linux-kernel - [PATCH 1/5] fgraph: Use guard(mutex)(&ftrace_lock) for unregister_ftrace

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241028071307.770550792@goodmis.org>
Date: Mon, 28 Oct 2024 03:12:29 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Thomas Gleixner <tglx@...utronix.de>,
 Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 1/5] fgraph: Use guard(mutex)(&ftrace_lock) for unregister_ftrace_graph()

From: Steven Rostedt <rostedt@...dmis.org>

The ftrace_lock is held throughout unregister_ftrace_graph(), use a guard
to simplify the error paths.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/fgraph.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 001abf376c0c..0bf78517b5d4 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -1381,17 +1381,17 @@ void unregister_ftrace_graph(struct fgraph_ops *gops)
 {
 	int command = 0;
 
-	mutex_lock(&ftrace_lock);
+	guard(mutex)(&ftrace_lock);
 
 	if (unlikely(!ftrace_graph_active))
-		goto out;
+		return;
 
 	if (unlikely(gops->idx < 0 || gops->idx >= FGRAPH_ARRAY_SIZE ||
 		     fgraph_array[gops->idx] != gops))
-		goto out;
+		return;
 
 	if (fgraph_lru_release_index(gops->idx) < 0)
-		goto out;
+		return;
 
 	fgraph_array[gops->idx] = &fgraph_stub;
 
@@ -1413,7 +1413,5 @@ void unregister_ftrace_graph(struct fgraph_ops *gops)
 		unregister_pm_notifier(&ftrace_suspend_notifier);
 		unregister_trace_sched_switch(ftrace_graph_probe_sched_switch, NULL);
 	}
- out:
 	gops->saved_func = NULL;
-	mutex_unlock(&ftrace_lock);
 }
-- 
2.45.2