update processes to allow for coordinated vulnerability disclosure (#6042)

.github/CONTRIBUTING.md

@@ -98,6 +98,8 @@ Additional references:
 
 #### Before submitting
 
+* If your change would fix a security vulnerability,
+  first follow the [vulnerability issue reporting policy][vuln-reporting], before submitting a PR.
 * To avoid merge conflicts, make sure your branch is rebased on the `master` branch of this repository.
 * Many code changes will require new tests,
   so make sure you've added a new test if existing tests do not effectively test the code changed.
@@ -299,6 +301,7 @@ Once you sign a CLA, all your existing and future pull requests will be labeled
 [testing-guidelines]: ../docs/testing-guidelines/testing-guidelines.md
 [running-tests-outside-of-ci]: ../docs/testing-guidelines/testing-guidelines.md#running-tests-outside-of-ci
 [issue-management]: ../docs/maintainers/issue-management.md
+[vuln-reporting]: ../docs/maintainers/issue-management.md#Security-Vulnerabilities
 [governance]: ../docs/community/governance.md
 [using-prs]: https://help.github.com/articles/using-pull-requests/
 [fork-a-repo]: https://help.github.com/articles/fork-a-repo/

docs/maintainers/issue-management.md

@@ -1,8 +1,14 @@
 # Issue Management
 
+## Security Vulnerabilities
+
+If you believe that there is a security vulnerability in PowerShell Core,
+it **must** be reported to [secure@microsoft.com](https://technet.microsoft.com/en-us/security/ff852094.aspx) to allow for [Coordinated Vulnerability Disclosure](https://technet.microsoft.com/en-us/security/dn467923).
+**Only** file an issue, if secure@microsoft.com has confirmed filing an issue is appropriate.
+
 ## Long-living issue labels
-=======
-## Issue and PR Labels
+
+### Issue and PR Labels
 
 Issues are opened for many different reasons.
 We use the following labels for issue classifications:
@@ -61,6 +67,7 @@ These labels describe what feature area of PowerShell that an issue affects:
 ### Operating Systems
 
 These are for issues that are specific to certain Operating Systems:
+
 * `OS-Linux`
 * `OS-macOS`
 * `OS-Windows`

docs/maintainers/releasing.md

@@ -14,7 +14,7 @@ This is to help track the release preparation work.
 
 > Note: Step 2, 3 and 4 can be done in parallel.
 
-1. Create a branch named `release` in `PowerShell/PowerShell` repository.
+1. Create a branch named `release-<Release Tag>` in our private repository.
    All release related changes should happen in this branch.
 1. Prepare packages
    - [Build release packages](#building-packages).
@@ -28,7 +28,7 @@ This is to help track the release preparation work.
 1. [Create NuGet packages](#nuget-packages) and publish them to [powershell-core feed][ps-core-feed].
 1. [Create the release tag](#release-tag) and push the tag to `PowerShell/PowerShell` repository.
 1. Create the draft and publish the release in Github.
-1. Merge the `release` branch to `master` and delete the `release` branch.
+1. Merge the `release-<Release Tag>` branch to `master` in `powershell/powershell` and delete the `release-<Release Tag>` branch.
 1. Publish Linux packages to Microsoft YUM/APT repositories.
 1. Trigger the release docker builds for Linux and Windows container images.
    - Linux: push a branch named `docker` to `powershell/powershell` repository to trigger the build at [powershell docker hub](https://hub.docker.com/r/microsoft/powershell/builds/).

test/common/markdown/markdown.tests.ps1

@@ -72,19 +72,19 @@ Describe 'Common Tests - Validate Markdown Files' -Tag 'CI' {
         try
         {
             $docsToTest = @(
+                './.github/CONTRIBUTING.md'
                 './*.md'
+                './demos/SSHRemoting/*.md'
+                './docker/*.md'
                 './docs/*.md'
                 './docs/building/*.md'
                 './docs/cmdlet-example/*.md'
                 './docs/git/submodules.md'
                 './docs/installation/*.md'
-                './docs/maintainers/README.md'
+                './docs/maintainers/*.md'
                 './docs/testing-guidelines/testing-guidelines.md'
-                './demos/SSHRemoting/*.md'
-                './docker/*.md'
                 './test/powershell/README.md'
                 './tools/*.md'
-                './.github/CONTRIBUTING.md'
             )
             $filter = ($docsToTest -join ',')
             &"gulp" test-mdsyntax --silent `