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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2024 Ampere Computing LLC
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ucontext.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "kselftest.h"
#include "mte_common_util.h"
#include "mte_def.h"
#define TAG_CHECK_ON 0
#define TAG_CHECK_OFF 1
static unsigned long default_huge_page_size(void)
{
unsigned long hps = 0;
char *line = NULL;
size_t linelen = 0;
FILE *f = fopen("/proc/meminfo", "r");
if (!f)
return 0;
while (getline(&line, &linelen, f) > 0) {
if (sscanf(line, "Hugepagesize: %lu kB", &hps) == 1) {
hps <<= 10;
break;
}
}
free(line);
fclose(f);
return hps;
}
static bool is_hugetlb_allocated(void)
{
unsigned long hps = 0;
char *line = NULL;
size_t linelen = 0;
FILE *f = fopen("/proc/meminfo", "r");
if (!f)
return false;
while (getline(&line, &linelen, f) > 0) {
if (sscanf(line, "Hugetlb: %lu kB", &hps) == 1) {
hps <<= 10;
break;
}
}
free(line);
fclose(f);
if (hps > 0)
return true;
return false;
}
static void write_sysfs(char *str, unsigned long val)
{
FILE *f;
f = fopen(str, "w");
if (!f) {
ksft_print_msg("ERR: missing %s\n", str);
return;
}
fprintf(f, "%lu", val);
fclose(f);
}
static void allocate_hugetlb()
{
write_sysfs("/proc/sys/vm/nr_hugepages", 2);
}
static void free_hugetlb()
{
write_sysfs("/proc/sys/vm/nr_hugepages", 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 (%d) mismatch\n", i);
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_mte_memory(char *ptr, int size, int mode, int tag_check)
{
mte_initialize_current_context(mode, (uintptr_t)ptr, size);
memset(ptr, '1', size);
mte_wait_after_trig();
if (cur_mte_cxt.fault_valid == true)
return KSFT_FAIL;
return KSFT_PASS;
}
static int check_hugetlb_memory_mapping(int mem_type, int mode, int mapping, int tag_check)
{
char *ptr, *map_ptr;
int result;
unsigned long map_size;
map_size = default_huge_page_size();
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
map_ptr = (char *)mte_allocate_memory(map_size, mem_type, mapping, false);
if (check_allocated_memory(map_ptr, map_size, mem_type, false) != KSFT_PASS)
return KSFT_FAIL;
mte_initialize_current_context(mode, (uintptr_t)map_ptr, map_size);
/* Only mte enabled memory will allow tag insertion */
ptr = mte_insert_tags((void *)map_ptr, map_size);
if (!ptr || cur_mte_cxt.fault_valid == true) {
ksft_print_msg("FAIL: Insert tags on anonymous mmap memory\n");
munmap((void *)map_ptr, map_size);
return KSFT_FAIL;
}
result = check_mte_memory(ptr, map_size, mode, tag_check);
mte_clear_tags((void *)ptr, map_size);
mte_free_memory((void *)map_ptr, map_size, mem_type, false);
if (result == KSFT_FAIL)
return KSFT_FAIL;
return KSFT_PASS;
}
static int check_clear_prot_mte_flag(int mem_type, int mode, int mapping)
{
char *map_ptr;
int prot_flag, result;
unsigned long map_size;
prot_flag = PROT_READ | PROT_WRITE;
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
map_size = default_huge_page_size();
map_ptr = (char *)mte_allocate_memory_tag_range(map_size, mem_type, mapping,
0, 0);
if (check_allocated_memory_range(map_ptr, map_size, mem_type,
0, 0) != KSFT_PASS)
return KSFT_FAIL;
/* Try to clear PROT_MTE property and verify it by tag checking */
if (mprotect(map_ptr, map_size, prot_flag)) {
mte_free_memory_tag_range((void *)map_ptr, map_size, mem_type,
0, 0);
ksft_print_msg("FAIL: mprotect not ignoring clear PROT_MTE property\n");
return KSFT_FAIL;
}
result = check_mte_memory(map_ptr, map_size, mode, TAG_CHECK_ON);
mte_free_memory_tag_range((void *)map_ptr, map_size, mem_type, 0, 0);
if (result != KSFT_PASS)
return KSFT_FAIL;
return KSFT_PASS;
