[Squashfs-devel] Problem using multiple users on squashfs

[Pedro P. V. <ped...@se...>]

Hello,

I have a problem using multiple users on a system embedded with rootfs
based on squashfs.

In the user database (/etc/passwd and /etc/shadow files) the following
users are correctly configured:

root with uid=0
user1 with uid=101
user2 with uid=102

The squashfs file system is created from the tmp_dir directory, which
contains the root file system of the embedded system:

sudo chown 101 tmp_dir
sudo mksquashfs4.0 tmp_dir squashfs.img -noappend -no-recovery

At system startup, the squashfs image is mounted and becomes the root
file system:

mount squashfs.img /new_root -o ro,loop
cd /new_root
mkdir -p old_root
pivot_root . old_root
exec chroot . /linuxrc

I enter the system and execute:

# su user1

And everything is OK.

But if I execute:

# su user2

Returns the following error:

su: can't execute '/bin/bash': Permission denied

Si al crear el sistema de ficheros se hace:

And if the file system is created in this way (only change the owner of
the tmp_dir directory):

sudo chown 102 tmp_dir
sudo mksquashfs4.0 tmp_dir squashfs.img -noappend -no-recover

I enter the system and execute:

# su user1

Returns the following error:

su: can't execute '/bin/bash': Permission denied

But if I execute:

# su user2

And everything is OK.

Anyone know how to use multiple users in squashfs?

Thank you in advance.

Regards,

Pedro