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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id 13-20020a170902c10d00b001bc68602e54sm4343643pli.142.2023.10.06.13.23.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Oct 2023 13:23:58 -0700 (PDT) Date: Fri, 6 Oct 2023 13:23:56 -0700 From: Kees Cook To: Justin Stitt Cc: Lucas Stach , Russell King , Christian Gmeiner , David Airlie , Daniel Vetter , etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Bo YU Subject: Re: [PATCH v2] drm/etnaviv: refactor deprecated strncpy Message-ID: <202310061323.05B262D@keescook> References: <20230918-strncpy-drivers-gpu-drm-etnaviv-etnaviv_perfmon-c-v2-1-8ae12071c138@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230918-strncpy-drivers-gpu-drm-etnaviv-etnaviv_perfmon-c-v2-1-8ae12071c138@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 18, 2023 at 01:34:08PM +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_pad` due to the fact that it > guarantees NUL-termination on the destination buffer whilst maintaining > the NUL-padding behavior that strncpy provides. Friend ping. Who can pick this change up? Thanks! -Kees > > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] > Link: https://github.com/KSPP/linux/issues/90 > Cc: linux-hardening@vger.kernel.org > Cc: Bo YU > Signed-off-by: Justin Stitt > --- > Changes in v2: > - use strscpy_pad (thanks Kees) > - Link to v1: https://lore.kernel.org/r/20230914-strncpy-drivers-gpu-drm-etnaviv-etnaviv_perfmon-c-v1-1-3adc2d9bfc52@google.com > --- > Similar to [2] which was never picked up. Let's prefer strscpy_pad to strlcpy, though > > [2]: https://lore.kernel.org/all/20190328080918.9290-1-tsu.yubo@gmail.com/ > --- > 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..dc9dea664a28 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_pad(domain->name, dom->name, sizeof(domain->name)); > > 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_pad(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 > -- Kees Cook