Kprobes: The ON/OFF knob thru debugfs

This patch provides a debugfs knob to turn kprobes on/off

o A new file /debug/kprobes/enabled indicates if kprobes is enabled or
  not (default enabled)
o Echoing 0 to this file will disarm all installed probes
o Any new probe registration when disabled will register the probe but
  not arm it. A message will be printed out in such a case.
o When a value 1 is echoed to the file, all probes (including ones
  registered in the intervening period) will be enabled
o Unregistration will happen irrespective of whether probes are globally
  enabled or not.
o Update Documentation/kprobes.txt to reflect these changes. While there
  also update the doc to make it current.

We are also looking at providing sysrq key support to tie to the disabling
feature provided by this patch.

[akpm@linux-foundation.org: Use bool like a bool!]
[akpm@linux-foundation.org: add printk facility levels]
[cornelia.huck@de.ibm.com: Add the missing arch_trampoline_kprobe() for s390]
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 149 insertions, 7 deletions

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index f58f171..9e47d8c 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -43,9 +43,11 @@
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/kdebug.h>
+
 #include <asm-generic/sections.h>
 #include <asm/cacheflush.h>
 #include <asm/errno.h>
+#include <asm/uaccess.h>
 
 #define KPROBE_HASH_BITS 6
 #define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS)
@@ -64,6 +66,9 @@ static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE];
 static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
 static atomic_t kprobe_count;
 
+/* NOTE: change this value only with kprobe_mutex held */
+static bool kprobe_enabled;
+
 DEFINE_MUTEX(kprobe_mutex);		/* Protects kprobe_table */
 DEFINE_SPINLOCK(kretprobe_lock);	/* Protects kretprobe_inst_table */
 static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
@@ -564,12 +569,13 @@ static int __kprobes __register_kprobe(struct kprobe *p,
 	hlist_add_head_rcu(&p->hlist,
 		       &kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]);
 
-	if (atomic_add_return(1, &kprobe_count) == \
+	if (kprobe_enabled) {
+		if (atomic_add_return(1, &kprobe_count) == \
 				(ARCH_INACTIVE_KPROBE_COUNT + 1))
-		register_page_fault_notifier(&kprobe_page_fault_nb);
-
-	arch_arm_kprobe(p);
+			register_page_fault_notifier(&kprobe_page_fault_nb);
 
+		arch_arm_kprobe(p);
+	}
 out:
 	mutex_unlock(&kprobe_mutex);
 
@@ -607,8 +613,13 @@ valid_p:
 	if (old_p == p ||
 	    (old_p->pre_handler == aggr_pre_handler &&
 	     p->list.next == &old_p->list && p->list.prev == &old_p->list)) {
-		/* Only probe on the hash list */
-		arch_disarm_kprobe(p);
+		/*
+		 * Only probe on the hash list. Disarm only if kprobes are
+		 * enabled - otherwise, the breakpoint would already have
+		 * been removed. We save on flushing icache.
+		 */
+		if (kprobe_enabled)
+			arch_disarm_kprobe(p);
 		hlist_del_rcu(&old_p->hlist);
 		cleanup_p = 1;
 	} else {
@@ -797,6 +808,9 @@ static int __init init_kprobes(void)
 	}
 	atomic_set(&kprobe_count, 0);
 
+	/* By default, kprobes are enabled */
+	kprobe_enabled = true;
+
 	err = arch_init_kprobes();
 	if (!err)
 		err = register_die_notifier(&kprobe_exceptions_nb);
@@ -806,7 +820,7 @@ static int __init init_kprobes(void)
 
 #ifdef CONFIG_DEBUG_FS
 static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
-               const char *sym, int offset,char *modname)
+		const char *sym, int offset,char *modname)
 {
 	char *kprobe_type;
 
@@ -885,9 +899,130 @@ static struct file_operations debugfs_kprobes_operations = {
 	.release        = seq_release,
 };
 
