有的user用户版本的log 不全，且push/pull某些文件或者属性文件

常常会遇到权限不够的情况，给调试带来很多便：

对于user 版本adb shell 开启的还是shell 权限，而不是root 权限，
如果您需要root 权限，需要再改一下system/core/adb/adb.c 里面的should_drop_privileges()
这个函数，在#ifndef ALLOW_ADBD_ROOT 时return 0; 而不是return 1; 即可。

判断是否降低权限：

static int should_drop_privileges() {
#ifndef ALLOW_ADBD_ROOT
    return 1;
#else /* ALLOW_ADBD_ROOT */
    int secure = 0;
    char value[PROPERTY_VALUE_MAX];

   /* run adbd in secure mode if ro.secure is set and
    ** we are not in the emulator
    */
    property_get("ro.kernel.qemu", value, "");
    if (strcmp(value, "1") != 0) {
        property_get("ro.secure", value, "1");
        if (strcmp(value, "1") == 0) {
            // don't run as root if ro.secure is set...
            secure = 1;

            // ... except we allow running as root in userdebug builds if the
            // service.adb.root property has been set by the "adb root" command
            property_get("ro.debuggable", value, "");
            if (strcmp(value, "1") == 0) {
                property_get("service.adb.root", value, "");
                if (strcmp(value, "1") == 0) {
                    secure = 0;
                }
            }
        }
    }
    return secure;
#endif /* ALLOW_ADBD_ROOT */
}

具体怎么降低权限：

    if (should_drop_privileges()) {
        struct __user_cap_header_struct header;
        struct __user_cap_data_struct cap;

        if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) != 0) {
            exit(1);
        }

        /* add extra groups:
        ** AID_ADB to access the USB driver
        ** AID_LOG to read system logs (adb logcat)
        ** AID_INPUT to diagnose input issues (getevent)
        ** AID_INET to diagnose network issues (netcfg, ping)
        ** AID_GRAPHICS to access the frame buffer
        ** AID_NET_BT and AID_NET_BT_ADMIN to diagnose bluetooth (hcidump)
        ** AID_SDCARD_R to allow reading from the SD card
        ** AID_SDCARD_RW to allow writing to the SD card
        ** AID_MOUNT to allow unmounting the SD card before rebooting
        ** AID_NET_BW_STATS to read out qtaguid statistics
        */
        gid_t groups[] = { AID_ADB, AID_LOG, AID_INPUT, AID_INET, AID_GRAPHICS,
                           AID_NET_BT, AID_NET_BT_ADMIN, AID_SDCARD_R, AID_SDCARD_RW,
                           AID_MOUNT, AID_NET_BW_STATS };
        if (setgroups(sizeof(groups)/sizeof(groups[0]), groups) != 0) {
            exit(1);
        }

        /* then switch user and group to "shell" */
        if (setgid(AID_SHELL) != 0) {
            exit(1);
        }
        if (setuid(AID_SHELL) != 0) {
            exit(1);
        }

        /* set CAP_SYS_BOOT capability, so "adb reboot" will succeed */
        header.version = _LINUX_CAPABILITY_VERSION;
        header.pid = 0;
        cap.effective = cap.permitted = (1 << CAP_SYS_BOOT);
        cap.inheritable = 0;
        capset(&header, &cap);

        D("Local port disabled\n");
    }