selftests/bpf: add verifier tests for bpf_call

Add extensive set of tests for bpf_call verification logic:

calls: basic sanity
calls: using r0 returned by callee
calls: callee is using r1
calls: callee using args1
calls: callee using wrong args2
calls: callee using two args
calls: callee changing pkt pointers
calls: two calls with args
calls: two calls with bad jump
calls: recursive call. test1
calls: recursive call. test2
calls: unreachable code
calls: invalid call
calls: jumping across function bodies. test1
calls: jumping across function bodies. test2
calls: call without exit
calls: call into middle of ld_imm64
calls: call into middle of other call
calls: two calls with bad fallthrough
calls: two calls with stack read
calls: two calls with stack write
calls: spill into caller stack frame
calls: two calls with stack write and void return
calls: ambiguous return value
calls: two calls that return map_value
calls: two calls that return map_value with bool condition
calls: two calls that return map_value with incorrect bool check
calls: two calls that receive map_value via arg=ptr_stack_of_caller. test1
calls: two calls that receive map_value via arg=ptr_stack_of_caller. test2
calls: two jumps that receive map_value via arg=ptr_stack_of_jumper. test3
calls: two calls that receive map_value_ptr_or_null via arg. test1
calls: two calls that receive map_value_ptr_or_null via arg. test2
calls: pkt_ptr spill into caller stack

Signed-off-by: Alexei Starovoitov <[e-mail]>
Acked-by: Daniel Borkmann <[e-mail]>
Signed-off-by: Daniel Borkmann <[e-mail]>

tools/testing/selftests/bpf/test_verifier.c

···
  * Testsuite for eBPF verifier
  *
  * Copyright (c) 2014 PLUMgrid, http://plumgrid.com
+ * Copyright (c) 2017 Facebook
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
···
 		.insns = {
 			BPF_ALU64_REG(BPF_MOV, BPF_REG_0, BPF_REG_2),
 		},
-		.errstr = "jump out of range",
+		.errstr = "not an exit",
 		.result = REJECT,
 	},
 	{
···
 		.errstr = "R0 has unknown scalar value",
 		.result = REJECT,
 		.prog_type = BPF_PROG_TYPE_CGROUP_SOCK,
+	},
+	{
+		"calls: basic sanity",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 2),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.result = ACCEPT,
+	},
+	{
+		"calls: using r0 returned by callee",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 2),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.result = ACCEPT,
+	},
+	{
+		"calls: callee is using r1",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+				    offsetof(struct __sk_buff, len)),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_ACT,
+		.result = ACCEPT,
+	},
+	{
+		"calls: callee using args1",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
+			BPF_EXIT_INSN(),
+		},
+		.errstr_unpriv = "allowed for root only",
+		.result_unpriv = REJECT,
+		.result = ACCEPT,
+	},
+	{
+		"calls: callee using wrong args2",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "R2 !read_ok",
+		.result = REJECT,
+	},
+	{
+		"calls: callee using two args",
+		.insns = {
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6,
+				    offsetof(struct __sk_buff, len)),
+			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_6,
+				    offsetof(struct __sk_buff, len)),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),
+			BPF_EXIT_INSN(),
+		},
+		.errstr_unpriv = "allowed for root only",
+		.result_unpriv = REJECT,
+		.result = ACCEPT,
+	},
+	{
+		"calls: callee changing pkt pointers",
+		.insns = {
+			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,
+				    offsetof(struct xdp_md, data)),
+			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
+				    offsetof(struct xdp_md, data_end)),
+			BPF_MOV64_REG(BPF_REG_8, BPF_REG_6),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_8, 8),
+			BPF_JMP_REG(BPF_JGT, BPF_REG_8, BPF_REG_7, 2),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			/* clear_all_pkt_pointers() has to walk all frames
+			 * to make sure that pkt pointers in the caller
+			 * are cleared when callee is calling a helper that
+			 * adjusts packet size
+			 */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+			BPF_MOV32_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_2, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_xdp_adjust_head),
+			BPF_EXIT_INSN(),
+		},
+		.result = REJECT,
+		.errstr = "R6 invalid mem access 'inv'",
+		.prog_type = BPF_PROG_TYPE_XDP,
+	},
+	{
+		"calls: two calls with args",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
+			BPF_EXIT_INSN(),
+			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+				    offsetof(struct __sk_buff, len)),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.result = ACCEPT,
+	},
+	{
+		"calls: two calls with bad jump",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
+			BPF_EXIT_INSN(),
+			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+				    offsetof(struct __sk_buff, len)),
+			BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, -3),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "jump out of range from insn 11 to 9",
+		.result = REJECT,
+	},
+	{
