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linux/tools/thermal/tmon/sysfs.c
Florian Fainelli 6c58cf40e3 tools/thermal: Fix possible path truncations 
A build with -D_FORTIFY_SOURCE=2 enabled will produce the following warnings:

sysfs.c:63:30: warning: '%s' directive output may be truncated writing up to 255 bytes into a region of size between 0 and 255 [-Wformat-truncation=]
  snprintf(filepath, 256, "%s/%s", path, filename);
                              ^~
Bump up the buffer to PATH_MAX which is the limit and account for all of
the possible NUL and separators that could lead to exceeding the
allocated buffer sizes.

Fixes: 94f69966fa ("tools/thermal: Introduce tmon, a tool for thermal subsystem")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2022-08-03 19:28:46 +02:00

592 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* sysfs.c sysfs ABI access functions for TMON program
*
* Copyright (C) 2013 Intel Corporation. All rights reserved.
*
* Author: Jacob Pan <jacob.jun.pan@linux.intel.com>
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <dirent.h>
#include <libintl.h>
#include <limits.h>
#include <ctype.h>
#include <time.h>
#include <syslog.h>
#include <sys/time.h>
#include <errno.h>
#include "tmon.h"
struct tmon_platform_data ptdata;
const char *trip_type_name[] = {
"critical",
"hot",
"passive",
"active",
};
int sysfs_set_ulong(char *path, char *filename, unsigned long val)
{
FILE *fd;
int ret = -1;
char filepath[PATH_MAX + 2]; /* NUL and '/' */
snprintf(filepath, sizeof(filepath), "%s/%s", path, filename);
fd = fopen(filepath, "w");
if (!fd) {
syslog(LOG_ERR, "Err: open %s: %s\n", __func__, filepath);
return ret;
}
ret = fprintf(fd, "%lu", val);
fclose(fd);
return 0;
}
/* history of thermal data, used for control algo */
#define NR_THERMAL_RECORDS 3
struct thermal_data_record trec[NR_THERMAL_RECORDS];
int cur_thermal_record; /* index to the trec array */
static int sysfs_get_ulong(char *path, char *filename, unsigned long *p_ulong)
{
FILE *fd;
int ret = -1;
char filepath[PATH_MAX + 2]; /* NUL and '/' */
snprintf(filepath, sizeof(filepath), "%s/%s", path, filename);
fd = fopen(filepath, "r");
if (!fd) {
syslog(LOG_ERR, "Err: open %s: %s\n", __func__, filepath);
return ret;
}
ret = fscanf(fd, "%lu", p_ulong);
fclose(fd);
return 0;
}
static int sysfs_get_string(char *path, char *filename, char *str)
{
FILE *fd;
int ret = -1;
char filepath[PATH_MAX + 2]; /* NUL and '/' */
snprintf(filepath, sizeof(filepath), "%s/%s", path, filename);
fd = fopen(filepath, "r");
if (!fd) {
syslog(LOG_ERR, "Err: open %s: %s\n", __func__, filepath);
return ret;
}
ret = fscanf(fd, "%256s", str);
fclose(fd);
return ret;
}
/* get states of the cooling device instance */
static int probe_cdev(struct cdev_info *cdi, char *path)
{
sysfs_get_string(path, "type", cdi->type);
sysfs_get_ulong(path, "max_state", &cdi->max_state);
sysfs_get_ulong(path, "cur_state", &cdi->cur_state);
syslog(LOG_INFO, "%s: %s: type %s, max %lu, curr %lu inst %d\n",
__func__, path,
cdi->type, cdi->max_state, cdi->cur_state, cdi->instance);
return 0;
}
static int str_to_trip_type(char *name)
{
int i;
for (i = 0; i < NR_THERMAL_TRIP_TYPE; i++) {
if (!strcmp(name, trip_type_name[i]))
return i;
}
return -ENOENT;
}
/* scan and fill in trip point info for a thermal zone and trip point id */
static int get_trip_point_data(char *tz_path, int tzid, int tpid)
{
char filename[256];
char temp_str[256];
