14 files changed, 1339 insertions, 0 deletions
diff --git a/BaseTools/Plugin/CodeQL/CodeQlAnalyzePlugin.py b/BaseTools/Plugin/CodeQL/CodeQlAnalyzePlugin.py
new file mode 100644
index 0000000000..9734478f8b
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/CodeQlAnalyzePlugin.py
@@ -0,0 +1,222 @@
+# @file CodeQAnalyzePlugin.py
+#
+# A build plugin that analyzes a CodeQL database.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+import json
+import logging
+import os
+import yaml
+
+from analyze import analyze_filter
+from common import codeql_plugin
+
+from edk2toolext import edk2_logging
+from edk2toolext.environment.plugintypes.uefi_build_plugin import \
+    IUefiBuildPlugin
+from edk2toolext.environment.uefi_build import UefiBuilder
+from edk2toollib.uefi.edk2.path_utilities import Edk2Path
+from edk2toollib.utility_functions import RunCmd
+from pathlib import Path
+
+
+class CodeQlAnalyzePlugin(IUefiBuildPlugin):
+
+    def do_post_build(self, builder: UefiBuilder) -> int:
+        """CodeQL analysis post-build functionality.
+
+        Args:
+            builder (UefiBuilder): A UEFI builder object for this build.
+
+        Returns:
+            int: The number of CodeQL errors found. Zero indicates that
+            AuditOnly mode is enabled or no failures were found.
+        """
+        self.builder = builder
+        self.package = builder.edk2path.GetContainingPackage(
+            builder.edk2path.GetAbsolutePathOnThisSystemFromEdk2RelativePath(
+                builder.env.GetValue("ACTIVE_PLATFORM")
+            )
+        )
+
+        self.package_path = Path(
+            builder.edk2path.GetAbsolutePathOnThisSystemFromEdk2RelativePath(
+                self.package
+            )
+        )
+        self.target = builder.env.GetValue("TARGET")
+
+        self.codeql_db_path = codeql_plugin.get_codeql_db_path(
+                                builder.ws, self.package, self.target,
+                                new_path=False)
+
+        self.codeql_path = codeql_plugin.get_codeql_cli_path()
+        if not self.codeql_path:
+            logging.critical("CodeQL build enabled but CodeQL CLI application "
+                             "not found.")
+            return -1
+
+        codeql_sarif_dir_path = self.codeql_db_path[
+                                        :self.codeql_db_path.rindex('-')]
+        codeql_sarif_dir_path = codeql_sarif_dir_path.replace(
+                                        "-db-", "-analysis-")
+        self.codeql_sarif_path = os.path.join(
+                                        codeql_sarif_dir_path,
+                                        (os.path.basename(
+                                            self.codeql_db_path) +
+                                            ".sarif"))
+
+        edk2_logging.log_progress(f"Analyzing {self.package} ({self.target}) "
+                                  f"CodeQL database at:\n"
+                                  f"           {self.codeql_db_path}")
+        edk2_logging.log_progress(f"Results will be written to:\n"
+                                  f"           {self.codeql_sarif_path}")
+
+        # Packages are allowed to specify package-specific query specifiers
+        # in the package CI YAML file that override the global query specifier.
+        audit_only = False
+        query_specifiers = None
+        package_config_file = Path(os.path.join(
+                                self.package_path, self.package + ".ci.yaml"))
+        plugin_data = None
+        if package_config_file.is_file():
+            with open(package_config_file, 'r') as cf:
+                package_config_file_data = yaml.safe_load(cf)
+                if "CodeQlAnalyze" in package_config_file_data:
+                    plugin_data = package_config_file_data["CodeQlAnalyze"]
+                    if "AuditOnly" in plugin_data:
+                        audit_only = plugin_data["AuditOnly"]
+                    if "QuerySpecifiers" in plugin_data:
+                        logging.debug(f"Loading CodeQL query specifiers in "
+                                      f"{str(package_config_file)}")
+                        query_specifiers = plugin_data["QuerySpecifiers"]
+
+        global_audit_only = builder.env.GetValue("STUART_CODEQL_AUDIT_ONLY")
+        if global_audit_only:
+            if global_audit_only.strip().lower() == "true":
+                audit_only = True
+
+        if audit_only:
+            logging.info(f"CodeQL Analyze plugin is in audit only mode for "
+                         f"{self.package} ({self.target}).")
+
+        # Builds can override the query specifiers defined in this plugin
+        # by setting the value in the STUART_CODEQL_QUERY_SPECIFIERS
+        # environment variable.
+        if not query_specifiers:
+            query_specifiers = builder.env.GetValue(
+                                "STUART_CODEQL_QUERY_SPECIFIERS")
+
+        # Use this plugins query set file as the default fallback if it is
+        # not overridden. It is possible the file is not present if modified
+        # locally. In that case, skip the plugin.
+        plugin_query_set = Path(Path(__file__).parent, "CodeQlQueries.qls")
+
+        if not query_specifiers and plugin_query_set.is_file():
+            query_specifiers = str(plugin_query_set.resolve())
+
+        if not query_specifiers:
+            logging.warning("Skipping CodeQL analysis since no CodeQL query "
+                            "specifiers were provided.")
+            return 0
+
+        codeql_params = (f'database analyze {self.codeql_db_path} '
+                         f'{query_specifiers} --format=sarifv2.1.0 '
+                         f'--output={self.codeql_sarif_path} --download '
+                         f'--threads=0')
+
+        # CodeQL requires the sarif file parent directory to exist already.
+        Path(self.codeql_sarif_path).parent.mkdir(exist_ok=True, parents=True)
+
+        cmd_ret = RunCmd(self.codeql_path, codeql_params)
+        if cmd_ret != 0:
+            logging.critical(f"CodeQL CLI analysis failed with return code "
+                             f"{cmd_ret}.")
+
+        if not os.path.isfile(self.codeql_sarif_path):
+            logging.critical(f"The sarif file {self.codeql_sarif_path} was "
+                             f"not created. Analysis cannot continue.")
+            return -1
+
+        filter_pattern_data = []
+        global_filter_file_value = builder.env.GetValue(
+                                    "STUART_CODEQL_FILTER_FILES")
+        if global_filter_file_value:
+            global_filter_files = global_filter_file_value.strip().split(',')
+            global_filter_files = [Path(f) for f in global_filter_files]
+
+            for global_filter_file in global_filter_files:
+                if global_filter_file.is_file():
+                    with open(global_filter_file, 'r') as ff:
+                        global_filter_file_data = yaml.safe_load(ff)
+                        if "Filters" in global_filter_file_data:
+                            current_pattern_data = \
+                                global_filter_file_data["Filters"]
+                            if type(current_pattern_data) is not list:
+                                logging.critical(
+                                    f"CodeQL pattern data must be a list of "
+                                    f"strings. Data in "
+                                    f"{str(global_filter_file.resolve())} is "
+                                    f"invalid. CodeQL analysis is incomplete.")
+                                return -1
+                            filter_pattern_data += current_pattern_data
+                        else:
+                            logging.critical(
+                                f"CodeQL global filter file "
+                                f"{str(global_filter_file.resolve())} is  "
+                                f"malformed. Missing Filters section. CodeQL "
+                                f"analysis is incomplete.")
