On Tue, Oct 03, 2023 at 09:01:58PM +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. > > A suitable replacement is `strscpy` [2] due to the fact that it > guarantees NUL-termination on the destination buffer without > unnecessarily NUL-padding. > > Furthermore, let's make sure `hid->xyz` and `ev->u.create2.xyz` are the > same size at compile time to prevent silent truncation. > > With these changes, it is abundantly clear what the intent and behavior > of the code is -- We are getting a string to string copy with > NUL-termination and no truncation. > > 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 > Cc: Kees Cook <keescook@xxxxxxxxxxxx> > Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx> Great! This looks much simpler to me. Thanks for adjusting it. Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -- Kees Cook