+static void __kprobes enable_all_kprobes(void)
+{
+	struct hlist_head *head;
+	struct hlist_node *node;
+	struct kprobe *p;
+	unsigned int i;
+
+	mutex_lock(&kprobe_mutex);
+
+	/* If kprobes are already enabled, just return */
+	if (kprobe_enabled)
+		goto already_enabled;
+
+	/*
+	 * Re-register the page fault notifier only if there are any
+	 * active probes at the time of enabling kprobes globally
+	 */
+	if (atomic_read(&kprobe_count) > ARCH_INACTIVE_KPROBE_COUNT)
+		register_page_fault_notifier(&kprobe_page_fault_nb);
+
+	for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
+		head = &kprobe_table[i];
+		hlist_for_each_entry_rcu(p, node, head, hlist)
+			arch_arm_kprobe(p);
+	}
+
+	kprobe_enabled = true;
+	printk(KERN_INFO "Kprobes globally enabled\n");
+
+already_enabled:
+	mutex_unlock(&kprobe_mutex);
+	return;
+}
+
+static void __kprobes disable_all_kprobes(void)
+{
+	struct hlist_head *head;
+	struct hlist_node *node;
+	struct kprobe *p;
+	unsigned int i;
+
+	mutex_lock(&kprobe_mutex);
+
+	/* If kprobes are already disabled, just return */
+	if (!kprobe_enabled)
+		goto already_disabled;
+
+	kprobe_enabled = false;
+	printk(KERN_INFO "Kprobes globally disabled\n");
+	for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
+		head = &kprobe_table[i];
+		hlist_for_each_entry_rcu(p, node, head, hlist) {
+			if (!arch_trampoline_kprobe(p))
+				arch_disarm_kprobe(p);
+		}
+	}
+
+	mutex_unlock(&kprobe_mutex);
+	/* Allow all currently running kprobes to complete */
+	synchronize_sched();
+
+	mutex_lock(&kprobe_mutex);
+	/* Unconditionally unregister the page_fault notifier */
+	unregister_page_fault_notifier(&kprobe_page_fault_nb);
+
+already_disabled:
+	mutex_unlock(&kprobe_mutex);
+	return;
+}
+
+/*
+ * XXX: The debugfs bool file interface doesn't allow for callbacks
+ * when the bool state is switched. We can reuse that facility when
+ * available
+ */
+static ssize_t read_enabled_file_bool(struct file *file,
+	       char __user *user_buf, size_t count, loff_t *ppos)
+{
+	char buf[3];
+
+	if (kprobe_enabled)
+		buf[0] = '1';
+	else
+		buf[0] = '0';
+	buf[1] = '\n';
+	buf[2] = 0x00;
+	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t write_enabled_file_bool(struct file *file,
+	       const char __user *user_buf, size_t count, loff_t *ppos)
+{
+	char buf[32];
+	int buf_size;
+
+	buf_size = min(count, (sizeof(buf)-1));
+	if (copy_from_user(buf, user_buf, buf_size))
+		return -EFAULT;
+
+	switch (buf[0]) {
+	case 'y':
+	case 'Y':
+	case '1':
+		enable_all_kprobes();
+		break;
+	case 'n':
+	case 'N':
+	case '0':
+		disable_all_kprobes();
+		break;
+	}
+
+	return count;
+}
+
+static struct file_operations fops_kp = {
+	.read =         read_enabled_file_bool,
+	.write =        write_enabled_file_bool,
+};
+
 static int __kprobes debugfs_kprobe_init(void)
 {
 	struct dentry *dir, *file;
+	unsigned int value = 1;
 
 	dir = debugfs_create_dir("kprobes", NULL);
 	if (!dir)
@@ -900,6 +1035,13 @@ static int __kprobes debugfs_kprobe_init(void)
 		return -ENOMEM;
 	}
 
+	file = debugfs_create_file("enabled", 0600, dir,
+					&value, &fops_kp);
+	if (!file) {
+		debugfs_remove(dir);
+		return -ENOMEM;
+	}
+
 	return 0;
 }