}
static int check_child_hugetlb_memory_mapping(int mem_type, int mode, int mapping)
{
char *ptr;
int result;
unsigned long map_size;
map_size = default_huge_page_size();
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
ptr = (char *)mte_allocate_memory_tag_range(map_size, mem_type, mapping,
0, 0);
if (check_allocated_memory_range(ptr, map_size, mem_type,
0, 0) != KSFT_PASS)
return KSFT_FAIL;
result = check_child_tag_inheritance(ptr, map_size, mode);
mte_free_memory_tag_range((void *)ptr, map_size, mem_type, 0, 0);
if (result == KSFT_FAIL)
return result;
return KSFT_PASS;
}
int main(int argc, char *argv[])
{
int err;
err = mte_default_setup();
if (err)
return err;
/* Register signal handlers */
mte_register_signal(SIGBUS, mte_default_handler);
mte_register_signal(SIGSEGV, mte_default_handler);
allocate_hugetlb();
if (!is_hugetlb_allocated()) {
ksft_print_msg("ERR: Unable allocate hugetlb pages\n");
return KSFT_FAIL;
}
/* Set test plan */
ksft_set_plan(12);
mte_enable_pstate_tco();
evaluate_test(check_hugetlb_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE | MAP_HUGETLB, TAG_CHECK_OFF),
"Check hugetlb memory with private mapping, sync error mode, mmap memory and tag check off\n");
mte_disable_pstate_tco();
evaluate_test(check_hugetlb_memory_mapping(USE_MMAP, MTE_NONE_ERR, MAP_PRIVATE | MAP_HUGETLB, TAG_CHECK_OFF),
"Check hugetlb memory with private mapping, no error mode, mmap memory and tag check off\n");
evaluate_test(check_hugetlb_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE | MAP_HUGETLB, TAG_CHECK_ON),
"Check hugetlb memory with private mapping, sync error mode, mmap memory and tag check on\n");
evaluate_test(check_hugetlb_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE | MAP_HUGETLB, TAG_CHECK_ON),
"Check hugetlb memory with private mapping, sync error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_hugetlb_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE | MAP_HUGETLB, TAG_CHECK_ON),
"Check hugetlb memory with private mapping, async error mode, mmap memory and tag check on\n");
evaluate_test(check_hugetlb_memory_mapping(USE_MPROTECT, MTE_ASYNC_ERR, MAP_PRIVATE | MAP_HUGETLB, TAG_CHECK_ON),
"Check hugetlb memory with private mapping, async error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_clear_prot_mte_flag(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE | MAP_HUGETLB),
"Check clear PROT_MTE flags with private mapping, sync error mode and mmap memory\n");
evaluate_test(check_clear_prot_mte_flag(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE | MAP_HUGETLB),
"Check clear PROT_MTE flags with private mapping and sync error mode and mmap/mprotect memory\n");
evaluate_test(check_child_hugetlb_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE | MAP_HUGETLB),
"Check child hugetlb memory with private mapping, precise mode and mmap memory\n");
evaluate_test(check_child_hugetlb_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE | MAP_HUGETLB),
"Check child hugetlb memory with private mapping, precise mode and mmap memory\n");
evaluate_test(check_child_hugetlb_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE | MAP_HUGETLB),
"Check child hugetlb memory with private mapping, precise mode and mmap/mprotect memory\n");
evaluate_test(check_child_hugetlb_memory_mapping(USE_MPROTECT, MTE_ASYNC_ERR, MAP_PRIVATE | MAP_HUGETLB),
"Check child hugetlb memory with private mapping, precise mode and mmap/mprotect memory\n");
mte_restore_setup();
free_hugetlb();
ksft_print_cnts();
return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
}
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