[PATCH RFC 11/20] kasan: introduce poison_kmalloc_large_redzone

[andrey.konovalov@xxxxxxxxx]

From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>

Split out a poison_kmalloc_large_redzone helper from
__kasan_kmalloc_large and use it in the caller's code.

This is a preparatory change for the following patches in this series.

Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
---
 mm/kasan/common.c | 41 +++++++++++++++++++++++------------------
 1 file changed, 23 insertions(+), 18 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index ceb06d5f169f..b50e4fbaf238 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -353,23 +353,12 @@ void * __must_check __kasan_kmalloc(struct kmem_cache *cache, const void *object
 }
 EXPORT_SYMBOL(__kasan_kmalloc);
 
-void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size,
+static inline void poison_kmalloc_large_redzone(const void *ptr, size_t size,
 						gfp_t flags)
 {
 	unsigned long redzone_start;
 	unsigned long redzone_end;
 
-	if (gfpflags_allow_blocking(flags))
-		kasan_quarantine_reduce();
-
-	if (unlikely(ptr == NULL))
-		return NULL;
-
-	/*
-	 * The object has already been unpoisoned by kasan_unpoison_pages() for
-	 * alloc_pages() or by kasan_krealloc() for krealloc().
-	 */
-
 	/*
 	 * The redzone has byte-level precision for the generic mode.
 	 * Partially poison the last object granule to cover the unaligned
@@ -379,12 +368,25 @@ void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size,
 		kasan_poison_last_granule(ptr, size);
 
 	/* Poison the aligned part of the redzone. */
-	redzone_start = round_up((unsigned long)(ptr + size),
-				KASAN_GRANULE_SIZE);
+	redzone_start = round_up((unsigned long)(ptr + size), KASAN_GRANULE_SIZE);
 	redzone_end = (unsigned long)ptr + page_size(virt_to_page(ptr));
 	kasan_poison((void *)redzone_start, redzone_end - redzone_start,
 		     KASAN_PAGE_REDZONE, false);
+}
 
+void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size,
+						gfp_t flags)
+{
+	if (gfpflags_allow_blocking(flags))
+		kasan_quarantine_reduce();
+
+	if (unlikely(ptr == NULL))
+		return NULL;
+
+	/* The object has already been unpoisoned by kasan_unpoison_pages(). */
+	poison_kmalloc_large_redzone(ptr, size, flags);
+
+	/* Keep the tag that was set by alloc_pages(). */
 	return (void *)ptr;
 }
 
@@ -392,6 +394,9 @@ void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flag
 {
 	struct slab *slab;
 
+	if (gfpflags_allow_blocking(flags))
+		kasan_quarantine_reduce();
+
 	if (unlikely(object == ZERO_SIZE_PTR))
 		return (void *)object;
 
@@ -409,11 +414,11 @@ void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flag
 
 	/* Piggy-back on kmalloc() instrumentation to poison the redzone. */
 	if (unlikely(!slab))
-		return __kasan_kmalloc_large(object, size, flags);
-	else {
+		poison_kmalloc_large_redzone(object, size, flags);
+	else
 		poison_kmalloc_redzone(slab->slab_cache, object, size, flags);
-		return (void *)object;
-	}
+
+	return (void *)object;
 }
 
 bool __kasan_mempool_poison_pages(struct page *page, unsigned int order,
-- 
2.25.1