linux-kernel - [PATCH] partitions/ibm: refactor deprecated strncpy

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Message-ID: <20230822-strncpy-block-partitions-cmdline-ibm-v1-1-154dea8f755c@google.com>
Date:   Tue, 22 Aug 2023 23:59:26 +0000
From:   Justin Stitt <justinstitt@...gle.com>
To:     Stefan Haberland <sth@...ux.ibm.com>,
        Jan Hoeppner <hoeppner@...ux.ibm.com>,
        Jens Axboe <axboe@...nel.dk>
Cc:     linux-s390@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] partitions/ibm: refactor deprecated strncpy

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

A suitable replacement is `strscpy` [2] due to the fact that it
guarantees NUL-termination on its destination buffer argument which is
_not_ the case for `strncpy`!

Link: www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings[1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
 block/partitions/ibm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/block/partitions/ibm.c b/block/partitions/ibm.c
index 403756dbd50d..e5893cf71b57 100644
--- a/block/partitions/ibm.c
+++ b/block/partitions/ibm.c
@@ -111,11 +111,11 @@ static int find_label(struct parsed_partitions *state,
 		    !strcmp(temp, "LNX1") ||
 		    !strcmp(temp, "CMS1")) {
 			if (!strcmp(temp, "VOL1")) {
-				strncpy(type, label->vol.vollbl, 4);
-				strncpy(name, label->vol.volid, 6);
+				strscpy(type, label->vol.vollbl, 4);
+				strscpy(name, label->vol.volid, 6);
 			} else {
-				strncpy(type, label->lnx.vollbl, 4);
-				strncpy(name, label->lnx.volid, 6);
+				strscpy(type, label->lnx.vollbl, 4);
+				strscpy(name, label->lnx.volid, 6);
 			}
 			EBCASC(type, 4);
 			EBCASC(name, 6);

---
base-commit: 706a741595047797872e669b3101429ab8d378ef
change-id: 20230822-strncpy-block-partitions-cmdline-ibm-7f5bcca507ea

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