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weird permission problem with a stage4 install[SOLVED]
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truc
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PostPosted: Sat Nov 17, 2012 4:49 pm    Post subject: weird permission problem with a stage4 install[SOLVED] Reply with quote

Hello,

I'm running into a weird permission problems after chroot'ing into a stage4 install
Code:
sysresccd ~ # sudo
sudo: unable to stat /etc/sudoers: Permission denied
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin
sysresccd ~ # ls -ld /etc/ /etc/sudoers
drwxr-xr-x 1 root root 2088 Nov 17 14:47 /etc/
-r--r----- 1 root root 2849 Sep 25 14:40 /etc/sudoers
sysresccd ~ # ls -l $(which sudo)
---s--x--x 2 root root 108496 Sep 25 14:40 /usr/bin/sudo


qn other one:
Code:
sysresccd ~ # id truc
uid=1000(truc) gid=1000(truc) groups=1000(truc),18(audio),19(cdrom),27(video),85(usb)
sysresccd ~ # su - truc
Unable to cd to '/home/truc'
sysresccd ~ # ls -ld /home /home/truc
drwxr-xr-x 1 root root  16 Sep 25 22:59 /home
drwxr-xr-x 1 truc truc 130 Nov 11 19:07 /home/truc


I did a bit of research and it actually looks like the same problem as detailed on this stackexchange question.

The thing is that I was also trying to play with btrfs, this may or may not be the root of the problem(*), I have some time at hands and I would like to understand what's going on, so if you have any idea on how to debug this further that would be great!


(*) -> on the same btrfs 'storage pool'(?), but on a different subvolume, I've made a quick debian installation (with debootstrap) and I have *not* run into similar problems


Here are some additionnal informations:
Code:
/dev/sda3 on /mnt/gentoo type btrfs (rw,noatime,nodiratime,subvol=@g_root,compress=lzo,ssd_spread,discard)
/dev/sda3 on /mnt/gentoo/var/log type btrfs (rw,noatime,nodiratime,subvol=@g_vlog,compress=lzo,ssd_spread,discard)
/dev/sda3 on /mnt/gentoo/home type btrfs (rw,noatime,nodiratime,subvol=@home,compress=lzo,ssd_spread,discard)
/proc on /mnt/gentoo/proc type none (rw,bind)
/dev on /mnt/gentoo/dev type none (rw,bind)
/sys on /mnt/gentoo/sys type none (rw,bind)


I'm running a sysrescue liveusb, kernel&btrfs tools version:
Code:
root@sysresccd /mnt % uname -a
Linux sysresccd 3.2.33-std311-amd64 #2 SMP Wed Oct 31 07:31:30 UTC 2012 x86_64 Intel(R) Core(TM) i5-2467M CPU @ 1.60GHz GenuineIntel GNU/Linux

Code:
 btrfs --version
Btrfs Btrfs v0.19


Thanks in advance!
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truc
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PostPosted: Wed Nov 21, 2012 10:45 am    Post subject: Reply with quote

eh! this was stupid of me! I had checked permissions on /etc and /home but not on the root itself:
Code:
drwx------ 1 root root 156 Nov 13 23:25 /


Which was obviously missing some Read&Execute bits. (a simple chmod go+rx / fixed the problem!).

This was in some way related to btrfs which for some reasons seems to ignore your umask and set new subvolume permissions to 700 by default.

/me feels stupid :oops: , anyway :lol:
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Last edited by truc on Thu Nov 22, 2012 11:56 am; edited 2 times in total
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mcsurui
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PostPosted: Thu Nov 22, 2012 6:29 am    Post subject: mcsurui Reply with quote

The problem I have had, I can't solve.
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truc
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PostPosted: Thu Nov 22, 2012 12:05 pm    Post subject: Re: mcsurui Reply with quote

mcsurui wrote:
The problem I have had, I can't solve.


I am not sure you're having the same problem since I just gave the solution in my post above and it looks like that wasn't enough for you.

You might want to start a new thread explaining exactly what your problem really is.
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