// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2020 ARM Limited
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ucontext.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include "kselftest.h"
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#include "mte_common_util.h"
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#include "mte_def.h"
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static size_t page_sz;
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static int check_usermem_access_fault(int mem_type, int mode, int mapping)
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{
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int fd, i, err;
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char val = 'A';
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size_t len, read_len;
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void *ptr, *ptr_next;
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err = KSFT_FAIL;
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len = 2 * page_sz;
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mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
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fd = create_temp_file();
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if (fd == -1)
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return KSFT_FAIL;
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for (i = 0; i < len; i++)
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write(fd, &val, sizeof(val));
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lseek(fd, 0, 0);
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ptr = mte_allocate_memory(len, mem_type, mapping, true);
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if (check_allocated_memory(ptr, len, mem_type, true) != KSFT_PASS) {
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close(fd);
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return KSFT_FAIL;
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}
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mte_initialize_current_context(mode, (uintptr_t)ptr, len);
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/* Copy from file into buffer with valid tag */
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read_len = read(fd, ptr, len);
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mte_wait_after_trig();
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if (cur_mte_cxt.fault_valid || read_len < len)
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goto usermem_acc_err;
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/* Verify same pattern is read */
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for (i = 0; i < len; i++)
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if (*(char *)(ptr + i) != val)
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break;
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if (i < len)
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goto usermem_acc_err;
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/* Tag the next half of memory with different value */
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ptr_next = (void *)((unsigned long)ptr + page_sz);
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ptr_next = mte_insert_new_tag(ptr_next);
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mte_set_tag_address_range(ptr_next, page_sz);
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lseek(fd, 0, 0);
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/* Copy from file into buffer with invalid tag */
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read_len = read(fd, ptr, len);
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mte_wait_after_trig();
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/*
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* Accessing user memory in kernel with invalid tag should fail in sync
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* mode without fault but may not fail in async mode as per the
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* implemented MTE userspace support in Arm64 kernel.
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*/
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if (mode == MTE_SYNC_ERR &&
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!cur_mte_cxt.fault_valid && read_len < len) {
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err = KSFT_PASS;
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} else if (mode == MTE_ASYNC_ERR &&
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!cur_mte_cxt.fault_valid && read_len == len) {
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err = KSFT_PASS;
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}
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usermem_acc_err:
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mte_free_memory((void *)ptr, len, mem_type, true);
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close(fd);
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return err;
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}
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int main(int argc, char *argv[])
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{
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int err;
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page_sz = getpagesize();
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if (!page_sz) {
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ksft_print_msg("ERR: Unable to get page size\n");
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return KSFT_FAIL;
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}
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err = mte_default_setup();
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if (err)
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return err;
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/* Register signal handlers */
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mte_register_signal(SIGSEGV, mte_default_handler);
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/* Set test plan */
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ksft_set_plan(4);
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evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
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"Check memory access from kernel in sync mode, private mapping and mmap memory\n");
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evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
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"Check memory access from kernel in sync mode, shared mapping and mmap memory\n");
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evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
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"Check memory access from kernel in async mode, private mapping and mmap memory\n");
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evaluate_test(check_usermem_access_fault(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
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"Check memory access from kernel in async mode, shared mapping and mmap memory\n");
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mte_restore_setup();
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ksft_print_cnts();
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return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
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}
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