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x86/kasan: Fix KASAN shadow region page tables

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Currently KASAN shadow region page tables created without
respect of physical offset (phys_base). This causes kernel halt
when phys_base is not zero.

So let's initialize KASAN shadow region page tables in
kasan_early_init() using __pa_nodebug() which considers
phys_base.

This patch also separates x86_64_start_kernel() from KASAN low
level details by moving kasan_map_early_shadow(init_level4_pgt)
into kasan_early_init().

Remove the comment before clear_bss() which stopped bringing
much profit to the code readability. Otherwise describing all
the new order dependencies would be too verbose.

Signed-off-by: Alexander Popov <alpopov@ptsecurity.com>
Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: <stable@vger.kernel.org> # 4.0+
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1435828178-10975-3-git-send-email-a.ryabinin@samsung.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Alexander Popov
2015-07-02 12:09:34 +03:00
committed by Ingo Molnar
parent d0f77d4d04
commit 5d5aa3cfca
4 changed files with 38 additions and 42 deletions
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8
arch/x86/include/asm/kasan.h
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@@ -14,15 +14,11 @@
#ifndef __ASSEMBLY__
extern pte_t kasan_zero_pte[];
extern pte_t kasan_zero_pmd[];
extern pte_t kasan_zero_pud[];
#ifdef CONFIG_KASAN
void __init kasan_map_early_shadow(pgd_t *pgd);
void __init kasan_early_init(void);
void __init kasan_init(void);
#else
static inline void kasan_map_early_shadow(pgd_t *pgd) { }
static inline void kasan_early_init(void) { }
static inline void kasan_init(void) { }
#endif