linux-hardening - [PATCH] fortify: Use __struct_size replace __member

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Message-Id: <20241204064149.218136-1-15074444048@163.com>
Date: Wed,  4 Dec 2024 14:41:49 +0800
From: 15074444048@....com
To: linux-hardening@...r.kernel.org,
	kees@...nel.org
Cc: 15074444048@....com,
	lihaojie <lihaojie@...inos.cn>
Subject: [PATCH] fortify: Use __struct_size replace __member_size

From: lihaojie <lihaojie@...inos.cn>

Use __struct_size get destination size.

Size of destination less of the size to be written will
make buffer overflow, the size of destination should be
complete.

Signed-off-by: lihaojie <lihaojie@...inos.cn>
---
 include/linux/fortify-string.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h
index 0d99bf11d260..0504b2c8aab7 100644
--- a/include/linux/fortify-string.h
+++ b/include/linux/fortify-string.h
@@ -277,7 +277,7 @@ extern ssize_t __real_strscpy(char *, const char *, size_t) __RENAME(sized_strsc
 __FORTIFY_INLINE ssize_t sized_strscpy(char * const POS p, const char * const POS q, size_t size)
 {
 	/* Use string size rather than possible enclosing struct size. */
-	const size_t p_size = __member_size(p);
+	const size_t p_size = __struct_size(p);
 	const size_t q_size = __member_size(q);
 	size_t len;
 
-- 
2.25.1