Re[2]: setuid funciton

["Cihan Kömeçoğlu" <cihan@enderunix.org>]

I understand. Thanks for your answer
I try this code under Freebsd 6.2
and dont give me this output

Wednesday, December 26, 2007, 5:28:08 AM, you wrote:

> Cihan Kömeçoľlu wrote:

>> Hello everybody
>> 
>> I have written simple code about usage of setuid. this program file
>> set-user-id bit is on and this process after exec when I execute this
>> program, effective user id and saved-user-id bit will be
>> program-file's user id. this correct?
>> 
>> But the last output when I set uid to 80(www) ,effective user id
>> wasn't 80. Why not? saved set user id is still 80? What is the
>> problem?
>> 
>> 
>> I compiled below code with gcc and I set-user-id bit and change own
>> file with this command

> [snip]

> It works for me; I get:

> Real UID        = 1001
> Effective UID   = 80
> Real UID        = 1001
> Effective UID   = 1001
> Real UID        = 1001
> Effective UID   = 80

> This is with a 2.6.17.13 kernel, compiled from stock sources (no
> vendor patches).

> If you are using a kernel with additional security features (e.g. 
> SELinux, AppArmor etc), it may impose additional restrictions on
> setuid(). You could try using setreuid() to swap the real and
> effective UIDs, rather than relying upon the saved UID.




-- 
Cihan Kömeçoðlu,
EnderUNIX SDT                           mailto:cihan@enderunix.org

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