bugtraq - RE: SECURITY.NNOV: Multiple applications fd_set structure bitmap array index overflow

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Message-ID: <42F638FF29F12F46930CFF347AE69680016A9CC7@DF-SEADOG-MSG.exchange.corp.microsoft.com>
Date: Fri, 28 Jan 2005 19:33:39 -0800
From: "David LeBlanc" <dleblanc@...hange.microsoft.com>
To: "Damien Miller" <djm@...drot.org>
Cc: "3APA3A" <3APA3A@...urity.nnov.ru>, <bugtraq@...urityfocus.com>
Subject: RE: SECURITY.NNOV: Multiple applications fd_set structure bitmap array index overflow


 

-----Original Message-----
From: Damien Miller [mailto:djm@...drot.org] said:

>This effectively limits select to a maximum of FD_SETSIZE descriptors
on Windows. I don't think that this limitiation exists on other
platforms.

---------------------------

Note the bit where it says:

#ifndef FD_SETSIZE
#define FD_SETSIZE      64
#endif /* FD_SETSIZE */

So to make FD_SETSIZE any arbitrarily large value up to whatever your
system can handle, you just redefine FD_SETSIZE before you #include
winsock.h.