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[35.204.162.40]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5e4c43a55besm8891211a12.72.2025.03.04.18.17.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Mar 2025 18:17:32 -0800 (PST) From: jeffxu@chromium.org To: akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, torvalds@linux-foundation.org, vbabka@suse.cz, lorenzo.stoakes@oracle.com, Liam.Howlett@Oracle.com, adhemerval.zanella@linaro.org, oleg@redhat.com, avagin@gmail.com, benjamin@sipsolutions.net Cc: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, jorgelo@chromium.org, sroettger@google.com, hch@lst.de, ojeda@kernel.org, thomas.weissschuh@linutronix.de, adobriyan@gmail.com, johannes@sipsolutions.net, pedro.falcato@gmail.com, hca@linux.ibm.com, willy@infradead.org, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, peterx@redhat.com, f.fainelli@gmail.com, gerg@kernel.org, dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org, mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org, ardb@google.com, enh@google.com, rientjes@google.com, groeck@chromium.org, mpe@ellerman.id.au, aleksandr.mikhalitsyn@canonical.com, mike.rapoport@gmail.com, Jeff Xu Subject: [PATCH v9 7/7] selftest: test system mappings are sealed. Date: Wed, 5 Mar 2025 02:17:11 +0000 Message-ID: <20250305021711.3867874-8-jeffxu@google.com> X-Mailer: git-send-email 2.48.1.711.g2feabab25a-goog In-Reply-To: <20250305021711.3867874-1-jeffxu@google.com> References: <20250305021711.3867874-1-jeffxu@google.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jeff Xu Add sysmap_is_sealed.c to test system mappings are sealed. Note: CONFIG_MSEAL_SYSTEM_MAPPINGS must be set, as indicated in config file. Signed-off-by: Jeff Xu Reviewed-by: Lorenzo Stoakes Reviewed-by: Kees Cook --- tools/testing/selftests/Makefile | 1 + .../mseal_system_mappings/.gitignore | 2 + .../selftests/mseal_system_mappings/Makefile | 6 + .../selftests/mseal_system_mappings/config | 1 + .../mseal_system_mappings/sysmap_is_sealed.c | 119 ++++++++++++++++++ 5 files changed, 129 insertions(+) create mode 100644 tools/testing/selftests/mseal_system_mappings/.gitignore create mode 100644 tools/testing/selftests/mseal_system_mappings/Makefile create mode 100644 tools/testing/selftests/mseal_system_mappings/config create mode 100644 tools/testing/selftests/mseal_system_mappings/sysmap_is_sealed.c diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index 8daac70c2f9d..be836be8f03f 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -61,6 +61,7 @@ TARGETS += mount TARGETS += mount_setattr TARGETS += move_mount_set_group TARGETS += mqueue +TARGETS += mseal_system_mappings TARGETS += nci TARGETS += net TARGETS += net/af_unix diff --git a/tools/testing/selftests/mseal_system_mappings/.gitignore b/tools/testing/selftests/mseal_system_mappings/.gitignore new file mode 100644 index 000000000000..319c497a595e --- /dev/null +++ b/tools/testing/selftests/mseal_system_mappings/.gitignore @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +sysmap_is_sealed diff --git a/tools/testing/selftests/mseal_system_mappings/Makefile b/tools/testing/selftests/mseal_system_mappings/Makefile new file mode 100644 index 000000000000..2b4504e2f52f --- /dev/null +++ b/tools/testing/selftests/mseal_system_mappings/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +CFLAGS += -std=c99 -pthread -Wall $(KHDR_INCLUDES) + +TEST_GEN_PROGS := sysmap_is_sealed + +include ../lib.mk diff --git a/tools/testing/selftests/mseal_system_mappings/config b/tools/testing/selftests/mseal_system_mappings/config new file mode 100644 index 000000000000..675cb9f37b86 --- /dev/null +++ b/tools/testing/selftests/mseal_system_mappings/config @@ -0,0 +1 @@ +CONFIG_MSEAL_SYSTEM_MAPPINGS=y diff --git a/tools/testing/selftests/mseal_system_mappings/sysmap_is_sealed.c b/tools/testing/selftests/mseal_system_mappings/sysmap_is_sealed.c new file mode 100644 index 000000000000..0d2af30c3bf5 --- /dev/null +++ b/tools/testing/selftests/mseal_system_mappings/sysmap_is_sealed.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * test system mappings are sealed when + * KCONFIG_MSEAL_SYSTEM_MAPPINGS=y + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include + +#include "../kselftest.h" +#include "../kselftest_harness.h" + +#define VMFLAGS "VmFlags:" +#define MSEAL_FLAGS "sl" +#define MAX_LINE_LEN 512 + +bool has_mapping(char *name, FILE *maps) +{ + char line[MAX_LINE_LEN]; + + while (fgets(line, sizeof(line), maps)) { + if (strstr(line, name)) + return true; + } + + return false; +} + +bool mapping_is_sealed(char *name, FILE *maps) +{ + char line[MAX_LINE_LEN]; + + while (fgets(line, sizeof(line), maps)) { + if (!strncmp(line, VMFLAGS, strlen(VMFLAGS))) { + if (strstr(line, MSEAL_FLAGS)) + return true; + + return false; + } + } + + return false; +} + +FIXTURE(basic) { + FILE *maps; +}; + +FIXTURE_SETUP(basic) +{ + self->maps = fopen("/proc/self/smaps", "r"); + if (!self->maps) + SKIP(return, "Could not open /proc/self/smap, errno=%d", + errno); +}; + +FIXTURE_TEARDOWN(basic) +{ + if (self->maps) + fclose(self->maps); +}; + +FIXTURE_VARIANT(basic) +{ + char *name; + bool sealed; +}; + +FIXTURE_VARIANT_ADD(basic, vdso) { + .name = "[vdso]", + .sealed = true, +}; + +FIXTURE_VARIANT_ADD(basic, vvar) { + .name = "[vvar]", + .sealed = true, +}; + +FIXTURE_VARIANT_ADD(basic, vvar_vclock) { + .name = "[vvar_vclock]", + .sealed = true, +}; + +FIXTURE_VARIANT_ADD(basic, sigpage) { + .name = "[sigpage]", + .sealed = true, +}; + +FIXTURE_VARIANT_ADD(basic, vectors) { + .name = "[vectors]", + .sealed = true, +}; + +FIXTURE_VARIANT_ADD(basic, uprobes) { + .name = "[uprobes]", + .sealed = true, +}; + +FIXTURE_VARIANT_ADD(basic, stack) { + .name = "[stack]", + .sealed = false, +}; + +TEST_F(basic, check_sealed) +{ + if (!has_mapping(variant->name, self->maps)) { + SKIP(return, "could not find the mapping, %s", + variant->name); + } + + EXPECT_EQ(variant->sealed, + mapping_is_sealed(variant->name, self->maps)); +}; + +TEST_HARNESS_MAIN