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[34.168.184.9]) by smtp.gmail.com with UTF8SMTPSA id t5-20020a62ea05000000b0068be4ce33easm18623342pfh.96.2023.10.16.07.39.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Oct 2023 07:39:06 -0700 (PDT) From: jeffxu@chromium.org To: akpm@linux-foundation.org, keescook@chromium.org, sroettger@google.com Cc: jeffxu@google.com, jorgelo@chromium.org, groeck@chromium.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, jannh@google.com, surenb@google.com, alex.sierra@amd.com, apopple@nvidia.com, aneesh.kumar@linux.ibm.com, axelrasmussen@google.com, ben@decadent.org.uk, catalin.marinas@arm.com, david@redhat.com, dwmw@amazon.co.uk, ying.huang@intel.com, hughd@google.com, joey.gouly@arm.com, corbet@lwn.net, wangkefeng.wang@huawei.com, Liam.Howlett@oracle.com, torvalds@linux-foundation.org, lstoakes@gmail.com, willy@infradead.org, mawupeng1@huawei.com, linmiaohe@huawei.com, namit@vmware.com, peterx@redhat.com, peterz@infradead.org, ryan.roberts@arm.com, shr@devkernel.io, vbabka@suse.cz, xiujianfeng@huawei.com, yu.ma@intel.com, zhangpeng362@huawei.com, dave.hansen@intel.com, luto@kernel.org, linux-hardening@vger.kernel.org Subject: [RFC PATCH v1 8/8] selftest mm/mseal mprotect/munmap/mremap/mmap Date: Mon, 16 Oct 2023 14:38:27 +0000 Message-ID: <20231016143828.647848-9-jeffxu@chromium.org> X-Mailer: git-send-email 2.42.0.655.g421f12c284-goog In-Reply-To: <20231016143828.647848-1-jeffxu@chromium.org> References: <20231016143828.647848-1-jeffxu@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jeff Xu selftest for sealing mprotect/munmap/mremap/mmap Signed-off-by: Jeff Xu --- tools/testing/selftests/mm/Makefile | 1 + tools/testing/selftests/mm/mseal_test.c | 1428 +++++++++++++++++++++++ 2 files changed, 1429 insertions(+) create mode 100644 tools/testing/selftests/mm/mseal_test.c diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index 6a9fc5693145..0c086cecc093 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -59,6 +59,7 @@ TEST_GEN_FILES += mlock2-tests TEST_GEN_FILES += mrelease_test TEST_GEN_FILES += mremap_dontunmap TEST_GEN_FILES += mremap_test +TEST_GEN_FILES += mseal_test TEST_GEN_FILES += on-fault-limit TEST_GEN_FILES += thuge-gen TEST_GEN_FILES += transhuge-stress diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c new file mode 100644 index 000000000000..d6ae09729394 --- /dev/null +++ b/tools/testing/selftests/mm/mseal_test.c @@ -0,0 +1,1428 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include "../kselftest.h" +#include +#include +#include +#include +#include + +#ifndef MM_SEAL_MSEAL +#define MM_SEAL_MSEAL 0x1 +#endif + +#ifndef MM_SEAL_MPROTECT +#define MM_SEAL_MPROTECT 0x2 +#endif + +#ifndef MM_SEAL_MUNMAP +#define MM_SEAL_MUNMAP 0x4 +#endif + +#ifndef MM_SEAL_MMAP +#define MM_SEAL_MMAP 0x8 +#endif + +#ifndef MM_SEAL_MREMAP +#define MM_SEAL_MREMAP 0x10 +#endif + +#ifndef DEBUG +#define LOG_TEST_ENTER() {} +#else +#define LOG_TEST_ENTER() { printf("%s\n", __func__); } +#endif + +static int sys_mseal(void *start, size_t len, int types) +{ + int sret; + + errno = 0; + sret = syscall(__NR_mseal, start, len, types, 0); + return sret; +} + +int sys_mprotect(void *ptr, size_t size, unsigned long prot) +{ + int sret; + + errno = 0; + sret = syscall(SYS_mprotect, ptr, size, prot); + return sret; +} + +int sys_munmap(void *ptr, size_t size) +{ + int sret; + + errno = 0; + sret = syscall(SYS_munmap, ptr, size); + return sret; +} + +static int sys_madvise(void *start, size_t len, int types) +{ + int sret; + + errno = 0; + sret = syscall(__NR_madvise, start, len, types); + return sret; +} + +void *addr1 = (void *)0x50000000; +void *addr2 = (void *)0x50004000; +void *addr3 = (void *)0x50008000; +void setup_single_address(int size, void **ptrOut) +{ + void *ptr; + + ptr = mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + assert(ptr != (void *)-1); + *ptrOut = ptr; +} + +void setup_single_fixed_address(int size, void **ptrOut) +{ + void *ptr; + + ptr = mmap(addr1, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + