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Date: Thu, 11 Oct 2018 13:30:33 -0700
From: Dave Hansen <>
To: Solar Designer <>,
Subject: Re: Linux kernel: "Meltdown leaks with Global kernel

On 10/09/2018 04:41 AM, Solar Designer wrote:
> There are mentions of "r/w kernel text issue" and "unused hole" issue -
> is this why "two"?  But "r/w kernel text" feels irrelevant to Meltdown.

The description says:

> The current PTI code leaves the entire area of the kernel binary
> between '_text' and '_end' as Global (on non-PCID hardware).
> However, that range contains both read-write kernel data, and two
> "unused" holes in addition to text.

I said two issues because I saw two distinct problems:

1. 'read-write kernel data'
2. '"unused" holes'

Does that clear it up?

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