linux-kernel - Re: [PATCH] accel/ivpu: Annotate struct ivpu_job with __counted

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Date:   Mon, 25 Sep 2023 13:03:52 +0200
From:   Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
        Oded Gabbay <ogabbay@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, dri-devel@...ts.freedesktop.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] accel/ivpu: Annotate struct ivpu_job with __counted_by

On Fri, Sep 22, 2023 at 10:54:17AM -0700, 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 ivpu_job.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>
> Cc: Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>
> Cc: Oded Gabbay <ogabbay@...nel.org>
> Cc: Nathan Chancellor <nathan@...nel.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Tom Rix <trix@...hat.com>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: llvm@...ts.linux.dev
> Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>

Please apply the patch via whatever tree is appropriate. Or if I have
to take it via drm-misc, please let me know.

Regards
Stanislaw

> ---
>  drivers/accel/ivpu/ivpu_job.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/accel/ivpu/ivpu_job.h b/drivers/accel/ivpu/ivpu_job.h
> index aa1f0b9479b0..5514c2d8a609 100644
> --- a/drivers/accel/ivpu/ivpu_job.h
> +++ b/drivers/accel/ivpu/ivpu_job.h
> @@ -51,7 +51,7 @@ struct ivpu_job {
>  	u32 job_id;
>  	u32 engine_idx;
>  	size_t bo_count;
> -	struct ivpu_bo *bos[];
> +	struct ivpu_bo *bos[] __counted_by(bo_count);
>  };
>  
>  int ivpu_submit_ioctl(struct drm_device *dev, void *data, struct drm_file *file);
> -- 
> 2.34.1
>