Sanitizing kernel memory
Posted May 28, 2009 19:09 UTC (Thu) by anton
In reply to: Sanitizing kernel memory
Parent article: Sanitizing kernel memory
any userspace app that reads memory handed to it by the
kernel before writing it is broken.
If the application writes a byte to a line that's not in cache,
current CPUs load (the rest of) the cache line from main memory (write
allocate). In a few special cases this read can be avoided, but for
ordinary writes it happens.
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