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this post was submitted on 03 Oct 2024
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DeGoogle Yourself
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This is literally nothing special, as all user-installed apps are denied access to identifiers like the IMEI and MAC address since Android 10. Since GrapheneOS isolates Play services in the Android application sandbox, they don't have access to any of these identifiers either.
That's not how memory corruption exploits work. These can occur anywhere in the system, and just need to be triggered by an attacker. This doesn't require you to install an app, receiving a rogue message might for example be enough to exploit a memory vulnerability in the SMS app. Visiting a rogue website, which loads malicious JavaScript can be enough to trigger a memory corruption vulnerability in the Chromium WebView. That's why GrapheneOS doesn't just use hardened_malloc, but it also disables the JavaScript JIT compiler in Vanadium by default, and offers a toggle in the settings to disallow JavaScript JIT compilation in all apps making use of the system WebView component.
Very nice. Can I use the much smaller codebase of microG instead of Google's? Even you do not know how Play Services actually works, and that's a problem.
Further, a memory exploit that leads to compromise would need a chain of privilege escalation. There's a lot in the way of making that trivial even on stock Android. And you know what helps reduce risk of exploit? Smaller codebases.
If you only care about security, you should keep Play Services isolated in a separate profile. That way, even if there happens to be a memory corruption vulnerability in Play services, which isn't caught by hardened_malloc or the hardware MTE in newer devices with ARMv9 chips, the rest of your system would still be safe, since Play services aren't running as root, and in order to compromise the entire system, there would need to be a privilege escalation vulnerability in all of Android, not just Play services.
Why does CalyxOS include the F-Droid privileged extension then? It's yet another component running with elevated permissions and unnecessarily increasing attack surface. Why does it include Google's eUICC component with elevated privileges and no proper sandboxing?
Err... That component appears to be built from source per Calyx's Gradle rules? The source is pulled from here: https://android.googlesource.com/platform/frameworks/base/+/refs/heads/main/telephony/java/android/telephony/euicc
My hardware is too old to support MTE. I'm running a pixel 3 because I'm more worried about damaging our earthly environment with this constant hardware churn.
I'm sorry you're unhappy that I'm happy. I'm still able to run Android 14 in a reasonably secure manner, I'm able to exchange information with other people easily, without Google getting much information from me, and that's satisfactory. My actual security relevant machinations happen on my much better protected laptop.
Thanks for your input, have a nice day.
That's apparently not the entire thing though. I haven't used CalyxOS in a long time, could go to the settings menu for adding a new eSIM and take a screenshot of it?
Oh I'm absolutely not. I'm glad you found an OS you like, I just pointed out that GrapheneOS is far superior in terms of privacy and security, and therefore probably the better choice, but you are obviously free to use whatever suits your needs and makes you happy. And it's better than the stock OS I guess.
How do you protect a laptop to be more secure than a modern mobile device? Desktop operating systems are inherently less secure, since they lack proper application sandboxing, they often don't even have mandatory access control mechanisms (such as SELinux or AppArmor) in place and don't have a good way of verifying the boot image. Secure Boot is broken and essentially useless, and can't be compared to Android Verified Boot whatsoever. TPMs aren't secure either, and can't even remotely be compared with proper secure elements such as the Google Titan M2 or Apple's Secure Enclave. Do you use QubesOS, or how did you achieve better protection on your laptop compared to your smartphone?