linux-hardening - Re: [PATCH][next] wifi: brcmfmac: fweh: Add __counted_by for struct brcmf_fweh_queue_item and use struct

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Date: Tue, 10 Oct 2023 16:26:25 +0200
From: Arend Van Spriel <arend.vanspriel@...adcom.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>, Arend van Spriel <aspriel@...il.com>, Franky Lin <franky.lin@...adcom.com>, Hante Meuleman <hante.meuleman@...adcom.com>, Kalle Valo <kvalo@...nel.org>
CC: <linux-wireless@...r.kernel.org>, <brcm80211-dev-list.pdl@...adcom.com>, <SHA-cyfmac-dev-list@...ineon.com>, <linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH][next] wifi: brcmfmac: fweh: Add __counted_by for struct brcmf_fweh_queue_item and use struct_size()

On October 9, 2023 11:42:11 PM "Gustavo A. R. Silva" 
<gustavoars@...nel.org> 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 via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> Also, relocate `event->datalen = datalen;` to before calling
> `memcpy(event->data, data, datalen);`, so that the __counted_by
> annotation has effect, and flex-array member `data` can be properly
> bounds-checked at run-time.
>
> While there, use struct_size() helper, instead of the open-coded
> version, to calculate the size for the allocation of the whole
> flexible structure, including of course, the flexible-array member.
>
> This code was found with the help of Coccinelle, and audited and
> fixed manually.

>From the description above I think this change looks sane so...

Acked-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)

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