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Re: setuid and setgid leaves user in 0 (wheel) group

by bingos (Vicar)
on Dec 17, 2010 at 12:21 UTC ( #877631=note: print w/replies, xml ) Need Help??

in reply to setuid and setgid leaves user in 0 (wheel) group

According to perlvar for $):

The first number sets the effective gid, and the rest (if any) are passed to setgroups(). To get the effect of an empty list for setgroups(), just repeat the new effective gid


$) = "$gid $gid";

The following code on my machine (NetBSD):

use strict; use warnings; use POSIX; my( $uid, $gid ) = qw/32767 32766/; setgid( $gid ); $) = "$gid $gid"; $( = $gid; die "Set group ($gid): $! +" if ( $( != $gid ) or ( $) != $gid ); setuid( $uid ); $> = $uid; $< = $uid; die "Set user ($uid): $!" if ( $< != $uid ) or ( $> != $uid ); print `id`;


uid=32767(nobody) gid=32766(nogroup) groups=32766(nogroup)

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Re^2: setuid and setgid leaves user in 0 (wheel) group
by petr999 (Acolyte) on Dec 17, 2010 at 13:26 UTC
    $) = "$gid $gid"
    Cool, it works, thanks!

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[Corion]: So Hyperboria is an envrypted, decentralized IPv6 mesh network. I'm interested and want to look how good coverage is in my area. But the API for querying Hyperboria is only reachable over Hyperboria itself. Thanks but no thanks.

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