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Message-Id: <20171108223020.24487-6-linux@rasmusvillemoes.dk>
Date: Wed, 8 Nov 2017 23:30:19 +0100
From: Rasmus Villemoes <linux@...musvillemoes.dk>
To: kernel-hardening@...ts.openwall.com
Cc: linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Kees Cook <keescook@...omium.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [RFC 5/6] kernel.h: implement fmtmatch() wrapper around fmtcheck()
I couldn't come up with a better name, suggestions welcome.
Some users may prefer to EINVAL rather than using the the template as a
fallback for printf'ing. fmtmatch() is simply a shorthand for
fmtcheck(a, b, c) == a.
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
include/linux/kernel.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d7c6f9a9c024..5eae5ecb590d 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -466,6 +466,13 @@ const char *_fmtcheck(const char *fmt, const char *tmpl, unsigned flags);
#define FMTCHECK_SILENT 0x01
#define FMTCHECK_NO_EXTRA_ARGS 0x02
+#define fmtmatch(fmt, tmpl, flags) _fmtmatch(fmt, "" tmpl "", flags)
+static inline bool
+_fmtmatch(const char *fmt, const char *tmpl, unsigned flags)
+{
+ return _fmtcheck(fmt, tmpl, flags) == fmt;
+}
+
extern __scanf(2, 3)
int sscanf(const char *, const char *, ...);
extern __scanf(2, 0)
--
2.11.0
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