+                            return -1
+                else:
+                    logging.critical(
+                        f"CodeQL global filter file "
+                        f"{str(global_filter_file.resolve())} was not found. "
+                        f"CodeQL analysis is incomplete.")
+                    return -1
+
+        if plugin_data and "Filters" in plugin_data:
+            if type(plugin_data["Filters"]) is not list:
+                logging.critical(
+                    "CodeQL pattern data must be a list of strings. "
+                    "CodeQL analysis is incomplete.")
+                return -1
+            filter_pattern_data.extend(plugin_data["Filters"])
+
+        if filter_pattern_data:
+            logging.info("Applying CodeQL SARIF result filters.")
+            analyze_filter.filter_sarif(
+                self.codeql_sarif_path,
+                self.codeql_sarif_path,
+                filter_pattern_data,
+                split_lines=False)
+
+        with open(self.codeql_sarif_path, 'r') as sf:
+            sarif_file_data = json.load(sf)
+
+        try:
+            # Perform minimal JSON parsing to find the number of errors.
+            total_errors = 0
+            for run in sarif_file_data['runs']:
+                total_errors += len(run['results'])
+        except KeyError:
+            logging.critical("Sarif file does not contain expected data. "
+                             "Analysis cannot continue.")
+            return -1
+
+        if total_errors > 0:
+            if audit_only:
+                # Show a warning message so CodeQL analysis is not forgotten.
+                # If the repo owners truly do not want to fix CodeQL issues,
+                # analysis should be disabled entirely.
+                logging.warning(f"{self.package} ({self.target}) CodeQL "
+                                f"analysis ignored {total_errors} errors due "
+                                f"to audit mode being enabled.")
+                return 0
+            else:
+                logging.error(f"{self.package} ({self.target}) CodeQL "
+                              f"analysis failed with {total_errors} errors.")
+
+        return total_errors
diff --git a/BaseTools/Plugin/CodeQL/CodeQlAnalyze_plug_in.yaml b/BaseTools/Plugin/CodeQL/CodeQlAnalyze_plug_in.yaml
new file mode 100644
index 0000000000..ec01e55c53
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/CodeQlAnalyze_plug_in.yaml
@@ -0,0 +1,13 @@
+## @file CodeQlAnalyze_plug_in.py
+#
+# Build plugin used to analyze CodeQL results.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+{
+  "scope": "codeql-analyze",
+  "name": "CodeQL Analyze Plugin",
+  "module": "CodeQlAnalyzePlugin"
+}
diff --git a/BaseTools/Plugin/CodeQL/CodeQlBuildPlugin.py b/BaseTools/Plugin/CodeQL/CodeQlBuildPlugin.py
new file mode 100644
index 0000000000..2f6c928c21
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/CodeQlBuildPlugin.py
@@ -0,0 +1,169 @@
+# @file CodeQlBuildPlugin.py
+#
+# A build plugin that produces CodeQL results for the present build.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+import glob
+import logging
+import os
+import stat
+from common import codeql_plugin
+from pathlib import Path
+
+from edk2toolext import edk2_logging
+from edk2toolext.environment.plugintypes.uefi_build_plugin import \
+    IUefiBuildPlugin
+from edk2toolext.environment.uefi_build import UefiBuilder
+from edk2toollib.uefi.edk2.path_utilities import Edk2Path
+from edk2toollib.utility_functions import GetHostInfo, RemoveTree
+
+
+class CodeQlBuildPlugin(IUefiBuildPlugin):
+
+    def do_pre_build(self, builder: UefiBuilder) -> int:
+        """CodeQL pre-build functionality.
+
+        Args:
+            builder (UefiBuilder): A UEFI builder object for this build.
+
+        Returns:
+            int: The plugin return code. Zero indicates the plugin ran
+            successfully. A non-zero value indicates an unexpected error
+            occurred during plugin execution.
+        """
+
+        if not builder.SkipBuild:
+            self.builder = builder
+            self.package = builder.edk2path.GetContainingPackage(
+                builder.edk2path.GetAbsolutePathOnThisSystemFromEdk2RelativePath(
+                    builder.env.GetValue("ACTIVE_PLATFORM")
+                )
+            )
+
+            self.target = builder.env.GetValue("TARGET")
+
+            self.build_output_dir = builder.env.GetValue("BUILD_OUTPUT_BASE")
+
+            self.codeql_db_path = codeql_plugin.get_codeql_db_path(
+                                    builder.ws, self.package, self.target)
+
+            edk2_logging.log_progress(f"{self.package} will be built for CodeQL")
+            edk2_logging.log_progress(f"  CodeQL database will be written to "
+                                    f"{self.codeql_db_path}")
+
+            self.codeql_path = codeql_plugin.get_codeql_cli_path()
+            if not self.codeql_path:
+                logging.critical("CodeQL build enabled but CodeQL CLI application "
+                                "not found.")
+                return -1
+
+            # CodeQL can only generate a database on clean build
+            #
+            # Note: builder.CleanTree() cannot be used here as some platforms
+            #       have build steps that run before this plugin that store
+            #       files in the build output directory.
+            #
+            #       CodeQL does not care about with those files or many others such
+            #       as the FV directory, build logs, etc. so instead focus on
+            #       removing only the directories with compilation/linker output
+            #       for the architectures being built (that need clean runs for
+            #       CodeQL to work).
+            targets = self.builder.env.GetValue("TARGET_ARCH").split(" ")
+            for target in targets:
+                directory_to_delete = Path(self.build_output_dir, target)
+
+                if directory_to_delete.is_dir():
+                    logging.debug(f"Removing {str(directory_to_delete)} to have a "
+                                f"clean build for CodeQL.")
+                    RemoveTree(str(directory_to_delete))
+
+            # CodeQL CLI does not handle spaces passed in CLI commands well
+            # (perhaps at all) as discussed here:
+            #   1. https://github.com/github/codeql-cli-binaries/issues/73
+            #   2. https://github.com/github/codeql/issues/4910
+            #
+            # Since it's unclear how quotes are handled and may change in the
+            # future, this code is going to use the workaround to place the
+            # command in an executable file that is instead passed to CodeQL.
+            self.codeql_cmd_path = Path(self.build_output_dir, "codeql_build_command")
+
+            build_params = self._get_build_params()
+
+            codeql_build_cmd = ""
+            if GetHostInfo().os == "Windows":
+                self.codeql_cmd_path = self.codeql_cmd_path.parent / (
+                    self.codeql_cmd_path.name + '.bat')
+            elif GetHostInfo().os == "Linux":
+                self.codeql_cmd_path = self.codeql_cmd_path.parent / (
+                    self.codeql_cmd_path.name + '.sh')
+                codeql_build_cmd += f"#!/bin/bash{os.linesep * 2}"
+            codeql_build_cmd += "build " + build_params
+
+            self.codeql_cmd_path.parent.mkdir(exist_ok=True, parents=True)
+            self.codeql_cmd_path.write_text(encoding='utf8', data=codeql_build_cmd)
+
+            if GetHostInfo().os == "Linux":
+                os.chmod(self.codeql_cmd_path,
+                        os.stat(self.codeql_cmd_path).st_mode | stat.S_IEXEC)
+                for f in glob.glob(os.path.join(
+                    os.path.dirname(self.codeql_path), '**/*'), recursive=True):
+                        os.chmod(f, os.stat(f).st_mode | stat.S_IEXEC)
+
+            codeql_params = (f'database create {self.codeql_db_path} '
+                            f'--language=cpp '
+                            f'--source-root={builder.ws} '
+                            f'--command={self.codeql_cmd_path}')
+
+            # Set environment variables so the CodeQL build command is picked up
+            # as the active build command.
