linux-hardening - [PATCH v1 1/6] seq_buf: Mark binary printing functions with _

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Message-ID: <20250320180926.4002817-2-andriy.shevchenko@linux.intel.com>
Date: Thu, 20 Mar 2025 20:04:22 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Petr Mladek <pmladek@...e.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Kees Cook <kees@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Cc: John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Andy Shevchenko <andy@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH v1 1/6] seq_buf: Mark binary printing functions with __printf() attribute

Binary printing functions are using printf() type of format, and compiler
is not happy about them as is:

lib/seq_buf.c:162:17: error: function ‘seq_buf_bprintf’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]

Fix the compilation errors by adding __printf() attribute.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/seq_buf.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index fe41da005970..52791e070506 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -167,8 +167,8 @@ extern int seq_buf_hex_dump(struct seq_buf *s, const char *prefix_str,
 			    const void *buf, size_t len, bool ascii);
 
 #ifdef CONFIG_BINARY_PRINTF
-extern int
-seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
+__printf(2, 0)
+int seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
 #endif
 
 void seq_buf_do_printk(struct seq_buf *s, const char *lvl);
-- 
2.47.2