tree 494cd028b6b22b2cb1fed2e35154f83f45db36f2
parent 821678e1c7bd0af12fa4adc314c9024def9ba7c0
author Alex Klyubin <klyubin@google.com> 1375733038 -0700
committer Alex Klyubin <klyubin@google.com> 1377112527 -0700

Fix run-as which was broken in Android 4.3

In Android 4.3 the run-as binary no longer has the SUID/SGID bits
set. Instead, it requires to be installed with setuid and setgid
file-based capabilities. As a result of the above two changes, the
binary no longer executes as root when invoked by the "shell" user
but can still change its UID/GID to that of the target package.

Unfortunately, run-as attempts to chdir into the target package's
data directory before changing its effective UID/GID. As a result,
when run-as is invoked by the "shell" user, the chdir operation
fails.

The fix is for run-as to chdir after changing the effective UID/GID
to those of the target package.

Bug: 10154652

(cherry picked from commit f2904a7b63c2005ab588a9ba2fb309e73200ec81)

Change-Id: I0f6cb9efd49f5c2c491f7aa1d614d700a5ec2304