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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
to someone familiar with internal working of strlib.asm:
Does the allocated blocks really have to be zeroed? (with HEAP_ZERO_MEMORY)
because if no, then it's just unnescesary slowdown
Post 27 Oct 2005, 00:24
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decard



Joined: 11 Sep 2003
Posts: 1092
Location: Poland
decard
No, it works well without it. But I don't think it slows down memory allocation a lot. It would be only 'rep stosd', right?
Post 27 Oct 2005, 04:03
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17639
Location: In your JS exploiting you and your system
revolution
Quote:
with HEAP_ZERO_MEMORY
Win2k and later ignore this parameter and always zero allocated memory.
Post 27 Oct 2005, 05:12
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
well, so i leave it out. Maybe it doesn't slow too much, but itdoes. we can easily clear memory ourselves when we need (and faster)

revolution: typical example of their unability to code. i believe they had bugs because of forgetting to clear memory, so they solved it this way. just like the one, when callback procedure returns to caller address always, regardless what is on the stak.
Post 27 Oct 2005, 08:17
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17639
Location: In your JS exploiting you and your system
revolution
Quote:
i believe they had bugs because of forgetting to clear memory
Actually it is for security to ensure that no information can leak from one process to another by using memory allocations.
Post 27 Oct 2005, 09:05
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
that can be it too... Wink
i believe that stack tricking is for security too Smile
Post 27 Oct 2005, 09:37
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17639
Location: In your JS exploiting you and your system
revolution
Quote:
stack tricking is for security too
What is "stack tricking"?
Post 27 Oct 2005, 23:48
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
that isn't it's real name.
if you mess stack in winXP callback procedure it returns to real address somehow anyway. i had ugly bug with that, i messed stack, but it still worked on some machines and crashed on others. and it was directx project so crash wasn't very nice, especially on older OSes.
Post 02 Nov 2005, 11:14
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