+		"calls: recursive call. test1",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -1),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "back-edge",
+		.result = REJECT,
+	},
+	{
+		"calls: recursive call. test2",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -3),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "back-edge",
+		.result = REJECT,
+	},
+	{
+		"calls: unreachable code",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "unreachable insn 6",
+		.result = REJECT,
+	},
+	{
+		"calls: invalid call",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -4),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "invalid destination",
+		.result = REJECT,
+	},
+	{
+		"calls: jumping across function bodies. test1",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+			BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, -3),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "jump out of range",
+		.result = REJECT,
+	},
+	{
+		"calls: jumping across function bodies. test2",
+		.insns = {
+			BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 3),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "jump out of range",
+		.result = REJECT,
+	},
+	{
+		"calls: call without exit",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, -2),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "not an exit",
+		.result = REJECT,
+	},
+	{
+		"calls: call into middle of ld_imm64",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+			BPF_LD_IMM64(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "last insn",
+		.result = REJECT,
+	},
+	{
+		"calls: call into middle of other call",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "last insn",
+		.result = REJECT,
+	},
+	{
+		"calls: two calls with bad fallthrough",
+		.insns = {
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_0),
+			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+				    offsetof(struct __sk_buff, len)),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_TRACEPOINT,
+		.errstr = "not an exit",
+		.result = REJECT,
+	},
+	{
+		"calls: two calls with stack read",
+		.insns = {
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 6),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_7),
+			BPF_EXIT_INSN(),
+			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_XDP,
+		.result = ACCEPT,
+	},
+	{
+		"calls: two calls with stack write",
+		.insns = {
+			/* main prog */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -16),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 7),
+			BPF_MOV64_REG(BPF_REG_8, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_8, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_0, BPF_REG_8),
+			/* write into stack frame of main prog */
+			BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			/* read from stack frame of main prog */
+			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_XDP,
+		.result = ACCEPT,
+	},
+	{
+		"calls: spill into caller stack frame",
+		.insns = {
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+			BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, 0),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_XDP,
+		.errstr = "cannot spill",
+		.result = REJECT,
+	},
+	{
+		"calls: two calls with stack write and void return",
+		.insns = {
+			/* main prog */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -16),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			/* write into stack frame of main prog */
+			BPF_ST_MEM(BPF_DW, BPF_REG_1, 0, 0),
+			BPF_EXIT_INSN(), /* void return */
+		},
+		.prog_type = BPF_PROG_TYPE_XDP,
+		.result = ACCEPT,
+	},
+	{
+		"calls: ambiguous return value",
+		.insns = {
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 5),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+			BPF_EXIT_INSN(),
+			BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.errstr_unpriv = "allowed for root only",
+		.result_unpriv = REJECT,
+		.errstr = "R0 !read_ok",
+		.result = REJECT,
+	},
+	{
+		"calls: two calls that return map_value",
+		.insns = {
+			/* main prog */
+			/* pass fp-16, fp-8 into a function */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 8),
+
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
+			BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			/* fetch secound map_value_ptr from the stack */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -16),
+			BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			/* call 3rd function twice */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			/* first time with fp-8 */
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 3),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
+			/* second time with fp-16 */
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			/* lookup from map */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			/* write map_value_ptr into stack frame of main prog */
+			BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(), /* return 0 */
+		},
+		.prog_type = BPF_PROG_TYPE_XDP,
+		.fixup_map1 = { 23 },
+		.result = ACCEPT,
+	},
+	{
+		"calls: two calls that return map_value with bool condition",
+		.insns = {
+			/* main prog */
