malloc_header
struct malloc_header *mh;
hdroffset = PAGE_SIZE - sizeof(struct malloc_header);
allocsize = sizeof(struct malloc_header) + size;
struct malloc_header *mh;
kasan_mark(addr, mh->mh_size - sizeof(struct malloc_header),
mh->mh_size - sizeof(struct malloc_header), KASAN_MALLOC_REDZONE);
if (mh->mh_size >= PAGE_SIZE + sizeof(struct malloc_header)) {
mh->mh_size + PAGE_SIZE - sizeof(struct malloc_header),
mh->mh_size + PAGE_SIZE - sizeof(struct malloc_header));
struct malloc_header *mh;
cursize = mh->mh_size - sizeof(struct malloc_header);