How to root your own AOSP build?

user_129805 0
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We have root access to our AOSP build, when we use:

lunch smarc_mx8mq-eng

How can we get a root shell after using:

lunch smarc_mx8mq-user

This can be any form of temporary hack to the AOSP source, but the build must remain a user build.

I've read about / being mounted with nosetuid, but that doesn't seem to be the case for us:

smarc_mx8mq:/ # mount 
/dev/block/mmcblk1p5 on / type ext4 (ro,seclabel,relatime,block_validity,delalloc,barrier,user_xattr,acl,inode_readahead_blks=8)

(I will check this again once I have built a user build.)

What's the best way of rooting our own AOSP build?

android-10.0 android-source root
1 Answers

The solution was to flash the boot-debug.img into the boot partition.

$ sudo fastboot flash boot boot-debug.img
target reported max download size of 419430400 bytes
sending 'boot_a' (43252 KB)...
OKAY [  2.270s]
writing 'boot_a'...
OKAY [  2.163s]
finished. total time: 4.433s
...
$ adb shell
smarc_mx8mq:/ $ exit
$ adb root
restarting adbd as root
$ adb shell
smarc_mx8mq:/ #
user_1298050
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