linux-kernel - [PATCH 1/7] bug: Refactor away warn_slowpath_fmt

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Date:   Mon, 19 Aug 2019 16:41:05 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Drew Davenport <ddavenport@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Feng Tang <feng.tang@...el.com>,
        Petr Mladek <pmladek@...e.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        YueHaibing <yuehaibing@...wei.com>, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] bug: Refactor away warn_slowpath_fmt_taint()

There's no reason to have specialized helpers for passing the warn
taint down to __warn(). Consolidate and refactor helper macros, removing
__WARN_printf() and warn_slowpath_fmt_taint().

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/asm-generic/bug.h | 13 ++++---------
 kernel/panic.c            | 18 +++---------------
 2 files changed, 7 insertions(+), 24 deletions(-)

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index aa6c093d9ce9..ce466432ac3e 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -90,24 +90,19 @@ struct bug_entry {
  * Use the versions with printk format strings to provide better diagnostics.
  */
 #ifndef __WARN_TAINT
-extern __printf(3, 4)
-void warn_slowpath_fmt(const char *file, const int line,
-		       const char *fmt, ...);
 extern __printf(4, 5)
-void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint,
-			     const char *fmt, ...);
+void warn_slowpath_fmt(const char *file, const int line, unsigned taint,
+		       const char *fmt, ...);
 extern void warn_slowpath_null(const char *file, const int line);
 #define WANT_WARN_ON_SLOWPATH
 #define __WARN()		warn_slowpath_null(__FILE__, __LINE__)
-#define __WARN_printf(arg...)	warn_slowpath_fmt(__FILE__, __LINE__, arg)
 #define __WARN_printf_taint(taint, arg...)				\
-	warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
+	warn_slowpath_fmt(__FILE__, __LINE__, taint, arg)
 #else
 extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
 #define __WARN() do { \
 	printk(KERN_WARNING CUT_HERE); __WARN_TAINT(TAINT_WARN); \
 } while (0)
-#define __WARN_printf(arg...)	__WARN_printf_taint(TAINT_WARN, arg)
 #define __WARN_printf_taint(taint, arg...)				\
 	do { __warn_printk(arg); __WARN_TAINT(taint); } while (0)
 #endif
@@ -132,7 +127,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 #define WARN(condition, format...) ({					\
 	int __ret_warn_on = !!(condition);				\
 	if (unlikely(__ret_warn_on))					\
-		__WARN_printf(format);					\
+		__WARN_printf_taint(TAINT_WARN, format);		\
 	unlikely(__ret_warn_on);					\
 })
 #endif
diff --git a/kernel/panic.c b/kernel/panic.c
index 057540b6eee9..4d8b7577c82c 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -592,20 +592,8 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 }
 
 #ifdef WANT_WARN_ON_SLOWPATH
-void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
-{
-	struct warn_args args;
-
-	args.fmt = fmt;
-	va_start(args.args, fmt);
-	__warn(file, line, __builtin_return_address(0), TAINT_WARN, NULL,
-	       &args);
-	va_end(args.args);
-}
-EXPORT_SYMBOL(warn_slowpath_fmt);
-
-void warn_slowpath_fmt_taint(const char *file, int line,
-			     unsigned taint, const char *fmt, ...)
+void warn_slowpath_fmt(const char *file, int line, unsigned taint,
+		       const char *fmt, ...)
 {
 	struct warn_args args;
 
@@ -614,7 +602,7 @@ void warn_slowpath_fmt_taint(const char *file, int line,
 	__warn(file, line, __builtin_return_address(0), taint, NULL, &args);
 	va_end(args.args);
 }
-EXPORT_SYMBOL(warn_slowpath_fmt_taint);
+EXPORT_SYMBOL(warn_slowpath_fmt);
 
 void warn_slowpath_null(const char *file, int line)
 {
-- 
2.17.1