On Thu, Sep 14, 2023 at 06:20:01PM +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. > > A suitable replacement is `strscpy` [2] due to the fact that it guarantees > NUL-termination on the destination buffer. > > 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: Bo YU <tsu.yubo@xxxxxxxxx> > Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx> > --- > Similar to [1] which was never picked up. Let's prefer strscpy to strlcpy, though > > [1]: https://lore.kernel.org/all/20190328080918.9290-1-tsu.yubo@xxxxxxxxx/ > --- > drivers/gpu/drm/etnaviv/etnaviv_perfmon.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c > index bafdfe49c1d8..9e7bebcf24eb 100644 > --- a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c > +++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c > @@ -511,7 +511,7 @@ int etnaviv_pm_query_dom(struct etnaviv_gpu *gpu, > > domain->id = domain->iter; > domain->nr_signals = dom->nr_signals; > - strncpy(domain->name, dom->name, sizeof(domain->name)); > + strscpy(domain->name, dom->name, sizeof(domain->name)); It looks like this is passing through an ioctl(). Let's use strscpy_pad(0 instead... -Kees > > domain->iter++; > if (domain->iter == nr_domains) > @@ -540,7 +540,7 @@ int etnaviv_pm_query_sig(struct etnaviv_gpu *gpu, > sig = &dom->signal[signal->iter]; > > signal->id = signal->iter; > - strncpy(signal->name, sig->name, sizeof(signal->name)); > + strscpy(signal->name, sig->name, sizeof(signal->name)); > > signal->iter++; > if (signal->iter == dom->nr_signals) > > --- > base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec > change-id: 20230914-strncpy-drivers-gpu-drm-etnaviv-etnaviv_perfmon-c-dd095491dfde > > Best regards, > -- > Justin Stitt <justinstitt@xxxxxxxxxx> > -- Kees Cook
