From 59b418c7063d30e0a3e1f592d47df096db83185c Mon Sep 17 00:00:00 2001 From: Anton Protopopov Date: Tue, 26 Mar 2024 10:17:42 +0000 Subject: [PATCH] bpf: Add a check for struct bpf_fib_lookup size The struct bpf_fib_lookup should not grow outside of its 64 bytes. Add a static assert to validate this. Suggested-by: David Ahern Signed-off-by: Anton Protopopov Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20240326101742.17421-4-aspsk@isovalent.com Signed-off-by: Alexei Starovoitov --- net/core/filter.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/core/filter.c b/net/core/filter.c index 1205dd777dc2f..786d792ac8161 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -87,6 +87,9 @@ #include "dev.h" +/* Keep the struct bpf_fib_lookup small so that it fits into a cacheline */ +static_assert(sizeof(struct bpf_fib_lookup) == 64, "struct bpf_fib_lookup size check"); + static const struct bpf_func_proto * bpf_sk_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog); -- 2.30.2