[docs] Security policy (#8006)

---------
Co-authored-by: Kevin Reid <kpreid@switchb.org>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,10 @@
 blank_issues_enabled: false
 contact_links:
   - name: Question about wgpu
-    url: https://github.com/gfx-rs/wgpu/discussions/new
+    url: https://github.com/gfx-rs/wgpu/discussions/new/choose
     about: Any questions about how to use wgpu should go here.
+  - name: Security concerns
+    url: https://github.com/gfx-rs/wgpu/security
+    about: >
+      If you have found a possible vulnerability in wgpu, please read this
+      security policy for information about reporting it confidentially.

SECURITY.md

@@ -0,0 +1,84 @@
+# WGPU Security Policy
+
+This document describes what is considered a security vulnerability in WGPU and
+how vulnerabilities should be reported.
+
+
+## Vulnerability Definition
+
+WebGPU introduces a different threat model than is sometimes applied to
+GPU-related software. Unlike typical gaming or high-performance computing
+applications, where the software accessing GPU APIs is proprietary or
+obtained from a trusted developer, WebGPU makes GPU APIs available to
+arbitrary web applications. In the threat model of the web, malicious
+content should not be able to use the GPU APIs to access data or interfaces
+outside the intended scope for interaction with web content. Therefore, `wgpu`
+seeks to prevent undefined behavior and data leaks even when its API is
+misused, and failures to do so may be considered vulnerabilities. (This is
+also in accordance with the Rust principle of safe vs. unsafe code, since the
+`wgpu` library exposes a safe API.)
+
+The WGPU maintainers have discretion in assigning a severity to individual
+vulnerabilities. It is generally considered a high-severity vulnerability in
+WGPU if JavaScript or WebAssembly code, running with privileges of ordinary web
+content in a browser that is using WGPU to provide the WebGPU API to that
+content, is able to:
+
+- Access data associated with native applications other than the user agent,
+  or associated with other web origins.
+- Escape the applicable sandbox and run arbitrary code or call arbitrary system
+  APIs on the user agent host.
+- Consume system resources to the point that it is difficult to recover
+  (e.g. by closing the web page).
+
+The WGPU Rust API offers some functionality, both supported and experimental,
+that is not part of the WebGPU standard and is not made available in JavaScript
+environments using WGPU. Associated vulnerabilities may be assigned lower
+severity than vulnerabilities that apply to a WGPU-based WebGPU implementation
+exposed to JavaScript.
+
+
+## Supported Versions
+
+The WGPU project maintains security support for serious vulnerabilities in the
+[most recent major release](https://github.com/gfx-rs/wgpu/releases). Fixes for
+security vulnerabilities found shortly after the initial release of a major
+version may also be provided for the previous major release.
+
+Mozilla provides security support for versions of WGPU used in [current
+versions of Firefox](https://whattrainisitnow.com/).
+
+The version of WGPU that is active can be found in the Firefox repositories:
+
+- [release](https://github.com/mozilla-firefox/firefox/blob/release/gfx/wgpu_bindings/Cargo.toml),
+- [beta](https://github.com/mozilla-firefox/firefox/blob/beta/gfx/wgpu_bindings/Cargo.toml), and
+- [nightly](https://github.com/mozilla-firefox/firefox/blob/main/gfx/wgpu_bindings/Cargo.toml),
+
+We welcome reports of security vulnerabilities in any of these released
+versions or in the latest code on the `trunk` branch.
+
+
+## Reporting a Vulnerability
+
+Although not all vulnerabilities in WGPU will affect Firefox, Mozilla accepts
+all vulnerability reports for WGPU and directs them appropriately. Additionally,
+Mozilla serves as the CVE numbering authority for the WGPU project.
+
+To report a security problem with WGPU, create a bug in Mozilla's Bugzilla
+instance in the
+[Core :: Graphics :: WebGPU](https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=Graphics%3A+WebGPU&groups=core-security&groups=gfx-core-security)
+component.
+
+**IMPORTANT: For security issues, please make sure that you check the box
+labelled "Many users could be harmed by this security problem".** We advise
+that you check this option for anything that is potentially
+security-relevant, including memory safety, crashes, race conditions, and
+handling of confidential information.
+
+Review Mozilla's [guides on bug
+reporting](https://bugzilla.mozilla.org/page.cgi?id=bug-writing.html) before
+you open a bug.
+
+Mozilla operates a [bug bounty
+program](https://www.mozilla.org/en-US/security/bug-bounty/). Some
+vulnerabilities in this project may be eligible.