linux-kernel - [PATCH 18/31] kasan: reorder vmalloc hooks

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Message-Id: <01fdd2a34c212755b2c9f8b8d729712a7e3a227c.1638308023.git.andreyknvl@google.com>
Date:   Tue, 30 Nov 2021 23:07:00 +0100
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Peter Collingbourne <pcc@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Evgenii Stepanov <eugenis@...gle.com>,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 18/31] kasan: reorder vmalloc hooks

From: Andrey Konovalov <andreyknvl@...gle.com>

Group functions that [de]populate shadow memory for vmalloc.
Group functions that [un]poison memory for vmalloc.

This patch does no functional changes but prepares KASAN code for
adding vmalloc support to HW_TAGS KASAN.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 include/linux/kasan.h | 20 +++++++++-----------
 mm/kasan/shadow.c     | 43 ++++++++++++++++++++++---------------------
 2 files changed, 31 insertions(+), 32 deletions(-)

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 4eec58e6ef82..af2dd67d2c0e 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -417,34 +417,32 @@ static inline void kasan_init_hw_tags(void) { }
 
 #ifdef CONFIG_KASAN_VMALLOC
 
+void kasan_populate_early_vm_area_shadow(void *start, unsigned long size);
 int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
-void kasan_poison_vmalloc(const void *start, unsigned long size);
-void kasan_unpoison_vmalloc(const void *start, unsigned long size);
 void kasan_release_vmalloc(unsigned long start, unsigned long end,
 			   unsigned long free_region_start,
 			   unsigned long free_region_end);
 
-void kasan_populate_early_vm_area_shadow(void *start, unsigned long size);
+void kasan_unpoison_vmalloc(const void *start, unsigned long size);
+void kasan_poison_vmalloc(const void *start, unsigned long size);
 
 #else /* CONFIG_KASAN_VMALLOC */
 
+static inline void kasan_populate_early_vm_area_shadow(void *start,
+						       unsigned long size) { }
 static inline int kasan_populate_vmalloc(unsigned long start,
 					unsigned long size)
 {
 	return 0;
 }
-
-static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
-{ }
-static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
-{ }
 static inline void kasan_release_vmalloc(unsigned long start,
 					 unsigned long end,
 					 unsigned long free_region_start,
-					 unsigned long free_region_end) {}
+					 unsigned long free_region_end) { }
 
-static inline void kasan_populate_early_vm_area_shadow(void *start,
-						       unsigned long size)
+static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
+{ }
+static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
 { }
 
 #endif /* CONFIG_KASAN_VMALLOC */
diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index 585c2bf1073b..49a3660e111a 100644
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -345,27 +345,6 @@ int kasan_populate_vmalloc(unsigned long addr, unsigned long size)
 	return 0;
 }
 
-/*
- * Poison the shadow for a vmalloc region. Called as part of the
- * freeing process at the time the region is freed.
- */
-void kasan_poison_vmalloc(const void *start, unsigned long size)
-{
-	if (!is_vmalloc_or_module_addr(start))
-		return;
-
-	size = round_up(size, KASAN_GRANULE_SIZE);
-	kasan_poison(start, size, KASAN_VMALLOC_INVALID, false);
-}
-
-void kasan_unpoison_vmalloc(const void *start, unsigned long size)
-{
-	if (!is_vmalloc_or_module_addr(start))
-		return;
-
-	kasan_unpoison(start, size, false);
-}
-
 static int kasan_depopulate_vmalloc_pte(pte_t *ptep, unsigned long addr,
 					void *unused)
 {
@@ -496,6 +475,28 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end,
 	}
 }
 
+
+void kasan_unpoison_vmalloc(const void *start, unsigned long size)
+{
+	if (!is_vmalloc_or_module_addr(start))
+		return;
+
+	kasan_unpoison(start, size, false);
+}
+
+/*
+ * Poison the shadow for a vmalloc region. Called as part of the
+ * freeing process at the time the region is freed.
+ */
+void kasan_poison_vmalloc(const void *start, unsigned long size)
+{
+	if (!is_vmalloc_or_module_addr(start))
+		return;
+
+	size = round_up(size, KASAN_GRANULE_SIZE);
+	kasan_poison(start, size, KASAN_VMALLOC_INVALID, false);
+}
+
 #else /* CONFIG_KASAN_VMALLOC */
 
 int kasan_alloc_module_shadow(void *addr, size_t size)
-- 
2.25.1