change selftest map_ptr_kern.c which will fail without previous

verifier change. Also added to verifier test for both
"map_ptr += scalar" and "scalar += map_ptr" arithmetic.

Signed-off-by: Yonghong Song <yhs@fb.com>
---
 .../selftests/bpf/progs/map_ptr_kern.c        |  4 +--
 .../testing/selftests/bpf/verifier/map_ptr.c  | 32 +++++++++++++++++++
 2 files changed, 34 insertions(+), 2 deletions(-)

Author: yonghong-song

tools/testing/selftests/bpf/progs/map_ptr_kern.c

@@ -74,8 +74,8 @@ static inline int check(struct bpf_map *indirect, struct bpf_map *direct,
 	return 1;
 }
 
-static inline int check_default(struct bpf_map *indirect,
-				struct bpf_map *direct)
+static __attribute__ ((noinline)) int
+check_default(struct bpf_map *indirect, struct bpf_map *direct)
 {
 	VERIFY(check(indirect, direct, sizeof(__u32), sizeof(__u32),
 		     MAX_ENTRIES));

tools/testing/selftests/bpf/verifier/map_ptr.c

@@ -60,3 +60,35 @@
 	.result = ACCEPT,
 	.retval = 1,
 },
+{
+	"bpf_map_ptr: r = 0, map_ptr = map_ptr + r",
+	.insns = {
+	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_MOV64_IMM(BPF_REG_0, 0),
+	BPF_LD_MAP_FD(BPF_REG_1, 0),
+	BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_hash_16b = { 4 },
+	.result = ACCEPT,
+},
+{
+	"bpf_map_ptr: r = 0, r = r + map_ptr",
+	.insns = {
+	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_MOV64_IMM(BPF_REG_1, 0),
+	BPF_LD_MAP_FD(BPF_REG_0, 0),
+	BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
+	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_hash_16b = { 4 },
+	.result = ACCEPT,
+},