#include #include #include #include #include "slab.h" #include 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_DESTROY_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); } root/include/memory
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-05 23:06:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-05 23:06:06 -0800
commit6989606a7224a2d5a925df22a49e4f7a0bfed0d6 (patch)
tree2fb686a4dea9a7f4beec97fde510f2840c8e06f9 /include/memory
parented40875dd4b4c7b5c991db9e06c984180ab0b3ce (diff)
parentbe29d20f3f5db1f0b4e49a4f6eeedf840e2bf9b1 (diff)
Merge branch 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit
Pull audit fixes from Paul Moore: "Two small fixes relating to audit's use of fsnotify. The first patch plugs a leak and the second fixes some lock shenanigans. The patches are small and I banged on this for an afternoon with our testsuite and didn't see anything odd" * 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit: audit: Fix sleep in atomic fsnotify: Remove fsnotify_duplicate_mark()
Diffstat (limited to 'include/memory')