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Message-Id: <20231003231740.work.413-kees@kernel.org> Date: Tue, 3 Oct 2023 16:17:41 -0700 From: Kees Cook <keescook@...omium.org> To: "David S. Miller" <davem@...emloft.net> Cc: Kees Cook <keescook@...omium.org>, 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: [PATCH] net/packet: Annotate struct packet_fanout with __counted_by 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> --- 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 { -- 2.34.1
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