linux-hardening - Re: [PATCH] usb: Annotate struct urb_priv with __counted

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Message-ID: <2023100246-stem-overcoat-c4b8@gregkh>
Date: Mon, 2 Oct 2023 13:42:01 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Kees Cook <keescook@...omium.org>
Cc: Alan Stern <stern@...land.harvard.edu>,
	Mathias Nyman <mathias.nyman@...el.com>, linux-usb@...r.kernel.org,
	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] usb: Annotate struct urb_priv with __counted_by

On Fri, Sep 15, 2023 at 12:58:16PM -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 urb_priv.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Mathias Nyman <mathias.nyman@...el.com>
> Cc: linux-usb@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/usb/host/ohci.h | 2 +-
>  drivers/usb/host/xhci.h | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Thanks for taking these changes through your tree, I was too slow...

greg k-h