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Re: 1.3.22: child real uid gets parent's effective uid
- From: Corinna Vinschen <corinna-cygwin at cygwin dot com>
- To: "'cygwin at cygwin dot com'" <cygwin at cygwin dot com>
- Date: Sat, 7 Jun 2003 11:52:08 +0200
- Subject: Re: 1.3.22: child real uid gets parent's effective uid
- References: <4C37CF2D8DF07E4CA6357BAD5EB9A5D705B05A27@oh0012itsa1.cb.lucent.com>
- Reply-to: cygwin at cygwin dot com
On Fri, Jun 06, 2003 at 04:20:43PM -0400, Snively, John P (John) wrote:
> I changed the effective uid of my app's process using seteuid, and printed
> out the real and effective uid's obtained via getuid and geteuid. No
> surprises, until I tested running a child process via system() and printing
> ITS real and effective uid's. The effective AND real uid of the child are
> set to the effective uid of the parent -- ouch:
> before changing euid:
> child: euid: 25313 ruid: 25313
> parent: euid: 25313 ruid: 25313
> setting euid to 500
> child: euid: 500 ruid: 500
> parent: euid: 500 ruid: 25313
> Any way around this?
Not easily. The difference between real and effective uid is just plain
fake. Windows doesn't support that difference, there's just one uid
(better: owner SID) attached to a process. So each new process begins
its life with euid == ruid.
Corinna Vinschen Please, send mails regarding Cygwin to
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