From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5527D168B4 for ; Mon, 8 May 2023 09:54:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0361C4339B; Mon, 8 May 2023 09:54:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683539660; bh=LCapMZ1+/LjFxFu3lU0qCm2SE4KyPiinndmiipswXZI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PLGszKpCQeUzg4ROKayiAL9zUpgoFrmPvHfwT3CavRI2R87DoJN6qOllRgv7qO+8m ejfdIHsGZDrnLa/vgE+Bq28kBywKJl34NH7pWx2jCAlg8BmJomGJoW5C1rZxJ1L3Hw 5amMY4odMJPz2zkSCrhouBHrFlM0DrzAHrYaSx78= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Masami Hiramatsu , Ondrej Mosnacek , "Steven Rostedt (Google)" Subject: [PATCH 6.1 096/611] tracing: Fix permissions for the buffer_percent file Date: Mon, 8 May 2023 11:38:58 +0200 Message-Id: <20230508094425.332044972@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094421.513073170@linuxfoundation.org> References: <20230508094421.513073170@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Ondrej Mosnacek 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 Fixes: 03329f993978 ("tracing: Add tracefs file buffer_percentage") Signed-off-by: Ondrej Mosnacek Signed-off-by: Steven Rostedt (Google) Signed-off-by: Greg Kroah-Hartman --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9619,7 +9619,7 @@ 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);