upload-sarif@v2 Doesn't support `suppressions` property in Sarif files.

[tdonaworth]

I've recently noticed, when running semgrep, that findings that are suppressed in code with #nosemgrep flag the results with a suppressions property. This seems to be valid sarif formatting.

Example of a result:

{
    "$schema": "https://docs.oasis-open.org/sarif/sarif/v2.1.0/os/schemas/sarif-schema-2.1.0.json",
    "runs": [
        {
            "invocations": [
                {
                    "executionSuccessful": true,
                    "toolExecutionNotifications": []
                }
            ],
            "results": [
                {
                    "locations": [
                        {
                            "physicalLocation": {
                                "artifactLocation": {
                                    "uri": "backend/opre_ops/django_config/settings/common.py",
                                    "uriBaseId": "%SRCROOT%"
                                },
                                "region": {
                                    "endColumn": 15,
                                    "endLine": 91,
                                    "snippet": {
                                        "text": "REST_FRAMEWORK = {  # nosemgrep: python.django.security.audit.django-rest-framework.missing-throttle-config.missing-throttle-config"
                                    },
                                    "startColumn": 1,
                                    "startLine": 91
                                }
                            }
                        }
                    ],
                    "message": {
                        "text": "Django REST framework configuration is missing default rate- limiting options. This could inadvertently allow resource starvation or Denial of Service (DoS) attacks. Add 'DEFAULT_THROTTLE_CLASSES' and 'DEFAULT_THROTTLE_RATES' to add rate-limiting to your application."
                    },
                    "ruleId": "python.django.security.audit.django-rest-framework.missing-throttle-config.missing-throttle-config",
                    "suppressions": [
                        {
                            "kind": "inSource"
                        }
                    ]
                }
            ],
            "tool": {
                "driver": {
                    "name": "semgrep",
                    "rules": [
                        {
                            "defaultConfiguration": {
                                "level": "error"
                            },
                           ...
                    "semanticVersion": "0.111.1"
                }
            }
        }
    ],
    "version": "2.1.0"
}

When results like this are uploaded via the github/codeql-action/upload-sarif@v2 the results are still propagated as-if valid findings.

Shouldn't these be ignored, or flagged in some other way?

[tausbn]

Thank you for your question!

There are currently no concrete plans for adding support for alert suppression comments to CodeQL and Code Scanning.

However, we are continually reevaluating the need for this feature, especially seeing as it has some benefits over dismissing alerts through the Code Scanning UI.

Your comment has been added (as a point in favour of adding support for this) to our internal tracking of this matter.

[dentarg]

@tausbn That's very surprising to hear. Please also add my vote for supporting suppressions, it is very useful to be able to document and communicate suppressions in code. You can see an example of that at https://github.com/Starkast/wikimum/blob/49b0656dc593e387377390cd475c8423bff254eb/config/brakeman.ignore.