soc: fsl: qe: 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>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230523021425.2406309-1-azeemshaikh38@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>

diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
index b3c226e..58746e5 100644 (file)
--- a/drivers/soc/fsl/qe/qe.c
+++ b/drivers/soc/fsl/qe/qe.c
@@ -524,7 +524,7 @@ int qe_upload_firmware(const struct qe_firmware *firmware)
         * saved microcode information and put in the new.
         */
        memset(&qe_firmware_info, 0, sizeof(qe_firmware_info));
-       strlcpy(qe_firmware_info.id, firmware->id, sizeof(qe_firmware_info.id));
+       strscpy(qe_firmware_info.id, firmware->id, sizeof(qe_firmware_info.id));
        qe_firmware_info.extended_modes = be64_to_cpu(firmware->extended_modes);
        memcpy(qe_firmware_info.vtraps, firmware->vtraps,
                sizeof(firmware->vtraps));
@@ -599,7 +599,7 @@ struct qe_firmware_info *qe_get_firmware_info(void)
        /* Copy the data into qe_firmware_info*/
        sprop = of_get_property(fw, "id", NULL);
        if (sprop)
-               strlcpy(qe_firmware_info.id, sprop,
+               strscpy(qe_firmware_info.id, sprop,
                        sizeof(qe_firmware_info.id));
 
        of_property_read_u64(fw, "extended-modes",