On Wed, Oct 11, 2023 at 09:04:37PM +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 `dst` to be NUL-terminated based on its use with format > strings: > | mlx4_dbg(dev, "Reporting Driver Version to FW: %s\n", dst); > > Moreover, NUL-padding is not required. Yup, since it's only use is for the above report. > > 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> Thanks! Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -- Kees Cook
