Re: [PATCH 07/64] staging: rtl8192e: Use struct_group() for memcpy() region

Larry Finger
2021-07-27T22:30:54Z

On 7/27/21 3:57 PM, Kees Cook wrote:
> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memcpy(), memmove(), and memset(), avoid
> intentionally writing across neighboring fields.
>
> Use struct_group() around members addr1, addr2, and addr3 in struct
> rtllib_hdr_4addr, and members qui, qui_type, qui_subtype, version,
> and ac_info in struct rtllib_qos_information_element, so they can be
> referenced together. This will allow memcpy() and sizeof() to more easily
> reason about sizes, improve readability, and avoid future warnings about
> writing beyond the end of addr1 and qui.
>
> "pahole" shows no size nor member offset changes to struct
> rtllib_hdr_4addr nor struct rtllib_qos_information_element. "objdump -d"
> shows no meaningful object code changes (i.e. only source line number
> induced differences and optimizations).
>
> Signed-off-by: Kees Cook<keescook@chromium.org>

Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>

Looks good.

Larry