ca6ec4337d
Recenly, Debian based distribution kernels started activating the Tomoyo Linux Security Module by default. Even if it is not used, this changes the behavior of `/dev/fd` (pointing to `/proc/self/fd` by default), which Sandbox2 needs during `execveat()`. As a result, Sandbox2 and Sandboxed API always fail without one of the following conditions - `/proc` mounted within the sandboxee - `/dev` mounted - `/dev/fd` symlinked to `/proc/self/fd` in the sandboxee's mount namespace Some code pointers to upstream Linux 5.12.2: - https://elixir.bootlin.com/linux/v5.12.2/source/fs/exec.c#L1775 - https://elixir.bootlin.com/linux/v5.12.2/source/security/tomoyo/tomoyo.c#L107 - https://elixir.bootlin.com/linux/v5.12.2/source/security/tomoyo/domain.c#L729 To find out whether your system has Tomoyo enabled, use this command, similar to what this change does in code: ``` $ cat /sys/kernel/security/lsm | grep tomoyo && echo "Tomoyo active" capability,yama,apparmor,tomoyo Tomoyo active ``` The config setting `CONFIG_DEFAULT_SECURITY` controls which LSMs are built into the kernel by default. PiperOrigin-RevId: 372919524 Change-Id: I2181819c04f15f57d96c44ea9977d0def4a1b623
Copyright 2019-2021 Google LLC.
What is Sandboxed API?
The Sandboxed API project (SAPI) makes sandboxing of C/C++ libraries less burdensome: after initial setup of security policies and generation of library interfaces, a stub API is generated, transparently forwarding calls using a custom RPC layer to the real library running inside a sandboxed environment.
Additionally, each SAPI library utilizes a tightly defined security policy, in contrast to the typical sandboxed project, where security policies must cover the total syscall/resource footprint of all its libraries.
Documentation
Developer documentation is available on the Google Developers site for Sandboxed API.
There is also a Getting Started guide.
Getting Involved
If you want to contribute, please read CONTRIBUTING.md and send us pull requests. You can also report bugs or file feature requests.
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