On Wed, Sep 20, 2023 at 08:08:52AM +0000, Justin Stitt wrote: > `strncpy` is deprecated for use on NUL-terminated destination strings [1]. > > We should prefer more robust and less ambiguous string interfaces. > > We expect name to be NUL-terminated based on its numerous uses with > functions that expect NUL-terminated strings. > > For example in i2c-core-base.c +1533: > | dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); > > NUL-padding is not required as `adap` is already zero-alloacted with: > | adap = devm_kzalloc(&usbif->dev, sizeof(struct i2c_adapter), GFP_KERNEL); > > With the above in mind, 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 for the clear commit log! Looks good to me. Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -- Kees Cook
