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Bottomley" , "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Tue, 24 Oct 2023 12:52:44 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1780667819895913682 X-GMAIL-MSGID: 1780667819895913682 strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. We expect `mode` to be NUL-terminated based on its usage with strcasecmp(): | ctlr->mode = fcoe_parse_mode(mode); ... | static enum fip_conn_type fcoe_parse_mode(const char *buf) | { | int i; | | for (i = 0; i < ARRAY_SIZE(fip_conn_type_names); i++) { | if (strcasecmp(buf, fip_conn_type_names[i]) == 0) | return i; | } | | return FIP_CONN_TYPE_UNKNOWN; | } Considering the above, a suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. We can drop the manual NUL-byte assignment but should keep the newline removal so newlines don't creep into the string. Link: https://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@vger.kernel.org Signed-off-by: Justin Stitt --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/scsi/fcoe/fcoe_sysfs.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- base-commit: d88520ad73b79e71e3ddf08de335b8520ae41c5c change-id: 20231024-strncpy-drivers-scsi-fcoe-fcoe_sysfs-c-0e1dffe82855 Best regards, -- Justin Stitt diff --git a/drivers/scsi/fcoe/fcoe_sysfs.c b/drivers/scsi/fcoe/fcoe_sysfs.c index e17957f8085c..7a3ca6cd3030 100644 --- a/drivers/scsi/fcoe/fcoe_sysfs.c +++ b/drivers/scsi/fcoe/fcoe_sysfs.c @@ -279,12 +279,10 @@ static ssize_t store_ctlr_mode(struct device *dev, if (count > FCOE_MAX_MODENAME_LEN) return -EINVAL; - strncpy(mode, buf, count); + strscpy(mode, buf, count); if (mode[count - 1] == '\n') mode[count - 1] = '\0'; - else - mode[count] = '\0'; switch (ctlr->enabled) { case FCOE_CTLR_ENABLED: