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 A92FC2AB21 for ; Wed, 20 Sep 2023 11:59:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30892C433C7; Wed, 20 Sep 2023 11:59:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695211144; bh=K45HDIcgq/YoiW9wqwqcdzv1H+DDvIxTjrnyAhPQeW0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l1+bik+BKTmnFWGyTIcmoldC+KNoztqnBrnF8w5JBeIqALFwWLogtnDXUhiPCHGbB qTH7dy5w0e56FRIwfznDBRaemcBkudUJrzL5Nz66IhZhLzLhuFybqleqwetkFHX9Mt JMK0RZDDjAza/ebeI2Zx17AQ+WnBVEsyA7YZBack= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Masami Hiramatsu , Mark Rutland , Andrew Morton , Zheng Yejian , Linux Kernel Functional Testing , Naresh Kamboju , "Steven Rostedt (Google)" Subject: [PATCH 6.1 125/139] tracing: Have current_trace inc the trace array ref count Date: Wed, 20 Sep 2023 13:30:59 +0200 Message-ID: <20230920112840.253834037@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112835.549467415@linuxfoundation.org> References: <20230920112835.549467415@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Steven Rostedt (Google) commit 9b37febc578b2e1ad76a105aab11d00af5ec3d27 upstream. The current_trace updates the trace array tracer. For an instance, if the file is opened and the instance is deleted, reading or writing to the file will cause a use after free. Up the ref count of the trace array when current_trace is opened. Link: https://lkml.kernel.org/r/20230907024803.877687227@goodmis.org Link: https://lore.kernel.org/all/1cb3aee2-19af-c472-e265-05176fe9bd84@huawei.com/ Cc: stable@vger.kernel.org Cc: Masami Hiramatsu Cc: Mark Rutland Cc: Andrew Morton Cc: Zheng Yejian Fixes: 8530dec63e7b4 ("tracing: Add tracing_check_open_get_tr()") Tested-by: Linux Kernel Functional Testing Tested-by: Naresh Kamboju Signed-off-by: Steven Rostedt (Google) Signed-off-by: Greg Kroah-Hartman --- kernel/trace/trace.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -7708,10 +7708,11 @@ static const struct file_operations trac #endif static const struct file_operations set_tracer_fops = { - .open = tracing_open_generic, + .open = tracing_open_generic_tr, .read = tracing_set_trace_read, .write = tracing_set_trace_write, .llseek = generic_file_llseek, + .release = tracing_release_generic_tr, }; static const struct file_operations tracing_pipe_fops = {