Messages in this thread | | | Date | Fri, 27 Feb 2009 13:19:36 -0800 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH RFC] x86: add brk allocation for very, very early allocations |
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H. Peter Anvin wrote: > That would make sense. init_memory_mapping() needs to know what not to > step on, and that would include the brk at this stage. For 64-bit mode, > Xen is the only user of !PSE, and so may be particularly vulnerable to > this issue (because of massively larger direct mapping tables.) >
Yep.
> This reminds me... is your intent that the BRK is permanent (unless > explicitly freed on a page by page basis) or part of the init memory > that is flushed? >
Permanent. I'm using it to allocate things which are the moral equivalent of the kernel pagetables.
J
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