isdn: replace deprecated strncpy with strscpy

`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 `iclock->name` to be NUL-terminated based on its use within
printk:
|	printk(KERN_DEBUG "%s: %s %d\n", __func__, iclock->name,
|	       iclock->pri);

`iclock` is zero-initialized and as such is already NUL-padded which
means strncpy is doing extra work here by eagerly NUL-padding the
destination buffer.

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
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230922-strncpy-drivers-isdn-misdn-clock-c-v1-1-3ba2a5ae627a@google.com
Signed-off-by: Kees Cook <keescook@chromium.org>

diff --git a/drivers/isdn/mISDN/clock.c b/drivers/isdn/mISDN/clock.c
index 01d878168ef27668a69dab4d699499421ea9f33e..f71eb61db1313e9721cea365d12494df555902d4 100644 (file)
--- a/drivers/isdn/mISDN/clock.c
+++ b/drivers/isdn/mISDN/clock.c
@@ -96,7 +96,7 @@ struct mISDNclock
                printk(KERN_ERR "%s: No memory for clock entry.\n", __func__);
                return NULL;
        }
-       strncpy(iclock->name, name, sizeof(iclock->name) - 1);
+       strscpy(iclock->name, name, sizeof(iclock->name));
        iclock->pri = pri;
        iclock->priv = priv;
        iclock->ctl = ctl;