[PATCH v5 3.1.0-rc4-tip 14/26] uprobe: register exception notifier

[Srikar Dronamraju]

Use the notifier mechanism to register uprobes exception notifier.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Signed-off-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
---
 kernel/uprobes.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/kernel/uprobes.c b/kernel/uprobes.c
index 8b6654e..083c577 100644
--- a/kernel/uprobes.c
+++ b/kernel/uprobes.c
@@ -30,6 +30,7 @@
 #include <linux/mmu_notifier.h>	/* set_pte_at_notify */
 #include <linux/swap.h>		/* try_to_free_swap */
 #include <linux/ptrace.h>	/* user_enable_single_step */
+#include <linux/kdebug.h>	/* notifier mechanism */
 #include <linux/uprobes.h>
 
 static struct rb_root uprobes_tree = RB_ROOT;
@@ -1209,3 +1210,20 @@ int uprobe_post_notifier(struct pt_regs *regs)
 	set_thread_flag(TIF_UPROBE);
 	return 1;
 }
+
+struct notifier_block uprobe_exception_nb = {
+	.notifier_call = uprobe_exception_notify,
+	.priority = INT_MAX - 1,	/* notified after kprobes, kgdb */
+};
+
+static int __init init_uprobes(void)
+{
+	return register_die_notifier(&uprobe_exception_nb);
+}
+
+static void __exit exit_uprobes(void)
+{
+}
+
+module_init(init_uprobes);
+module_exit(exit_uprobes);
--
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