On Tue, Oct 03, 2023 at 10:15:45PM +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. > > The only caller of mptsas_exp_repmanufacture_info() is > mptsas_probe_one_phy() which can allocate rphy in either > sas_end_device_alloc() or sas_expander_alloc(). Both of which > zero-allocate: > | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); > ... this is supplied to mptsas_exp_repmanufacture_info() as edev meaning > that no future NUL-padding of edev members is needed. > > 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. > > Also use the more idiomatic strscpy pattern of (dest, src, sizeof(dest)) > > 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> Thanks for adjusting the sizes. Looks good! Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -- Kees Cook
