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Try it the other way round (first effective, then real):

$> = $uid; $< = $uid; ...
$ sudo strace ./switchback.pl 2>&1 | grep '^setr' setresuid(-1, 65534, -1) = 0 setreuid(65534, 4294967295) = 0 setresuid(-1, 0, -1) = -1 EPERM (Operation not perm +itted) setreuid(0, 4294967295) = -1 EPERM (Operation not perm +itted)

In reply to Re: $< and setuid: quite different animals? by almut
in thread $< and setuid: quite different animals? by saintmike

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