int trip_type;
if (tpid >= MAX_NR_TRIP)
return -EINVAL;
/* check trip point type */
snprintf(filename, sizeof(filename), "trip_point_%d_type", tpid);
sysfs_get_string(tz_path, filename, temp_str);
trip_type = str_to_trip_type(temp_str);
if (trip_type < 0) {
syslog(LOG_ERR, "%s:%s no matching type\n", __func__, temp_str);
return -ENOENT;
}
ptdata.tzi[tzid].tp[tpid].type = trip_type;
syslog(LOG_INFO, "%s:tz:%d tp:%d:type:%s type id %d\n", __func__, tzid,
tpid, temp_str, trip_type);
/* TODO: check attribute */
return 0;
}
/* return instance id for file format such as trip_point_4_temp */
static int get_instance_id(char *name, int pos, int skip)
{
char *ch;
int i = 0;
ch = strtok(name, "_");
while (ch != NULL) {
++i;
syslog(LOG_INFO, "%s:%s:%s:%d", __func__, name, ch, i);
ch = strtok(NULL, "_");
if (pos == i)
return atol(ch + skip);
}
return -1;
}
/* Find trip point info of a thermal zone */
static int find_tzone_tp(char *tz_name, char *d_name, struct tz_info *tzi,
int tz_id)
{
int tp_id;
unsigned long temp_ulong;
if (strstr(d_name, "trip_point") &&
strstr(d_name, "temp")) {
/* check if trip point temp is non-zero
* ignore 0/invalid trip points
*/
sysfs_get_ulong(tz_name, d_name, &temp_ulong);
if (temp_ulong < MAX_TEMP_KC) {
tzi->nr_trip_pts++;
/* found a valid trip point */
tp_id = get_instance_id(d_name, 2, 0);
syslog(LOG_DEBUG, "tzone %s trip %d temp %lu tpnode %s",
tz_name, tp_id, temp_ulong, d_name);
if (tp_id < 0 || tp_id >= MAX_NR_TRIP) {
syslog(LOG_ERR, "Failed to find TP inst %s\n",
d_name);
return -1;
}
get_trip_point_data(tz_name, tz_id, tp_id);
tzi->tp[tp_id].temp = temp_ulong;
}
}
return 0;
}
/* check cooling devices for binding info. */
static int find_tzone_cdev(struct dirent *nl, char *tz_name,
struct tz_info *tzi, int tz_id, int cid)
{
unsigned long trip_instance = 0;
char cdev_name_linked[256];
char cdev_name[PATH_MAX];
char cdev_trip_name[PATH_MAX];
int cdev_id;
if (nl->d_type == DT_LNK) {
syslog(LOG_DEBUG, "TZ%d: cdev: %s cid %d\n", tz_id, nl->d_name,
cid);
tzi->nr_cdev++;
if (tzi->nr_cdev > ptdata.nr_cooling_dev) {
syslog(LOG_ERR, "Err: Too many cdev? %d\n",
tzi->nr_cdev);
return -EINVAL;
}
/* find the link to real cooling device record binding */
snprintf(cdev_name, sizeof(cdev_name) - 2, "%s/%s",
tz_name, nl->d_name);
memset(cdev_name_linked, 0, sizeof(cdev_name_linked));
if (readlink(cdev_name, cdev_name_linked,
sizeof(cdev_name_linked) - 1) != -1) {
cdev_id = get_instance_id(cdev_name_linked, 1,
sizeof("device") - 1);
syslog(LOG_DEBUG, "cdev %s linked to %s : %d\n",
cdev_name, cdev_name_linked, cdev_id);
tzi->cdev_binding |= (1 << cdev_id);
/* find the trip point in which the cdev is binded to
* in this tzone
*/
snprintf(cdev_trip_name, sizeof(cdev_trip_name) - 1,
"%s%s", nl->d_name, "_trip_point");
sysfs_get_ulong(tz_name, cdev_trip_name,
&trip_instance);
/* validate trip point range, e.g. trip could return -1
* when passive is enabled
*/
if (trip_instance > MAX_NR_TRIP)
trip_instance = 0;
tzi->trip_binding[cdev_id] |= 1 << trip_instance;
syslog(LOG_DEBUG, "cdev %s -> trip:%lu: 0x%lx %d\n",
cdev_name, trip_instance,
tzi->trip_binding[cdev_id],
cdev_id);
}
return 0;
}
return -ENODEV;
}
/*****************************************************************************
* Before calling scan_tzones, thermal sysfs must be probed to determine
* the number of thermal zones and cooling devices.
* We loop through each thermal zone and fill in tz_info struct, i.e.
