Option to clear allocated kernel memory before freeing it?

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Hello,

Would it make sense to implement a kernel option that would clear kernel memory before freeing it (by kfree or free_page(s))?

Unless I'm missing something, uncleared memory previously used for kernel allocations could later be recycled for user allocations, making it possible for a user program to access sensitive driver data if it's lucky.

Tough clearing memory should be efficient (thanks to the use of memset(), optimized for each platform), there would of course be a significant performance hit. However, this could be acceptable for systems with strong security requirements...

What do you think? If this idea makes sense, I'll be glad to help in implementing it.

   Thanks in advance,

   Cheers,

   Michael.

--
Michael Opdenacker, Free Electrons
Free Embedded Linux Training Materials
on http://free-electrons.com/training
(More than 1000 pages!)

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