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From:   Kees Cook <keescook@chromium.org>
To:     linux-kernel@vger.kernel.org
Cc:     Kees Cook <keescook@chromium.org>,
        Francis Laniel <laniel_francis@privacyrequired.com>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Daniel Micay <danielmicay@gmail.com>,
        Bart Van Assche <bvanassche@acm.org>,
        David Gow <davidgow@google.com>, linux-mm@kvack.org,
        clang-built-linux@googlegroups.com, linux-hardening@vger.kernel.org
Subject: [PATCH for-next 18/25] fortify: Prepare to improve strnlen() and strlen() warnings
Date:   Sun, 22 Aug 2021 00:51:15 -0700
Message-Id: <20210822075122.864511-19-keescook@chromium.org>
In-Reply-To: <20210822075122.864511-1-keescook@chromium.org>
References: <20210822075122.864511-1-keescook@chromium.org>
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In order to have strlen() use fortified strnlen() internally, swap their
positions in the source. Doing this as part of later changes makes
review difficult, so reoroder it here; no code changes.

Cc: Francis Laniel <laniel_francis@privacyrequired.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 include/linux/fortify-string.h | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h
index 68bc5978d916..a3cb1d9aacce 100644
--- a/include/linux/fortify-string.h
+++ b/include/linux/fortify-string.h
@@ -56,6 +56,17 @@ __FORTIFY_INLINE char *strcat(char *p, const char *q)
 	return p;
 }
 
+extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen);
+__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
+{
+	size_t p_size = __builtin_object_size(p, 1);
+	__kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size);
+
+	if (p_size <= ret && maxlen != ret)
+		fortify_panic(__func__);
+	return ret;
+}
+
 __FORTIFY_INLINE __kernel_size_t strlen(const char *p)
 {
 	__kernel_size_t ret;
@@ -71,17 +82,6 @@ __FORTIFY_INLINE __kernel_size_t strlen(const char *p)
 	return ret;
 }
 
-extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen);
-__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
-{
-	size_t p_size = __builtin_object_size(p, 1);
-	__kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size);
-
-	if (p_size <= ret && maxlen != ret)
-		fortify_panic(__func__);
-	return ret;
-}
-
 /* defined after fortified strlen to reuse it */
 extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy);
 __FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size)
-- 
2.30.2