+			/* pass fp-16, fp-8 into a function */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			/* call 3rd function twice */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			/* first time with fp-8 */
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 9),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
+			/* second time with fp-16 */
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 1, 2),
+			/* fetch secound map_value_ptr from the stack */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			/* lookup from map */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(), /* return 0 */
+			/* write map_value_ptr into stack frame of main prog */
+			BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(), /* return 1 */
+		},
+		.prog_type = BPF_PROG_TYPE_XDP,
+		.fixup_map1 = { 23 },
+		.result = ACCEPT,
+	},
+	{
+		"calls: two calls that return map_value with incorrect bool check",
+		.insns = {
+			/* main prog */
+			/* pass fp-16, fp-8 into a function */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			/* call 3rd function twice */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			/* first time with fp-8 */
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 9),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
+			/* second time with fp-16 */
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			/* fetch secound map_value_ptr from the stack */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_7, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			/* lookup from map */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(), /* return 0 */
+			/* write map_value_ptr into stack frame of main prog */
+			BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(), /* return 1 */
+		},
+		.prog_type = BPF_PROG_TYPE_XDP,
+		.fixup_map1 = { 23 },
+		.result = REJECT,
+		.errstr = "invalid read from stack off -16+0 size 8",
+	},
+	{
+		"calls: two calls that receive map_value via arg=ptr_stack_of_caller. test1",
+		.insns = {
+			/* main prog */
+			/* pass fp-16, fp-8 into a function */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			/* 1st lookup from map */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_8, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 2),
+			/* write map_value_ptr into stack frame of main prog at fp-8 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_8, 1),
+
+			/* 2nd lookup from map */
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), /* 20 */
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, /* 24 */
+				     BPF_FUNC_map_lookup_elem),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_9, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 2),
+			/* write map_value_ptr into stack frame of main prog at fp-16 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_9, 1),
+
+			/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), /* 30 */
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
+			BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
+			BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),  /* 34 */
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			/* if arg2 == 1 do *arg1 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+
+			/* if arg4 == 1 do *arg3 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 2, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.fixup_map1 = { 12, 22 },
+		.result = REJECT,
+		.errstr = "invalid access to map value, value_size=8 off=2 size=8",
+	},
+	{
+		"calls: two calls that receive map_value via arg=ptr_stack_of_caller. test2",
+		.insns = {
+			/* main prog */
+			/* pass fp-16, fp-8 into a function */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			/* 1st lookup from map */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_8, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 2),
+			/* write map_value_ptr into stack frame of main prog at fp-8 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_8, 1),
+
+			/* 2nd lookup from map */
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), /* 20 */
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, /* 24 */
+				     BPF_FUNC_map_lookup_elem),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_9, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 2),
+			/* write map_value_ptr into stack frame of main prog at fp-16 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_9, 1),
+
+			/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), /* 30 */
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
+			BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
+			BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),  /* 34 */
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			/* if arg2 == 1 do *arg1 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+
+			/* if arg4 == 1 do *arg3 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.fixup_map1 = { 12, 22 },
+		.result = ACCEPT,
+	},
+	{
+		"calls: two jumps that receive map_value via arg=ptr_stack_of_jumper. test3",
+		.insns = {
+			/* main prog */
