x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap

x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap

commit dac16fba6fc590fa7239676b35ed75dae4c4cd2b upstream.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/9d37826fdc7e2d2809efe31d5345f97186859284.1449702533.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Jamie Iles <jamie.iles@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 755bd549d9328d6d1e949a0a213f9a78e84d11fc)
Orabug: 27333760
CVE: CVE-2017-5754
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Conflicts:
	arch/x86/entry/vdso/vclock_gettime.c (not in this tree)
	arch/x86/vdso/vclock_gettime.c (patched instead of that)
	arch/x86/entry/vdso/vdso2c.c (not in this tree)
	arch/x86/vdso/vdso2c.c (patched instead of that)
	arch/x86/entry/vdso/vma.c (not in this tree)
	arch/x86/vdso/vma.c (patched instead of that)

Signed-off-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>