Commit f3b2a26c authored by Amit Kachhap's avatar Amit Kachhap Committed by Will Deacon
Browse files

kselftest/arm64: Verify mte tag inclusion via prctl



This testcase verifies that the tag generated with "irg" instruction
contains only included tags. This is done via prtcl call.

This test covers 4 scenarios,
* At least one included tag.
* More than one included tags.
* All included.
* None included.

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/20201002115630.24683-3-amit.kachhap@arm.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent e9b60476
// 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 * 2)
#define MTE_LAST_TAG_MASK (0x7FFF)
static int verify_mte_pointer_validity(char *ptr, int mode)
{
mte_initialize_current_context(mode, (uintptr_t)ptr, BUFFER_SIZE);
/* Check the validity of the tagged pointer */
memset((void *)ptr, '1', BUFFER_SIZE);
mte_wait_after_trig();
if (cur_mte_cxt.fault_valid)
return KSFT_FAIL;
/* Proceed further for nonzero tags */
if (!MT_FETCH_TAG((uintptr_t)ptr))
return KSFT_PASS;
mte_initialize_current_context(mode, (uintptr_t)ptr, BUFFER_SIZE + 1);
/* Check the validity outside the range */
ptr[BUFFER_SIZE] = '2';
mte_wait_after_trig();
if (!cur_mte_cxt.fault_valid)
return KSFT_FAIL;
else
return KSFT_PASS;
}
static int check_single_included_tags(int mem_type, int mode)
{
char *ptr;
int tag, run, result = KSFT_PASS;
ptr = (char *)mte_allocate_memory(BUFFER_SIZE + MT_GRANULE_SIZE, mem_type, 0, false);
if (check_allocated_memory(ptr, BUFFER_SIZE + MT_GRANULE_SIZE,
mem_type, false) != KSFT_PASS)
return KSFT_FAIL;
for (tag = 0; (tag < MT_TAG_COUNT) && (result == KSFT_PASS); tag++) {
mte_switch_mode(mode, MT_INCLUDE_VALID_TAG(tag));
/* Try to catch a excluded tag by a number of tries. */
for (run = 0; (run < RUNS) && (result == KSFT_PASS); run++) {
ptr = (char *)mte_insert_tags(ptr, BUFFER_SIZE);
/* Check tag value */
if (MT_FETCH_TAG((uintptr_t)ptr) == tag) {
ksft_print_msg("FAIL: wrong tag = 0x%x with include mask=0x%x\n",
MT_FETCH_TAG((uintptr_t)ptr),
MT_INCLUDE_VALID_TAG(tag));
result = KSFT_FAIL;
break;
}
result = verify_mte_pointer_validity(ptr, mode);
}
}
mte_free_memory_tag_range((void *)ptr, BUFFER_SIZE, mem_type, 0, MT_GRANULE_SIZE);
return result;
}
static int check_multiple_included_tags(int mem_type, int mode)
{
char *ptr;
int tag, run, result = KSFT_PASS;
unsigned long excl_mask = 0;
ptr = (char *)mte_allocate_memory(BUFFER_SIZE + MT_GRANULE_SIZE, mem_type, 0, false);
if (check_allocated_memory(ptr, BUFFER_SIZE + MT_GRANULE_SIZE,
mem_type, false) != KSFT_PASS)
return KSFT_FAIL;
for (tag = 0; (tag < MT_TAG_COUNT - 1) && (result == KSFT_PASS); tag++) {
excl_mask |= 1 << tag;
mte_switch_mode(mode, MT_INCLUDE_VALID_TAGS(excl_mask));
/* Try to catch a excluded tag by a number of tries. */
for (run = 0; (run < RUNS) && (result == KSFT_PASS); run++) {
ptr = (char *)mte_insert_tags(ptr, BUFFER_SIZE);
/* Check tag value */
if (MT_FETCH_TAG((uintptr_t)ptr) < tag) {
ksft_print_msg("FAIL: wrong tag = 0x%x with include mask=0x%x\n",
MT_FETCH_TAG((uintptr_t)ptr),
MT_INCLUDE_VALID_TAGS(excl_mask));
result = KSFT_FAIL;
break;
}
result = verify_mte_pointer_validity(ptr, mode);
}
}
mte_free_memory_tag_range((void *)ptr, BUFFER_SIZE, mem_type, 0, MT_GRANULE_SIZE);
return result;
}
static int check_all_included_tags(int mem_type, int mode)
{
char *ptr;
int run, result = KSFT_PASS;
ptr = (char *)mte_allocate_memory(BUFFER_SIZE + MT_GRANULE_SIZE, mem_type, 0, false);
if (check_allocated_memory(ptr, BUFFER_SIZE + MT_GRANULE_SIZE,
mem_type, false) != KSFT_PASS)
return KSFT_FAIL;
mte_switch_mode(mode, MT_INCLUDE_TAG_MASK);
/* Try to catch a excluded tag by a number of tries. */
for (run = 0; (run < RUNS) && (result == KSFT_PASS); run++) {
ptr = (char *)mte_insert_tags(ptr, BUFFER_SIZE);
/*
* Here tag byte can be between 0x0 to 0xF (full allowed range)
* so no need to match so just verify if it is writable.
*/
result = verify_mte_pointer_validity(ptr, mode);
}
mte_free_memory_tag_range((void *)ptr, BUFFER_SIZE, mem_type, 0, MT_GRANULE_SIZE);
return result;
}
static int check_none_included_tags(int mem_type, int mode)
{
char *ptr;
int run;
ptr = (char *)mte_allocate_memory(BUFFER_SIZE, mem_type, 0, false);
if (check_allocated_memory(ptr, BUFFER_SIZE, mem_type, false) != KSFT_PASS)
return KSFT_FAIL;
mte_switch_mode(mode, MT_EXCLUDE_TAG_MASK);
/* Try to catch a excluded tag by a number of tries. */
for (run = 0; run < RUNS; run++) {
ptr = (char *)mte_insert_tags(ptr, BUFFER_SIZE);
/* Here all tags exluded so tag value generated should be 0 */
if (MT_FETCH_TAG((uintptr_t)ptr)) {
ksft_print_msg("FAIL: included tag value found\n");
mte_free_memory((void *)ptr, BUFFER_SIZE, mem_type, true);
return KSFT_FAIL;
}
mte_initialize_current_context(mode, (uintptr_t)ptr, BUFFER_SIZE);
/* Check the write validity of the untagged pointer */
memset((void *)ptr, '1', BUFFER_SIZE);
mte_wait_after_trig();
if (cur_mte_cxt.fault_valid)
break;
}
mte_free_memory((void *)ptr, BUFFER_SIZE, mem_type, false);
if (cur_mte_cxt.fault_valid)
return KSFT_FAIL;
else
return KSFT_PASS;
}
int main(int argc, char *argv[])
{
int err;
err = mte_default_setup();
if (err)
return err;
/* Register SIGSEGV handler */
mte_register_signal(SIGSEGV, mte_default_handler);
evaluate_test(check_single_included_tags(USE_MMAP, MTE_SYNC_ERR),
"Check an included tag value with sync mode\n");
evaluate_test(check_multiple_included_tags(USE_MMAP, MTE_SYNC_ERR),
"Check different included tags value with sync mode\n");
evaluate_test(check_none_included_tags(USE_MMAP, MTE_SYNC_ERR),
"Check none included tags value with sync mode\n");
evaluate_test(check_all_included_tags(USE_MMAP, MTE_SYNC_ERR),
"Check all included tags value with sync mode\n");
mte_restore_setup();
ksft_print_cnts();
return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
}
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