Raspberry Pi Forums

Posted: **Fri Feb 24, 2017 7:47 pm**

hello i seem to have new problems. i was trying to get the permissions for the pi account to open certain commands (which for some reason it didnt even allow when i ran the command while i did sudo su before?) and now i have sudo problems. i managed to fix sudo through pkexec. but guess what.

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pkexec must be setuid root

when running pkexec as normal pi acc.
the same result when running 'gparted-pkexec'. is there any way to fix this problem?
(like reinstalling pkexec and the programs with pkexec?or reinstalling anything with sudo like gksu, sudo itselfs, sudoers(if there is) gksudo and pkexec?)

thanks in advance.

Posted: **Sat Feb 25, 2017 12:33 am**

That doesn't sound too good... If you're able to login as root on the machine, then here are the owner/permissions for pkexec and a list of executables that should as well belong to root and be set suid, as found on my Raspbian Lite machine:

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admin@berck:~ $ which /usr/bin/pkexec 
/usr/bin/pkexec
admin@berck:~ $ stat -c "%a %u %g %n" /usr/bin/pkexec 
4755 0 0 /usr/bin/pkexec
admin@berck:~ $ find /usr/bin -user 0 -perm 4755
/usr/bin/pkexec
/usr/bin/passwd
/usr/bin/chsh
/usr/bin/newgidmap
/usr/bin/gpasswd
/usr/bin/newgrp
/usr/bin/newuidmap
/usr/bin/ksu
/usr/bin/chfn
/usr/bin/sudo

HTH

Posted: **Sat Mar 04, 2017 2:25 pm**

epoch1970 wrote:That doesn't sound too good... If you're able to login as root on the machine, then here are the owner/permissions for pkexec and a list of executables that should as well belong to root and be set suid, as found on my Raspbian Lite machine:
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admin@berck:~ $ which /usr/bin/pkexec 
/usr/bin/pkexec
admin@berck:~ $ stat -c "%a %u %g %n" /usr/bin/pkexec 
4755 0 0 /usr/bin/pkexec
admin@berck:~ $ find /usr/bin -user 0 -perm 4755
/usr/bin/pkexec
/usr/bin/passwd
/usr/bin/chsh
/usr/bin/newgidmap
/usr/bin/gpasswd
/usr/bin/newgrp
/usr/bin/newuidmap
/usr/bin/ksu
/usr/bin/chfn
/usr/bin/sudo
HTH

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root@RaspPi:/home/pi# stat -c "%a %u %n" /usr/bin/pkexec
755 0 /usr/bin/pkexec

is there a way to set perms to 4755 like normal?

Posted: **Sat Mar 04, 2017 2:33 pm**

sudo chmod +s /usr/bin/pkexec

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