Not able to login as root user with the RFS generated

[vivsundar]

I am using a imx6 based custom board 
Made the build system ready using the following guide: https://www.nxp.com/docs/en/user-guide/IMX_YOCTO_PROJECT_USERS_GUIDE.pdf

After cloning the yocto source, initialized the build with: DISTRO=fsl-imx-fb MACHINE=imx6dlsabresd source imx-setup-release.sh -b build_imx

Then started the build using: bitbake -k core-image-minimal.

The core-image-minimal-xxxx-xxx.tar is generated.  But when the board is booted with this RFS image, it did not accept any password for the root user.

I checked the local.conf. It has:
EXTRA_IMAGE_FEATURES ?= "debug-tweaks"
Yet it did not accept a blank password or any other password.

I had a look at /etc/shadow file.  The root user's password field is empty. 
I tried to change the password manually in /etc/shadow file, but it did not work out.

Added the following line in local.conf

INHERIT += "extrausers"

EXTRA_USERS_PARAMS = "usermod -p '\$6\$rYOC7GCfUdPrKZdt\$GbxrFaYxl0Wdk9ZyuR/HarDrChctvbHQqdmdtGS.dxCq0FUxLVdxgvdBCoofs4NLcc/0GZ3pbMcrNeT3KwCFk/' root;"

I can see that when i add this line the /etc/shadow file is updated with the password hash.  But that too did not work.

Can any one point out what should i do to fix the login issue.

[vivsundar · Accepted solution]

the root cause of the issue is:

1. sysvinit version that comes with the RFS image: Sysvinit version 3.01 does not allow root login through NFS boot. But sysvinit version 2.88 works fine with the existing NFS boot settings.

2. So I started working on the nfsboot parameters, and found that two new nfs parameters had to be added: no_root_squash,insecure

The screen shot shows the nfs server side parameters.

[joanxie]

did you find wic image in your images file? after you flash this image to the board, the password is "root", pls try this, if I misunderstand your question, pls tell me

[vivsundar]

Hi 

Thanks for the reply,

I am booting the board through NFS.  So what I did is that I mounted the partition in core-image-minimal-xxxx-xxx.wic through:

1) losetup -o 33554432 /dev/loop1 core-image-minimal-imx6dlsabresd-20230110062552.rootfs.wic

2) mount /dev/loop1 /mnt/ 

3) copied the contents of the /mnt/ folder to my NFS folder.  After booting my board and tried to login I see the "Login incorrect" message for user: root and password: root.

Note: I have changed the default systemd to sysvinit in "meta-imx/meta-sdk/conf/distro/include/fsl-imx-preferred-env.inc"  will that cause any problems?

[joanxie]

1) refer to the link https://docs.yoctoproject.org/ref-manual/classes.html#extrausers-bbclass

2)remove debug-weaks in the local.conf

This is a reference local.conf change; where the debug-tweaks has been deleted and line 30-35 showing how to set root password and add user named as user1; which has sudo capability.

MACHINE ??= 'imx6ulevk'
DISTRO ?= 'fsl-imx-fb'
PACKAGE_CLASSES ?= "package_rpm"
USER_CLASSES ?= "buildstats image-mklibs image-prelink"
PATCHRESOLVE = "noop"
BB_DISKMON_DIRS ??= "\
    STOPTASKS,${TMPDIR},1G,100K \
    STOPTASKS,${DL_DIR},1G,100K \
    STOPTASKS,${SSTATE_DIR},1G,100K \
    STOPTASKS,/tmp,100M,100K \
    ABORT,${TMPDIR},100M,1K \
    ABORT,${DL_DIR},100M,1K \
    ABORT,${SSTATE_DIR},100M,1K \
    ABORT,/tmp,10M,1K"
PACKAGECONFIG_append_pn-qemu-native = " sdl"
PACKAGECONFIG_append_pn-nativesdk-qemu = " sdl"
CONF_VERSION = "1"

DL_DIR ?= "/home/nxa15297/mydata/aosp/YoctoDN-4.9/downloads"
ACCEPT_FSL_EULA = "1"

BOOT_SPACE = "65536"
IMAGE_OVERHEAD_FACTOR = "1.5"

CORE_IMAGE_EXTRA_INSTALL += " cryptsetup cryptodev-module cryptodev-tests openssh dhcp-client dhcp-server connman"
TOOLCHAIN_HOST_TASK_append = " nativesdk-python nativesdk-python-pycrypto"

IMAGE_INSTALL_append = " sudo"

INHERIT += " extrausers"
EXTRA_USERS_PARAMS = "\
 usermod -P 1876*18 root;\
 useradd -P 2015*08 user1;\
 usermod -a -G sudo user1;\
 "‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

refer to the document

"https://community.nxp.com/t5/iMX-and-Vybrid-Support/i-MX6UL-Yocto-Rootfs-how-to-add-user-and-enable-..."

if you couldn't access it, pls refer to:

To set up proper sudo access for use1, bootup the system and login as root using the above root password. Then using visudo to modify the following line as:

## Uncomment to allow members of group sudo to execute any command                   
%sudo  ALL=(ALL) NOPASSWD: ALL ‍‍‍‍