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0 pointsAndromxda8mo ago0 comments

> For what it is worth, Wikipedia mentions the Pixel 6 on the eFuse page https://en.wikipedia.org/wiki/EFuse

The Pixel 6 is only mentioned in regards to anti-rollback protection. This has nothing to do with unlocking and later relocking the bootloader. Pixels have always supported relocking the bootloader with a custom root of trust, i.e. custom AVB signing keys used by a custom, user-installed operating system.

https://source.android.com/docs/security/features/verifiedbo...

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j4hdufd88mo ago

The Pixel 6 is mentioned specifically about eFuses which is the technical detail that caught my attention in this thread.

> The Xbox 360, Nintendo Switch, Pixel 6 and Samsung Galaxy S22 are known for using eFuses this way.[8]

Anti-rollback protection is a security feature, eFuses are hardware primitives that can be used to implement it. Bootloader locking is another security feature that can be implemented with eFuses.

If you have any data denying the use of eFuses in the Pixel 6, please share it, that is what I was interested in this sub-thread. I really did not understand the relevance and the correctness of your comment.

AndromxdaOP8mo ago

I had the same misunderstanding of your comment, as this other commenter https://news.ycombinator.com/item?id=45256978

I thought you claimed that Pixels also used eFuses to disable certain features after unlocking the bootloder once, like Samsung devices do. That's why I pointed out that Pixel devices have always had support for relocking the bootloader with a custom root of trust.

Your response to this comment https://news.ycombinator.com/item?id=45244933 made it seem that way, because you appeared to disagree that "Pixel devices don't have anything like the Samsung Knox eFuse, which blows after running a third-party bootloader".

I guess that was a misunderstanding.

j4hdufd88mo ago

I appreciate the clarification, thank you :) I'm glad we're on the same page. Always curious to learn new details from others, hence my insistence heh

j / k navigate · click thread line to collapse

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j4hdufd88mo ago

The Pixel 6 is mentioned specifically about eFuses which is the technical detail that caught my attention in this thread.

> The Xbox 360, Nintendo Switch, Pixel 6 and Samsung Galaxy S22 are known for using eFuses this way.[8]

Anti-rollback protection is a security feature, eFuses are hardware primitives that can be used to implement it. Bootloader locking is another security feature that can be implemented with eFuses.

AndromxdaOP8mo ago

I had the same misunderstanding of your comment, as this other commenter https://news.ycombinator.com/item?id=45256978

I guess that was a misunderstanding.

j4hdufd88mo ago

I appreciate the clarification, thank you :) I'm glad we're on the same page. Always curious to learn new details from others, hence my insistence heh

j / k navigate · click thread line to collapse