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workaround another sendmsg kernel bug on 64-bit machines

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the kernel wrongly expects the cmsg length field to be size_t instead
of socklen_t. in order to work around the issue, we have to impose a
length limit and copy to a local buffer. the length limit should be
more than sufficient for any real-world use; these headers are only
used for passing file descriptors and permissions between processes
over unix sockets.
This commit is contained in:
Rich Felker 2012-07-12 21:37:54 -04:00
commit 96107564e2
6 changed files with 42 additions and 7 deletions
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7
include/sys/socket.h
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@ -17,13 +17,6 @@ extern "C" {
#include <bits/socket.h>
struct cmsghdr
{
socklen_t cmsg_len;
int cmsg_level;
int cmsg_type;
};
struct ucred
{
pid_t pid;