From 5ef740424c5bdb8ee435bb620d26a188fa2962d5 Mon Sep 17 00:00:00 2001 From: Ondrej Mosnacek Date: Mon, 24 Jun 2024 10:43:14 +0800 Subject: [PATCH] tracing: Fix permissions for the buffer_percent file mainline inclusion from mainline-v6.4-rc1 commit 4f94559f40ad06d627c0fdfc3319cec778a2845b category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IA7NPI Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f94559f40ad06d627c0fdfc3319cec778a2845b -------------------------------- 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 Fixes: 03329f993978 ("tracing: Add tracefs file buffer_percentage") Signed-off-by: Ondrej Mosnacek Signed-off-by: Steven Rostedt (Google) Signed-off-by: Zheng Yejian (cherry picked from commit 9233910933a066e60aa260ba0b661ffd6a007812) --- 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 26790212ceb7..02daa5918281 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9187,7 +9187,7 @@ 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); -- Gitee