nested Binder calls

[hakkunam...@gmail.com]

Just got curious

ABC process calls binder function() in XYZ process, and XYZ process from that function calls another binder function() from LMN process.

what would be the binder identity of the call in the LMN process function() ?

[Chris Tate]

Binder.getCallingUid() always reports the proximate caller.

Suppose that A makes a remote call into B, and B immediately makes a remote call into C; and none of these ever call Binder.clearCallingIdentity().

B sees getCallingUid() == A's uid.

C sees getCallingUid() == B's uid.

Caller identity is not transitive.  For example, this means that if the system process calls into your app process, and then you turn around and call back into the system, it still properly recognizes your app as being the caller.

In your example, while running function() in the LMN process, Binder.getCallingUid() reports XYZ's uid.

--

christopher tate

android framework engineer

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[hakkunam...@gmail.com]

Thanks mate, for the wonderful and detailed explanation.

thats exactly what am scratching my head for ...

-Dude.