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

Use the notifier mechanism to register uprobes exception notifier.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
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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