1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2020 ARM Limited
16 #include "kselftest.h"
17 #include "mte_common_util.h"
20 static size_t page_sz;
22 static int check_usermem_access_fault(int mem_type, int mode, int mapping)
31 mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
32 fd = create_temp_file();
35 for (i = 0; i < len; i++)
36 write(fd, &val, sizeof(val));
38 ptr = mte_allocate_memory(len, mem_type, mapping, true);
39 if (check_allocated_memory(ptr, len, mem_type, true) != KSFT_PASS) {
43 mte_initialize_current_context(mode, (uintptr_t)ptr, len);
44 /* Copy from file into buffer with valid tag */
45 read_len = read(fd, ptr, len);
46 mte_wait_after_trig();
47 if (cur_mte_cxt.fault_valid || read_len < len)
49 /* Verify same pattern is read */
50 for (i = 0; i < len; i++)
51 if (*(char *)(ptr + i) != val)
56 /* Tag the next half of memory with different value */
57 ptr_next = (void *)((unsigned long)ptr + page_sz);
58 ptr_next = mte_insert_new_tag(ptr_next);
59 mte_set_tag_address_range(ptr_next, page_sz);
62 /* Copy from file into buffer with invalid tag */
63 read_len = read(fd, ptr, len);
64 mte_wait_after_trig();
66 * Accessing user memory in kernel with invalid tag should fail in sync
67 * mode without fault but may not fail in async mode as per the
68 * implemented MTE userspace support in Arm64 kernel.
70 if (mode == MTE_SYNC_ERR &&
71 !cur_mte_cxt.fault_valid && read_len < len) {
73 } else if (mode == MTE_ASYNC_ERR &&
74 !cur_mte_cxt.fault_valid && read_len == len) {
78 mte_free_memory((void *)ptr, len, mem_type, true);
83 int main(int argc, char *argv[])
87 page_sz = getpagesize();
89 ksft_print_msg("ERR: Unable to get page size\n");
92 err = mte_default_setup();
95 /* Register signal handlers */
96 mte_register_signal(SIGSEGV, mte_default_handler);
98 evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
99 "Check memory access from kernel in sync mode, private mapping and mmap memory\n");
100 evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
101 "Check memory access from kernel in sync mode, shared mapping and mmap memory\n");
103 evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
104 "Check memory access from kernel in async mode, private mapping and mmap memory\n");
105 evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
106 "Check memory access from kernel in async mode, shared mapping and mmap memory\n");
110 return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;