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bpf: Add a check for struct bpf_fib_lookup size

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[ Upstream commit 59b418c7063d30e0a3e1f592d47df096db83185c ]

The struct bpf_fib_lookup should not grow outside of its 64 bytes.
Add a static assert to validate this.

Suggested-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240326101742.17421-4-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Anton Protopopov
2024-03-26 10:17:42 +00:00
committed by Greg Kroah-Hartman
parent cc33a7a2f1
commit 5bcb9cf62f
1 changed files with 3 additions and 0 deletions
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3
net/core/filter.c
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@@ -82,6 +82,9 @@
#include <net/mptcp.h>
#include <net/netfilter/nf_conntrack_bpf.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);