linux-kernel - [PATCH] s390/ipl: refactor deprecated strncpy

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Date:   Fri, 11 Aug 2023 21:56:15 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org,
        Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] s390/ipl: refactor deprecated strncpy

`strncpy` is deprecated for use on NUL-terminated destination strings [1].

Use `strscpy_pad` which has the same behavior as `strncpy` here with the
extra safeguard of guaranteeing NUL-termination of destination strings.
In it's current form, this may result in silent truncation if the src
string has the same size as the destination string.

Link: www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings[1]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
 arch/s390/kernel/ipl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 85a00d97a314..a6dcf6f28197 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -266,7 +266,7 @@ static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,	\
 		struct kobj_attribute *attr,				\
 		const char *buf, size_t len)				\
 {									\
-	strncpy(_value, buf, sizeof(_value) - 1);			\
+	strscpy_pad(_value, buf, sizeof(_value));			\
 	strim(_value);							\
 	return len;							\
 }									\

---
base-commit: 52a93d39b17dc7eb98b6aa3edb93943248e03b2f
change-id: 20230811-arch-s390-kernel-968d0545c45a

Best regards,
--
Justin Stitt <justinstitt@...gle.com>