+            #
+            # Note: Requires recent changes in edk2-pytool-extensions (0.20.0)
+            #       to support reading these variables.
+            builder.env.SetValue(
+                "EDK_BUILD_CMD", self.codeql_path, "Set in CodeQL Build Plugin")
+            builder.env.SetValue(
+                "EDK_BUILD_PARAMS", codeql_params, "Set in CodeQL Build Plugin")
+
+        return 0
+
+    def _get_build_params(self) -> str:
+        """Returns the build command parameters for this build.
+
+        Based on the well-defined `build` command-line parameters.
+
+        Returns:
+            str: A string representing the parameters for the build command.
+        """
+        build_params = f"-p {self.builder.env.GetValue('ACTIVE_PLATFORM')}"
+        build_params += f" -b {self.target}"
+        build_params += f" -t {self.builder.env.GetValue('TOOL_CHAIN_TAG')}"
+
+        max_threads = self.builder.env.GetValue('MAX_CONCURRENT_THREAD_NUMBER')
+        if max_threads is not None:
+            build_params += f" -n {max_threads}"
+
+        rt = self.builder.env.GetValue("TARGET_ARCH").split(" ")
+        for t in rt:
+            build_params += " -a " + t
+
+        if (self.builder.env.GetValue("BUILDREPORTING") == "TRUE"):
+            build_params += (" -y " +
+                             self.builder.env.GetValue("BUILDREPORT_FILE"))
+            rt = self.builder.env.GetValue("BUILDREPORT_TYPES").split(" ")
+            for t in rt:
+                build_params += " -Y " + t
+
+        # add special processing to handle building a single module
+        mod = self.builder.env.GetValue("BUILDMODULE")
+        if (mod is not None and len(mod.strip()) > 0):
+            build_params += " -m " + mod
+            edk2_logging.log_progress("Single Module Build: " + mod)
+
+        build_vars = self.builder.env.GetAllBuildKeyValues(self.target)
+        for key, value in build_vars.items():
+            build_params += " -D " + key + "=" + value
+
+        return build_params
diff --git a/BaseTools/Plugin/CodeQL/CodeQlBuild_plug_in.yaml b/BaseTools/Plugin/CodeQL/CodeQlBuild_plug_in.yaml
new file mode 100644
index 0000000000..13baa58d0c
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/CodeQlBuild_plug_in.yaml
@@ -0,0 +1,13 @@
+## @file CodeQlBuild_plug_in.py
+#
+# Build plugin used to produce a CodeQL database from a build.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+{
+  "scope": "codeql-build",
+  "name": "CodeQL Build Plugin",
+  "module": "CodeQlBuildPlugin"
+}
diff --git a/BaseTools/Plugin/CodeQL/CodeQlQueries.qls b/BaseTools/Plugin/CodeQL/CodeQlQueries.qls
new file mode 100644
index 0000000000..3f97bcd583
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/CodeQlQueries.qls
@@ -0,0 +1,75 @@
+---
+- description: C++ queries
+
+- queries: '.'
+  from: codeql/cpp-queries
+
+##########################################################################################
+# Queries
+##########################################################################################
+
+## Enable When Time is Available to Fix Issues
+# Hundreds of issues. Most appear valid. Type: Recommendation.
+#- include:
+#    id: cpp/missing-null-test
+
+## Errors
+- include:
+    id: cpp/overrunning-write
+- include:
+    id: cpp/overrunning-write-with-float
+- include:
+    id: cpp/pointer-overflow-check
+- include:
+    id: cpp/very-likely-overrunning-write
+
+## Warnings
+- include:
+    id: cpp/conditionallyuninitializedvariable
+- include:
+    id: cpp/infinite-loop-with-unsatisfiable-exit-condition
+- include:
+    id: cpp/overflow-buffer
+
+# Note: Some queries above are not active by default with the below filter.
+#       Update the filter and run the queries again to get all results.
+- include:
+    tags:
+      - "security"
+      - "correctness"
+    severity:
+      - "error"
+      - "warning"
+      - "recommendation"
+
+# Specifically hide the results of these.
+#
+# The following rules have been evaluated and explicitly not included for the following reasons:
+#   - `cpp/allocation-too-small` - Appears to be hardcoded for C standard library functions `malloc`, `calloc`,
+#     `realloc`, so it consumes time without much value with custom allocation functions in the codebase.
+#   - `cpp/commented-out-code` - Triggers often. Needs further review.
+#   - `cpp/duplicate-include-guard` - The <Phase>EntryPoint.h files includes a common include guard value
+#     `__MODULE_ENTRY_POINT_H__`. This was the only occurrence found. So not very useful.
+#   - `cpp/invalid-pointer-deref` - Very limited results with what appear to be false positives.
+#   - `cpp/use-of-goto` - Goto is valid and allowed in the codebase.
+#   - `cpp/useless-expression` - Triggers too often on cases where a NULL lib implementation is provided for a function.
+#     Because the implementation simply returns, the check considers it useless.
+#   - `cpp/weak-crypto/*` - Crypto algorithms are tracked outside CodeQL.
+- exclude:
+    id: cpp/allocation-too-small
+- exclude:
+    id: cpp/commented-out-code
+- exclude:
+    id: cpp/duplicate-include-guard
+- exclude:
+    id: cpp/invalid-pointer-deref
+- exclude:
+    id: cpp/use-of-goto
+- exclude:
+    id: cpp/useless-expression
+- exclude:
+    id: cpp/weak-crypto/banned-hash-algorithms
+- exclude:
+    id: cpp/weak-crypto/capi/banned-modes
+- exclude:
+    id: cpp/weak-crypto/openssl/banned-hash-algorithms
diff --git a/BaseTools/Plugin/CodeQL/Readme.md b/BaseTools/Plugin/CodeQL/Readme.md
new file mode 100644
index 0000000000..18587e2b25
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/Readme.md
@@ -0,0 +1,388 @@
+# CodeQL Plugin
+
+The set of CodeQL plugins provided include two main plugins that seamlessly integrate into a Stuart build environment:
+
+1. `CodeQlBuildPlugin` - Used to produce a CodeQL database from a build.
+2. `CodeQlAnalyzePlugin` - Used to analyze a CodeQL database.
+
+While CodeQL can be run in a CI environment with other approaches. This plugin offers the following advantages:
+
+1. Provides exactly the same results locally as on a CI server.
+2. Integrates very well into VS Code.
+3. Very simple to use - just use normal Stuart update and build commands.
+4. Very simple to understand - minimally wraps the official CodeQL CLI.
