On Mon, Oct 30, 2023 at 08:40:48PM +0000, Justin Stitt wrote: > 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 partition_name to be NUL-terminated based on its usage with > format strings: > | dev_info(hostdata->dev, "host srp version: %s, " > | "host partition %s (%d), OS %d, max io %u\n", > | hostdata->madapter_info.srp_version, > | hostdata->madapter_info.partition_name, > | be32_to_cpu(hostdata->madapter_info.partition_number), > | be32_to_cpu(hostdata->madapter_info.os_type), > | be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); > ... > | len = snprintf(buf, PAGE_SIZE, "%s\n", > | hostdata->madapter_info.partition_name); > > Moreover, NUL-padding is not required as madapter_info is explicitly > memset to 0: > | memset(&hostdata->madapter_info, 0x00, > | sizeof(hostdata->madapter_info)); > > 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. > > 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@xxxxxxxxxxxxxxx > Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx> Agreed; this conversion looks correct to me too. Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -- Kees Cook
