jevinskie

14 ms·

91.
by jevinskie 10y ago
This sort of visualization would be nice for LLVM IR! The Go implementation is located here: https://github.com/golang/go/blob/master/src/cmd/compile/int...
92.
by jevinskie 10y ago
Oh cool, now I know where James Bond was in Octopussy!
93.
by jevinskie 10y ago
I wish pahole got more attention since I had some great experiences with it years ago. I tried it recently and it didn't like the DWARF info that my compiler was spitting out. Perhaps I need to tweak the DWARF versioning or, gulp , tr
94.
by jevinskie 10y ago
Very nice, I didn't know there was a dedicated site for "I need just HTTP" purposes. Thanks for the tidbit!
95.
by jevinskie 10y ago
Would you be willing to further explain your mental health concerns? Was it a worry of burnout, undesirable hyper-focus on bug finding, or something else?
96.
by jevinskie 10y ago
Huh? Veertu Premium is a $40 IAP. https://itunes.apple.com/app/veertu/id1024069033
97.
by jevinskie 10y ago
"or forcing itself upon me" Apple's current strategy for security fixes is "update or die". They now support only the latest and greatest OS on both desktop and mobile, with no "enterprise" exceptions. I
98.
by jevinskie 10y ago
nvc (LLVM based) is also impressively complete for the number of people who have worked on it. https://github.com/nickg/nvc
99.
by jevinskie 10y ago
You can do it with a single gate and a handful of passive parts. http://ieee-security.org/TC/SP2016/papers/0824a018.pdf
100.
A Proposal for a High Resolution Display (2009)(bernd-paysan.de)
60 points by jevinskie 10y ago|36 comments
101.
by jevinskie 10y ago
I did some more digging and it looks like I should read the RAFTS paper. [0] [0]: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.5.38...
102.
by jevinskie 10y ago
Does anyone have links to resources that speak to converting a stack machine (Forth, in my case) into SSA form (LLVM, in my case)? My first approach was to just subroutine thread everything and see how well the inliner and optimizer handles
103.
by jevinskie 10y ago
It is news to me. I thought iOS simply didn't implement that functionality without being enrolled in MDM. With Android I knew about it and was able to build a custom firmware with that functionality disabled. I wonder if you can make a
104.
by jevinskie 10y ago
I've always felt that part of Car Talk's popularity was their eagerness (and perhaps determined effort, I'm not sure of the demographics) to include female callers in their shows, as equals to males. Honestly, their inclusion
105.
by jevinskie 10y ago
That gets you a kernel dump, a decrypted kernelcache gives you very handy MachO headers. And as Will said, the well known kernel dumping methods do not dump Watchtower. I'm not sure if anyone has privately been able to dump Watchtower
106.
by jevinskie 10y ago
I'm very nearly certain because I benchmarked decrypting the iOS 10 beta kernel using the code at [0]. The kernelcache is about 13 MB compressed and takes about 60 milliseconds to decrypt. Previous iOS versions encrypted the compressed
107.
by jevinskie 10y ago
I was curious so I benchmarked "decrypting" kernelcache.release.n66 on an iPhone 6S and it took about 60 milliseconds to decrypt. It wasn't encrypted in the first place so the decryption results in garbage, but it should be a
108.
by jevinskie 10y ago
That is, unfortunately, by no means "all the source code" of the kernel-level code that is running on your Mac, iPhone, iPad, iPod, Apple TV, or Apple Watch.
109.
by jevinskie 10y ago
I forgot to mention launchd. It was open source then was closed and split into launchd/libxpc. It has always been a critical security component of macOS/iOS. Many CVEs have been written about it even after it was closed via binary
110.
by jevinskie 10y ago
I believe the grandparent post is referring to the fact that HFS+ is available in the open source release of xnu [1] while the question of whether Apple will open source APFS kext, especially given their recent trend of moving functionality
111.
by jevinskie 10y ago
Thank you for the slide deck! I arrived about halfway into the talk and hadn't seen the published slide deck until you pointed it out to me.
112.
by jevinskie 10y ago
It is concerning to me that WP seems to be dead in the water. I'd wadger that an essential duopoly in mobile platforms is harmful to most people. BB (had a phenomenal start and lost it) and WP (late to the party and then constantly con
113.
by jevinskie 10y ago
Permanent storage. The kernelcache is lzss compressed and encrypted with AES. I forget the details of signature verification at the moment, but that is done using RSA. The iBoot bootloader handles all of the decompression, decryption, and s
114.
by jevinskie 10y ago
Some of the kernel is released months/years later as open source. You are correct about the releases being macOS only, iOS xnu has never been open sourced but it is, for the most part, identical. Apple has also been moving code out of
115.
by jevinskie 10y ago
The spokesperson is talking out of their ass regarding performance. The kernel is decrypted by iBoot once at boot, using the hardware AES engine. It remains decrypted until the device is shutdown/rebooted. Decompressing and decryptin
116.
by jevinskie 10y ago
The speaker talked about an exploitable vulnerability in the bootrom, correct? Thus all ESP8266s are permanently vulnerable and only a new die rev could fix it. The CPU architecture is also interesting.
117.
by jevinskie 10y ago
It is even more interesting, today, when you see the statement that prompted Göring to respond as such. > "There is one difference," I pointed out. "In a democracy the people have some say in the matter through their elect
118.
by jevinskie 10y ago
1948 even: https://en.wikipedia.org/wiki/1948_Lake_Mead_Boeing_B-29_cra...
119.
by jevinskie 10y ago
I've heard that the hit ratio of modern small-arms battle is very low. The railgun would be a much more assured strike than sending even many humans to do the job. The railgun isn't just replacing rifles, bombs, and missiles, it i
120.
by jevinskie 10y ago
Consider that an infantry rifle will cost at least $1,000. A rail gun round seems like a bargain if it costs 25-50 rifles-worth! The risk to the military personnel is also lesser than using small arms rifles.

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