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Commit b37242c7 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

bpf: add test cases to bpf selftests to cover all access tests 



Lets add test cases to cover really all possible direct packet
access tests for good/bad access cases so we keep tracking them.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0fd4759c

tools/testing/selftests/bpf/test_verifier.c

+480 −0
Original line number Diff line number Diff line
@@ -6671,6 +6671,486 @@ static struct bpf_test tests[] = { 
		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"XDP pkt read, pkt_end mangling, bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_end mangling, bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_ALU64_IMM(BPF_SUB, BPF_REG_3, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_data' > pkt_end, good access",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_data' > pkt_end, bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -4),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_data' > pkt_end, bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_3, 0),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_end > pkt_data', good access",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_1, 1),

			BPF_JMP_IMM(BPF_JA, 0, 0, 1),

			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, -5),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_end > pkt_data', bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_1, 1),

			BPF_JMP_IMM(BPF_JA, 0, 0, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_end > pkt_data', bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_1, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_data' < pkt_end, good access",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLT, BPF_REG_1, BPF_REG_3, 1),

			BPF_JMP_IMM(BPF_JA, 0, 0, 1),

			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, -5),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_data' < pkt_end, bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLT, BPF_REG_1, BPF_REG_3, 1),

			BPF_JMP_IMM(BPF_JA, 0, 0, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_data' < pkt_end, bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLT, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_end < pkt_data', good access",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLT, BPF_REG_3, BPF_REG_1, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_end < pkt_data', bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLT, BPF_REG_3, BPF_REG_1, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -4),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_end < pkt_data', bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLT, BPF_REG_3, BPF_REG_1, 0),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_data' >= pkt_end, good access",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGE, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, -5),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_data' >= pkt_end, bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGE, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_data' >= pkt_end, bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGE, BPF_REG_1, BPF_REG_3, 0),

			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, -5),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_end >= pkt_data', good access",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGE, BPF_REG_3, BPF_REG_1, 1),

			BPF_JMP_IMM(BPF_JA, 0, 0, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_end >= pkt_data', bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGE, BPF_REG_3, BPF_REG_1, 1),

			BPF_JMP_IMM(BPF_JA, 0, 0, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -4),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_end >= pkt_data', bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGE, BPF_REG_3, BPF_REG_1, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_data' <= pkt_end, good access",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLE, BPF_REG_1, BPF_REG_3, 1),

			BPF_JMP_IMM(BPF_JA, 0, 0, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_data' <= pkt_end, bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLE, BPF_REG_1, BPF_REG_3, 1),

			BPF_JMP_IMM(BPF_JA, 0, 0, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -4),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_data' <= pkt_end, bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLE, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_end <= pkt_data', good access",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLE, BPF_REG_3, BPF_REG_1, 1),

			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, -5),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

	{

		"XDP pkt read, pkt_end <= pkt_data', bad access 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLE, BPF_REG_3, BPF_REG_1, 1),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, -8),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"XDP pkt read, pkt_end <= pkt_data', bad access 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct xdp_md, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct xdp_md, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JLE, BPF_REG_3, BPF_REG_1, 0),

			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, -5),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 offset is outside of the packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_XDP,

		.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,

	},

};



static int probe_filter_length(const struct bpf_insn *fp)