198b80a354
This change sets up the sandbox to build RendererProcessPolicy and BPFBasePolicy on Android. BPFBasePolicy now also creates a BaselinePolicyAndroid on Android builds. The renderer main platform delegate now checks if it's in a renderer process and sets the RendererProcessPolicy if it is. There are no changes to the seccomp policy on other processes. The seccomp policy itself is becoming slightly more permissive on Android as there are some syscalls allowed in RendererProcessPolicy that are currently not allowed on BaselinePolicyAndroid (setrlimit, sched_get_priority_max, sched_get_priority_min, times, uname). This change is guarded behind a feature flag so future CLs can properly clean up all the allowed syscalls, as well as determine which syscalls in AndroidBaselinePolicy can now be blocked as they're only needed by the renderer. Bug: 739879 Change-Id: I01f51d9dc947467d0a1f5b00a4b91625f246a61e Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4902220 Reviewed-by: Matthew Denton <mpdenton@chromium.org> Commit-Queue: Liza Burakova <liza@chromium.org> Reviewed-by: Alex Moshchuk <alexmos@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org> Cr-Commit-Position: refs/heads/main@{#1205405}
Sandbox Library
This directory contains platform-specific sandboxing libraries. Sandboxing is a technique that can improve the security of an application by separating untrustworthy code (or code that handles untrustworthy data) and restricting its privileges and capabilities.
Each platform relies on the operating system's process primitive to isolate code into distinct security principals, and platform-specific technologies are used to implement the privilege reduction. At a high-level:
mac/uses the Seatbelt sandbox. See the detailed design for more.linux/uses namespaces and Seccomp-BPF. See the detailed design for more.win/uses a combination of restricted tokens, distinct job objects, alternate desktops, and integrity levels. See the detailed design for more.
Built on top of the low-level sandboxing library is the
//sandbox/policy component, which provides concrete
policies and helper utilities for sandboxing specific Chromium processes and
services. The core sandbox library cannot depend on the policy component.