Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Re^2: EUID cannot be set

by 0xbeef (Hermit)
on May 09, 2007 at 21:34 UTC ( [id://614501]=note: print w/replies, xml ) Need Help??


in reply to Re: EUID cannot be set
in thread EUID cannot be set

Mmm, I did in fact check that:

linux: demotion to sys(4294967294) failed: Bad file descriptor (euid: 
+-2)
aix: demotion to nobody(4294967294) failed:  (euid: -2)

[download]

Niel

Replies are listed 'Best First'.
Re^3: EUID cannot be set
by mr_mischief (Monsignor) on May 10, 2007 at 20:19 UTC
    Note on AIX's nobody user for Exim
    Services for Unix blog

    It seems this is not overflow. It's just a representation in one place using an unsigned value and in another using a signed value.

    Considering there are 4,294,967,296 values in a 32-bit integer and that the signed number would be in two's complement if negative, -2 is exactly the same as 4294967294.

    As a matter of fact, I believe your EUID is being set. It's just not being set to the right interpretation of the number. I suggest you ponder this code: 

    #!/usr/bin/perl --
use strict;
use warnings;

my $nobody = 4294967294;
print $nobody . "\n";

$nobody = pack 'I', -2;
$nobody = unpack 'I', $nobody;
print $nobody . "\n";

    [download]


    Christopher E. Stith
[reply]
[d/l]

In Section Seekers of Perl Wisdom

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?

www.com | www.net | www.org
Node Status?
node history
Node Type: note [id://614501]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? • Last hour • Other CB clients
Other Users?
Others cooling their heels in the Monastery: (2)
As of 2024-04-24 15:40 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found