assert(ptr == (void *)addr1); + + *ptrOut = ptr; +} + +void clean_single_address(void *ptr, int size) +{ + int ret; + + ret = munmap(ptr, size); + assert(!ret); +} + +void seal_mprotect_single_address(void *ptr, int size) +{ + int ret; + + ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT); + assert(!ret); +} + +static void test_seal_addseals(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + /* adding seal one by one */ + ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT); + assert(!ret); + + ret = sys_mseal(ptr, size, MM_SEAL_MMAP); + assert(!ret); + + ret = sys_mseal(ptr, size, MM_SEAL_MREMAP); + assert(!ret); + + ret = sys_mseal(ptr, size, MM_SEAL_MSEAL); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_addseals_combined(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT); + assert(!ret); + + /* adding multiple seals */ + ret = sys_mseal(ptr, size, + MM_SEAL_MPROTECT | MM_SEAL_MMAP | MM_SEAL_MREMAP | + MM_SEAL_MSEAL); + assert(!ret); + + /* not adding more seal type, so ok. */ + ret = sys_mseal(ptr, size, + MM_SEAL_MMAP | MM_SEAL_MREMAP | MM_SEAL_MSEAL); + assert(!ret); + + /* not adding more seal type, so ok. */ + ret = sys_mseal(ptr, size, MM_SEAL_MSEAL); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_addseals_reject(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT | MM_SEAL_MSEAL); + assert(!ret); + + ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT); + assert(!ret); + + /* MM_SEAL_MSEAL is set, so not allow new seal type . */ + ret = sys_mseal(ptr, size, + MM_SEAL_MPROTECT | MM_SEAL_MMAP | MM_SEAL_MSEAL); + assert(ret < 0); + + ret = sys_mseal(ptr, size, MM_SEAL_MMAP); + assert(ret < 0); + + ret = sys_mseal(ptr, size, MM_SEAL_MMAP | MM_SEAL_MSEAL); + assert(ret < 0); + + clean_single_address(ptr, size); +} + +static void test_seal_unmapped_start(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + // munmap 2 pages from ptr. + ret = sys_munmap(ptr, 2 * page_size); + assert(!ret); + + // mprotect will fail because 2 pages from ptr are unmapped. + ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE); + assert(ret < 0); + + // mseal will fail because 2 pages from ptr are unmapped. + ret = sys_mseal(ptr, size, MM_SEAL_MSEAL); + assert(ret < 0); + + ret = sys_mseal(ptr + 2 * page_size, 2 * page_size, MM_SEAL_MSEAL); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_unmapped_middle(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + // munmap 2 pages from ptr + page. + ret = sys_munmap(ptr + page_size, 2 * page_size); + assert(!ret); + + // mprotect will fail, since size is 4 pages. + ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE); + assert(ret < 0); + + // mseal will fail as well. + ret = sys_mseal(ptr, size, MM_SEAL_MSEAL); + assert(ret < 0); + + /* we still can add seal to the first page and last page*/ + ret = sys_mseal(ptr, page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(!ret); + + ret = sys_mseal(ptr + 3 * page_size, page_size, + MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_unmapped_end(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + // unmap last 2 pages. + ret = sys_munmap(ptr + 2 * page_size, 2 * page_size); + assert(!ret); + + //mprotect will fail since last 2 pages are unmapped. + ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE); + assert(ret < 0); + + //mseal will fail as well. + ret = sys_mseal(ptr, size, MM_SEAL_MSEAL); + assert(ret < 0); + + /* The first 2 pages is not sealed, and can add seals */ + ret = sys_mseal(ptr, 2 * page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_multiple_vmas(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + // use mprotect to split the vma into 3. + ret = sys_mprotect(ptr + page_size, 2 * page_size, + PROT_READ | PROT_WRITE); + assert(!ret); + + // mprotect will get applied to all 4 pages - 3 VMAs. + ret = sys_mprotect(ptr, size, PROT_READ); + assert(!ret); + + // use mprotect to split the vma into 3. + ret = sys_mprotect(ptr + page_size, 2 * page_size, + PROT_READ | PROT_WRITE); + assert(!ret); + + // mseal