If I run:
busybox grep " _text" /proc/kallsyms
on my Android device, I get:
00000000 T _text
Does anybody know the reason?
Why do I get a zero Android kernel address?
1.4k views Asked by Jansen At
1
There are 1 answers
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Android kernels generally do not expose symbol values.
Checkout this upstream for specific implementation and discussion.
tl;dr:
As exposing kernel symbol locations makes exploits easier (e.g. an attacker can look up the exact function he wants to change instead of browsing through the entire kernel image), the defaults in the Android OS are not to expose kernel symbols to unprivileged users
P.S
If you have root privileges on this device, you can do
to disable this restriction.