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Su woes in a gentoo chroot on asus tf700 [SOLVED]
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dwardo
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PostPosted: Sat Mar 16, 2013 9:38 am    Post subject: Su woes in a gentoo chroot on asus tf700 [SOLVED] Reply with quote

Hello,

I've sucessfully installed gentoo in a chroot on my asus tf700 (Infinity) and my only woe is that the su command does not work for my "normal" user.

I get a :
setgit: operation not permitted error

I've been googling for a while (>1 week) and have checked that:
* normal user is in wheel group
* permission of /bin/su are correct "-rws--x--x"
* permission of /bin/sh are correct
* modified /etc/securetty to add the pts/[0-9] as those are the tty in android terminal emulator
* ... (read the specific su issues threads on the forums)

I actually see no other chroot on android instructions where people use su (so I guess they stay as root in the chroot...)

I finally went for a strace -o strace.lo su

And when analysing the strace.log file found the first error to be and EACCES when trying to open socket to file /dev/log
Followed by the EPERM error when running setgid32(0)

Turns out on the tf700 /dev/log is not a socket file... but a directory containning 4 things:
crw-rw-rw- 1 root log 10, 28 11 mars 22/13 system
crw-rw-rw- 1 root log 10, 29 11 mars 22/13 radio
crw-rw-rw- 1 root log 10, 31 11 mars 22/13 main
crw-rw-rw- 1 root log 10, 30 11 mars 22/13 events

Could this be the reason the setgid32(0) fails because the preceding acces to /dev/log failed ?

Thanks for any feedback and possible solutions

Regards


Last edited by dwardo on Sun Mar 17, 2013 8:22 pm; edited 1 time in total
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krinn
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PostPosted: Sat Mar 16, 2013 11:11 am    Post subject: Reply with quote

Quote:
I actually see no other chroot on android instructions where people use su (so I guess they stay as root in the chroot...)


Maybe because it's not need :
root: login user
user: exit
root:

why would you want user to use su then ?

For your problem, i would dig /etc/login.defs where you could tweak log file...
But as i said, i'm not sure if anyone has a need for su in a chroot.
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dwardo
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PostPosted: Sat Mar 16, 2013 5:42 pm    Post subject: Reply with quote

krinn wrote:
Quote:
I actually see no other chroot on android instructions where people use su (so I guess they stay as root in the chroot...)


Maybe because it's not need :
root: login user
user: exit
root:

why would you want user to use su then ?

For your problem, i would dig /etc/login.defs where you could tweak log file...
But as i said, i'm not sure if anyone has a need for su in a chroot.


Well I setup the entire environment and login as my user by default... so when I want to go to root I want to su...

I've also installed a ubuntu chroot using a dedicated app and there su works... Which suggests it is specific to gentoo install...

The more I read the sticky threads the more I don't understand as everything seems correctly set up
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dwardo
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PostPosted: Sun Mar 17, 2013 8:19 pm    Post subject: Reply with quote

Solved...

Well I re-read the stickies and sure enough the answer was in them....
I had missed the "NO nosuid option" for the partition on which su is... :-(

Once that was corrected, all is good !
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