From: Ondrej Mosnacek <omosnace@redhat.com>
Date: Wed, 3 May 2023 16:01:14 +0200
Subject: [PATCH] tracing: Fix permissions for the buffer_percent file
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: 4f94559f40ad06d627c0fdfc3319cec778a2845b
commit 4f94559f40ad06d627c0fdfc3319cec778a2845b upstream.
This file defines both read and write operations, yet it is being
created as read-only. This means that it can't be written to without the
CAP_DAC_OVERRIDE capability. Fix the permissions to allow root to write
to it without the need to override DAC perms.
Link: https://lore.kernel.org/linux-trace-kernel/20230503140114.3280002-1-omosnace@redhat.com
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: 03329f993978 ("tracing: Add tracefs file buffer_percentage")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
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 36a60378..5909aaf2 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -9658,7 +9658,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
tr->buffer_percent = 50;
- trace_create_file("buffer_percent", TRACE_MODE_READ, d_tracer,
+ trace_create_file("buffer_percent", TRACE_MODE_WRITE, d_tracer,
tr, &buffer_percent_fops);
create_trace_options_dir(tr);
--
2.35.3