linux-kernel - Re: [PATCH V8 13/44] mm/pkeys: Add initial PKS Test code

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Date:   Mon, 31 Jan 2022 19:30:14 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "hpa@...or.com" <hpa@...or.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
CC:     "Yu, Fenghua" <fenghua.yu@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V8 13/44] mm/pkeys: Add initial PKS Test code

On Thu, 2022-01-27 at 09:54 -0800, ira.weiny@...el.com wrote:
> +static void crash_it(void)
> +{
> +       struct pks_test_ctx *ctx;
> +       void *ptr;
> +
> +       pr_warn("     ***** BEGIN: Unhandled fault test *****\n");
> +
> +       ctx = alloc_ctx(PKS_KEY_TEST);
> +       if (IS_ERR(ctx)) {
> +               pr_err("Failed to allocate context???\n");
> +               return;
> +       }
> +
> +       ptr = alloc_test_page(ctx->pkey);
> +       if (!ptr) {
> +               pr_err("Failed to vmalloc page???\n");
> +               return;
> +       }
> +
> +       /* This purposely faults */
> +       memcpy(ptr, ctx->data, 8);
> +
> +       /* Should never get here if so the test failed */
> +       last_test_pass = false;
> +
> +       vfree(ptr);
> +       free_ctx(ctx);

So these only gets cleaned up if the test fails? Could you clean them
up in pks_release_file() like the later test patch?

> +}

snip

> +
> +static void __exit pks_test_exit(void)
> +{
> +       debugfs_remove(pks_test_dentry);
> +       pr_info("test exit\n");
> +}

How does this get called?