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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/kernel/trace/trace_events_trigger.c
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@@ -5,6 +5,7 @@
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  * Copyright (C) 2013 Tom Zanussi <tom.zanussi@linux.intel.com>
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  */
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+#include <linux/security.h>
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 #include <linux/module.h>
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 #include <linux/ctype.h>
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 #include <linux/mutex.h>
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@@ -174,7 +175,11 @@
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 static int event_trigger_regex_open(struct inode *inode, struct file *file)
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 {
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-	int ret = 0;
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+	int ret;
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+
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+	ret = security_locked_down(LOCKDOWN_TRACEFS);
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+	if (ret)
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+		return ret;
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 	mutex_lock(&event_mutex);
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@@ -209,7 +214,7 @@
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 	return ret;
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 }
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-static int trigger_process_regex(struct trace_event_file *file, char *buff)
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+int trigger_process_regex(struct trace_event_file *file, char *buff)
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 {
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 	char *command, *next;
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 	struct event_command *p;
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@@ -299,6 +304,7 @@
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 static int
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 event_trigger_open(struct inode *inode, struct file *filp)
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 {
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+	/* Checks for tracefs lockdown */
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 	return event_trigger_regex_open(inode, filp);
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 }
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@@ -750,7 +756,8 @@
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 		goto out;
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 	/* The filter is for the 'trigger' event, not the triggered event */
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-	ret = create_event_filter(file->event_call, filter_str, false, &filter);
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+	ret = create_event_filter(file->tr, file->event_call,
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+				  filter_str, false, &filter);
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 	/*
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 	 * If create_event_filter() fails, filter still needs to be freed.
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 	 * Which the calling code will do with data->filter.
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@@ -1212,7 +1219,12 @@
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 stacktrace_trigger(struct event_trigger_data *data, void *rec,
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 		   struct ring_buffer_event *event)
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 {
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-	trace_dump_stack(STACK_SKIP);
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+	struct trace_event_file *file = data->private_data;
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+
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+	if (file)
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+		__trace_stack(file->tr, tracing_gen_ctx(), STACK_SKIP);
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+	else
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+		trace_dump_stack(STACK_SKIP);
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 }
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 static void