Re: [Snort-devel] Re: SIGHUP doesn't work

From: Jeff Nathan <jeff(at)snort.org>
Date: Tue Sep 23 2003 - 02:22:37 EDT

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On Tuesday, September 23, 2003, at 01:43 AM, Denny Page wrote:

>>> BTW, can you not do a setreuid() back to root since the saved uid

The wrapper function SetUidGid() (in util.c) calls setuid(). A call to setuid() made by root sets the saved user ID to the euid. Thus, if we added code to call setreuid(), it would use the saved user ID which was equivalent to the euid when setuid() was called which would serve no purpose.

Conceptually, I see what you're getting at, but as explained on page 217 of APUE (Advanced Programming in the Unix Environment), it doesn't work. As I understand it, calling setreuid() is useful for the exec family of functions on setuid binaries but not when setuid() is called.

• -Jeff
• -- http://cerberus.sourcefire.com/~jeff (gpg/pgp key id 6923D3FD) "Problems cannot be solved at the same level of awareness that created them." - Albert Einstein

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