Show HN: Online C/C++ to assembly visualizer [Weekend Project] • Hacker News Board

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#21

Post by unix-dude » Sun, Sep 23, 2012, 12:26 PM UTC

Definitely interesting! Lots of us unix people would just run objdump -d for a quick ASM extraction, but this is probably much friendlier to the user just starting to learn C/ASM.

Overall, Good Job!

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#22

Post by espes » Sun, Sep 23, 2012, 12:26 PM UTC

ynh wrote: post #16

yonilevy wrote: post #12

Earlier quoted context omitted.

#define x "/etc/passwd" #include x

I have now fixed it. But I think there must be an other way to make it safe. Maybe a sandbox

If it's a server used for other things, definitely a sandbox. gcc's not exactly security hardend. Best one (novel solution, though the code's old and shit) I've come across: https://pts-mini-gpl.googlecode.com/svn/trunk/uevalrun/doc/u...

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#23

Post by dzorz » Sun, Sep 23, 2012, 12:37 PM UTC

ynh wrote: post #16

yonilevy wrote: post #12

Earlier quoted context omitted.

#define x "/etc/passwd" #include x

I have now fixed it. But I think there must be an other way to make it safe. Maybe a sandbox

This is part of your /etc/shadow file:

    root:censored

We can still read /etc/ssh/ssh_host_rsa_key, etc.

Edit: removed hash, sorry

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#24

Post by icefox » Sun, Sep 23, 2012, 12:40 PM UTC

alpb wrote: post #4

Try this on iPad. Generated assembly looks very bad in terms of layout.

And you can't load any of the examples

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#25

Post by daeken » Sun, Sep 23, 2012, 12:46 PM UTC

dzorz wrote: post #23

ynh wrote: post #16

Earlier quoted context omitted.

I have now fixed it. But I think there must be an other way to make it safe. Maybe a sandbox

This is part of your /etc/shadow file: root:censored We can still read /etc/ssh/ssh_host_rsa_key, etc. Edit: removed hash, sorry

Saying "you can read /etc/shadow by doing X, Y, and Z" is okay -- it's a permanent record there was a flaw. Saying "here's your root password hash" is not ok; even once the flaw is fixed, that hash is still floating around out there. I'd take advantage of the edit period and remove that from your comment; it's just not cool. The OP should definitely change the root password on the box regardless.

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#26

Post by ajhai » Sun, Sep 23, 2012, 12:56 PM UTC

Interesting project. As an improvement to the UI, you can consider adding syntax highlighting to the editor. Take a look at ACE editor (http://ace.ajax.org/).

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#27

Post by ynh » Sun, Sep 23, 2012, 12:56 PM UTC

ynh wrote: post #16

yonilevy wrote: post #12

Earlier quoted context omitted.

#define x "/etc/passwd" #include x

I have now fixed it. But I think there must be an other way to make it safe. Maybe a sandbox

I have now used a the wrapper by gcc-explorer https://github.com/mattgodbolt/gcc-explorer/blob/master/c-pr...

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#28

Post by daurnimator » Sun, Sep 23, 2012, 12:57 PM UTC

Error: Command failed: /bin/sh: 1: c-preload/compiler-wrapper: Permission denied

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#29

Post by ynh » Sun, Sep 23, 2012, 12:58 PM UTC

dzorz wrote: post #23

ynh wrote: post #16

Earlier quoted context omitted.

I have now fixed it. But I think there must be an other way to make it safe. Maybe a sandbox

This is part of your /etc/shadow file: root:censored We can still read /etc/ssh/ssh_host_rsa_key, etc. Edit: removed hash, sorry

No problem I think I could fix it.

Can you show us how you read the content of the file. Just want to learn more

Re: Show HN: Online C/C++ to assembly visualizer [Weekend Project]

#30

Post by gtklocker » Sun, Sep 23, 2012, 1:04 PM UTC

Error: Command failed: /tmp/test969394043.c:1:0: fatal error: can’t open /root/assembler/ccMEBJ3B.s for writing: Permission denied compilation terminated. The bug is not reproducible, so it is likely a hardware or OS problem.

Really.