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-rw-r--r--mm/kmemcheck.c125
1 files changed, 0 insertions, 125 deletions
diff --git a/mm/kmemcheck.c b/mm/kmemcheck.c
index 800d64b..cec5940 100644
--- a/mm/kmemcheck.c
+++ b/mm/kmemcheck.c
@@ -1,126 +1 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/gfp.h>
-#include <linux/mm_types.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include "slab.h"
-#include <linux/kmemcheck.h>
-
-void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node)
-{
- struct page *shadow;
- int pages;
- int i;
-
- pages = 1 << order;
-
- /*
- * With kmemcheck enabled, we need to allocate a memory area for the
- * shadow bits as well.
- */
- shadow = alloc_pages_node(node, flags | __GFP_NOTRACK, order);
- if (!shadow) {
- if (printk_ratelimit())
- pr_err("kmemcheck: failed to allocate shadow bitmap\n");
- return;
- }
-
- for(i = 0; i < pages; ++i)
- page[i].shadow = page_address(&shadow[i]);
-
- /*
- * Mark it as non-present for the MMU so that our accesses to
- * this memory will trigger a page fault and let us analyze
- * the memory accesses.
- */
- kmemcheck_hide_pages(page, pages);
-}
-
-void kmemcheck_free_shadow(struct page *page, int order)
-{
- struct page *shadow;
- int pages;
- int i;
-
- if (!kmemcheck_page_is_tracked(page))
- return;
-
- pages = 1 << order;
-
- kmemcheck_show_pages(page, pages);
-
- shadow = virt_to_page(page[0].shadow);
-
- for(i = 0; i < pages; ++i)
- page[i].shadow = NULL;
-
- __free_pages(shadow, order);
-}
-
-void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
- size_t size)
-{
- if (unlikely(!object)) /* Skip object if allocation failed */
- return;
-
- /*
- * Has already been memset(), which initializes the shadow for us
- * as well.
- */
- if (gfpflags & __GFP_ZERO)
- return;
-
- /* No need to initialize the shadow of a non-tracked slab. */
- if (s->flags & SLAB_NOTRACK)
- return;
-
- if (!kmemcheck_enabled || gfpflags & __GFP_NOTRACK) {
- /*
- * Allow notracked objects to be allocated from
- * tracked caches. Note however that these objects
- * will still get page faults on access, they just
- * won't ever be flagged as uninitialized. If page
- * faults are not acceptable, the slab cache itself
- * should be marked NOTRACK.
- */
- kmemcheck_mark_initialized(object, size);
- } else if (!s->ctor) {
- /*
- * New objects should be marked uninitialized before
- * they're returned to the called.
- */
- kmemcheck_mark_uninitialized(object, size);
- }
-}
-
-void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size)
-{
- /* TODO: RCU freeing is unsupported for now; hide false positives. */
- if (!s->ctor && !(s->flags & SLAB_TYPESAFE_BY_RCU))
- kmemcheck_mark_freed(object, size);
-}
-
-void kmemcheck_pagealloc_alloc(struct page *page, unsigned int order,
- gfp_t gfpflags)
-{
- int pages;
-
- if (gfpflags & (__GFP_HIGHMEM | __GFP_NOTRACK))
- return;
-
- pages = 1 << order;
-
- /*
- * NOTE: We choose to track GFP_ZERO pages too; in fact, they
- * can become uninitialized by copying uninitialized memory
- * into them.
- */
-
- /* XXX: Can use zone->node for node? */
- kmemcheck_alloc_shadow(page, order, gfpflags, -1);
-
- if (gfpflags & __GFP_ZERO)
- kmemcheck_mark_initialized_pages(page, pages);
- else
- kmemcheck_mark_uninitialized_pages(page, pages);
-}
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