The Weird and The Wonderful

The Weird and The Wonderful forum is a place to post Coding Horrors, Worst Practices, and the occasional flash of brilliance.

We all come across code that simply boggles the mind. Lazy kludges, embarrassing mistakes, horrid workarounds and developers just not quite getting it. And then somedays we come across - or write - the truly sublime.

Post your Best, your worst, and your most interesting. But please - no programming questions . This forum is purely for amusement and discussions on code snippets. All actual programming questions will be removed.

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Re: Code Safety and The .Net CLR & Java Runtime

LloydA1119-May-13 13:31

LloydA111

9-May-13 13:31

dusty_dex wrote:
The CLR/JAVA Runtime are the only executable code DEP has any direct control of

Nope not true at all. It has full control over native code too. Also, don't forget that these runtimes are written in native code.

Just as a point of interest, some CPU's have a hardware based DEP[^]

    .-.
   |o,o|
,| _\=/_      .-""-.
||/_/_\_\    /[] _ _\
|_/|(_)|\\  _|_o_LII|_
   \._./// / | ==== | \
   |\_/|"` |_| ==== |_|
   |_|_|    ||" ||  ||
   |-|-|    ||LI  o ||
   |_|_|    ||'----'||
  /_/ \_\  /__|    |__\

Re: Code Safety and The .Net CLR & Java Runtime

dusty_dex9-May-13 13:57

dusty_dex

9-May-13 13:57

Sorry, my wording could have been clearer. D'Oh! | :doh:

[I've made a minor modification to the original post]

I know that the DEP handles *all* native code, but that's what I was getting at. The runtimes are native code but I wanted to know whether the MSIL code/ Java Bytecode is kept in the dcache or icache along with native code.

I thought native code, unless specifically marked as shared would otherwise be read-only and not modifiable at runtime. Which led me to wonder about the location .NET/Java bytecodes and the whole self-modifying code (code injection) problem, with the apparent side-stepping of DEP protection.

Smile | :)