get applied to all 4 pages - 3 VMAs. + ret = sys_mseal(ptr, size, MM_SEAL_MSEAL); + assert(!ret); + + // verify additional seal type will fail after MM_SEAL_MSEAL set. + ret = sys_mseal(ptr, page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(ret < 0); + + ret = sys_mseal(ptr + page_size, 2 * page_size, + MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(ret < 0); + + ret = sys_mseal(ptr + 3 * page_size, page_size, + MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(ret < 0); + + clean_single_address(ptr, size); +} + +static void test_seal_split_start(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + /* use mprotect to split at middle */ + ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE); + assert(!ret); + + /* seal the first page, this will split the VMA */ + ret = sys_mseal(ptr, page_size, MM_SEAL_MSEAL); + assert(!ret); + + /* can't add seal to the first page */ + ret = sys_mseal(ptr, page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(ret < 0); + + /* add seal to the remain 3 pages */ + ret = sys_mseal(ptr + page_size, 3 * page_size, + MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_split_end(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_fixed_address(size, &ptr); + + /* use mprotect to split at middle */ + ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE); + assert(!ret); + + /* seal the last page */ + ret = sys_mseal(ptr + 3 * page_size, page_size, MM_SEAL_MSEAL); + assert(!ret); + + /* adding seal to the last page is rejected. */ + ret = sys_mseal(ptr + 3 * page_size, page_size, + MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(ret < 0); + + /* Adding seals to the first 3 pages */ + ret = sys_mseal(ptr, 3 * page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_invalid_input(void) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_fixed_address(size, &ptr); + + /* invalid flag */ + ret = sys_mseal(ptr, size, 0x20); + assert(ret < 0); + + ret = sys_mseal(ptr, size, 0x31); + assert(ret < 0); + + ret = sys_mseal(ptr, size, 0x3F); + assert(ret < 0); + + /* unaligned address */ + ret = sys_mseal(ptr + 1, 2 * page_size, MM_SEAL_MSEAL); + assert(ret < 0); + + /* length too big */ + ret = sys_mseal(ptr, 5 * page_size, MM_SEAL_MSEAL); + assert(ret < 0); + + /* start is not in a valid VMA */ + ret = sys_mseal(ptr - page_size, 5 * page_size, MM_SEAL_MSEAL); + assert(ret < 0); + + clean_single_address(ptr, size); +} + +static void test_seal_zero_length(void) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + ret = sys_mprotect(ptr, 0, PROT_READ | PROT_WRITE); + assert(!ret); + + /* seal 0 length will be OK, same as mprotect */ + ret = sys_mseal(ptr, 0, MM_SEAL_MPROTECT); + assert(!ret); + + // verify the 4 pages are not sealed by previous call. + ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_twice(void) +{ + LOG_TEST_ENTER(); + int ret; + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + + setup_single_address(size, &ptr); + + ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT); + assert(!ret); + + // apply the same seal will be OK. idempotent. + ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT); + assert(!ret); + + ret = sys_mseal(ptr, size, + MM_SEAL_MPROTECT | MM_SEAL_MMAP | MM_SEAL_MREMAP | + MM_SEAL_MSEAL); + assert(!ret); + + ret = sys_mseal(ptr, size, + MM_SEAL_MPROTECT | MM_SEAL_MMAP | MM_SEAL_MREMAP | + MM_SEAL_MSEAL); + assert(!ret); + + ret = sys_mseal(ptr, size, MM_SEAL_MSEAL); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + if (seal) + seal_mprotect_single_address(ptr, size); + + ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_start_mprotect(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + if (seal) + seal_mprotect_single_address(ptr, page_size); + + // the first page is sealed. + ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + // pages after the first page is not sealed. + ret = sys_mprotect(ptr + page_size, page_size * 3, + PROT_READ | PROT_WRITE); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_end_mprotect(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + