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docs/system_hardening_features.md

 # Introduction
 
 This is a list of current and planned Chrome OS security features. Each feature is listed together with its rationale and status. This should serve as a checklist and status update on Chrome OS security.
 
 
 
 # Details
 
 ## General Linux features
 
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 | disable ACPI custom\_method | needs config and functional test | Frustrate kernel exploits that depend on root access to physical memory |           | Issue 23759 (on Google Code) |
 | unreadable kernel files | needs config and functional test | Frustrate automated kernel exploits that depend access to various kernel resources |           | Issue 23761 (on Google Code) |
 | blacklist rare network modules | needs functional test | Reduce attack surface of available kernel interfaces. |
 | syscall filtering | needs functional testing | Reduce attack surface of available kernel interfaces. |           | Issue 23150 (on Google Code) |
 | vsyscall ASLR | medium priority | Reduce ROP target surface. |
 | Limited use of suid binaries | implemented | Potentially dangerous, so minimize use. | [security\_SuidBinaries](http://git.chromium.org/gitweb/?p=chromiumos/third_party/autotest.git;a=tree;f=client/site_tests/security_SuidBinaries) |
 
 ## Chrome OS specific features
 
   * We use `minijail` for sandboxing:
-    * [Design doc](http://www.chromium.org/chromium-os/chromiumos-design-docs/system-hardening#Detailed_Design_73859539098644_6227793370126997)
+    * [Design doc](https://www.chromium.org/chromium-os/chromiumos-design-docs/system-hardening#Detailed_Design_73859539098644_6227793370126997)
     * Issue 380 (on Google Code)
   * Current sandboxing status:
 
 |  |  |  |  | **Exposure** |  |  |  |  | **Privileges** |  | **Sandbox** |
 |:-|:-|:-|:-|:-------------|:-|:-|:-|:-|:---------------|:-|:------------|
 | **Service/daemon** | **Overall status** | **Usage** | **Comments** | **Network traffic** | **User input** | **DBus** | **Hardware (udev)** | **FS (config files, etc.)** | **Runs as**    | **Privileges needed?** | **uid**     | **gid**     | **Namespaces** | **Caps**    | **seccomp\_filters** |
 | udevd | Low pri | Listens to udev events via netfilter socket |  | No           | No | No | Yes | No | root           | Probably | No          | No          | No          | No          | No          |
 | session-manager | <font color='yellow'>P2</font>|  | Launched from /sbin/session\_manager\_setup.sh | No           | No | Yes | No | No | root           | Probably | No          | No          | No          | No          | No          |
 | rsyslogd | Low pri | Logging |  | No           | No | No | No | Yes | root           | Probably | No          |             | No          | No          | No          |
 | dbus-daemon | Low pri | IPC | Listens on Unix domain socket | Unix domain socket |  | Yes |  |  | messagebus     | Yes | Yes         | Yes         | No          | No          | No          |
@@ skipping 27 matching lines @@
 |  |  |  |  | **Exposure** |  |  |  |  | **Privileges** |  | **Sandbox** |
 
 Enforced by [security\_SandboxedServices](http://git.chromium.org/gitweb/?p=chromiumos/third_party/autotest.git;a=tree;f=client/site_tests/security_SandboxedServices)
 
 # References
 
   * https://wiki.ubuntu.com/Security/Features
   * http://wiki.debian.org/Hardening
   * http://www.gentoo.org/proj/en/hardened/hardened-toolchain.xml
   * http://www.awe.com/mark/blog/20101130.html