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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2020 ARM Limited
#define _GNU_SOURCE
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ucontext.h>
#include <sys/wait.h>
#include "kselftest.h"
#include "mte_common_util.h"
#include "mte_def.h"
#define BUFFER_SIZE (5 * MT_GRANULE_SIZE)
#define RUNS (MT_TAG_COUNT)
#define UNDERFLOW MT_GRANULE_SIZE
#define OVERFLOW MT_GRANULE_SIZE
static size_t page_size;
static int sizes[] = {
1, 537, 989, 1269, MT_GRANULE_SIZE - 1, MT_GRANULE_SIZE,
/* page size - 1*/ 0, /* page_size */ 0, /* page size + 1 */ 0
};
static int check_child_tag_inheritance(char *ptr, int size, int mode)
{
int i, parent_tag, child_tag, fault, child_status;
pid_t child;
parent_tag = MT_FETCH_TAG((uintptr_t)ptr);
fault = 0;
child = fork();
if (child == -1) {
ksft_print_msg("FAIL: child process creation\n");
return KSFT_FAIL;
} else if (child == 0) {
mte_initialize_current_context(mode, (uintptr_t)ptr, size);
/* Do copy on write */
memset(ptr, '1', size);
mte_wait_after_trig();
if (cur_mte_cxt.fault_valid == true) {
fault = 1;
goto check_child_tag_inheritance_err;
}
for (i = 0 ; i < size ; i += MT_GRANULE_SIZE) {
child_tag = MT_FETCH_TAG((uintptr_t)(mte_get_tag_address(ptr + i)));
if (parent_tag != child_tag) {
ksft_print_msg("FAIL: child mte tag mismatch\n");
fault = 1;
goto check_child_tag_inheritance_err;
}
}
mte_initialize_current_context(mode, (uintptr_t)ptr, -UNDERFLOW);
memset(ptr - UNDERFLOW, '2', UNDERFLOW);
mte_wait_after_trig();
if (cur_mte_cxt.fault_valid == false) {
fault = 1;
goto check_child_tag_inheritance_err;
}
mte_initialize_current_context(mode, (uintptr_t)ptr, size + OVERFLOW);
memset(ptr + size, '3', OVERFLOW);
mte_wait_after_trig();
if (cur_mte_cxt.fault_valid == false) {
fault = 1;
goto check_child_tag_inheritance_err;
}
check_child_tag_inheritance_err:
_exit(fault);
}
/* Wait for child process to terminate */
wait(&child_status);
if (WIFEXITED(child_status))
fault = WEXITSTATUS(child_status);
else
fault = 1;
return (fault) ? KSFT_FAIL : KSFT_PASS;
}
static int check_child_memory_mapping(int mem_type, int mode, int mapping)
{
char *ptr;
int run, result;
int item = ARRAY_SIZE(sizes);
item = ARRAY_SIZE(sizes);
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
for (run = 0; run < item; run++) {
ptr = (char *)mte_allocate_memory_tag_range(sizes[run], mem_type, mapping,
UNDERFLOW, OVERFLOW);
if (check_allocated_memory_range(ptr, sizes[run], mem_type,
UNDERFLOW, OVERFLOW) != KSFT_PASS)
return KSFT_FAIL;
result = check_child_tag_inheritance(ptr, sizes[run], mode);
mte_free_memory_tag_range((void *)ptr, sizes[run], mem_type, UNDERFLOW, OVERFLOW);
if (result == KSFT_FAIL)
return result;
}
return KSFT_PASS;
}
static int check_child_file_mapping(int mem_type, int mode, int mapping)
{
char *ptr, *map_ptr;
int run, fd, map_size, result = KSFT_PASS;
int total = ARRAY_SIZE(sizes);
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
for (run = 0; run < total; run++) {
fd = create_temp_file();
if (fd == -1)
return KSFT_FAIL;
map_size = sizes[run] + OVERFLOW + UNDERFLOW;
map_ptr = (char *)mte_allocate_file_memory(map_size, mem_type, mapping, false, fd);
if (check_allocated_memory(map_ptr, map_size, mem_type, false) != KSFT_PASS) {
close(fd);
return KSFT_FAIL;
}
ptr = map_ptr + UNDERFLOW;
mte_initialize_current_context(mode, (uintptr_t)ptr, sizes[run]);
/* Only mte enabled memory will allow tag insertion */
ptr = mte_insert_tags((void *)ptr, sizes[run]);
if (!ptr || cur_mte_cxt.fault_valid == true) {
ksft_print_msg("FAIL: Insert tags on file based memory\n");
munmap((void *)map_ptr, map_size);
close(fd);
return KSFT_FAIL;
}
result = check_child_tag_inheritance(ptr, sizes[run], mode);
mte_clear_tags((void *)ptr, sizes[run]);
munmap((void *)map_ptr, map_size);
close(fd);
if (result != KSFT_PASS)
return KSFT_FAIL;
}
return KSFT_PASS;
}
int main(int argc, char *argv[])
{
int err;
int item = ARRAY_SIZE(sizes);
page_size = getpagesize();
if (!page_size) {
ksft_print_msg("ERR: Unable to get page size\n");
return KSFT_FAIL;
}
sizes[item - 3] = page_size - 1;
sizes[item - 2] = page_size;
sizes[item - 1] = page_size + 1;
err = mte_default_setup();
if (err)
return err;
/* Register SIGSEGV handler */
mte_register_signal(SIGSEGV, mte_default_handler);
mte_register_signal(SIGBUS, mte_default_handler);
/* Set test plan */
ksft_set_plan(12);
evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
"Check child anonymous memory with private mapping, precise mode and mmap memory\n");
evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
"Check child anonymous memory with shared mapping, precise mode and mmap memory\n");
evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
"Check child anonymous memory with private mapping, imprecise mode and mmap memory\n");
evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
"Check child anonymous memory with shared mapping, imprecise mode and mmap memory\n");
evaluate_test(check_child_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE),
"Check child anonymous memory with private mapping, precise mode and mmap/mprotect memory\n");
evaluate_test(check_child_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_SHARED),
"Check child anonymous memory with shared mapping, precise mode and mmap/mprotect memory\n");
evaluate_test(check_child_file_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
"Check child file memory with private mapping, precise mode and mmap memory\n");
evaluate_test(check_child_file_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
"Check child file memory with shared mapping, precise mode and mmap memory\n");
evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
"Check child file memory with private mapping, imprecise mode and mmap memory\n");
evaluate_test(check_child_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
"Check child file memory with shared mapping, imprecise mode and mmap memory\n");
evaluate_test(check_child_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE),
"Check child file memory with private mapping, precise mode and mmap/mprotect memory\n");
evaluate_test(check_child_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_SHARED),
"Check child file memory with shared mapping, precise mode and mmap/mprotect memory\n");
mte_restore_setup();
ksft_print_cnts();
return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
}
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