+5. Very simple to integrate - works like any other Stuart build plugin.
+   - Integration is usually just a few lines of code.
+6. Portable - not tied to Azure DevOps specific, GitHub specific, or other host infrastructure.
+7. Versioned - the query and filters are versioned in source control so easy to find and track.
+
+It is very important to read the Integration Instructions in this file and determine how to best integrate the
+CodeQL plugin into your environment.
+
+Due to the total size of dependencies required to run CodeQL and the flexibility needed by a platform to determine what
+CodeQL queries to run and how to interpret results, a number of configuration options are provided to allow a high
+degree of flexibility during platform integration.
+
+This document is focused on those setting up the CodeQL plugin in their environment. Once setup, end users simply need
+to use their normal build commands and process and CodeQL will be integrated with it. The most relevant section for
+such users is [Local Development Tips](#local-development-tips).
+
+## Table of Contents
+
+1. [Database and Analysis Result Locations](#database-and-analysis-result-locations)
+2. [Global Configuration](#global-configuration)
+3. [Package-Specific Configuration](#package-specific-configuration)
+4. [Filter Patterns](#filter-patterns)
+5. [Integration Instructions](#integration-instructions)
+   - [Integration Step 1 - Choose Scopes](#integration-step-1---choose-scopes)
+     - [Scopes Available](#scopes-available)
+   - [Integration Step 2 - Choose CodeQL Queries](#integration-step-2---choose-codeql-queries)
+   - [Integration Step 3 - Determine Global Configuration Values](#integration-step-3---determine-global-configuration-values)
+   - [Integration Step 4 - Determine Package-Specific Configuration Values](#integration-step-4---determine-package-specific-configuration-values)
+   - [Integration Step 5 - Testing](#integration-step-5---testing)
+   - [Integration Step 6 - Define Inclusion and Exclusion Filter Patterns](#integration-step-6---define-inclusion-and-exclusion-filter-patterns)
+6. [High-Level Operation](#high-level-operation)
+   - [CodeQlBuildPlugin](#codeqlbuildplugin)
+   - [CodeQlAnalyzePlugin](#codeqlanalyzeplugin)
+7. [Local Development Tips](#local-development-tips)
+8. [Resolution Guidelines](#resolution-guidelines)
+
+## Database and Analysis Result Locations
+
+The CodeQL database is written to a directory unique to the package and target being built:
+
+  `Build/codeql-db-<package>-<target>-<instance>`
+
+For example: `Build/codeql-db-mdemodulepkg-debug-0`
+
+The plugin does not delete or overwrite existing databases, the instance value is simply increased. This is
+because databases are large, take a long time to generate, and are important for reproducing analysis results. The user
+is responsible for deleting database directories when they are no longer needed.
+
+Similarly, analysis results are written to a directory unique to the package and target. For analysis, results are
+stored in individual files so those files are stored in a single directory.
+
+For example, all analysis results for the above package and target will be stored in:
+  `codeql-analysis-mdemodulepkg-debug`
+
+CodeQL results are stored in [SARIF](https://sarifweb.azurewebsites.net/) (Static Analysis Results Interchange Format)
+([CodeQL SARIF documentation](https://codeql.github.com/docs/codeql-cli/sarif-output/)) files. Each SARIF file
+corresponding to a database will be stored in a file with an instance matching the database instance.
+
+For example, the analysis result file for the above database would be stored in this file:
+  `codeql-analysis-mdemodulepkg-debug/codeql-db-mdemodulepkg-debug-0.sarif`
+
+Result files are overwritten. This is because result files are quick to generate and need to represent the latest
+results for the last analysis operation performed. The user is responsible for backing up SARIF result files if they
+need to saved.
+
+## Global Configuration
+
+Global configuration values are specified with build environment variables.
+
+These values are all optional. They provide a convenient mechanism for a build script to set the value for all packages
+built by the script.
+
+- `STUART_CODEQL_AUDIT_ONLY` - If `true` (case insensitive), `CodeQlAnalyzePlugin` will be in audit-only mode. In this
+  mode all CodeQL failures are ignored.
+- `STUART_CODEQL_PATH` - The path to the CodeQL CLI application to use.
+- `STUART_CODEQL_QUERY_SPECIFIERS` - The CodeQL CLI query specifiers to use. See [Running codeql database analyze](https://codeql.github.com/docs/codeql-cli/analyzing-databases-with-the-codeql-cli/#running-codeql-database-analyze)
+  for possible options.
+- `STUART_CODEQL_FILTER_FILES` - The path to "filter" files that contains filter patterns as described in
+  [Filter Patterns](#filter-patterns).
+  - More than one file may be specified by separating each absolute file path with a comma.
+    - This might be useful to reference a global filter file from an upstream repo and also include a global filter
+      file for the local repo.
+    - Filters are concatenated in the order of files in the variable. Patterns in later files can override patterns
+      in earlier files.
+  - The file only needs to contain a list of filter pattern strings under a `"Filters"` key. For example:
+
+    ```yaml
+      {
+        "Filters": [
+          "<pattern-line-1>",
+          "<pattern-line-2>"
+        ]
+      }
+      ...
+    ```
+
+    Comments are allowed in the filter files and begin with `#` (like a normal YAML file).
+
+## Package-Specific Configuration
+
+Package-specific configuration values reuse existing package-level configuration approaches to simplify adjusting
+CodeQL plugin behavior per package.
+
+These values are all optional. They provide a convenient mechanism for a package owner to adjust settings specific to
+the package.
+
+``` yaml
+  "CodeQlAnalyze": {
+      "AuditOnly": False,         # Don't fail the build if there are errors. Just log them.
+      "QuerySpecifiers": ""       # Query specifiers to pass to CodeQL CLI.
+      "Filters": ""               # Inclusion/exclusion filters
+  }
+```
+
+> _NOTE:_ If a global filter set is provided via `STUART_CODEQL_FILTER_FILES` and a package has a package-specific
+> list, then the package-specific filter list (in a package CI YAML file) is appended onto the global filter list and
+> may be used to override settings in the global list.
+
+The format used to specify items in `"Filters"` is specified in [Filter Patterns](#filter-patterns).
+
+## Filter Patterns
+
+As you inspect results, you may want to include or exclude certain sets of results. For example, exclude some files by
+file path entirely or adjust the CodeQL rule applied to a certain file. This plugin reuses logic from a popular
+GitHub Action called [`filter-sarif`](https://github.com/advanced-security/filter-sarif) to allow filtering as part of
+the plugin analysis process.
+
+If any results are excluded using filters, the results are removed from the SARIF file. This allows the exclude results
+seen locally to exactly match the results on the CI server.
+
+Read the ["Patterns"](https://github.com/advanced-security/filter-sarif#patterns) section there for more details. The
+patterns section is also copied below with some updates to make the information more relevant for an edk2 codebase
+for convenience.
