Patch for OpenSSH/mmap() on Linux 2.2

[Michael Bacarella]

A colleague was having trouble running OpenSSH 3.3p on his server.

He, like many of us, has been clobbered by the mighty security penis
of Theo De Raadt into enabling "privsep".

But on some Linux 2.2 kernels, this is broken. Apparantly, OpenSSH "portable"
relies on non-POSIX compliant mmap() features.

Making the mmap() call in monitor_mm.c look something like this:

        {
        char template[40], c = 0;
        int fd;

        sprintf(template,"/tmp/sshd-XXXXXX");
        fd = mkstemp(template);
        unlink(template);

        lseek(fd,(size/4096*4096*2)-1,SEEK_SET);
        write(fd,&c,1);

        address = mmap(NULL,size,PROT_WRITE|PROT_READ,MAP_SHARED,fd,0);
        memset(address,0,size);
        close(fd);
        }

fixes it on his server. If you use this, it is, like everything else in
life, at your own risk.

I don't follow the list so I have no idea if this has been reported, fixed,
or otherwise dealt with.  If you're going to respond to yell at me, do it off list.

-- 
Michael Bacarella  | Netgraft Corporation
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