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Re: SECURITY.NNOV: Multiple applications fd_set structure bitmap array i

from [Damien Miller] Network Security [Permanent Link]
Subject: Re: SECURITY.NNOV: Multiple applications fd_set structure bitmap array index overflow
Date: Sat, 29 Jan 2005 10:17:00 +1100
David LeBlanc wrote:
if (__i == ((fd_set FAR *)(set))->fd_count) { \
if (((fd_set FAR *)(set))->fd_count < FD_SETSIZE) { \
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
((fd_set FAR *)(set))->fd_array[__i] = (fd); \
((fd_set FAR *)(set))->fd_count++; \
} \
} \
} while(0) 

So if you attempted to put FD_SETSIZE + 1 sockets into an fd_set, it
would just fail.


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

Correctly written programs dynamically allocate their FD_SETs to avoid
these problems (or they use poll or some other mechanism instead).

-d

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