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authorMasami Hiramatsu <mhiramat@kernel.org>2020-08-29 16:02:47 +0300
committerIngo Molnar <mingo@kernel.org>2020-09-08 12:52:35 +0300
commitb338817807538c893540e393856b79cbbdf777ea (patch)
treebf4dadbf3fc3746a7028c415f2baf40032c95e99 /include/linux/kprobes.h
parente03b4a084ea6b0a18b0e874baec439e69090c168 (diff)
downloadlinux-b338817807538c893540e393856b79cbbdf777ea.tar.xz
kprobes: Free kretprobe_instance with RCU callback
Free kretprobe_instance with RCU callback instead of directly freeing the object in the kretprobe handler context. This will make kretprobe run safer in NMI context. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/159870616685.1229682.11978742048709542226.stgit@devnote2
Diffstat (limited to 'include/linux/kprobes.h')
-rw-r--r--include/linux/kprobes.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 72142ae5df3e..3389067d88b1 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -156,7 +156,10 @@ struct kretprobe {
};
struct kretprobe_instance {
- struct hlist_node hlist;
+ union {
+ struct hlist_node hlist;
+ struct rcu_head rcu;
+ };
struct kretprobe *rp;
kprobe_opcode_t *ret_addr;
struct task_struct *task;
@@ -395,7 +398,6 @@ int register_kretprobes(struct kretprobe **rps, int num);
void unregister_kretprobes(struct kretprobe **rps, int num);
void kprobe_flush_task(struct task_struct *tk);
-void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
int disable_kprobe(struct kprobe *kp);
int enable_kprobe(struct kprobe *kp);