* __get_insn_slot() - Find a slot on an executable page for an instruction.
* We allocate an executable page if there's no room on existing ones.
{
struct kprobe_insn_page *kip, *next;
- /* Ensure no-one is preepmted on the garbages */
- if (check_safety())
- return -EAGAIN;
+ /* Ensure no-one is interrupted on the garbages */
+ synchronize_sched();
list_for_each_entry_safe(kip, next, &kprobe_insn_pages, list) {
int i;
return (kprobe_opcode_t *)(((char *)addr) + p->offset);
}
+/* Check passed kprobe is valid and return kprobe in kprobe_table. */
+static struct kprobe * __kprobes __get_valid_kprobe(struct kprobe *p)
+{
+ struct kprobe *old_p, *list_p;
+
+ old_p = get_kprobe(p->addr);
+ if (unlikely(!old_p))
+ return NULL;
+
+ if (p != old_p) {
+ list_for_each_entry_rcu(list_p, &old_p->list, list)
+ if (list_p == p)
+ /* kprobe p is a valid probe */
+ goto valid;
+ return NULL;
+ }
+valid:
+ return old_p;
+}
+
+/* Return error if the kprobe is being re-registered */
+static inline int check_kprobe_rereg(struct kprobe *p)
+{
+ int ret = 0;
+ struct kprobe *old_p;
+
+ mutex_lock(&kprobe_mutex);
+ old_p = __get_valid_kprobe(p);
+ if (old_p)
+ ret = -EINVAL;
+ mutex_unlock(&kprobe_mutex);
+ return ret;
+}
+
int __kprobes register_kprobe(struct kprobe *p)
{
int ret = 0;
return -EINVAL;
p->addr = addr;
+ ret = check_kprobe_rereg(p);
+ if (ret)
+ return ret;
+
preempt_disable();
if (!kernel_text_address((unsigned long) p->addr) ||
- in_kprobes_functions((unsigned long) p->addr)) {
+ in_kprobes_functions((unsigned long) p->addr) ||
+ ftrace_text_reserved(p->addr, p->addr)) {
preempt_enable();
return -EINVAL;
}
}
EXPORT_SYMBOL_GPL(register_kprobe);
-/* Check passed kprobe is valid and return kprobe in kprobe_table. */
-static struct kprobe * __kprobes __get_valid_kprobe(struct kprobe *p)
-{
- struct kprobe *old_p, *list_p;
-
- old_p = get_kprobe(p->addr);
- if (unlikely(!old_p))
- return NULL;
-
- if (p != old_p) {
- list_for_each_entry_rcu(list_p, &old_p->list, list)
- if (list_p == p)
- /* kprobe p is a valid probe */
- goto valid;
- return NULL;
- }
-valid:
- return old_p;
-}
-
/*
* Unregister a kprobe without a scheduler synchronization.
*/
/* Pre-allocate memory for max kretprobe instances */
if (rp->maxactive <= 0) {
#ifdef CONFIG_PREEMPT
- rp->maxactive = max(10, 2 * NR_CPUS);
+ rp->maxactive = max_t(unsigned int, 10, 2*num_possible_cpus());
#else
- rp->maxactive = NR_CPUS;
+ rp->maxactive = num_possible_cpus();
#endif
}
spin_lock_init(&rp->lock);
arch_remove_kprobe(p);
}
+void __kprobes dump_kprobe(struct kprobe *kp)
+{
+ printk(KERN_WARNING "Dumping kprobe:\n");
+ printk(KERN_WARNING "Name: %s\nAddress: %p\nOffset: %x\n",
+ kp->symbol_name, kp->addr, kp->offset);
+}
+
/* Module notifier call back, checking kprobes on the module */
static int __kprobes kprobes_module_callback(struct notifier_block *nb,
unsigned long val, void *data)
return seq_open(filp, &kprobes_seq_ops);
}
-static struct file_operations debugfs_kprobes_operations = {
+static const struct file_operations debugfs_kprobes_operations = {
.open = kprobes_open,
.read = seq_read,
.llseek = seq_lseek,
return count;
}
-static struct file_operations fops_kp = {
+static const struct file_operations fops_kp = {
.read = read_enabled_file_bool,
.write = write_enabled_file_bool,
};