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Commit 1acc60b6 authored by John Fastabend's avatar John Fastabend Committed by Daniel Borkmann
Browse files

bpf: add verifier tests for BPF_PROG_TYPE_SK_MSG 



Test read and writes for BPF_PROG_TYPE_SK_MSG.

Signed-off-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 82a86168

tools/testing/selftests/bpf/test_verifier.c

+54 −0
Original line number Diff line number Diff line
@@ -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 = {