scsi: ibmvscsi: Replace all non-returning strlcpy with strscpy

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Acked-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230517143409.1520298-1-azeemshaikh38@gmail.com

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 63f32f8..5959929 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -250,7 +250,7 @@ static void gather_partition_info(void)
 
        ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
        if (ppartition_name)
-               strlcpy(partition_name, ppartition_name,
+               strscpy(partition_name, ppartition_name,
                                sizeof(partition_name));
        p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
        if (p_number_ptr)
@@ -1282,12 +1282,12 @@ static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
        if (hostdata->client_migrated)
                hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
 
-       strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
+       strscpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
                sizeof(hostdata->caps.name));
 
        location = of_get_property(of_node, "ibm,loc-code", NULL);
        location = location ? location : dev_name(hostdata->dev);
-       strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
+       strscpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
 
        req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
        req->buffer = cpu_to_be64(hostdata->caps_addr);