[New-bugs-announce] [issue11657] multiprocessing_{send, recv}fd fail with fds > 256

[Ben Darnell]

New submission from Ben Darnell <ben.darnell at gmail.com>:

Line 125 of multiprocessing.c is "*CMSG_DATA(cmsg) = fd;".  CMSG_DATA returns an unsigned char*, while fd is an int, so this code does not support file descriptors > 256 (additionally, I'm not sure if the buffer is guaranteed to be initialized with zeros).   recvfd has an analogous problem at line 168.  Both of these need to be changed to copy the entire integer, e.g. by casting the result of CMSG_DATA to an int*.

http://hg.python.org/cpython/file/5deb2094f033/Modules/_multiprocessing/multiprocessing.c

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messages: 131947
nosy: Ben.Darnell
priority: normal
severity: normal
status: open
title: multiprocessing_{send,recv}fd fail with fds > 256
type: behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11657>
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