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Message-ID: <3b969e4e-2c02-9b18-c1a2-412b5b698548@linux.intel.com>
Date: Thu, 11 Oct 2018 13:30:33 -0700
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: Solar Designer <solar@...nwall.com>, oss-security@...ts.openwall.com
Subject: Re: Linux kernel: "Meltdown leaks with Global kernel
mapping"
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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