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authorAndrey Ryabinin <a.ryabinin@samsung.com>2015-04-15 16:15:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-15 16:35:20 -0700
commit923936157b158f36bd6a3d86496dce82b1a957de (patch)
tree4a78fc384c220efad52d250b49795b535fbc2db0 /mm/kasan
parentbda6d33042a486c8f7b15bf15a80fd07d4eab204 (diff)
downloadlwn-923936157b158f36bd6a3d86496dce82b1a957de.tar.gz
lwn-923936157b158f36bd6a3d86496dce82b1a957de.zip
mm/mempool.c: kasan: poison mempool elements
Mempools keep allocated objects in reserved for situations when ordinary allocation may not be possible to satisfy. These objects shouldn't be accessed before they leave the pool. This patch poison elements when get into the pool and unpoison when they leave it. This will let KASan to detect use-after-free of mempool's elements. Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Tested-by: David Rientjes <rientjes@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dmitry Chernenkov <drcheren@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Alexander Potapenko <glider@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/kasan.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 936d81661c47..6c513a63ea84 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -389,6 +389,19 @@ void kasan_krealloc(const void *object, size_t size)
kasan_kmalloc(page->slab_cache, object, size);
}
+void kasan_kfree(void *ptr)
+{
+ struct page *page;
+
+ page = virt_to_head_page(ptr);
+
+ if (unlikely(!PageSlab(page)))
+ kasan_poison_shadow(ptr, PAGE_SIZE << compound_order(page),
+ KASAN_FREE_PAGE);
+ else
+ kasan_slab_free(page->slab_cache, ptr);
+}
+
void kasan_kfree_large(const void *ptr)
{
struct page *page = virt_to_page(ptr);