# macOS Sandbox
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## Basic Information
### Start Sandbox
**Processes are not born sandboxed on macOS: unlike iOS**, where the sandbox is applied by the kernel before the first instruction of a program executes, on macOS **a process must elect to place itself into the sandbox.**
Processes are automatically Sandboxed from userland when they start if they have the entitlement: `com.apple.security.app-sandbox`. For a detailed explanation of this process check:
{% content-ref url="macos-sandbox-debug-and-bypass.md" %}
[macos-sandbox-debug-and-bypass.md](macos-sandbox-debug-and-bypass.md)
{% endcontent-ref %}
### **Check PID Privileges**
[According to this](https://www.youtube.com/watch?v=mG715HcDgO8\&t=3011s), the **`sandbox_check`** (it's a `__mac_syscall`), can check **if an operation is allowed or not** by the sandbox in a certain PID.
The [**tool sbtool**](http://newosxbook.com/src.jl?tree=listings\&file=sbtool.c) can check if a PID can perform a certain action:
```bash
sbtool mach #Check mac-ports (got from launchd with an api)
sbtool file /tmp #Check file access
sbtool inspect #Gives you an explaination of the sandbox profile
sbtool all
```
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