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Message-ID: <20230823-strncpy-block-partitions-cmdline-ibm-v2-1-40c77f7182fc@google.com>
Date: Wed, 23 Aug 2023 21:24:22 +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: Kees Cook <keescook@...omium.org>, 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 v2] partitions/ibm: refactor deprecated strncpy
`strncpy` is deprecated [1] and we should favor different interfaces.
A suitable replacement is `strtomem_pad` as it is a more robust and less
ambiguous interface. In this case, the destination buffer is not
necessarily NUL-terminated as Heiko points out [2]. Using `strtomem_pad`
over strncpy means it is now more obvious what is expected of the
destination buffer: 1) Not necessarily NUL-terminated and 2) padded with
NUL-bytes
Link: www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings[1]
Link: https://lore.kernel.org/all/20230823134936.14378-E-hca@linux.ibm.com/ [2]
Link: https://github.com/KSPP/linux/issues/90
Suggested-by: Kees Cook <keescook@...omium.org>
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
Changes in v2:
- prefer `strtomem_pad` over `strscpy` (thanks Kees)
- Link to v1: https://lore.kernel.org/r/20230822-strncpy-block-partitions-cmdline-ibm-v1-1-154dea8f755c@google.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..56c076c5523d 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);
+ strtomem_pad(type, label->vol.vollbl, 4);
+ strtomem_pad(name, label->vol.volid, 6);
} else {
- strncpy(type, label->lnx.vollbl, 4);
- strncpy(name, label->lnx.volid, 6);
+ strtomem_pad(type, label->lnx.vollbl, 4);
+ strtomem_pad(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>
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