if (seal) + seal_mprotect_single_address(ptr + page_size, 3 * page_size); + + /* first page is not sealed */ + ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE); + assert(!ret); + + /* last 3 page are sealed */ + ret = sys_mprotect(ptr + page_size, page_size * 3, + PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect_unalign_len(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + if (seal) + seal_mprotect_single_address(ptr, page_size * 2 - 1); + + // 2 pages are sealed. + ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + ret = sys_mprotect(ptr + page_size * 2, page_size, + PROT_READ | PROT_WRITE); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect_unalign_len_variant_2(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + if (seal) + seal_mprotect_single_address(ptr, page_size * 2 + 1); + + // 3 pages are sealed. + ret = sys_mprotect(ptr, page_size * 3, PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + ret = sys_mprotect(ptr + page_size * 3, page_size, + PROT_READ | PROT_WRITE); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect_two_vma(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + /* use mprotect to split */ + ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE); + assert(!ret); + + if (seal) + seal_mprotect_single_address(ptr, page_size * 4); + + ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + ret = sys_mprotect(ptr + page_size * 2, page_size * 2, + PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect_two_vma_with_split(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + // use mprotect to split as two vma. + ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE); + assert(!ret); + + // mseal can apply across 2 vma, also split them. + if (seal) + seal_mprotect_single_address(ptr + page_size, page_size * 2); + + // the first page is not sealed. + ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE); + assert(!ret); + + // the second page is sealed. + ret = sys_mprotect(ptr + page_size, page_size, PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + // the third page is sealed. + ret = sys_mprotect(ptr + 2 * page_size, page_size, + PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + // the fouth page is not sealed. + ret = sys_mprotect(ptr + 3 * page_size, page_size, + PROT_READ | PROT_WRITE); + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect_partial_mprotect(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + // seal one page. + if (seal) + seal_mprotect_single_address(ptr, page_size); + + // mprotect first 2 page will fail, since the first page are sealed. + ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE); + if (seal) + assert(ret < 0); + else + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect_two_vma_with_gap(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + // use mprotect to split. + ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE); + assert(!ret); + + // use mprotect to split. + ret = sys_mprotect(ptr + 3 * page_size, page_size, + PROT_READ | PROT_WRITE); + assert(!ret); + + // use munmap to free two pages in the middle + ret = sys_munmap(ptr + page_size, 2 * page_size); + assert(!ret); + + // mprotect will fail, because there is a gap in the address. + // notes, internally mprotect still updated the first page. + ret = sys_mprotect(ptr, 4 * page_size, PROT_READ); + assert(ret < 0); + + // mseal will fail as well. + ret = sys_mseal(ptr, 4 * page_size, MM_SEAL_MPROTECT); + assert(ret < 0); + + // unlike mprotect, the first page is not sealed. + ret = sys_mprotect(ptr, page_size, PROT_READ); + assert(ret == 0); + + // the last page is not sealed. + ret = sys_mprotect(ptr + 3 * page_size, page_size, PROT_READ); + assert(ret == 0); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect_split(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + //use mprotect to split. + ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE); + assert(!ret); + + //seal all 4 pages. + if (seal) { + ret = sys_mseal(ptr, 4 * page_size, MM_SEAL_MPROTECT); + assert(!ret); + } + + //madvice is OK. + ret = sys_madvise(ptr, page_size * 2, MADV_WILLNEED); + assert(!ret); + + //mprotect is sealed. + ret = sys_mprotect(ptr, 2 * page_size, PROT_READ); + if (seal) + assert(ret < 0); + else + assert(!ret); + + + ret = sys_mprotect(ptr + 2 * page_size, 2 * page_size, PROT_READ); + if (seal) + assert(ret < 0); + else + assert(!ret); + + clean_single_address(ptr, size); +} + +static void test_seal_mprotect_merge(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + // use mprotect to split one page. + ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE); + assert(!ret); + + // seal first two pages. + if (seal) { + ret = sys_mseal(ptr, 2 * page_size, MM_SEAL_MPROTECT); + assert(!ret); + } + + ret = sys_madvise(ptr, page_size, MADV_WILLNEED); + assert(!ret); + + // 2 pages are sealed. + ret = sys_mprotect(ptr, 2 * page_size, PROT_READ); + if (seal) + assert(ret < 0); + else + assert(!ret); + + // last 2 pages are not sealed. + ret = sys_mprotect(ptr + 2 * page_size, 2 * page_size, PROT_READ); + assert(ret == 0); + + clean_single_address(ptr, size); +} + +static void test_seal_munmap(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MUNMAP); + assert(!ret); + } + + // 4 pages are sealed. + ret = sys_munmap(ptr, size); + if (seal) + assert(ret < 0); + else + assert(!ret); +} + +/* + * allocate 4 pages, + * use mprotect to split it as two VMAs + * seal the whole range + * munmap will fail on both + */ +static void test_seal_munmap_two_vma(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + /* use mprotect to split */ + ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE); + assert(!ret); + + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MUNMAP); + assert(!ret); + } + + ret = sys_munmap(ptr, page_size * 2); + if (seal) + assert(ret < 0); + else + assert(!ret); + + ret = sys_munmap(ptr + page_size, page_size * 2); + if (seal) + assert(ret < 0); + else + assert(!ret); +} + +/* + * allocate a VMA with 4 pages. + * munmap the middle 2 pages. + * seal the whole 4 pages, will fail. + * note: one of the pages are sealed + * munmap the first page will be OK. + * munmap the last page will be OK. + */ +static void test_seal_munmap_vma_with_gap(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + ret = sys_munmap(ptr + page_size, page_size * 2); + assert(!ret); + + if (seal) { + // can't have gap in the middle. + ret = sys_mseal(ptr, size, MM_SEAL_MUNMAP); + assert(ret < 0); + } + + ret = sys_munmap(ptr, page_size); + assert(!ret); + + ret = sys_munmap(ptr + page_size * 2, page_size); + assert(!ret); + + ret = sys_munmap(ptr, size); + assert(!ret); +} + +static void test_munmap_start_freed(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + + // unmap the first page. + ret = sys_munmap(ptr, page_size); + assert(!ret); + + // seal the last 3 pages. + if (seal) { + ret = sys_mseal(ptr + page_size, 3 * page_size, MM_SEAL_MUNMAP); + assert(!ret); + } + + // unmap from the first page. + ret = sys_munmap(ptr, size); + if (seal) { + assert(ret < 0); + + // use mprotect to verify page is not unmapped. + ret = sys_mprotect(ptr + page_size, 3 * page_size, PROT_READ); + assert(!ret); + } else + // note: this will be OK, even the first page is + // already unmapped. + assert(!ret); +} + +static void test_munmap_end_freed(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + // unmap last page. + ret = sys_munmap(ptr + page_size * 3, page_size); + assert(!ret); + + // seal the first 3 pages. + if (seal) { + ret = sys_mseal(ptr, 3 * page_size, MM_SEAL_MUNMAP); + assert(!ret); + } + + // unmap all pages. + ret = sys_munmap(ptr, size); + if (seal) { + assert(ret < 0); + + // use mprotect to verify page is not unmapped. + ret = sys_mprotect(ptr, 3 * page_size, PROT_READ); + assert(!ret); + } else + assert(!ret); +} + +static void test_munmap_middle_freed(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + + setup_single_address(size, &ptr); + // unmap 2 pages in the middle. + ret = sys_munmap(ptr + page_size, page_size * 2); + assert(!ret); + + // seal the first page. + if (seal) { + ret = sys_mseal(ptr, page_size, MM_SEAL_MUNMAP); + assert(!ret); + } + + // munmap all 4 pages. + ret = sys_munmap(ptr, size); + if (seal) { + assert(ret < 0); + + // use mprotect to verify page is not unmapped. + ret = sys_mprotect(ptr, page_size, PROT_READ); + assert(!ret); + } else + assert(!ret); +} + +void test_seal_mremap_shrink(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MREMAP); + assert(!ret); + } + + // shrink from 4 pages to 2 pages. + ret2 = mremap(ptr, size, 2 * page_size, 0, 0); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else { + assert(ret2 != MAP_FAILED); + clean_single_address(ret2, 2 * page_size); + } + clean_single_address(ptr, size); +} + +void test_seal_mremap_expand(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + // ummap last 2 pages. + ret = sys_munmap(ptr + 2 * page_size, 2 * page_size); + assert(!ret); + + if (seal) { + ret = sys_mseal(ptr, 2 * page_size, MM_SEAL_MREMAP); + assert(!ret); + } + + // expand from 2 page to 4 pages. + ret2 = mremap(ptr, 2 * page_size, 4 * page_size, 0, 0); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else { + assert(ret2 == ptr); + clean_single_address(ret2, 4 * page_size); + } + clean_single_address(ptr, size); +} + +void test_seal_mremap_move(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MREMAP); + assert(!ret); + } + + // move from ptr to fixed address. + ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, addr1); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else { + assert(ret2 != MAP_FAILED); + clean_single_address(ret2, size); + } + clean_single_address(ptr, size); +} + +void test_seal_mmap_overwrite_prot(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + unsigned long page_size = getpagesize(); + unsigned long size = page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MMAP); + assert(!ret); + } + + // use mmap to change protection. + ret2 = mmap(ptr, size, PROT_NONE, + MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else + assert(ret2 == ptr); + + clean_single_address(ptr, size); +} + +void test_seal_mremap_shrink_fixed(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + void *newAddr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + setup_single_fixed_address(size, &newAddr); + + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MREMAP); + assert(!ret); + } + + // mremap to move and shrink to fixed address + ret2 = mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED, + newAddr); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else + assert(ret2 == newAddr); + + clean_single_address(ptr, size); + clean_single_address(newAddr, size); +} + +void test_seal_mremap_expand_fixed(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + void *newAddr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + void *ret2; + + setup_single_address(page_size, &ptr); + setup_single_fixed_address(size, &newAddr); + + if (seal) { + ret = sys_mseal(newAddr, size, MM_SEAL_MREMAP); + assert(!ret); + } + + // mremap to move and expand to fixed address + ret2 = mremap(ptr, page_size, size, MREMAP_MAYMOVE | MREMAP_FIXED, + newAddr); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else + assert(ret2 == newAddr); + + clean_single_address(ptr, page_size); + clean_single_address(newAddr, size); +} + +void test_seal_mremap_move_fixed(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + void *newAddr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + setup_single_fixed_address(size, &newAddr); + + if (seal) { + ret = sys_mseal(newAddr, size, MM_SEAL_MREMAP); + assert(!ret); + } + + // mremap to move to fixed address + ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else + assert(ret2 == newAddr); + + clean_single_address(ptr, page_size); + clean_single_address(newAddr, size); +} + +void test_seal_mremap_move_fixed_zero(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + void *newAddr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MREMAP); + assert(!ret); + } + + /* + * MREMAP_FIXED