+
+Each pattern line is of the form:
+
+```plaintext
+[+/-]<file pattern>[:<rule pattern>]
+```
+
+For example:
+
+```yaml
+-**/*Test*.c:**             # exclusion pattern: remove all alerts from all test files
+-**/*Test*.c                # ditto, short form of the line above
++**/*.c:cpp/infiniteloop    # inclusion pattern: This line has precedence over the first two
+                            # and thus "allow lists" alerts of type "cpp/infiniteloop"
+**/*.c:cpp/infiniteloop     # ditto, the "+" in inclusion patterns is optional
+**                          # allow all alerts in all files (reverses all previous lines)
+```
+
+- The path separator character in patterns is always `/`, independent of the platform the code is running on and
+  independent of the paths in the SARIF file.
+- `*` matches any character, except a path separator
+- `**` matches any character and is only allowed between path separators, e.g. `/**/file.txt`, `**/file.txt` or `**`.
+  NOT allowed: `**.txt`, `/etc**`
+- The rule pattern is optional. If omitted, it will apply to alerts of all types.
+- Subsequent lines override earlier ones. By default all alerts are included.
+- If you need to use the literals `+`, `-`, `\` or `:` in your pattern, you can escape them with `\`, e.g.
+  `\-this/is/an/inclusion/file/pattern\:with-a-semicolon:and/a/rule/pattern/with/a/\\/backslash`. For `+` and `-`, this
+  is only necessary if they appear at the beginning of the pattern line.
+
+## Integration Instructions
+
+First, note that most CodeQL CLI operations will take a long time the first time they are run. This is due to:
+
+1. Downloads - Downloading the CodeQL CLI binary (during `stuart_update`) and downloading CodeQL queries during
+   CodeQL plugin execution
+2. Cache not established - CodeQL CLI caches data as it performs analysis. The first time analysis is performed will
+   take more time than in the future.
+
+Second, these are build plugins. This means a build needs to take place for the plugins to run. This typically happens
+in the following two scenarios:
+
+1. `stuart_build` - A single package is built and the build process is started by the stuart tools.
+2. `stuart_ci_build` - A number of packages may be built and the build process is started by the `CompilerPlugin`.
+
+In any case, each time a package is built, the CodeQL plugins will be run if their scopes are active.
+
+### Integration Step 1 - Choose Scopes
+
+Decide which scopes need to be enabled in your platform, see [Scopes Available](#scopes-available).
+
+Consider using a build profile to enable CodeQL so developers and pipelines can use the profile when they are
+interested in CodeQL results but in other cases they can easily work without CodeQL in the way.
+
+Furthermore, build-script specific command-line parameters might be useful to control CodeQL scopes and other
+behavior.
+
+#### Scopes Available
+
+This CodeQL plugin leverages scopes to control major pieces of functionality. Any combination of scopes can be
+returned from the `GetActiveScopes()` function in the platform settings manager to add and remove functionality.
+
+Plugin scopes:
+
+- `codeql-analyze` - Activate `CodeQlAnalyzePlugin` to perform post-build analysis of the last generated database for
+  the package and target specified.
+- `codeql-build` - Activate `CodeQlBuildPlugin` to hook the firmware build in pre-build such that the build will
+  generate a CodeQL database during build.
+
+In most cases, to perform a full CodeQL run, `codeql-build` should be enabled so a new CodeQL database is generated
+during build and `codeql-analyze` should be be enabled so analysis of that database is performed after the build is
+completed.
+
+External dependency scopes:
+
+- `codeql-ext-dep` - Downloads the cross-platform CodeQL CLI as an external dependency.
+- `codeql-linux-ext-dep` - Downloads the Linux CodeQL CLI as an external dependency.
+- `codeql-windows-ext-dep` - Downloads the Windows CodeQL CLI as an external dependency.
+
+Note, that the CodeQL CLI is large in size. Sizes as of the [v2.11.2 release](https://github.com/github/codeql-cli-binaries/releases/tag/v2.11.2).
+
+| Cross-platform |  Linux | Windows |
+|:--------------:|:------:|:-------:|
+|     934 MB     | 415 MB |  290 MB |
+
+Therefore, the following is recommended:
+
+1. **Ideal** - Create container images for build agents and install the CodeQL CLI for the container OS into the
+   container.
+2. Leverage host-OS detection (e.g. [`GetHostInfo()`](https://github.com/tianocore/edk2-pytool-library/blob/42ad6561af73ba34564f1577f64f7dbaf1d0a5a2/edk2toollib/utility_functions.py#L112))
+to set the scope for the appropriate operating system. This will download the much smaller OS-specific application.
+
+> _NOTE:_ You should never have more than one CodeQL external dependency scope enabled at a time.
+
+### Integration Step 2 - Choose CodeQL Queries
+
+Determine which queries need to be run against packages in your repo. In most cases, the same set of queries will be
+run against all packages. It is also possible to customize the queries run at the package level.
+
+The default set of Project Mu CodeQL queries is specified in the `MuCodeQlQueries.qls` file in this plugin.
+
+> _NOTE:_ The queries in `MuCodeQlQueries.qls` may change at any time. If you do not want these changes to impact
+> your platform, do not relay on option (3).
+
+The plugin decides what queries to run based on the following, in order of preference:
+
+1. Package CI YAML file query specifier
+2. Build environment variable query specifier
+3. Plugin default query set file
+
+For details on how to set (1) and (2), see the Package CI Configuration and Environment Variable sections respectively.
+
+> _NOTE:_ The value specified is directly passed as a `query specifier` to CodeQL CLI. Therefore, the arguments
+> allowed by the `<query-specifiers>` argument of CodeQL CLI are allowed here. See
+> [Running codeql database analyze](https://codeql.github.com/docs/codeql-cli/analyzing-databases-with-the-codeql-cli/#running-codeql-database-analyze).
+
+A likely scenario is that a platform needs to run local/closed source queries in addition to the open-source queries.
+There's various ways to handle that:
+
+1. Create a query specifier that includes all the queries needed, both public and private and use that query specifier,
+   either globally or at package-level.
+
+   For example, at the global level - `STUART_CODEQL_QUERY_SPECIFIERS` = _"Absolute_path_to_AllMyQueries.qls"_
+
+2. Specify a query specifier that includes the closed sources queries and reuse the public query list provided by
+   this plugin.
+
+   For example, at the global level - `STUART_CODEQL_QUERY_SPECIFIERS` = _"Absolute_path_to_MuCodeQlQueries.qls
+   Absolute_path_to_ClosedSourceQueries.qls"_
+
+Refer to the CodeQL documentation noted above on query specifiers to devise other options.
+
+### Integration Step 3 - Determine Global Configuration Values
+
+Review the Environment Variable section to determine which, if any, global values need to be set in your build script.
+
+### Integration Step 4 - Determine Package-Specific Configuration Values
+
+Review the Package CI Configuration section to determine which, if any, global values need to be set in your
+package's CI YAML file.
+
+### Integration Step 5 - Testing
+
+Verify a `stuart_update` and `stuart_build` (or `stuart_ci_build`) command work.
+
+### Integration Step 6 - Define Inclusion and Exclusion Filter Patterns
+
+After reviewing the test results from Step 5, determine if you need to apply any filters as described in
+[Filter Patterns](#filter-patterns).
+
+## High-Level Operation
+
+This section summarizes the complete CodeQL plugin flow. This is to help developers understand basic theory of
+operation behind the plugin and can be skipped by anyone not interested in those details.
