bpf: add test cases for non-pointer sanitiation logic

Add two additional tests for further asserting the
BPF_ALU_NON_POINTER logic with cases that were missed
previously.

Cc: Marek Majkowski <marek@cloudflare.com>
Cc: Arthur Fabre <afabre@cloudflare.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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

@@ -173,7 +173,7 @@
 	.retval = 0,
 },
 {
-	"sanitation: alu with different scalars",
+	"sanitation: alu with different scalars 1",
 	.insns = {
 	BPF_MOV64_IMM(BPF_REG_0, 1),
 	BPF_LD_MAP_FD(BPF_REG_ARG1, 0),
@@ -198,6 +198,48 @@
 	.result = ACCEPT,
 	.retval = 0x100000,
 },
+{
+	"sanitation: alu with different scalars 2",
+	.insns = {
+	BPF_MOV64_IMM(BPF_REG_0, 1),
+	BPF_LD_MAP_FD(BPF_REG_1, 0),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_FP),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+	BPF_ST_MEM(BPF_DW, BPF_REG_FP, -16, 0),
+	BPF_EMIT_CALL(BPF_FUNC_map_delete_elem),
+	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+	BPF_MOV64_REG(BPF_REG_2, BPF_REG_FP),
+	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -16),
+	BPF_EMIT_CALL(BPF_FUNC_map_delete_elem),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_8, BPF_REG_6),
+	BPF_ALU64_REG(BPF_ADD, BPF_REG_8, BPF_REG_7),
+	BPF_MOV64_REG(BPF_REG_0, BPF_REG_8),
+	BPF_EXIT_INSN(),
+	},
+	.fixup_map_array_48b = { 1 },
+	.result = ACCEPT,
+	.retval = -EINVAL * 2,
+},
+{
+	"sanitation: alu with different scalars 3",
+	.insns = {
+	BPF_MOV64_IMM(BPF_REG_0, EINVAL),
+	BPF_ALU64_IMM(BPF_MUL, BPF_REG_0, -1),
+	BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
+	BPF_MOV64_IMM(BPF_REG_0, EINVAL),
+	BPF_ALU64_IMM(BPF_MUL, BPF_REG_0, -1),
+	BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+	BPF_MOV64_REG(BPF_REG_8, BPF_REG_6),
+	BPF_ALU64_REG(BPF_ADD, BPF_REG_8, BPF_REG_7),
+	BPF_MOV64_REG(BPF_REG_0, BPF_REG_8),
+	BPF_EXIT_INSN(),
+	},
+	.result = ACCEPT,
+	.retval = -EINVAL * 2,
+},
 {
 	"map access: value_ptr += known scalar, upper oob arith, test 1",
 	.insns = {