Messages in this thread | | | Date | Wed, 4 Oct 2023 01:34:37 +0200 | Subject | Re: [PATCH] net/packet: Annotate struct packet_fanout with __counted_by | From | "Gustavo A. R. Silva" <> |
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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@davemloft.net> > Cc: Eric Dumazet <edumazet@google.com> > Cc: Jakub Kicinski <kuba@kernel.org> > Cc: Paolo Abeni <pabeni@redhat.com> > Cc: Willem de Bruijn <willemb@google.com> > Cc: Anqi Shen <amy.saq@antgroup.com> > Cc: netdev@vger.kernel.org > Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] > Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.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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