Commit 53ec81d2 authored by Amit Kachhap's avatar Amit Kachhap Committed by Will Deacon
Browse files

kselftest/arm64: Verify all different mmap MTE options



This testcase checks the different unsupported/supported options for mmap
if used with PROT_MTE memory protection flag. These checks are,

* Either pstate.tco enable or prctl PR_MTE_TCF_NONE option should not cause
  any tag mismatch faults.
* Different combinations of anonymous/file memory mmap, mprotect,
  sync/async error mode and private/shared mappings should work.
* mprotect should not be able to clear the PROT_MTE page property.

Co-developed-by: default avatarGabor Kertesz <gabor.kertesz@arm.com>
Signed-off-by: default avatarGabor Kertesz <gabor.kertesz@arm.com>
Signed-off-by: Amit Kachhap's avatarAmit Daniel Kachhap <amit.kachhap@arm.com>
Tested-by: Catalin Marinas's avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: Catalin Marinas's avatarCatalin Marinas <catalin.marinas@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201002115630.24683-5-amit.kachhap@arm.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent dfe537cf
check_buffer_fill
check_tags_inclusion
check_child_memory
check_mmap_options
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2020 ARM Limited
#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 "kselftest.h"
#include "mte_common_util.h"
#include "mte_def.h"
#define RUNS (MT_TAG_COUNT)
#define UNDERFLOW MT_GRANULE_SIZE
#define OVERFLOW MT_GRANULE_SIZE
#define TAG_CHECK_ON 0
#define TAG_CHECK_OFF 1
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_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;
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 && tag_check == TAG_CHECK_ON)
return KSFT_FAIL;
if (cur_mte_cxt.fault_valid == true && tag_check == TAG_CHECK_OFF)
return KSFT_FAIL;
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 && tag_check == TAG_CHECK_ON)
return KSFT_FAIL;
if (cur_mte_cxt.fault_valid == true && tag_check == TAG_CHECK_OFF)
return KSFT_FAIL;
return KSFT_PASS;
}
static int check_anonymous_memory_mapping(int mem_type, int mode, int mapping, int tag_check)
{
char *ptr, *map_ptr;
int run, result, map_size;
int item = sizeof(sizes)/sizeof(int);
item = sizeof(sizes)/sizeof(int);
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
for (run = 0; run < item; run++) {
map_size = sizes[run] + OVERFLOW + UNDERFLOW;
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;
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 anonymous mmap memory\n");
munmap((void *)map_ptr, map_size);
return KSFT_FAIL;
}
result = check_mte_memory(ptr, sizes[run], mode, tag_check);
mte_clear_tags((void *)ptr, sizes[run]);
mte_free_memory((void *)map_ptr, map_size, mem_type, false);
if (result == KSFT_FAIL)
return KSFT_FAIL;
}
return KSFT_PASS;
}
static int check_file_memory_mapping(int mem_type, int mode, int mapping, int tag_check)
{
char *ptr, *map_ptr;
int run, fd, map_size;
int total = sizeof(sizes)/sizeof(int);
int result = KSFT_PASS;
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] + UNDERFLOW + OVERFLOW;
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_mte_memory(ptr, sizes[run], mode, tag_check);
mte_clear_tags((void *)ptr, sizes[run]);
munmap((void *)map_ptr, map_size);
close(fd);
if (result == KSFT_FAIL)
break;
}
return result;
}
static int check_clear_prot_mte_flag(int mem_type, int mode, int mapping)
{
char *ptr, *map_ptr;
int run, prot_flag, result, fd, map_size;
int total = sizeof(sizes)/sizeof(int);
prot_flag = PROT_READ | PROT_WRITE;
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
for (run = 0; run < total; run++) {
map_size = sizes[run] + OVERFLOW + UNDERFLOW;
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;
map_ptr = ptr - UNDERFLOW;
/* 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 *)ptr, sizes[run], mem_type,
UNDERFLOW, OVERFLOW);
ksft_print_msg("FAIL: mprotect not ignoring clear PROT_MTE property\n");
return KSFT_FAIL;
}
result = check_mte_memory(ptr, sizes[run], mode, TAG_CHECK_ON);
mte_free_memory_tag_range((void *)ptr, sizes[run], mem_type, UNDERFLOW, OVERFLOW);
if (result != KSFT_PASS)
return KSFT_FAIL;
fd = create_temp_file();
if (fd == -1)
return KSFT_FAIL;
ptr = (char *)mte_allocate_file_memory_tag_range(sizes[run], mem_type, mapping,
UNDERFLOW, OVERFLOW, fd);
if (check_allocated_memory_range(ptr, sizes[run], mem_type,
UNDERFLOW, OVERFLOW) != KSFT_PASS) {
close(fd);
return KSFT_FAIL;
}
map_ptr = ptr - UNDERFLOW;
/* Try to clear PROT_MTE property and verify it by tag checking */
if (mprotect(map_ptr, map_size, prot_flag)) {
ksft_print_msg("FAIL: mprotect not ignoring clear PROT_MTE property\n");
mte_free_memory_tag_range((void *)ptr, sizes[run], mem_type,
UNDERFLOW, OVERFLOW);
close(fd);
