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authorAndrey Ryabinin <ryabinin.a.a@gmail.com>2015-08-13 08:37:24 +0300
committerIngo Molnar <mingo@kernel.org>2015-08-22 14:54:55 +0200
commit69786cdb379bbc6eab14cf2393c1abd879316e85 (patch)
treeddfaf2f85b64057553a745c9080c2e6714880613 /include/linux/kasan.h
parent920e277e17f12870188f4564887a95ae9ac03e31 (diff)
downloadlinux-69786cdb379bbc6eab14cf2393c1abd879316e85.tar.gz
x86/kasan, mm: Introduce generic kasan_populate_zero_shadow()
Introduce generic kasan_populate_zero_shadow(shadow_start, shadow_end). This function maps kasan_zero_page to the [shadow_start, shadow_end] addresses. This replaces x86_64 specific populate_zero_shadow() and will be used for ARM64 in follow on patches. The main changes from original version are: * Use p?d_populate*() instead of set_p?d() * Use memblock allocator directly instead of vmemmap_alloc_block() * __pa() instead of __pa_nodebug(). __pa() causes troubles iff we use it before kasan_early_init(). kasan_populate_zero_shadow() will be used later, so we ok with __pa() here. Signed-off-by: Andrey Ryabinin <ryabinin.a.a@gmail.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Alexander Potapenko <glider@google.com> Cc: Alexey Klimov <klimov.linux@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David Keitel <dkeitel@codeaurora.org> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: Yury <yury.norov@gmail.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/1439444244-26057-3-git-send-email-ryabinin.a.a@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/kasan.h')
-rw-r--r--include/linux/kasan.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 6fb1c7d4292c..4b9f85c963d0 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -12,8 +12,17 @@ struct vm_struct;
#define KASAN_SHADOW_SCALE_SHIFT 3
#include <asm/kasan.h>
+#include <asm/pgtable.h>
#include <linux/sched.h>
+extern unsigned char kasan_zero_page[PAGE_SIZE];
+extern pte_t kasan_zero_pte[PTRS_PER_PTE];
+extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
+extern pud_t kasan_zero_pud[PTRS_PER_PUD];
+
+void kasan_populate_zero_shadow(const void *shadow_start,
+ const void *shadow_end);
+
static inline void *kasan_mem_to_shadow(const void *addr)
{
return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)