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bpf: add test cases to bpf selftests to cover all access tests
authorDaniel Borkmann <daniel@iogearbox.net>
Sat, 21 Oct 2017 00:34:23 +0000 (02:34 +0200)
committerDavid S. Miller <davem@davemloft.net>
Sat, 21 Oct 2017 23:56:09 +0000 (00:56 +0100)
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: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
tools/testing/selftests/bpf/test_verifier.c patch | blob | history

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 50e15ce..64ae21f 100644 (file)
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -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)
Domain: System / Kernel; Licenses: GPL-2.0;