[Xen-devel] [PATCH 4.19 030/148] x86/dump_pagetables: Fix LDT remap address marker

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 254eb5505ca0ca749d3a491fc6668b6c16647a99 ]

The LDT remap placement has been changed. It's now placed before the direct
mapping in the kernel virtual address space for both paging modes.

Change address markers order accordingly.

Fixes: d52888aa2753 ("x86/mm: Move LDT remap out of KASLR region on 5-level 
paging")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: bp@xxxxxxxxx
Cc: hpa@xxxxxxxxx
Cc: dave.hansen@xxxxxxxxxxxxxxx
Cc: luto@xxxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: boris.ostrovsky@xxxxxxxxxx
Cc: jgross@xxxxxxxx
Cc: bhe@xxxxxxxxxx
Cc: hans.van.kranenburg@xxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Link: 
https://lkml.kernel.org/r/20181130202328.65359-3-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 arch/x86/mm/dump_pagetables.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 073755c89126..c05a818224bb 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -53,10 +53,10 @@ struct addr_marker {
 enum address_markers_idx {
        USER_SPACE_NR = 0,
        KERNEL_SPACE_NR,
-       LOW_KERNEL_NR,
-#if defined(CONFIG_MODIFY_LDT_SYSCALL) && defined(CONFIG_X86_5LEVEL)
+#ifdef CONFIG_MODIFY_LDT_SYSCALL
        LDT_NR,
 #endif
+       LOW_KERNEL_NR,
        VMALLOC_START_NR,
        VMEMMAP_START_NR,
 #ifdef CONFIG_KASAN
@@ -64,9 +64,6 @@ enum address_markers_idx {
        KASAN_SHADOW_END_NR,
 #endif
        CPU_ENTRY_AREA_NR,
-#if defined(CONFIG_MODIFY_LDT_SYSCALL) && !defined(CONFIG_X86_5LEVEL)
-       LDT_NR,
-#endif
 #ifdef CONFIG_X86_ESPFIX64
        ESPFIX_START_NR,
 #endif
-- 
2.19.1




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