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| author | Daniel Micay <danielmicay@gmail.com> | 2020-09-29 03:23:39 -0400 |
|---|---|---|
| committer | Daniel Micay <danielmicay@gmail.com> | 2020-09-29 03:23:39 -0400 |
| commit | f1faf19f402af4f97c3de9d8e7e3c294767ac0bf (patch) | |
| tree | 7c09b27aeedecf56234860df161f4d07de5e2fbb /static | |
| parent | de2c4675850a1b16f8ee55a29c641ce37fe5e5f1 (diff) | |
baseband isolation section
Diffstat (limited to 'static')
| -rw-r--r-- | static/faq.html | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/static/faq.html b/static/faq.html index 96586b69..78455186 100644 --- a/static/faq.html +++ b/static/faq.html @@ -92,6 +92,7 @@ <li><a href="#firewall">Does GrapheneOS provide a firewall?</a></li> <li><a href="#ad-blocking">How can I set up system-wide ad-blocking?</a></li> <li><a href="#ad-blocking-apps">Are ad-blocking apps supported?</a></li> + <li><a href="#baseband-isolation">Is the baseband isolated?</a></li> </ul> </li> <li> @@ -731,6 +732,33 @@ example implementing SOCKS5 forwarding, which can be used to forward to apps like Orbot (Tor).</p> + <h3 id="baseband-isolation"> + <a href="#baseband-isolation">Is the baseband isolated?</a> + </h3> + + <p>Yes, the baseband is isolated on all of the officially supported devices. Memory + access is partitioned by the IOMMU and limited to internal memory and memory shared + by the driver implementations. The baseband on the officially supported devices with a + Qualcomm SoC implements Wi-Fi and Bluetooth as internal sandboxed processes rather + than having a separate baseband for those like earlier devices.</p> + + <p>Earlier generation devices we used to support prior to Pixels had Wi-Fi + Bluetooth + implemented on a separate SoC. This was not was not properly contained by the stock OS + and we put substantial work into addressing that problem. However, that work has been + obsoleted now that Wi-Fi and Bluetooth are provided by the SoC on the officially + supported devices.</p> + + <p>A component being on a separate chip is orthogonal to whether it's isolated. In + order to be isolated, the drivers need to treat it as untrusted. If it has DMA access + that needs to be contained via IOMMU and the driver needs to treat the shared memory + as untrusted, as it would data received another way. There's a lot of attack surface + between the baseband and the kernel/userspace software stack connected to it. OS + security is very relevant to containing hardware components including the radios and + the vast majority of the attack surface is in software. The OS relies upon the + hardware and firmware to be able to contain components but ends up being primarily + responsible for it due to control over the configuration of shared memory and the + complexity of the interface and the OS side implementation.</p> + <h2 id="day-to-day-use"> <a href="#day-to-day-use">Day to day use</a> </h2> |
