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Commit 6d191ed4 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

bpf: add various test cases for verifier selftest 



Add couple of verifier test cases for x|imm += pkt_ptr, including the
imm += x extension.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 43188702

tools/testing/selftests/bpf/test_verifier.c

+165 −0
Original line number Original line Diff line number Diff line
@@ -2657,6 +2657,171 @@ static struct bpf_test tests[] = { 
		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

		.flags = F_LOAD_WITH_STRICT_ALIGNMENT,

		.flags = F_LOAD_WITH_STRICT_ALIGNMENT,

	},

	},

	{

		"direct packet access: test18 (imm += pkt_ptr, 1)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_IMM(BPF_REG_0, 8),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),

			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_SCHED_CLS,

	},

	{

		"direct packet access: test19 (imm += pkt_ptr, 2)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, 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, 3),

			BPF_MOV64_IMM(BPF_REG_4, 4),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_4, BPF_REG_2),

			BPF_STX_MEM(BPF_B, BPF_REG_4, BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"direct packet access: test20 (x += pkt_ptr, 1)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_IMM(BPF_REG_0, 0xffffffff),

			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),

			BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 0xffff),

			BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_4, BPF_REG_2),

			BPF_MOV64_REG(BPF_REG_5, BPF_REG_4),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 0xffff - 1),

			BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_3, 1),

			BPF_STX_MEM(BPF_DW, BPF_REG_5, BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

		.result = ACCEPT,

	},

	{

		"direct packet access: test21 (x += pkt_ptr, 2)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, 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, 9),

			BPF_MOV64_IMM(BPF_REG_4, 0xffffffff),

			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_4, -8),

			BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_10, -8),

			BPF_ALU64_IMM(BPF_AND, BPF_REG_4, 0xffff),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_4, BPF_REG_2),

			BPF_MOV64_REG(BPF_REG_5, BPF_REG_4),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 0xffff - 1),

			BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_3, 1),

			BPF_STX_MEM(BPF_DW, BPF_REG_5, BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

		.result = ACCEPT,

	},

	{

		"direct packet access: test22 (x += pkt_ptr, 3)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),

			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8),

			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_3, -16),

			BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_10, -16),

			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 11),

			BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -8),

			BPF_MOV64_IMM(BPF_REG_4, 0xffffffff),

			BPF_STX_XADD(BPF_DW, BPF_REG_10, BPF_REG_4, -8),

			BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_10, -8),

			BPF_ALU64_IMM(BPF_RSH, BPF_REG_4, 48),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_4, BPF_REG_2),

			BPF_MOV64_REG(BPF_REG_0, BPF_REG_4),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 2),

			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 2),

			BPF_MOV64_IMM(BPF_REG_2, 1),

			BPF_STX_MEM(BPF_H, BPF_REG_4, BPF_REG_2, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

		.result = ACCEPT,

	},

	{

		"direct packet access: test23 (x += pkt_ptr, 4)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_IMM(BPF_REG_0, 0xffffffff),

			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),

			BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 0xffff),

			BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),

			BPF_MOV64_IMM(BPF_REG_0, 31),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),

			BPF_MOV64_REG(BPF_REG_5, BPF_REG_0),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 0xffff - 1),

			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),

			BPF_STX_MEM(BPF_DW, BPF_REG_5, BPF_REG_0, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

		.result = REJECT,

		.errstr = "cannot add integer value with 47 upper zero bits to ptr_to_packet",

	},

	{

		"direct packet access: test24 (x += pkt_ptr, 5)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_IMM(BPF_REG_0, 0xffffffff),

			BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),

			BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 0xff),

			BPF_MOV64_REG(BPF_REG_4, BPF_REG_0),

			BPF_MOV64_IMM(BPF_REG_0, 64),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),

			BPF_MOV64_REG(BPF_REG_5, BPF_REG_0),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 0xffff - 1),

			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),

			BPF_STX_MEM(BPF_DW, BPF_REG_5, BPF_REG_0, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

		.result = ACCEPT,

	},

	{

	{

		"helper access to packet: test1, valid packet_ptr range",

		"helper access to packet: test1, valid packet_ptr range",

		.insns = {

		.insns = {