From: Andy Lutomirski <luto@amacapital.net>
Date: Fri, 5 Dec 2014 00:48:16 +0000 (-0800)
Subject: x86/tls: Validate TLS entries to protect espfix
X-Git-Tag: v3.2.66~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=106ed96d46fcaf9f2e72555035fa585403cf4dd3;p=pandora-kernel.git

x86/tls: Validate TLS entries to protect espfix

commit 41bdc78544b8a93a9c6814b8bbbfef966272abbe upstream.

Installing a 16-bit RW data segment into the GDT defeats espfix.
AFAICT this will not affect glibc, Wine, or dosemu at all.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: security@kernel.org <security@kernel.org>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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