cregit-Linux how code gets into the kernel

Release 4.8 mm/kmemcheck.c

Directory: mm
#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); }


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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); }


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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); } }


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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_DESTROY_BY_RCU)) kmemcheck_mark_freed(object, size); }


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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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Overall Contributors

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jesper dangaard brouerjesper dangaard brouer102.45%116.67%
joonsoo kimjoonsoo kim30.74%116.67%
joe perchesjoe perches20.49%233.33%
Directory: mm
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