return KSFT_FAIL;
}
result = check_mte_memory(ptr, sizes[run], mode, TAG_CHECK_ON);
mte_free_memory_tag_range((void *)ptr, sizes[run], mem_type, UNDERFLOW, OVERFLOW);
close(fd);
if (result != KSFT_PASS)
return KSFT_FAIL;
}
return KSFT_PASS;
}
int main(int argc, char *argv[])
{
int err;
int item = sizeof(sizes)/sizeof(int);
err = mte_default_setup();
if (err)
return err;
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;
/* Register signal handlers */
mte_register_signal(SIGBUS, mte_default_handler);
mte_register_signal(SIGSEGV, mte_default_handler);
mte_enable_pstate_tco();
evaluate_test(check_anonymous_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE, TAG_CHECK_OFF),
"Check anonymous memory with private mapping, sync error mode, mmap memory and tag check off\n");
evaluate_test(check_file_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE, TAG_CHECK_OFF),
"Check file memory with private mapping, sync error mode, mmap/mprotect memory and tag check off\n");
mte_disable_pstate_tco();
evaluate_test(check_anonymous_memory_mapping(USE_MMAP, MTE_NONE_ERR, MAP_PRIVATE, TAG_CHECK_OFF),
"Check anonymous memory with private mapping, no error mode, mmap memory and tag check off\n");
evaluate_test(check_file_memory_mapping(USE_MPROTECT, MTE_NONE_ERR, MAP_PRIVATE, TAG_CHECK_OFF),
"Check file memory with private mapping, no error mode, mmap/mprotect memory and tag check off\n");
evaluate_test(check_anonymous_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE, TAG_CHECK_ON),
"Check anonymous memory with private mapping, sync error mode, mmap memory and tag check on\n");
evaluate_test(check_anonymous_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE, TAG_CHECK_ON),
"Check anonymous memory with private mapping, sync error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_anonymous_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED, TAG_CHECK_ON),
"Check anonymous memory with shared mapping, sync error mode, mmap memory and tag check on\n");
evaluate_test(check_anonymous_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_SHARED, TAG_CHECK_ON),
"Check anonymous memory with shared mapping, sync error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_anonymous_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE, TAG_CHECK_ON),
"Check anonymous memory with private mapping, async error mode, mmap memory and tag check on\n");
evaluate_test(check_anonymous_memory_mapping(USE_MPROTECT, MTE_ASYNC_ERR, MAP_PRIVATE, TAG_CHECK_ON),
"Check anonymous memory with private mapping, async error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_anonymous_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED, TAG_CHECK_ON),
"Check anonymous memory with shared mapping, async error mode, mmap memory and tag check on\n");
evaluate_test(check_anonymous_memory_mapping(USE_MPROTECT, MTE_ASYNC_ERR, MAP_SHARED, TAG_CHECK_ON),
"Check anonymous memory with shared mapping, async error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_file_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE, TAG_CHECK_ON),
"Check file memory with private mapping, sync error mode, mmap memory and tag check on\n");
evaluate_test(check_file_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_PRIVATE, TAG_CHECK_ON),
"Check file memory with private mapping, sync error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_file_memory_mapping(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED, TAG_CHECK_ON),
"Check file memory with shared mapping, sync error mode, mmap memory and tag check on\n");
evaluate_test(check_file_memory_mapping(USE_MPROTECT, MTE_SYNC_ERR, MAP_SHARED, TAG_CHECK_ON),
"Check file memory with shared mapping, sync error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_file_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE, TAG_CHECK_ON),
"Check file memory with private mapping, async error mode, mmap memory and tag check on\n");
evaluate_test(check_file_memory_mapping(USE_MPROTECT, MTE_ASYNC_ERR, MAP_PRIVATE, TAG_CHECK_ON),
"Check file memory with private mapping, async error mode, mmap/mprotect memory and tag check on\n");
evaluate_test(check_file_memory_mapping(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED, TAG_CHECK_ON),
"Check file memory with shared mapping, async error mode, mmap memory and tag check on\n");
evaluate_test(check_file_memory_mapping(USE_MPROTECT, MTE_ASYNC_ERR, MAP_SHARED, TAG_CHECK_ON),
"Check file memory with shared 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),
"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),
"Check clear PROT_MTE flags with private mapping and sync error 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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