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SubjectRe: [PATCH RFC] x86: add brk allocation for very, very early allocations
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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