From owner-freebsd-mips@freebsd.org  Sat Oct 17 09:57:27 2015
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Subject: Re: strange error building print/texinfo
To: Sean Bruno <sbruno@freebsd.org>, freebsd-mips@freebsd.org
References: <56212F5F.3020603@rdtc.ru> <56217396.1050509@freebsd.org>
From: Eugene Grosbein <eugen@grosbein.net>
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Date: Sat, 17 Oct 2015 16:57:00 +0700
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On 17.10.2015 05:00, Sean Bruno wrote:

> I just built print/texinfo with the lastes qemu-user-static without an
> issue:
> http://tasty.ysv.freebsd.org/build.html?mastername=11mips-default&build=
> 2015-10-16_18h26m15s

I've digged it: install(1) calls mmap() inside its copy() function:

        /*
         * Mmap and write if less than 8M (the limit is so we don't totally
         * trash memory on big files.  This is really a minor hack, but it
         * wins some CPU back.
         */
        done_copy = 0;
        if (size <= 8 * 1048576 && trymmap(from_fd) &&
            (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
                    from_fd, (off_t)0)) != MAP_FAILED) {
                nw = write(to_fd, p, size);


mmap() returns NULL in my case, not MAP_FAILD.
There is no check for NULL and write() returns EFAULT for attempt to write to NULL.