+
+### CodeQlBuildPlugin
+
+1. Register a pre-build hook
+2. Determine the package and target being built
+3. Determine the best CodeQL CLI path to use
+   - First choice, the `STUART_CODEQL_PATH` environment variable
+     - Note: This is set by the CodeQL CLI external dependency if that is used
+   - Second choice, `codeql` as found on the system path
+4. Determine the directory name for the CodeQL database
+   - Format: `Build/codeql-db-<package>-<target>-<instance>`
+5. Clean the build directory of the active platform and target
+   - CodeQL database generation only works on clean builds
+6. Ensure the "build" step is not skipped as a build is needed to generate a CodeQL database
+7. Build a CodeQL file that wraps around the edk2 build
+   - Written to the package build directory
+     - Example: `Build/MdeModulePkg/VS2022/codeql_build_command.bat`
+8. Set the variables necessary for stuart to call CodeQL CLI during the build phase
+   - Sets `EDK_BUILD_CMD` and `EDK_BUILD_PARAMS`
+
+### CodeQlAnalyzePlugin
+
+1. Register a post-build hook
+2. Determine the package and target being built
+3. Determine the best CodeQL CLI path to use
+   - First choice, the `STUART_CODEQL_PATH` environment variable
+     - Note: This is set by the CodeQL CLI external dependency if that is used
+   - Second choice, `codeql` as found on the system path
+4. Determine the directory name for the most recent CodeQL database
+   - Format: `Build/codeql-db-<package>-<target>-<instance>`
+5. Determine plugin audit status for the given package and target
+   - Check if `AuditOnly` is enabled either globally or for the package
+6. Determine the CodeQL query specifiers to use for the given package and target
+   - First choice, the package CI YAML file value
+   - Second choice, the `STUART_CODEQL_QUERY_SPECIFIERS`
+   - Third choice, use `CodeQlQueries.qls` (in the plugin directory)
+7. Run CodeQL CLI to perform database analysis
+8. Parse the analysis SARIF file to determine the number of CodeQL failures
+9. Return the number of failures (or zero if `AuditOnly` is enabled)
+
+## Local Development Tips
+
+This section contains helpful tips to expedite common scenarios when working with CodeQL locally.
+
+1. Pre-build, Build, and Post-Build
+
+   Generating a database requires the pre-build and build steps. Analyzing a database requires the post-build step.
+
+   Therefore, if you are making tweaks that don't affect the build, such as modifying the CodeQL queries used or level
+   of severity reported, you can save time by skipping pre-build and post-build (e.g. `--skipprebuild` and
+   `--skipbuild`).
+
+2. Scopes
+
+   Similar to (1), add/remove `codeql-build` and `codeql-analyze` from the active scopes to save time depending on what
+   you are trying to do.
+
+   If you are focusing on coding, remove the code CodeQL scopes if they are active. If you are ready to check your
+   changes against CodeQL, simply add the scopes back. It is recommended to use build profiles to do this more
+   conveniently.
+
+   If you already have CodeQL CLI enabled, you can remove the `codeql-ext-dep` scope locally. The build will use the
+   `codeql` command on your path.
+
+3. CodeQL Output is in the CI Build Log
+
+   To see exactly which queries CodeQL ran or why it might be taking longer than expected, look in the CI build log
+   (i.e. `Build/CI_BUILDLOG.txt`) where the CodeQL CLI application output is written.
+
+   Search for the text you see in the progress output (e.g. "Analyzing _MdeModulePkg_ (_DEBUG_) CodeQL database at")
+   to jump to the section of the log just before the CodeQL CLI is invoked.
+
+4. Use a SARIF Viewer to Read Results
+
+The [SARIF Viewer extension for VS Code](https://marketplace.visualstudio.com/items?itemName=MS-SarifVSCode.sarif-viewer)
+can open the .sarif file generated by this plugin and allow you to click links directly to the problem area in source
+files.
+
+## Resolution Guidelines
+
+This section captures brief guidelines to keep in mind while resolving CodeQL issues.
+
+1. Look at surrounding code. Changes should always take into account the context of nearby code. The new logic may
+   need to account conditions not immediately obvious based on the issue alone. It is easy to focus only on the line
+   of code highlighted by CodeQL and miss the code's role in the big picture.
+2. A CodeQL alert may be benign but the code can be refactored to prevent the alert. Often refactoring the code makes
+   the code intention clearer and avoids an unnecessary exception.
+3. Consider adding unit tests while making CodeQL fixes especially for commonly used code and code with a high volume
+   of CodeQL alerts.
diff --git a/BaseTools/Plugin/CodeQL/analyze/__init__.py b/BaseTools/Plugin/CodeQL/analyze/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/analyze/__init__.py
diff --git a/BaseTools/Plugin/CodeQL/analyze/analyze_filter.py b/BaseTools/Plugin/CodeQL/analyze/analyze_filter.py
new file mode 100644
index 0000000000..f363dd378f
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/analyze/analyze_filter.py
@@ -0,0 +1,184 @@
+# @file analyze_filter.py
+#
+# Filters results in a SARIF file.
+#
+#            Apache License
+#      Version 2.0, January 2004
+#   http://www.apache.org/licenses/
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# This file has been altered from its original form. Based on code in:
+#   https://github.com/advanced-security/filter-sarif
+#
+# It primarily contains modifications made to integrate with the CodeQL plugin.
+#
+# Specifically:
+#   https://github.com/advanced-security/filter-sarif/blob/main/filter_sarif.py
+#
+# View the full and complete license as provided by that repository here:
+#   https://github.com/advanced-security/filter-sarif/blob/main/LICENSE
+#
+# SPDX-License-Identifier: Apache-2.0
+##
+
+import json
+import logging
+import re
+from os import PathLike
+from typing import Iterable, List, Tuple
+
+from analyze.globber import match
+
+
+def _match_path_and_rule(
+    path: str, rule: str, patterns: Iterable[str]) -> bool:
+    """Returns whether a given path matches a given rule.
+
+    Args:
+        path (str): A file path string.
+        rule (str): A rule file path string.
+        patterns (Iterable[str]): An iterable of pattern strings.
+
+    Returns:
+        bool: True if the path matches a rule. Otherwise, False.
+    """
+    result = True
+    for s, fp, rp in patterns:
+        if match(rp, rule) and match(fp, path):
+            result = s
+    return result
+
+
+def _parse_pattern(line: str) -> Tuple[str]:
+    """Parses a given pattern line.
+
+    Args:
+        line (str): The line string that contains the rule.
+
+    Returns:
+        Tuple[str]: The parsed sign, file pattern, and rule pattern from the
+                    line.
+    """
+    sep_char = ':'
+    esc_char = '\\'
+    file_pattern = ''
+    rule_pattern = ''
+    seen_separator = False
+    sign = True
+
+    # inclusion or exclusion pattern?
+    u_line = line
+    if line:
+        if line[0] == '-':
+            sign = False
+            u_line = line[1:]
+        elif line[0] == '+':
+            u_line = line[1:]
+
+    i = 0
+    while i < len(u_line):
+        c = u_line[i]
+        i = i + 1
+        if c == sep_char:
+            if seen_separator:
+                raise Exception(
+                    'Invalid pattern: "' + line + '" Contains more than one '
+                    'separator!')
