From: Ananth N Mavinakayanahalli <[email protected]>
On architectures which have no-execute support, we use a
module_alloc()ed scratch area to store the kprobed instruction
for out-of-line single-stepping. This instruction slot is
released during unregister_kprobe().
We are currently releasing the slot before synchronize_sched()
would return, leading to a potential reuse of the slot by
another kprobe before the current references are released.
Small patch to fix that condition.
Signed-off-by: Ananth N Mavinakayanahalli <[email protected]>
Acked-by: Anil S Keshavamurthy <[email protected]>
---
kernel/kprobes.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletion(-)
Index: linux-2.6.15-rc3/kernel/kprobes.c
===================================================================
--- linux-2.6.15-rc3.orig/kernel/kprobes.c
+++ linux-2.6.15-rc3/kernel/kprobes.c
@@ -436,7 +436,6 @@ static inline void cleanup_kprobe(struct
arch_disarm_kprobe(p);
hlist_del_rcu(&p->hlist);
spin_unlock_irqrestore(&kprobe_lock, flags);
- arch_remove_kprobe(p);
}
static inline void cleanup_aggr_kprobe(struct kprobe *old_p,
@@ -506,6 +505,8 @@ void __kprobes unregister_kprobe(struct
cleanup_kprobe(p, flags);
synchronize_sched();
+ arch_remove_kprobe(p);
+
if (old_p->pre_handler == aggr_pre_handler &&
list_empty(&old_p->list))
kfree(old_p);
-
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