[kernel-hardening] Re: [PATCH v3 1/4] x86/mm: Adapt MODULES_END based on Fixmap section size

Borislav Petkov
2017-02-15T21:08:58Z

On Wed, Feb 15, 2017 at 04:49:21PM +0100, Borislav Petkov wrote:
> On Wed, Feb 15, 2017 at 07:40:51AM -0800, Thomas Garnier wrote:
> > Why do you think they rely on it being static? The VSYSCALL address is
> > not changed for example.
>
> I don't know, that's why I'm asking first. Userspace is known to pick
> different aspects of the kernel and deciding to use them for whatever.
> And once it relies on that, there's no changing it.

Ok, so we should be fine here because those addresses are internal to
the kernel, I'm being told, so anything using them will break and gets
to keep the pieces even.

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Boris.

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