netdev - [PATCH bpf-next] bpf: Verify flags in bpf_fib

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Date:   Tue, 29 May 2018 11:59:13 -0700
From:   dsahern@...nel.org
To:     netdev@...r.kernel.org, borkmann@...earbox.net, ast@...nel.org
Cc:     David Ahern <dsahern@...il.com>
Subject: [PATCH bpf-next] bpf: Verify flags in bpf_fib_lookup

From: David Ahern <dsahern@...il.com>

Verify flags argument contains only known flags. Allows programs to probe
for support as more are added.

Signed-off-by: David Ahern <dsahern@...il.com>
---
 net/core/filter.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 24e6ce8be567..4cff6d9cd724 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4270,6 +4270,9 @@ BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
 	if (plen < sizeof(*params))
 		return -EINVAL;
 
+	if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
+		return -EINVAL;
+
 	switch (params->family) {
 #if IS_ENABLED(CONFIG_INET)
 	case AF_INET:
@@ -4304,6 +4307,9 @@ BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
 	if (plen < sizeof(*params))
 		return -EINVAL;
 
+	if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
+		return -EINVAL;
+
 	switch (params->family) {
 #if IS_ENABLED(CONFIG_INET)
 	case AF_INET:
-- 
2.11.0