> On May 11, 2016, at 7:55 AM, Bradford Wetmore <[email protected]> > wrote: > > What a stupid bug in MacOS. You can write to /dev/random, but not > /dev/urandom.
My understanding is that the entropy pool is on the /dev/random side, so you can write into it. On the /dev/urandom side, it seed from /dev/random and there is no meaning write into it, hence forbidden. --Max > > Yosemite: > $ uname -a > Darwin smarks 14.5.0 Darwin Kernel Version 14.5.0: Tue Sep 1 21:23:09 PDT > 2015; root:xnu-2782.50.1~1/RELEASE_X86_64 x86_64 > (4:51:18 PM) $ ls -al /dev/*random > crw-rw-rw- 1 root wheel 11, 0 May 10 16:50 /dev/random > crw-rw-rw- 1 root wheel 11, 1 May 10 16:39 /dev/urandom > > Change looks good. > > Brad > > > > On 5/10/2016 4:23 PM, Wang Weijun wrote: >> Hi All >> >> Please review the fix at >> >> http://cr.openjdk.java.net/~weijun/8156709/webrev.00/ >> >> On *nix, we open EGD and write into it when setSeed() is called. We were >> aware of the device not openable and have been ignoring it (Note we still >> write to a mix random). Now it seems on a Mac is can be opened for write but >> not writable. >> >> See this jshell output, the exception is thrown on write(). >> >> -> new FileOutputStream("/dev/urandom").write(12) >> | java.io.IOException thrown: Operation not permitted >> | at FileOutputStream.write (Native Method) >> | at FileOutputStream.write (FileOutputStream.java:291) >> | at (#17:1) >> >> Thanks >> Max >>
