This is a note to let you know that I've just added the patch titled
tracing: Fix permissions for the buffer_percent file
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-fix-permissions-for-the-buffer_percent-file.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4f94559f40ad06d627c0fdfc3319cec778a2845b Mon Sep 17 00:00:00 2001
From: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Date: Wed, 3 May 2023 16:01:14 +0200
Subject: tracing: Fix permissions for the buffer_percent file
From: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
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@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Fixes: 03329f993978 ("tracing: Add tracefs file buffer_percentage")
Signed-off-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -9565,7 +9565,7 @@ init_tracer_tracefs(struct trace_array *
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);
Patches currently in stable-queue which might be from omosnace@xxxxxxxxxx are
queue-5.15/tracing-fix-permissions-for-the-buffer_percent-file.patch
