[PATCH 1/1] x86_64: fix KASan shadow region page tables

[Alexander Popov]

Physical addresses in KASan shadow region page tables need fixup:
kernel halts without it if phys_base is not zero.

Signed-off-by: Alexander Popov <alpopov@xxxxxxxxxxxxxx>
---
 arch/x86/kernel/head_64.S | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index ae6588b..f7711bb 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -95,6 +95,20 @@ startup_64:
 
 	addq	%rbp, level2_fixmap_pgt + (506*8)(%rip)
 
+#ifdef CONFIG_KASAN
+	xor	%rax, %rax
+	leaq	kasan_zero_pud(%rip), %rbx
+	leaq	kasan_zero_pmd(%rip), %rcx
+	leaq	kasan_zero_pte(%rip), %rdx
+1:
+	addq	%rbp, (%rbx,%rax,8)
+	addq	%rbp, (%rcx,%rax,8)
+	addq	%rbp, (%rdx,%rax,8)
+	inc	%rax
+	cmp	$512, %rax
+	jne	1b
+#endif
+
 	/*
 	 * Set up the identity mapping for the switchover.  These
 	 * entries should *NOT* have the global bit set!  This also
-- 
1.9.1

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