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Cannot run `ip` command without `sudo` as root
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copapa
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Joined: 14 Nov 2014
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PostPosted: Fri Jul 31, 2015 9:39 am    Post subject: Cannot run `ip` command without `sudo` as root Reply with quote

Hi.

I am having a problem with the ip command. I can run it normally as a simple user but cannot run it (i.e. no output appears, not even usage, but return code is 0) as root except if I use sudo (return code is 0 despite lack of output).
Selinux permissive or enforcing mode does not change this behavior.

Here is dump of a session : http://pastebin.com/index/VfVkFC7t .

Any clue ?
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copapa
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PostPosted: Fri Jul 31, 2015 9:45 am    Post subject: Reply with quote

Ok just after posting I had the idea to check if `ip` and `sudo ip` ran the same binary. And there I find

Code:
hostname ~ # which ip
/sbin/ip
hostname ~ # sudo which ip
/bin/ip
hostname ~ # ls -l /bin/ip
-rwxr-xr-x. 1 root root 318432 Jan 14  2015 /bin/ip
hostname ~ # ls -l /sbin/ip
-rwxr-xr-x. 1 root root 0 Apr  1 11:35 /sbin/ip


Ok something is really weird. I have a 0 byte `/sbin/ip`. And I wondered why my script didn't work :(
Anyone has an idea of the origin of this file ?
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charles17
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PostPosted: Fri Jul 31, 2015 12:03 pm    Post subject: Reply with quote

copapa wrote:
Anyone has an idea of the origin of this file ?

$ equery b /sbin/ip
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copapa
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PostPosted: Fri Jul 31, 2015 12:51 pm    Post subject: Reply with quote

Found the culprit !

My colleague created this file long time ago to silence an error message from FirewallBuilder (this program uses /sbin/ip as the default path for the ip command) but the ip command was just used to do some non-essentials checks in the script.

Sorry for the noise.
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