Re: [PATCH 10/64] lib80211: Use struct_group() for memcpy() region

Greg Kroah-Hartman
2021-07-28T05:52:20Z

On Tue, Jul 27, 2021 at 01:58:01PM -0700, 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
> ieee80211_hdr 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.
>
> "pahole" shows no size nor member offset changes to struct ieee80211_hdr.
> "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>
> ---
> drivers/staging/rtl8723bs/core/rtw_security.c | 5 +++--
> drivers/staging/rtl8723bs/core/rtw_xmit.c | 5 +++--
> include/linux/ieee80211.h | 8 +++++---
> net/wireless/lib80211_crypt_ccmp.c | 3 ++-
> 4 files changed, 13 insertions(+), 8 deletions(-)

For the staging portion:

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>