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Sat, 19 Jul 2025 05:41:29 -0700 (PDT) From: Abhinav Saxena Date: Sat, 19 Jul 2025 06:41:25 -0600 Subject: [PATCH RFC 2/3] selftests/landlock: add cross-domain variants Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20250719-landlock_abstractions-v1-2-2c4fd61f8973@gmail.com> References: <20250719-landlock_abstractions-v1-0-2c4fd61f8973@gmail.com> In-Reply-To: <20250719-landlock_abstractions-v1-0-2c4fd61f8973@gmail.com> To: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= , =?utf-8?q?G=C3=BCnther_Noack?= , Shuah Khan Cc: linux-security-module@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Abhinav Saxena X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1752928886; l=3000; i=xandfury@gmail.com; s=20250614; h=from:subject:message-id; bh=c2iSIbfl72/PE02qKxd2sEEW21TnRnWXjbbFM17kfms=; b=AG1PkSmxesoDAXXR54orzBnHfJrxDfASpS3LQ+PFVWCcUWnpup/4+AddHt0UO1Gn4lcUXj4dj wd8t5Ina6bjAQt28O+BxACTRKI30wLf9pOO6oF4pltwfKOvn2yz+5al X-Developer-Key: i=xandfury@gmail.com; a=ed25519; pk=YN6w7WNet8skqvMWxhG5BlAmtd1SQmo8If6Mofh4k44= Add scoped_cross_domain_variants.h providing shared test variants for interactions between two independent Landlock domains. Current tests only cover hierarchical (parent-child) relationships but miss the case where unrelated processes establish peer domains. The header defines four canonical variants: - none_to_none: both processes unrestricted - none_to_scoped: only accessor process scoped - scoped_to_none: only resource process scoped - scoped_to_scoped: both processes scoped (peer domains) This abstraction will be shared across signal, abstract UNIX socket, and future scope types (like memfd execution) to ensure comprehensive cross-domain test coverage. Signed-off-by: Abhinav Saxena --- .../landlock/scoped_cross_domain_variants.h | 54 ++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/tools/testing/selftests/landlock/scoped_cross_domain_variants.h b/tools/testing/selftests/landlock/scoped_cross_domain_variants.h new file mode 100644 index 000000000000..6068987a52c8 --- /dev/null +++ b/tools/testing/selftests/landlock/scoped_cross_domain_variants.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Landlock self-tests - cross-domain scope variants + * + * Provides one FIXTURE_VARIANT and the four canonical combinations + * (none->none, none->scoped, scoped->none, scoped->scoped). Every test that + * checks interactions between two independently created domains + * includes this header and iterates over the variants. + * + * Variant structure: which domain each side of the interaction lives in. + * resource_domain - process that creates/owns the resource + * accessor_domain - process that uses the resource + * + * Copyright © 2025 Abhinav Saxena + * + */ + +FIXTURE_VARIANT(cross_domain_scope) +{ + enum sandbox_type resource_domain; + enum sandbox_type accessor_domain; +}; + +/* Four concrete combinations */ +FIXTURE_VARIANT_ADD(cross_domain_scope, none_to_none) { + .resource_domain = NO_SANDBOX, + .accessor_domain = NO_SANDBOX, +}; + +FIXTURE_VARIANT_ADD(cross_domain_scope, none_to_scoped) { + .resource_domain = NO_SANDBOX, + .accessor_domain = SCOPE_SANDBOX, +}; + +FIXTURE_VARIANT_ADD(cross_domain_scope, scoped_to_none) { + .resource_domain = SCOPE_SANDBOX, + .accessor_domain = NO_SANDBOX, +}; + +FIXTURE_VARIANT_ADD(cross_domain_scope, scoped_to_scoped) { + .resource_domain = SCOPE_SANDBOX, + .accessor_domain = SCOPE_SANDBOX, +}; + +/* + * Mapping reminder: + * SIGNAL resource = receiver accessor = sender + * ABSTRACT UNIX resource = server accessor = client + * future scopes resource = creator accessor = user + * + * Only the accessor domain is enforced; tests therefore expect: + * accessor NO_SANDBOX -> ALLOW operation + * accessor SCOPE_SANDBOX -> DENY if resource is outside its domain + */ -- 2.43.0