[PATCH 5.10 231/290] bpf: Add a check for struct bpf_fib_lookup size

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anton Protopopov <aspsk@xxxxxxxxxxxxx>

[ 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@xxxxxxxxxx>
Signed-off-by: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20240326101742.17421-4-aspsk@xxxxxxxxxxxxx
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/core/filter.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 49e4d1535cc82..a3101cdfd47b9 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -78,6 +78,9 @@
 #include <linux/btf_ids.h>
 #include <net/tls.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);
 
-- 
2.43.0







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