From: Kees Cook <keescook@chromium.org>
To: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Johannes Berg <johannes@sipsolutions.net>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] wifi: mac80211: Add __counted_by for struct ieee802_11_elems and use struct_size()
Date: Mon, 9 Oct 2023 12:57:49 -0700 [thread overview]
Message-ID: <202310091257.6613605D5@keescook> (raw)
In-Reply-To: <ZSQ/jcmTAf/PKHg/@work>
On Mon, Oct 09, 2023 at 11:59:41AM -0600, Gustavo A. R. Silva 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).
>
> 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.
>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Looks correct: "scratch" isn't accessed before setting "scratch_len".
Reviewed-by: Kees Cook <keescook@chromium.org>
-Kees
--
Kees Cook
prev parent reply other threads:[~2023-10-09 19:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-09 17:59 [PATCH][next] wifi: mac80211: Add __counted_by for struct ieee802_11_elems and use struct_size() Gustavo A. R. Silva
2023-10-09 19:57 ` Kees Cook [this message]
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