bpf: add verifier tests for BPF_PROG_TYPE_SK_MSG

Test read and writes for BPF_PROG_TYPE_SK_MSG.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 86d7ff491b6fbff5824d10bea0f79e4a3bcd6748..3e7718b1a9ae49c176a407d9f14ad31704255701 100644 (file)
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -1596,6 +1596,60 @@ static struct bpf_test tests[] = {
                .result = ACCEPT,
                .prog_type = BPF_PROG_TYPE_SK_SKB,
        },
+       {
+               "direct packet read for SK_MSG",
+               .insns = {
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1,
+                                   offsetof(struct sk_msg_md, data)),
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_1,
+                                   offsetof(struct sk_msg_md, data_end)),
+                       BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
+                       BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
+                       BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_2, 0),
+                       BPF_MOV64_IMM(BPF_REG_0, 0),
+                       BPF_EXIT_INSN(),
+               },
+               .result = ACCEPT,
+               .prog_type = BPF_PROG_TYPE_SK_MSG,
+       },
+       {
+               "direct packet write for SK_MSG",
+               .insns = {
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1,
+                                   offsetof(struct sk_msg_md, data)),
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_1,
+                                   offsetof(struct sk_msg_md, data_end)),
+                       BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
+                       BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
+                       BPF_STX_MEM(BPF_B, BPF_REG_2, BPF_REG_2, 0),
+                       BPF_MOV64_IMM(BPF_REG_0, 0),
+                       BPF_EXIT_INSN(),
+               },
+               .result = ACCEPT,
+               .prog_type = BPF_PROG_TYPE_SK_MSG,
+       },
+       {
+               "overlapping checks for direct packet access SK_MSG",
+               .insns = {
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_1,
+                                   offsetof(struct sk_msg_md, data)),
+                       BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_1,
+                                   offsetof(struct sk_msg_md, data_end)),
+                       BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
+                       BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 4),
+                       BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),
+                       BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 6),
+                       BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_3, 1),
+                       BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_2, 6),
+                       BPF_MOV64_IMM(BPF_REG_0, 0),
+                       BPF_EXIT_INSN(),
+               },
+               .result = ACCEPT,
+               .prog_type = BPF_PROG_TYPE_SK_MSG,
+       },
        {
                "check skb->mark is not writeable by sockets",
                .insns = {