can move the mapping to zero address + */ + ret2 = mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED, + 0); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else { + assert(ret2 == 0); + clean_single_address(ret2, 2 * page_size); + } + clean_single_address(ptr, size); +} + +void test_seal_mremap_move_dontunmap(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + void *newAddr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MREMAP); + assert(!ret); + } + + // mremap to move, and don't unmap src addr. + ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, 0); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else { + assert(ret2 != MAP_FAILED); + clean_single_address(ret2, size); + } + + clean_single_address(ptr, page_size); +} + +void test_seal_mremap_move_dontunmap_anyaddr(bool seal) +{ + LOG_TEST_ENTER(); + void *ptr; + void *newAddr; + unsigned long page_size = getpagesize(); + unsigned long size = 4 * page_size; + int ret; + void *ret2; + + setup_single_address(size, &ptr); + + if (seal) { + ret = sys_mseal(ptr, size, MM_SEAL_MREMAP); + assert(!ret); + } + + /* + * The 0xdeaddead should not have effect on dest addr + * when MREMAP_DONTUNMAP is set. + */ + ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, + 0xdeaddead); + if (seal) { + assert(ret2 == MAP_FAILED); + assert(errno == EACCES); + } else { + assert(ret2 != MAP_FAILED); + assert((long)ret2 != 0xdeaddead); + clean_single_address(ret2, size); + } + + clean_single_address(ptr, page_size); +} + +int main(int argc, char **argv) +{ + test_seal_invalid_input(); + test_seal_addseals(); + test_seal_addseals_combined(); + test_seal_addseals_reject(); + test_seal_unmapped_start(); + test_seal_unmapped_middle(); + test_seal_unmapped_end(); + test_seal_multiple_vmas(); + test_seal_split_start(); + test_seal_split_end(); + + test_seal_zero_length(); + test_seal_twice(); + + test_seal_mprotect(false); + test_seal_mprotect(true); + + test_seal_start_mprotect(false); + test_seal_start_mprotect(true); + + test_seal_end_mprotect(false); + test_seal_end_mprotect(true); + + test_seal_mprotect_unalign_len(false); + test_seal_mprotect_unalign_len(true); + + test_seal_mprotect_unalign_len_variant_2(false); + test_seal_mprotect_unalign_len_variant_2(true); + + test_seal_mprotect_two_vma(false); + test_seal_mprotect_two_vma(true); + + test_seal_mprotect_two_vma_with_split(false); + test_seal_mprotect_two_vma_with_split(true); + + test_seal_mprotect_partial_mprotect(false); + test_seal_mprotect_partial_mprotect(true); + + test_seal_mprotect_two_vma_with_gap(false); + test_seal_mprotect_two_vma_with_gap(true); + + test_seal_mprotect_merge(false); + test_seal_mprotect_merge(true); + + test_seal_mprotect_split(false); + test_seal_mprotect_split(true); + + test_seal_munmap(false); + test_seal_munmap(true); + test_seal_munmap_two_vma(false); + test_seal_munmap_two_vma(true); + test_seal_munmap_vma_with_gap(false); + test_seal_munmap_vma_with_gap(true); + + test_munmap_start_freed(false); + test_munmap_start_freed(true); + test_munmap_middle_freed(false); + test_munmap_middle_freed(true); + test_munmap_end_freed(false); + test_munmap_end_freed(true); + + test_seal_mremap_shrink(false); + test_seal_mremap_shrink(true); + test_seal_mremap_expand(false); + test_seal_mremap_expand(true); + test_seal_mremap_move(false); + test_seal_mremap_move(true); + + test_seal_mremap_shrink_fixed(false); + test_seal_mremap_shrink_fixed(true); + test_seal_mremap_expand_fixed(false); + test_seal_mremap_expand_fixed(true); + test_seal_mremap_move_fixed(false); + test_seal_mremap_move_fixed(true); + test_seal_mremap_move_dontunmap(false); + test_seal_mremap_move_dontunmap(true); + test_seal_mremap_move_fixed_zero(false); + test_seal_mremap_move_fixed_zero(true); + test_seal_mremap_move_dontunmap_anyaddr(false); + test_seal_mremap_move_dontunmap_anyaddr(true); + + test_seal_mmap_overwrite_prot(false); + test_seal_mmap_overwrite_prot(true); + + printf("OK\n"); + return 0; +} -- 2.42.0.609.gbb76f46606-goog