strange error building print/texinfo
Eugene Grosbein
eugen at grosbein.net
Sat Oct 17 09:57:27 UTC 2015
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.
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