9d185cd68f
This commit adds support for priority inheritance mutexes on all Linux platforms but enables it only on Android at build time. The feature is enabled only on kernel versions >= 6.1 and is further gated behind a feature flag to monitor its effect prior to full enablement. Currently, the background priority worker threads feature is purely a function of if priority inheritance locks are supported. But in order to gather field data on the effects of running worker threads at background priority once priority inheritance mutexes are enabled, the two features need to be decoupled. Thus, the enablement of background priority worker threads is gated behind a separate feature flag. Bug: 384902323 Change-Id: I2a59549aaedfb27127f241103ab05a7f95d8c631 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6299348 Commit-Queue: Anand Ravi <anandrv@google.com> Reviewed-by: Matthew Denton <mpdenton@chromium.org> Reviewed-by: Benoit Lize <lizeb@chromium.org> Cr-Commit-Position: refs/heads/main@{#1438818}
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.