From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Kees Cook <keescook@chromium.org>,
Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Nicolas Pitre <npitre@baylibre.com>,
Len Baker <len.baker@gmx.com>,
Boris Brezillon <boris.brezillon@collabora.com>,
linux-i3c@lists.infradead.org,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Tom Rix <trix@redhat.com>,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH] i3c/master/mipi-i3c-hci: Annotate struct hci_rings_data with __counted_by
Date: Sat, 23 Sep 2023 10:28:52 -0600 [thread overview]
Message-ID: <9ae58a8a-04c1-90ac-cf50-7366bff42084@embeddedor.com> (raw)
In-Reply-To: <20230922175019.work.129-kees@kernel.org>
On 9/22/23 11:50, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct hci_rings_data.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
> Cc: Nicolas Pitre <npitre@baylibre.com>
> Cc: Len Baker <len.baker@gmx.com>
> Cc: Boris Brezillon <boris.brezillon@collabora.com>
> Cc: linux-i3c@lists.infradead.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Thanks
--
Gustavo
> ---
> drivers/i3c/master/mipi-i3c-hci/dma.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c
> index 2990ac9eaade..a1ecdfc35641 100644
> --- a/drivers/i3c/master/mipi-i3c-hci/dma.c
> +++ b/drivers/i3c/master/mipi-i3c-hci/dma.c
> @@ -139,7 +139,7 @@ struct hci_rh_data {
>
> struct hci_rings_data {
> unsigned int total;
> - struct hci_rh_data headers[];
> + struct hci_rh_data headers[] __counted_by(total);
> };
>
> struct hci_dma_dev_ibi_data {
--
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next prev parent reply other threads:[~2023-09-23 8:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-22 17:50 [PATCH] i3c/master/mipi-i3c-hci: Annotate struct hci_rings_data with __counted_by Kees Cook
2023-09-23 16:28 ` Gustavo A. R. Silva [this message]
2023-09-25 21:37 ` Alexandre Belloni
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