+			/* pass fp-16, fp-8 into a function */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			/* 1st lookup from map */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -24, 0),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -24),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_8, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 2),
+			/* write map_value_ptr into stack frame of main prog at fp-8 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_8, 1),
+
+			/* 2nd lookup from map */
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -24),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_9, 0),  // 26
+			BPF_JMP_IMM(BPF_JA, 0, 0, 2),
+			/* write map_value_ptr into stack frame of main prog at fp-16 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
+			BPF_MOV64_IMM(BPF_REG_9, 1),
+
+			/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), // 30
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
+			BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
+			BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1), // 34
+			BPF_JMP_IMM(BPF_JA, 0, 0, -30),
+
+			/* subprog 2 */
+			/* if arg2 == 1 do *arg1 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+
+			/* if arg4 == 1 do *arg3 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 2, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, -8),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.fixup_map1 = { 12, 22 },
+		.result = REJECT,
+		.errstr = "invalid access to map value, value_size=8 off=2 size=8",
+	},
+	{
+		"calls: two calls that receive map_value_ptr_or_null via arg. test1",
+		.insns = {
+			/* main prog */
+			/* pass fp-16, fp-8 into a function */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			/* 1st lookup from map */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			/* write map_value_ptr_or_null into stack frame of main prog at fp-8 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_8, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 1),
+			BPF_MOV64_IMM(BPF_REG_8, 1),
+
+			/* 2nd lookup from map */
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			/* write map_value_ptr_or_null into stack frame of main prog at fp-16 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_9, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 1),
+			BPF_MOV64_IMM(BPF_REG_9, 1),
+
+			/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
+			BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
+			BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			/* if arg2 == 1 do *arg1 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+
+			/* if arg4 == 1 do *arg3 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.fixup_map1 = { 12, 22 },
+		.result = ACCEPT,
+	},
+	{
+		"calls: two calls that receive map_value_ptr_or_null via arg. test2",
+		.insns = {
+			/* main prog */
+			/* pass fp-16, fp-8 into a function */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+			BPF_MOV64_REG(BPF_REG_7, BPF_REG_2),
+			/* 1st lookup from map */
+			BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			/* write map_value_ptr_or_null into stack frame of main prog at fp-8 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_6, BPF_REG_0, 0),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_8, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 1),
+			BPF_MOV64_IMM(BPF_REG_8, 1),
+
+			/* 2nd lookup from map */
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+			BPF_LD_MAP_FD(BPF_REG_1, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_map_lookup_elem),
+			/* write map_value_ptr_or_null into stack frame of main prog at fp-16 */
+			BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
+			BPF_MOV64_IMM(BPF_REG_9, 0),
+			BPF_JMP_IMM(BPF_JA, 0, 0, 1),
+			BPF_MOV64_IMM(BPF_REG_9, 1),
+
+			/* call 3rd func with fp-8, 0|1, fp-16, 0|1 */
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_MOV64_REG(BPF_REG_2, BPF_REG_8),
+			BPF_MOV64_REG(BPF_REG_3, BPF_REG_7),
+			BPF_MOV64_REG(BPF_REG_4, BPF_REG_9),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+
+			/* subprog 2 */
+			/* if arg2 == 1 do *arg1 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 1, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+
+			/* if arg4 == 0 do *arg3 = 0 */
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_4, 0, 2),
+			/* fetch map_value_ptr from the stack of this function */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
+			/* write into map value */
+			BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.fixup_map1 = { 12, 22 },
+		.result = REJECT,
+		.errstr = "R0 invalid mem access 'inv'",
+	},
+	{
+		"calls: pkt_ptr spill into caller stack",
+		.insns = {
+			BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+			BPF_EXIT_INSN(),
+
+			/* subprog 1 */
+			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),
+			/* spill unchecked pkt_ptr into stack of caller */
+			BPF_STX_MEM(BPF_DW, BPF_REG_4, BPF_REG_2, 0),
+			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 2),
+			/* now the pkt range is verified, read pkt_ptr from stack */
+			BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_4, 0),
+			/* write 4 bytes into packet */
+			BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.result = ACCEPT,
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
 	},
 };