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Diffstat (limited to 'kernel/events/core.c')
-rw-r--r--kernel/events/core.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index fc1c330c6bd6..2d5fe26551f8 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4447,6 +4447,9 @@ static void _free_event(struct perf_event *event)
if (event->ctx)
put_ctx(event->ctx);
+ if (event->hw.target)
+ put_task_struct(event->hw.target);
+
exclusive_event_destroy(event);
module_put(event->pmu->module);
@@ -8397,6 +8400,10 @@ static int perf_kprobe_event_init(struct perf_event *event)
if (event->attr.type != perf_kprobe.type)
return -ENOENT;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
/*
* no branch sampling for probe events
*/
@@ -8434,6 +8441,10 @@ static int perf_uprobe_event_init(struct perf_event *event)
if (event->attr.type != perf_uprobe.type)
return -ENOENT;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
/*
* no branch sampling for probe events
*/
@@ -9955,6 +9966,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
* and we cannot use the ctx information because we need the
* pmu before we get a ctx.
*/
+ get_task_struct(task);
event->hw.target = task;
}
@@ -10070,6 +10082,8 @@ err_ns:
perf_detach_cgroup(event);
if (event->ns)
put_pid_ns(event->ns);
+ if (event->hw.target)
+ put_task_struct(event->hw.target);
kfree(event);
return ERR_PTR(err);