Merge "perf: Skip permission checks on kernel owned perf events" (992a8642) · Commits · e / devices / android_kernel_xiaomi_markw

kernel/events/core.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -3241,16 +3241,18 @@ errout:
		* Returns a matching context with refcount and pincount.
		*/
		static struct perf_event_context *
		find_get_context(struct pmu pmu, struct task_struct task, int cpu)
		find_get_context(struct perf_event event, struct task_struct task, int cpu)
		{
		struct perf_event_context ctx, clone_ctx = NULL;
		struct perf_cpu_context *cpuctx;
		struct pmu *pmu = event->pmu;
		unsigned long flags;
		int ctxn, err;

		if (!task) {
		/* Must be root to operate on a CPU event: */
		if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
		if (event->owner != EVENT_OWNER_KERNEL && perf_paranoid_cpu() &&
		!capable(CAP_SYS_ADMIN))
		return ERR_PTR(-EACCES);

		/*
		@@ -7415,7 +7417,7 @@ SYSCALL_DEFINE5(perf_event_open,
		/*
		* Get the target context (task or percpu):
		*/
		ctx = find_get_context(pmu, task, event->cpu);
		ctx = find_get_context(event, task, event->cpu);
		if (IS_ERR(ctx)) {
		err = PTR_ERR(ctx);
		goto err_alloc;
		@@ -7584,7 +7586,7 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,

		account_event(event);

		ctx = find_get_context(event->pmu, task, cpu);
		ctx = find_get_context(event, task, cpu);
		if (IS_ERR(ctx)) {
		err = PTR_ERR(ctx);
		goto err_free;