From: Ananth N Mavinakayanahalli <[email protected]>
In cases where a struct kretprobe's *_handler fields are non-NULL, it
is possible to cause a system crash, due to the possibility of calls
ending up in zombie functions. Documentation clearly states that unused
*_handlers should be set to NULL, but kprobe users sometimes fail to
do so.
Fix it by setting the non-relevant fields of the struct kretprobe to NULL.
Signed-off-by: Ananth N Mavinakayanahalli <[email protected]>
Acked-by: Jim Keniston <[email protected]>
---
kernel/kprobes.c | 3 +++
1 files changed, 3 insertions(+)
Index: linux-2.6.17-rc1/kernel/kprobes.c
===================================================================
--- linux-2.6.17-rc1.orig/kernel/kprobes.c
+++ linux-2.6.17-rc1/kernel/kprobes.c
@@ -585,6 +585,9 @@ int __kprobes register_kretprobe(struct
int i;
rp->kp.pre_handler = pre_handler_kretprobe;
+ rp->kp.post_handler = NULL;
+ rp->kp.fault_handler = NULL;
+ rp->kp.break_handler = NULL;
/* Pre-allocate memory for max kretprobe instances */
if (rp->maxactive <= 0) {
-
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