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Date: Sat, 20 Jan 2007 15:18:14 -0600
From: Troy Bollinger <>
To: eugeny gladkih <>
Cc: Shiva Persaud <>,,
Subject: Re: [Full-disclosure] Multiple OS kernel insecure handling of stdio file descriptor

On Sat, Jan 20, 2007 at 08:43:33PM +0300, eugeny gladkih wrote:
> well, but what is used for stdout if it's closed in the parent
> process just before fork(2) call?!

If I recall correctly, setuid and setgid programs with closed stdin,
stdout or stderr will open /dev/null during exec.

This fix was added to AIX back in 1999 or so.

Troy Bollinger <>
Network Security Analyst
PGP keyid: 1024/0xB7783129
Troy's opinions are not IBM policy

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