1*aca3beaaSApple OSS Distributions #include <darwintest.h> 2*aca3beaaSApple OSS Distributions #include <fcntl.h> 3*aca3beaaSApple OSS Distributions #include <sys/mman.h> 4*aca3beaaSApple OSS Distributions #include <darwintest_utils.h> 5*aca3beaaSApple OSS Distributions #include <mach/vm_page_size.h> 6*aca3beaaSApple OSS Distributions 7*aca3beaaSApple OSS Distributions /** Verify that F_ADDSIGS does not page fault off the end of the user blob 8*aca3beaaSApple OSS Distributions * 1. Find VA space for 3 pages 9*aca3beaaSApple OSS Distributions * 2. Unmap the last page 10*aca3beaaSApple OSS Distributions * 3. Start fs_blob_start at PAGE_SIZE + 1 bytes away from the end of the 11*aca3beaaSApple OSS Distributions * VA region (such that any read of more than PAGE_SIZE + 1 bytes will fault) 12*aca3beaaSApple OSS Distributions * 4. Call fcntl with the arguments and verify the output is not EFAULT 13*aca3beaaSApple OSS Distributions */ 14*aca3beaaSApple OSS Distributions T_DECL(fcntl_addsig, "Verify that fcntl(F_ADDSIGS) doesn't EFAULT", T_META_NAMESPACE("xnu.vfs")) { 15*aca3beaaSApple OSS Distributions void* blob_space = mmap(NULL, vm_page_size * 3, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); 16*aca3beaaSApple OSS Distributions T_ASSERT_NE(blob_space, MAP_FAILED, "Blob Region: %p [%zd]", blob_space, vm_page_size); 17*aca3beaaSApple OSS Distributions 18*aca3beaaSApple OSS Distributions T_ASSERT_POSIX_SUCCESS(munmap((char*)blob_space + (vm_page_size * 2), vm_page_size), NULL); 19*aca3beaaSApple OSS Distributions 20*aca3beaaSApple OSS Distributions size_t blob_size = vm_page_size + 1; 21*aca3beaaSApple OSS Distributions char* blob_start = ((char*)blob_space) + (vm_page_size * 2) - blob_size; 22*aca3beaaSApple OSS Distributions fsignatures_t args = { .fs_file_start = 0, .fs_blob_start = blob_start, .fs_blob_size = blob_size}; 23*aca3beaaSApple OSS Distributions 24*aca3beaaSApple OSS Distributions // Create test file to operate on 25*aca3beaaSApple OSS Distributions const char * tmp_dir = dt_tmpdir(); 26*aca3beaaSApple OSS Distributions char tmp_file_name[PATH_MAX]; 27*aca3beaaSApple OSS Distributions sprintf(tmp_file_name, "%s/foo", tmp_dir); 28*aca3beaaSApple OSS Distributions FILE* tmp_file = fopen(tmp_file_name, "wx"); 29*aca3beaaSApple OSS Distributions fprintf(tmp_file, "Just some random content"); 30*aca3beaaSApple OSS Distributions fclose(tmp_file); 31*aca3beaaSApple OSS Distributions 32*aca3beaaSApple OSS Distributions int fd = open(tmp_file_name, O_RDONLY); 33*aca3beaaSApple OSS Distributions T_ASSERT_POSIX_SUCCESS(fd, "tmp file: %s", tmp_file_name); 34*aca3beaaSApple OSS Distributions 35*aca3beaaSApple OSS Distributions // This command will fail, but should not fail with EFAULT 36*aca3beaaSApple OSS Distributions int result = fcntl(fd, F_ADDSIGS, &args); 37*aca3beaaSApple OSS Distributions int error = errno; 38*aca3beaaSApple OSS Distributions T_QUIET; T_EXPECT_EQ(result, -1, NULL); 39*aca3beaaSApple OSS Distributions // EBADEXEC is expected, but not required for success of this test 40*aca3beaaSApple OSS Distributions T_EXPECT_NE(error, EFAULT, "fcntl: %d (%d:%s)", result, error, strerror(error)); 41*aca3beaaSApple OSS Distributions } 42