LinuxQuestions.org - Uncategorized

Concerning free software, programming, and whatever else I find interesting. Also the blog for my Web site, frigidcode.com.

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Security issues in opening an archive

Posted 01-17-2012 at 10:21 PM by hydraMax (Bits and Pixels)
Updated 01-17-2012 at 10:23 PM by hydraMax (typo)

I've personally opened hundreds (thousands?) of compressed archives -- tar, zip, and otherwise -- without even thinking of the possibility security ramifications of this action. However, extracting files (insecurely) from any archive has potentially two very dangerous effects:

1. overwriting a file that should not be overwritten
2. placing a file in a location you did not expect

These of course are most deadly in combination. The bsdtar manual page has a helpful...

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See source code intermixed with assembly

Posted 01-16-2012 at 03:25 AM by hydraMax (Bits and Pixels)

Tags c programming, debugging, gcc

Maybe everybody else already knows this, but I thought it was pretty neat anyway:

If you compile some C code with -g option (to include debugging symbols), you can then use objdump on the binary, with the -S switch, to get source code intermixed with assembly. For example, here is a snippet from one of my binaries:

Code:

int main() {
  401163:       55                      push   %rbp
  401164:       48 89 e5                mov    %rsp,%rbp
  401167:

...

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Planets

Posted 01-06-2012 at 07:56 PM by hydraMax (Bits and Pixels)

I uploaded some planet images I created using techniques from Gimp tutorials. (link, link). It is a lot of fun to create planets and I'd like to create a lot more in the future. I also updated my Xinequery code, adding a Gentoo ebuild, plus some functionality that should make it a little more useful.

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two uploads

Posted 12-23-2011 at 07:10 PM by hydraMax (Bits and Pixels)

Added a 3D apple rendering I made following a tutorial. (link) Also uploaded a small C program, useful for querying Xinerama. (link)

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Introductions

Posted 12-20-2011 at 08:41 PM by hydraMax (Bits and Pixels)

Hello. My user name at LQ is "hydraMax", but my real name is Christopher. If you wish to communicate with me, I have private messaging enabled. If you wish to communicate with me outside of LQ, send me a private message and we can exchange e-mail addresses.

I'm hoping to use this blog primarily to draw attention to the work I do and the projects with which I'm involved, usually available at my Web site, frigidcode.com. What do I do? Well, it is hard to summarize because...

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