+            seen_separator = True
+            continue
+        elif c == esc_char:
+            next_c = u_line[i] if (i < len(u_line)) else None
+            if next_c in ['+' , '-', esc_char, sep_char]:
+                i = i + 1
+                c = next_c
+        if seen_separator:
+            rule_pattern = rule_pattern + c
+        else:
+            file_pattern = file_pattern + c
+
+    if not rule_pattern:
+        rule_pattern = '**'
+
+    return sign, file_pattern, rule_pattern
+
+
+def filter_sarif(input_sarif: PathLike,
+                 output_sarif: PathLike,
+                 patterns: List[str],
+                 split_lines: bool) -> None:
+    """Filters a SARIF file with a given set of filter patterns.
+
+    Args:
+        input_sarif (PathLike): Input SARIF file path.
+        output_sarif (PathLike): Output SARIF file path.
+        patterns (PathLike): List of filter pattern strings.
+        split_lines (PathLike): Whether to split lines in individual patterns.
+    """
+    if split_lines:
+        tmp = []
+        for p in patterns:
+            tmp = tmp + re.split('\r?\n', p)
+        patterns = tmp
+
+    patterns = [_parse_pattern(p) for p in patterns if p]
+
+    logging.debug('Given patterns:')
+    for s, fp, rp in patterns:
+        logging.debug(
+            'files: {file_pattern}    rules: {rule_pattern} ({sign})'.format(
+                file_pattern=fp,
+                rule_pattern=rp,
+                sign='positive' if s else 'negative'))
+
+    with open(input_sarif, 'r') as f:
+        s = json.load(f)
+
+    for run in s.get('runs', []):
+        if run.get('results', []):
+            new_results = []
+            for r in run['results']:
+                if r.get('locations', []):
+                    new_locations = []
+                    for l in r['locations']:
+                        # TODO: The uri field is optional. We might have to
+                        #       fetch the actual uri from "artifacts" via
+                        #       "index"
+                        # (see https://github.com/microsoft/sarif-tutorials/blob/main/docs/2-Basics.md#-linking-results-to-artifacts)
+                        uri = l.get(
+                                    'physicalLocation', {}).get(
+                                        'artifactLocation', {}).get(
+                                            'uri', None)
+
+                        # TODO: The ruleId field is optional and potentially
+                        #       ambiguous. We might have to fetch the actual
+                        #       ruleId from the rule metadata via the ruleIndex
+                        #       field.
+                        # (see https://github.com/microsoft/sarif-tutorials/blob/main/docs/2-Basics.md#rule-metadata)
+                        ruleId = r['ruleId']
+
+                        if (uri is None or
+                            _match_path_and_rule(uri, ruleId, patterns)):
+                            new_locations.append(l)
+                    r['locations'] = new_locations
+                    if new_locations:
+                        new_results.append(r)
+                else:
+                    # locations array doesn't exist or is empty, so we can't
+                    # match on anything. Therefore, we include the result in
+                    # the output.
+                    new_results.append(r)
+            run['results'] = new_results
+
+    with open(output_sarif, 'w') as f:
+        json.dump(s, f, indent=2)
diff --git a/BaseTools/Plugin/CodeQL/analyze/globber.py b/BaseTools/Plugin/CodeQL/analyze/globber.py
new file mode 100644
index 0000000000..5d45abaa1f
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/analyze/globber.py
@@ -0,0 +1,127 @@
+# @file globber.py
+#
+# Provides global functionality for use by the CodeQL plugin.
+#
+# Copyright 2019 Jaakko Kangasharju
+#
+#            Apache License
+#      Version 2.0, January 2004
+#   http://www.apache.org/licenses/
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# This file has been altered from its original form. Based on code in:
+#   https://github.com/advanced-security/filter-sarif
+#
+# Specifically:
+#   https://github.com/advanced-security/filter-sarif/blob/main/filter_sarif.py
+#
+# It primarily contains modifications made to integrate with the CodeQL plugin.
+#
+# SPDX-License-Identifier: Apache-2.0
+##
+
+import re
+
+_double_star_after_invalid_regex = re.compile(r'[^/\\]\*\*')
+_double_star_first_before_invalid_regex = re.compile('^\\*\\*[^/]')
+_double_star_middle_before_invalid_regex = re.compile(r'[^\\]\*\*[^/]')
+
+
+def _match_component(pattern_component, file_name_component):
+    if len(pattern_component) == 0 and len(file_name_component) == 0:
+        return True
+    elif len(pattern_component) == 0:
+        return False
+    elif len(file_name_component) == 0:
+        return pattern_component == '*'
+    elif pattern_component[0] == '*':
+        return (_match_component(pattern_component, file_name_component[1:]) or
+                _match_component(pattern_component[1:], file_name_component))
+    elif pattern_component[0] == '?':
+        return _match_component(pattern_component[1:], file_name_component[1:])
+    elif pattern_component[0] == '\\':
+        return (len(pattern_component) >= 2 and
+                pattern_component[1] == file_name_component[0] and
+                _match_component(
+                    pattern_component[2:], file_name_component[1:]))
+    elif pattern_component[0] != file_name_component[0]:
+        return False
+    else:
+        return _match_component(pattern_component[1:], file_name_component[1:])
+
+
+def _match_components(pattern_components, file_name_components):
+    if len(pattern_components) == 0 and len(file_name_components) == 0:
+        return True
+    if len(pattern_components) == 0:
+        return False
+    if len(file_name_components) == 0:
+        return len(pattern_components) == 1 and pattern_components[0] == '**'
+    if pattern_components[0] == '**':
+        return (_match_components(pattern_components, file_name_components[1:])
+                or _match_components(
+                    pattern_components[1:], file_name_components))
+    else:
+        return (
+            _match_component(
+                pattern_components[0], file_name_components[0]) and
+            _match_components(
+                pattern_components[1:], file_name_components[1:]))
+
+
+def match(pattern: str, file_name: str):
+    """Match a glob pattern against a file name.
+
+    Glob pattern matching is for file names, which do not need to exist as
+    files on the file system.
+
+    A file name is a sequence of directory names, possibly followed by the name
+    of a file, with the components separated by a path separator. A glob
+    pattern is similar, except it may contain special characters: A '?' matches
+    any character in a name. A '*' matches any sequence of characters (possibly
+    empty) in a name. Both of these match only within a single component, i.e.,
+    they will not match a path separator. A component in a pattern may also be
+    a literal '**', which matches zero or more components in the complete file
+    name. A backslash '\\' in a pattern acts as an escape character, and
+    indicates that the following character is to be matched literally, even if
+    it is a special character.
+
+    Args:
+        pattern (str): The pattern to match. The path separator in patterns is
+                       always '/'.
+        file_name (str): The file name to match against. The path separator in
+                         file names is the platform separator
+
+    Returns:
+        bool: True if the pattern matches, False otherwise.
