aid_root

1. system/extras/su/su.c
/*
myuid = getuid();
if (myuid != AID_ROOT && myuid != AID_SHELL) {
fprintf(stderr,"su: uid %d not allowed to su\n", myuid);
return 1;
} */

2. Z:\W802_3070\QRD8X25Q_3070\android\device\qcom\msm7627a\fstab.qcom
/dev/block/platform/msm_sdcc.3/by-num/p17         /system      ext4    ro,barrier=1                                 wait
/dev/block/platform/msm_sdcc.3/by-num/p21         /data        ext4    nodev,barrier=1,noauto_da_alloc,nomblk_io_submit,errors=panic       wait,check,encryptable=footer
/dev/block/platform/msm_sdcc.3/by-num/p18         /cache       ext4    nosuid,nodev,barrier=1                       wait
/dev/block/platform/msm_sdcc.3/by-num/p15         /persist     ext4    nosuid,nodev,barrier=1                       wait
3. system/core/rootdir/init.rc
a) chmod 4755 /system/xbin/su