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  T720 drawString() bug  (Read 1033 times)
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Offline Lavahead

Junior Newbie




Java games keep me employed!


« Posted 2003-07-16 23:18:37 »

Hey guys,
 I just submitted this bug to Motorola.  Anyone developing for the T720 should watch out for this as I lost a day trying to nail it down.  Note that this only works on the phone: no emulators reproduce it.
 The problem is that Graphics.drawString() isn't properly clipped.  Drawing a string near the bottom edge of an image appears to corrupt memory and will crash the KVM once you try to do anything important with it.

Sample code:
1  
2  
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Image img = Image.createImage(50, 4);
img.getGraphics().drawString("Howdy", 5, 7, Graphics.LEFT|Graphics.BASELINE);
Image.createImage(img);  //crash


If someone here is clever enough to use this bug to write to the memory space outside the KVM and hijack the phone, please post your results in this thread. :)
Offline Abuse

JGO Knight


Medals: 15


falling into the abyss of reality


« Reply #1 - Posted 2003-07-17 23:05:55 »

sweet!

Java mobile phone virus's. Cool

Make Elite IV:Dangerous happen! Pledge your backing at KICKSTARTER here! https://dl.dropbox.com/u/54785909/EliteIVsmaller.png
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