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Message-ID: <44a4a0fa-0e26-f485-d3fc-54c892b2de3c@embeddedor.com>
Date: Wed, 4 Oct 2023 01:34:37 +0200
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
"David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Willem de Bruijn <willemb@...gle.com>,
Anqi Shen <amy.saq@...group.com>, netdev@...r.kernel.org,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, syzbot <syzkaller@...glegroups.com>,
Jianfeng Tan <henry.tjf@...group.com>,
linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
llvm@...ts.linux.dev
Subject: Re: [PATCH] net/packet: Annotate struct packet_fanout with
__counted_by
On 10/4/23 01:17, 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 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 packet_fanout.
>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: Willem de Bruijn <willemb@...gle.com>
> Cc: Anqi Shen <amy.saq@...group.com>
> Cc: netdev@...r.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Thanks
--
Gustavo
> ---
> net/packet/internal.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/packet/internal.h b/net/packet/internal.h
> index 63f4865202c1..d29c94c45159 100644
> --- a/net/packet/internal.h
> +++ b/net/packet/internal.h
> @@ -94,7 +94,7 @@ struct packet_fanout {
> spinlock_t lock;
> refcount_t sk_ref;
> struct packet_type prot_hook ____cacheline_aligned_in_smp;
> - struct sock __rcu *arr[];
> + struct sock __rcu *arr[] __counted_by(max_num_members);
> };
>
> struct packet_rollover {
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