On Thu, Oct 19, 2023 at 10:47:58PM +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 know dev->name should be NUL-terminated based on the presence of a > manual NUL-byte assignment. > > NUL-padding is not required as dev is already zero-allocated which > renders any further NUL-byte assignments redundant: > dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid); ---> > dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL); > > 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. This simplifies the code and makes > the intent/behavior more obvious. > > 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> Looks clean to me! Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -- Kees Cook
