ODA - Online Disassembler (opens in new tab)

(onlinedisassembler.com)

50 pointsjazzdan13y ago21 comments

21 comments

For those who don't have showdead enabled...

SparrowOS 2 hours ago | link [dead] | -26%

I made a disassembler It's mostly just a binary search through the opcodes. The trick is ordering them. http://www.sparrowos.com/Wb/Compiler/Unassembler.html Yes, I typed all this shit by hand. It's not complete. http://www.sparrowos.com/Wb/Compiler/OpCodes.html

I haven't really gotten to grips with SparrowOS yet as I don't program enough to fully understand/appreciate it, but this makes it that bit more desirable as a hacking tool. Thank you.

tptacek13y ago

He wrote a disassembler as a hand-hacked state machine. A crazy amount of focus.

"-26%"?

anigbrowl13y ago

FeelHN does sntiment analysis for HN posts - I find it a useful indicator that it might be time to step away from a particular discussion or take a break from HN.

https://chrome.google.com/webstore/detail/feelhn/hpnealkfodh...

unwind13y ago

Fantastic feature to show branches graphically in the margin as arrows.

Blindingly obvious, but still saves a lot of mental effort in keeping addresses in your head.

Haven't seen any "desktop disassembler" (that sounds furniture-related) do that.

borski13y ago

IDA Pro shows branches/jumps as a graph, which I think is even better: http://www.hex-rays.com/products/ida/pix/5_plain_graph_view....

When not in graph mode, it'll show jump arrows in the margin: http://www.chip.de/ii/146940129_e98df3e41d.jpg

wladimir13y ago

IDA Pro is crazily expensive though, and probably not worth it unless you're doing reverse engineering / exploit finding for a living. For example it's a bit overkill for just looking at disassembly to see what code the compiler has written, which (I think) is the common use case of objdump.

3 more replies

gsg13y ago

Agreed. I have a flaky emacs hack that colours labels to make it easier to correspond branch with target, but arrows are considerably nicer.

chetanahuja13y ago

@gsg Would you mind sharing said emacs hack ;-)

1 more reply

tptacek13y ago

Looks like it's objdump built for all-architectures.

gsg13y ago

Certainly has some of objdump's quirks. 8d bc 27 00 00 00 00 => lea 0x0(%edi,%eiz,1),%edi.

I was half expecting a disassembler written in Javascript.

kanzure13y ago

It would be great to be able to paste a url to others of a work-in-progress pastebin-style dump of something I'm commenting or reversing. Also, symfiles.

adotout13y ago

This is actually a feature we're currently working on. Thanks for reinforcing the need.

iseyler13y ago

The site barfs when I upload the BareMetal OS kernel for disassembly. Is there a size limit? The kernel is x86-64 and only 16KiB in size.

adotout13y ago

No, it's just an immature website. I'm one of the creators. The site is just a hobby now among friends, and since we all have families, it's slow going. Thanks for the feedback everyone!

j / k navigate · click thread line to collapse

21 comments

anigbrowl13y ago

For those who don't have showdead enabled...

SparrowOS 2 hours ago | link [dead] | -26%

I haven't really gotten to grips with SparrowOS yet as I don't program enough to fully understand/appreciate it, but this makes it that bit more desirable as a hacking tool. Thank you.

tptacek13y ago

He wrote a disassembler as a hand-hacked state machine. A crazy amount of focus.

"-26%"?

anigbrowl13y ago

FeelHN does sntiment analysis for HN posts - I find it a useful indicator that it might be time to step away from a particular discussion or take a break from HN.

https://chrome.google.com/webstore/detail/feelhn/hpnealkfodh...

unwind13y ago

Fantastic feature to show branches graphically in the margin as arrows.

Blindingly obvious, but still saves a lot of mental effort in keeping addresses in your head.

Haven't seen any "desktop disassembler" (that sounds furniture-related) do that.

borski13y ago

IDA Pro shows branches/jumps as a graph, which I think is even better: http://www.hex-rays.com/products/ida/pix/5_plain_graph_view....

When not in graph mode, it'll show jump arrows in the margin: http://www.chip.de/ii/146940129_e98df3e41d.jpg

wladimir13y ago

3 more replies

gsg13y ago

Agreed. I have a flaky emacs hack that colours labels to make it easier to correspond branch with target, but arrows are considerably nicer.

chetanahuja13y ago

@gsg Would you mind sharing said emacs hack ;-)

1 more reply

tptacek13y ago

Looks like it's objdump built for all-architectures.

gsg13y ago

Certainly has some of objdump's quirks. 8d bc 27 00 00 00 00 => lea 0x0(%edi,%eiz,1),%edi.

I was half expecting a disassembler written in Javascript.

kanzure13y ago

It would be great to be able to paste a url to others of a work-in-progress pastebin-style dump of something I'm commenting or reversing. Also, symfiles.

adotout13y ago

This is actually a feature we're currently working on. Thanks for reinforcing the need.

iseyler13y ago

The site barfs when I upload the BareMetal OS kernel for disassembly. Is there a size limit? The kernel is x86-64 and only 16KiB in size.

adotout13y ago

No, it's just an immature website. I'm one of the creators. The site is just a hobby now among friends, and since we all have families, it's slow going. Thanks for the feedback everyone!

j / k navigate · click thread line to collapse