This is a note to let you know that I've just added the patch titled
x86/setup: Fix low identity map for >= 2GB kernel range
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-setup-fix-low-identity-map-for-2gb-kernel-range.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 68accac392d859d24adcf1be3a90e41f978bd54c Mon Sep 17 00:00:00 2001
From: Krzysztof Mazur <krzys...@podlesie.net>
Date: Fri, 6 Nov 2015 14:18:36 +0100
Subject: x86/setup: Fix low identity map for >= 2GB kernel range
From: Krzysztof Mazur <krzys...@podlesie.net>
commit 68accac392d859d24adcf1be3a90e41f978bd54c upstream.
The commit f5f3497cad8c extended the low identity mapping. However, if
the kernel uses more than 2 GB (VMSPLIT_2G_OPT or VMSPLIT_1G memory
split), the normal memory mapping is overwritten by the low identity
mapping causing a crash. To avoid overwritting, limit the low identity
map to cover only memory before kernel range (PAGE_OFFSET).
Fixes: f5f3497cad8c "x86/setup: Extend low identity map to cover whole kernel
range
Signed-off-by: Krzysztof Mazur <krzys...@podlesie.net>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Borislav Petkov <b...@alien8.de>
Cc: Laszlo Ersek <ler...@redhat.com>
Cc: Matt Fleming <matt.flem...@intel.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Link:
http://lkml.kernel.org/r/1446815916-22105-1-git-send-email-krzys...@podlesie.net
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/kernel/setup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1205,7 +1205,7 @@ void __init setup_arch(char **cmdline_p)
*/
clone_pgd_range(initial_page_table,
swapper_pg_dir + KERNEL_PGD_BOUNDARY,
- KERNEL_PGD_PTRS);
+ min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
#endif
tboot_probe();
Patches currently in stable-queue which might be from krzys...@podlesie.net are
queue-4.2/x86-setup-fix-low-identity-map-for-2gb-kernel-range.patch
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