Don't allow handling multiple code/data section in EOF1 validation

Author: gumb0

lib/evmone/eof.cpp

@@ -83,8 +83,13 @@ std::pair<EOF1Header, EOFValidationErrror> validate_eof1(
             case DATA_SECTION:
                 if (section_sizes[CODE_SECTION] == 0)
                     return {{}, EOFValidationErrror::code_section_missing};
-                [[fallthrough]];
+                if (section_sizes[DATA_SECTION] != 0)
+                    return {{}, EOFValidationErrror::multiple_data_sections};
+                state = State::section_size;
+                break;
             case CODE_SECTION:
+                if (section_sizes[CODE_SECTION] != 0)
+                    return {{}, EOFValidationErrror::multiple_code_sections};
                 state = State::section_size;
                 break;
             default:

lib/evmone/eof.hpp

@@ -36,6 +36,8 @@ enum class EOFValidationErrror
 
     incomplete_section_size,
     code_section_missing,
+    multiple_code_sections,
+    multiple_data_sections,
     unknown_section_id,
     zero_section_size,
     section_headers_not_terminated,

test/unittests/eof_validation_test.cpp

@@ -74,3 +74,17 @@ TEST(eof_validation, EOF1_data_section_0_size)
     EXPECT_EQ(validate_eof(from_hex("EF0001 010001 020000 00 FE")),
         EOFValidationErrror::zero_section_size);
 }
+
+TEST(eof_validation, EOF1_multiple_code_sections)
+{
+    EXPECT_EQ(validate_eof(from_hex("EF0001 010001 010001 00 FE FE")),
+        EOFValidationErrror::multiple_code_sections);
+    EXPECT_EQ(validate_eof(from_hex("EF0001 010001 010001 020001 00 FE FE DA")),
+        EOFValidationErrror::multiple_code_sections);
+}
+
+TEST(eof_validation, EOF1_multiple_data_sections)
+{
+    EXPECT_EQ(validate_eof(from_hex("EF0001 010001 020001 020001 00 FE DA DA")),
+        EOFValidationErrror::multiple_data_sections);
+}