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Message-ID: <fd9a945e-b5e6-2926-af22-e632ad2281c6@embeddedor.com>
Date: Sat, 23 Sep 2023 10:35:46 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
Philipp Zabel <p.zabel@...gutronix.de>
Cc: Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] reset: Annotate struct reset_control_array with
__counted_by
On 9/22/23 11:52, 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 reset_control_array.
> Additionally, since the element count member must be set before accessing
> the annotated flexible array member, move its initialization earlier.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Philipp Zabel <p.zabel@...gutronix.de>
> Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Thanks
--
Gustavo
> ---
> drivers/reset/core.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
> index f0a076e94118..7ece6a8e9858 100644
> --- a/drivers/reset/core.c
> +++ b/drivers/reset/core.c
> @@ -60,7 +60,7 @@ struct reset_control {
> struct reset_control_array {
> struct reset_control base;
> unsigned int num_rstcs;
> - struct reset_control *rstc[];
> + struct reset_control *rstc[] __counted_by(num_rstcs);
> };
>
> static const char *rcdev_name(struct reset_controller_dev *rcdev)
> @@ -1185,6 +1185,7 @@ of_reset_control_array_get(struct device_node *np, bool shared, bool optional,
> resets = kzalloc(struct_size(resets, rstc, num), GFP_KERNEL);
> if (!resets)
> return ERR_PTR(-ENOMEM);
> + resets->num_rstcs = num;
>
> for (i = 0; i < num; i++) {
> rstc = __of_reset_control_get(np, NULL, i, shared, optional,
> @@ -1193,7 +1194,6 @@ of_reset_control_array_get(struct device_node *np, bool shared, bool optional,
> goto err_rst;
> resets->rstc[i] = rstc;
> }
> - resets->num_rstcs = num;
> resets->base.array = true;
>
> return &resets->base;
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