linux-kernel - [PATCH] tracing/synthetic: Replace deprecated strncpy() with strscpy()

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Message-ID: <20250310200359.450172-1-thorsten.blum@linux.dev>
Date: Mon, 10 Mar 2025 21:03:58 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH] tracing/synthetic: Replace deprecated strncpy() with strscpy()

strncpy() is deprecated for NUL-terminated destination buffers; use
strscpy() instead and remove the manual NUL-termination.

The destination buffer 'buf' is used only with kstrtouint() and must be
NUL-terminated, but not NUL-padded. The source string 'start' is also
guaranteed to be NUL-terminated and meets the __must_be_cstr()
requirement of strscpy().

No functional changes intended.

Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 kernel/trace/trace_events_synth.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index e3f7d09e5512..4b51f74897b4 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -207,8 +207,7 @@ static int synth_field_string_size(char *type)
 	if (len == 0)
 		return 0; /* variable-length string */
 
-	strncpy(buf, start, len);
-	buf[len] = '\0';
+	strscpy(buf, start, len + 1);
 
 	err = kstrtouint(buf, 0, &size);
 	if (err)
-- 
2.48.1