On Wed, Jan 20, 2021 at 08:06:08PM +0200, Mike Rapoport wrote:
> +static int secretmem_pool_increase(struct secretmem_ctx *ctx, gfp_t gfp)
> {
> + unsigned long nr_pages = (1 << PMD_PAGE_ORDER);
> + struct gen_pool *pool = ctx->pool;
> + unsigned long addr;
> + struct page *page;
> + int err;
> +
> + page = cma_alloc(secretmem_cma, nr_pages, PMD_SIZE, gfp & __GFP_NOWARN);
> + if (!page)
> + return -ENOMEM;
Does cma_alloc() zero the pages it allocates? If not, where do we avoid
leaking kernel memory to userspace?
