[PATCH 6.19 783/844] tracing: Fix to set write permission to per-cpu buffer_size_kb

[Sasha Levin]

From: "Masami Hiramatsu (Google)" <mhiramat@xxxxxxxxxx>

[ Upstream commit f844282deed7481cf2f813933229261e27306551 ]

Since the per-cpu buffer_size_kb file is writable for changing
per-cpu ring buffer size, the file should have the write access
permission.

Cc: stable@xxxxxxxxxxxxxxx
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Link: https://patch.msgid.link/177071301597.2293046.11683339475076917920.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 21ccc9cd7211 ("tracing: Disable "other" permission bits in the tracefs files")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 kernel/trace/trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8bd4ec08fb361..8e9c1bfe3ebb3 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -9398,7 +9398,7 @@ tracing_init_tracefs_percpu(struct trace_array *tr, long cpu)
 	trace_create_cpu_file("stats", TRACE_MODE_READ, d_cpu,
 				tr, cpu, &tracing_stats_fops);
 
-	trace_create_cpu_file("buffer_size_kb", TRACE_MODE_READ, d_cpu,
+	trace_create_cpu_file("buffer_size_kb", TRACE_MODE_WRITE, d_cpu,
 				tr, cpu, &tracing_entries_fops);
 
 	if (tr->range_addr_start)
-- 
2.51.0