selftests/landlock: Use scoped_base_variants.h for ptrace_test

ptrace_test.c currently contains a duplicated version of the
scoped_domains fixture variants.  This patch removes that and make it use
the shared scoped_base_variants.h instead, like in
scoped_abstract_unix_test and scoped_signal_test.

This required renaming the hierarchy fixture to scoped_domains, but the
test is otherwise the same.

Cc: Tahera Fahimi <fahimitahera@gmail.com>
Signed-off-by: Tingmao Wang <m@maowtm.org>
Link: https://lore.kernel.org/r/48148f0134f95f819a25277486a875a6fd88ecf9.1766885035.git.m@maowtm.org
Signed-off-by: Mickaël Salaün <mic@digikod.net>

Author: micromaomao

tools/testing/selftests/landlock/ptrace_test.c

@@ -86,16 +86,9 @@ static int get_yama_ptrace_scope(void)
 }
 
 /* clang-format off */
-FIXTURE(hierarchy) {};
+FIXTURE(scoped_domains) {};
 /* clang-format on */
 
-FIXTURE_VARIANT(hierarchy)
-{
-	const bool domain_both;
-	const bool domain_parent;
-	const bool domain_child;
-};
-
 /*
  * Test multiple tracing combinations between a parent process P1 and a child
  * process P2.
@@ -104,155 +97,18 @@ FIXTURE_VARIANT(hierarchy)
  * restriction is enforced in addition to any Landlock check, which means that
  * all P2 requests to trace P1 would be denied.
  */
+#include "scoped_base_variants.h"
 
-/*
- *        No domain
- *
- *   P1-.               P1 -> P2 : allow
- *       \              P2 -> P1 : allow
- *        'P2
- */
-/* clang-format off */
-FIXTURE_VARIANT_ADD(hierarchy, allow_without_domain) {
-	/* clang-format on */
-	.domain_both = false,
-	.domain_parent = false,
-	.domain_child = false,
-};
-
-/*
- *        Child domain
- *
- *   P1--.              P1 -> P2 : allow
- *        \             P2 -> P1 : deny
- *        .'-----.
- *        |  P2  |
- *        '------'
- */
-/* clang-format off */
-FIXTURE_VARIANT_ADD(hierarchy, allow_with_one_domain) {
-	/* clang-format on */
-	.domain_both = false,
-	.domain_parent = false,
-	.domain_child = true,
-};
-
-/*
- *        Parent domain
- * .------.
- * |  P1  --.           P1 -> P2 : deny
- * '------'  \          P2 -> P1 : allow
- *            '
- *            P2
- */
-/* clang-format off */
-FIXTURE_VARIANT_ADD(hierarchy, deny_with_parent_domain) {
-	/* clang-format on */
-	.domain_both = false,
-	.domain_parent = true,
-	.domain_child = false,
-};
-
-/*
- *        Parent + child domain (siblings)
- * .------.
- * |  P1  ---.          P1 -> P2 : deny
- * '------'   \         P2 -> P1 : deny
- *         .---'--.
- *         |  P2  |
- *         '------'
- */
-/* clang-format off */
-FIXTURE_VARIANT_ADD(hierarchy, deny_with_sibling_domain) {
-	/* clang-format on */
-	.domain_both = false,
-	.domain_parent = true,
-	.domain_child = true,
-};
-
-/*
- *         Same domain (inherited)
- * .-------------.
- * | P1----.     |      P1 -> P2 : allow
- * |        \    |      P2 -> P1 : allow
- * |         '   |
- * |         P2  |
- * '-------------'
- */
-/* clang-format off */
-FIXTURE_VARIANT_ADD(hierarchy, allow_sibling_domain) {
-	/* clang-format on */
-	.domain_both = true,
-	.domain_parent = false,
-	.domain_child = false,
-};
-
-/*
- *         Inherited + child domain
- * .-----------------.
- * |  P1----.        |  P1 -> P2 : allow
- * |         \       |  P2 -> P1 : deny
- * |        .-'----. |
- * |        |  P2  | |
- * |        '------' |
- * '-----------------'
- */
-/* clang-format off */
-FIXTURE_VARIANT_ADD(hierarchy, allow_with_nested_domain) {
-	/* clang-format on */
-	.domain_both = true,
-	.domain_parent = false,
-	.domain_child = true,
-};
-
-/*
- *         Inherited + parent domain
- * .-----------------.
- * |.------.         |  P1 -> P2 : deny
- * ||  P1  ----.     |  P2 -> P1 : allow
- * |'------'    \    |
- * |             '   |
- * |             P2  |
- * '-----------------'
- */
-/* clang-format off */
-FIXTURE_VARIANT_ADD(hierarchy, deny_with_nested_and_parent_domain) {
-	/* clang-format on */
-	.domain_both = true,
-	.domain_parent = true,
-	.domain_child = false,
-};
-
-/*
- *         Inherited + parent and child domain (siblings)
- * .-----------------.
- * | .------.        |  P1 -> P2 : deny
- * | |  P1  .        |  P2 -> P1 : deny
- * | '------'\       |
- * |          \      |
- * |        .--'---. |
- * |        |  P2  | |
- * |        '------' |
- * '-----------------'
- */
-/* clang-format off */
-FIXTURE_VARIANT_ADD(hierarchy, deny_with_forked_domain) {
-	/* clang-format on */
-	.domain_both = true,
-	.domain_parent = true,
-	.domain_child = true,
-};
-
-FIXTURE_SETUP(hierarchy)
+FIXTURE_SETUP(scoped_domains)
 {
 }
 
-FIXTURE_TEARDOWN(hierarchy)
+FIXTURE_TEARDOWN(scoped_domains)
 {
 }
 
 /* Test PTRACE_TRACEME and PTRACE_ATTACH for parent and child. */
-TEST_F(hierarchy, trace)
+TEST_F(scoped_domains, trace)
 {
 	pid_t child, parent;
 	int status, err_proc_read;

tools/testing/selftests/landlock/scoped_base_variants.h

@@ -1,8 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Landlock scoped_domains variants
+ * Landlock scoped_domains test variant definition.
  *
- * See the hierarchy variants from ptrace_test.c
+ * This file defines a fixture variant "scoped_domains" that has all
+ * permutations of parent/child process being in separate or shared
+ * Landlock domain, or not being in a Landlock domain at all.
+ *
+ * Scoped access tests can include this file to avoid repeating these
+ * combinations.
  *
  * Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
  * Copyright © 2019-2020 ANSSI