+    """
+    if (_double_star_after_invalid_regex.search(pattern) is not None or
+        _double_star_first_before_invalid_regex.search(
+            pattern) is not None or
+        _double_star_middle_before_invalid_regex.search(pattern) is not None):
+        raise ValueError(
+            '** in {} not alone between path separators'.format(pattern))
+
+    pattern = pattern.rstrip('/')
+    file_name = file_name.rstrip('/')
+
+    while '**/**' in pattern:
+        pattern = pattern.replace('**/**', '**')
+
+    pattern_components = pattern.split('/')
+
+    # We split on '\' as well as '/' to support unix and windows-style paths
+    file_name_components = re.split(r'[\\/]', file_name)
+
+    return _match_components(pattern_components, file_name_components)
diff --git a/BaseTools/Plugin/CodeQL/codeqlcli_ext_dep.yaml b/BaseTools/Plugin/CodeQL/codeqlcli_ext_dep.yaml
new file mode 100644
index 0000000000..37c7c9f595
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/codeqlcli_ext_dep.yaml
@@ -0,0 +1,26 @@
+## @file codeqlcli_ext_dep.yaml
+#
+# Downloads the CodeQL Command-Line Interface (CLI) application that support Linux, Windows, and Mac OS X.
+#
+# This download is very large but conveniently provides support for all operating systems. Use it if you
+# need CodeQL CLI support without concern for the host operating system.
+#
+# In an environment where a platform might build in different operating systems, it is recommended to set
+# the scope for the appropriate CodeQL external dependency based on the host operating system being used.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+{
+  "scope": "codeql-ext-dep",
+  "type": "web",
+  "name": "codeql_cli",
+  "source": "https://github.com/github/codeql-cli-binaries/releases/download/v2.12.4/codeql.zip",
+  "version": "2.12.4",
+  "sha256": "f682f1155d627ad97f10b1bcad97f682011986717bd3823e9cf831ed83ac96e7",
+  "compression_type": "zip",
+  "internal_path": "/codeql/",
+  "flags": ["set_shell_var", ],
+  "var_name": "STUART_CODEQL_PATH"
+}
diff --git a/BaseTools/Plugin/CodeQL/codeqlcli_linux_ext_dep.yaml b/BaseTools/Plugin/CodeQL/codeqlcli_linux_ext_dep.yaml
new file mode 100644
index 0000000000..a6ca5d0f34
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/codeqlcli_linux_ext_dep.yaml
@@ -0,0 +1,24 @@
+## @file codeqlcli_linux_ext_dep.yaml
+#
+# Downloads the Linux CodeQL Command-Line Interface (CLI) application.
+#
+# This download only supports Linux. In an environment where a platform might build in different operating
+# systems, it is recommended to set the scope for the appropriate CodeQL external dependency based on the
+# host operating system being used.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+{
+  "scope": "codeql-linux-ext-dep",
+  "type": "web",
+  "name": "codeql_linux_cli",
+  "source": "https://github.com/github/codeql-cli-binaries/releases/download/v2.14.5/codeql-linux64.zip",
+  "version": "2.14.5",
+  "sha256": "72aa5d748ff9ab57cfd86045560683bdc4897e0fe6d9f9a2786d9394674ae733",
+  "compression_type": "zip",
+  "internal_path": "/codeql/",
+  "flags": ["set_shell_var", ],
+  "var_name": "STUART_CODEQL_PATH"
+}
diff --git a/BaseTools/Plugin/CodeQL/codeqlcli_windows_ext_dep.yaml b/BaseTools/Plugin/CodeQL/codeqlcli_windows_ext_dep.yaml
new file mode 100644
index 0000000000..e706a7cabf
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/codeqlcli_windows_ext_dep.yaml
@@ -0,0 +1,24 @@
+## @file codeqlcli_windows_ext_dep.yaml
+#
+# Downloads the Windows CodeQL Command-Line Interface (CLI) application.
+#
+# This download only supports Windows. In an environment where a platform might build in different operating
+# systems, it is recommended to set the scope for the appropriate CodeQL external dependency based on the
+# host operating system being used.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+{
+  "scope": "codeql-windows-ext-dep",
+  "type": "web",
+  "name": "codeql_windows_cli",
+  "source": "https://github.com/github/codeql-cli-binaries/releases/download/v2.14.5/codeql-win64.zip",
+  "version": "2.14.5",
+  "sha256": "861fcb38365cc311efee0c3a28c77494e93c69a969885b72e53173ad473f61aa",
+  "compression_type": "zip",
+  "internal_path": "/codeql/",
+  "flags": ["set_shell_var", ],
+  "var_name": "STUART_CODEQL_PATH"
+}
diff --git a/BaseTools/Plugin/CodeQL/common/__init__.py b/BaseTools/Plugin/CodeQL/common/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/common/__init__.py
diff --git a/BaseTools/Plugin/CodeQL/common/codeql_plugin.py b/BaseTools/Plugin/CodeQL/common/codeql_plugin.py
new file mode 100644
index 0000000000..c827cc30ae
--- /dev/null
+++ b/BaseTools/Plugin/CodeQL/common/codeql_plugin.py
@@ -0,0 +1,74 @@
+# @file codeql_plugin.py
+#
+# Common logic shared across the CodeQL plugin.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+import os
+import shutil
+from os import PathLike
+
+from edk2toollib.utility_functions import GetHostInfo
+
+
+def get_codeql_db_path(workspace: PathLike, package: str, target: str,
+                       new_path: bool = True) -> str:
+    """Return the CodeQL database path for this build.
+
+    Args:
+        workspace (PathLike): The workspace path.
+        package (str): The package name (e.g. "MdeModulePkg")
+        target (str): The target (e.g. "DEBUG")
+        new_path (bool, optional): Whether to create a new database path or
+                                   return an existing path. Defaults to True.
+
+    Returns:
+        str: The absolute path to the CodeQL database directory.
+    """
+    codeql_db_dir_name = "codeql-db-" + package + "-" + target
+    codeql_db_dir_name = codeql_db_dir_name.lower()
+    codeql_db_path = os.path.join("Build", codeql_db_dir_name)
+    codeql_db_path = os.path.join(workspace, codeql_db_path)
+
+    i = 0
+    while os.path.isdir(f"{codeql_db_path + '-%s' % i}"):
+        i += 1
+
+    if not new_path:
+        if i == 0:
+            return None
+        else:
+            i -= 1
+
+    return codeql_db_path + f"-{i}"
+
+
+def get_codeql_cli_path() -> str:
+    """Return the current CodeQL CLI path.
+
+    Returns:
+        str: The absolute path to the CodeQL CLI application to use for
+             this build.
+    """
+    # The CodeQL executable path can be passed via the
+    # STUART_CODEQL_PATH environment variable (to override with a
+    # custom value for this run) or read from the system path.
+    codeql_path = None
+
+    if "STUART_CODEQL_PATH" in os.environ:
+        codeql_path = os.environ["STUART_CODEQL_PATH"]
+
+        if GetHostInfo().os == "Windows":
+            codeql_path = os.path.join(codeql_path, "codeql.exe")
+        else:
+            codeql_path = os.path.join(codeql_path, "codeql")
+
+        if not os.path.isfile(codeql_path):
+            codeql_path = None
+
+    if not codeql_path:
+        codeql_path = shutil.which("codeql")
+
+    return codeql_path