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C's notion of null _is_ the _only_ relevantC's notion of null _is_ the _only_ relevantPosted Jul 19, 2009 11:19 UTC (Sun) by nix (subscriber, #2304)In reply to: C's notion of null _is_ the _only_ relevant by xilun Parent article: Linux 2.6.30 exploit posted
The *attacker* mmap()ed address zero, not the kernel. I suppose there
should be an option to make NULL not all-bits-zero when inside the kernel, but then you'd have to adjust pointers in transit from userspace and comparisons to it would be slower and so on.
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