* ptdata.tzi[]
root@jacob-chiefriver:~# tree -d /sys/class/thermal/thermal_zone0
/sys/class/thermal/thermal_zone0
|-- cdev0 -> ../cooling_device4
|-- cdev1 -> ../cooling_device3
|-- cdev10 -> ../cooling_device7
|-- cdev11 -> ../cooling_device6
|-- cdev12 -> ../cooling_device5
|-- cdev2 -> ../cooling_device2
|-- cdev3 -> ../cooling_device1
|-- cdev4 -> ../cooling_device0
|-- cdev5 -> ../cooling_device12
|-- cdev6 -> ../cooling_device11
|-- cdev7 -> ../cooling_device10
|-- cdev8 -> ../cooling_device9
|-- cdev9 -> ../cooling_device8
|-- device -> ../../../LNXSYSTM:00/device:62/LNXTHERM:00
|-- power
`-- subsystem -> ../../../../class/thermal
*****************************************************************************/
static int scan_tzones(void)
{
DIR *dir;
struct dirent **namelist;
char tz_name[256];
int i, j, n, k = 0;
if (!ptdata.nr_tz_sensor)
return -1;
for (i = 0; i <= ptdata.max_tz_instance; i++) {
memset(tz_name, 0, sizeof(tz_name));
snprintf(tz_name, 256, "%s/%s%d", THERMAL_SYSFS, TZONE, i);
dir = opendir(tz_name);
if (!dir) {
syslog(LOG_INFO, "Thermal zone %s skipped\n", tz_name);
continue;
}
/* keep track of valid tzones */
n = scandir(tz_name, &namelist, 0, alphasort);
if (n < 0)
syslog(LOG_ERR, "scandir failed in %s", tz_name);
else {
sysfs_get_string(tz_name, "type", ptdata.tzi[k].type);
ptdata.tzi[k].instance = i;
/* detect trip points and cdev attached to this tzone */
j = 0; /* index for cdev */
ptdata.tzi[k].nr_cdev = 0;
ptdata.tzi[k].nr_trip_pts = 0;
while (n--) {
char *temp_str;
if (find_tzone_tp(tz_name, namelist[n]->d_name,
&ptdata.tzi[k], k))
break;
temp_str = strstr(namelist[n]->d_name, "cdev");
if (!temp_str) {
free(namelist[n]);
continue;
}
if (!find_tzone_cdev(namelist[n], tz_name,
&ptdata.tzi[k], i, j))
j++; /* increment cdev index */
free(namelist[n]);
}
free(namelist);
}
/*TODO: reverse trip points */
closedir(dir);
syslog(LOG_INFO, "TZ %d has %d cdev\n", i,
ptdata.tzi[k].nr_cdev);
k++;
}
return 0;
}
static int scan_cdevs(void)
{
DIR *dir;
struct dirent **namelist;
char cdev_name[256];
int i, n, k = 0;
if (!ptdata.nr_cooling_dev) {
fprintf(stderr, "No cooling devices found\n");
return 0;
}
for (i = 0; i <= ptdata.max_cdev_instance; i++) {
memset(cdev_name, 0, sizeof(cdev_name));
snprintf(cdev_name, 256, "%s/%s%d", THERMAL_SYSFS, CDEV, i);
dir = opendir(cdev_name);
if (!dir) {
syslog(LOG_INFO, "Cooling dev %s skipped\n", cdev_name);
/* there is a gap in cooling device id, check again
* for the same index.
*/
continue;
}
n = scandir(cdev_name, &namelist, 0, alphasort);
if (n < 0)
syslog(LOG_ERR, "scandir failed in %s", cdev_name);
else {
sysfs_get_string(cdev_name, "type", ptdata.cdi[k].type);
ptdata.cdi[k].instance = i;
if (strstr(ptdata.cdi[k].type, ctrl_cdev)) {
ptdata.cdi[k].flag |= CDEV_FLAG_IN_CONTROL;
syslog(LOG_DEBUG, "control cdev id %d\n", i);
}
while (n--)
free(namelist[n]);
free(namelist);
}
closedir(dir);
k++;
}
return 0;
}
int probe_thermal_sysfs(void)
{
DIR *dir;
struct dirent **namelist;
int n;
dir = opendir(THERMAL_SYSFS);
if (!dir) {
fprintf(stderr, "\nNo thermal sysfs, exit\n");
return -1;
}
n = scandir(THERMAL_SYSFS, &namelist, 0, alphasort);
if (n < 0)
syslog(LOG_ERR, "scandir failed in thermal sysfs");
else {
/* detect number of thermal zones and cooling devices */
while (n--) {
int inst;
if (strstr(namelist[n]->d_name, CDEV)) {
inst = get_instance_id(namelist[n]->d_name, 1,
sizeof("device") - 1);
/* keep track of the max cooling device since
* there may be gaps.
*/
if (inst > ptdata.max_cdev_instance)
ptdata.max_cdev_instance = inst;
syslog(LOG_DEBUG, "found cdev: %s %d %d\n",
namelist[n]->d_name,
ptdata.nr_cooling_dev,
ptdata.max_cdev_instance);
ptdata.nr_cooling_dev++;
} else if (strstr(namelist[n]->d_name, TZONE)) {
inst = get_instance_id(namelist[n]->d_name, 1,
sizeof("zone") - 1);
if (inst > ptdata.max_tz_instance)
ptdata.max_tz_instance = inst;
syslog(LOG_DEBUG, "found tzone: %s %d %d\n",
namelist[n]->d_name,
ptdata.nr_tz_sensor,
ptdata.max_tz_instance);
ptdata.nr_tz_sensor++;
}
free(namelist[n]);
}
free(namelist);
}
syslog(LOG_INFO, "found %d tzone(s), %d cdev(s), target zone %d\n",
ptdata.nr_tz_sensor, ptdata.nr_cooling_dev,
target_thermal_zone);
closedir(dir);
if (!ptdata.nr_tz_sensor) {
fprintf(stderr, "\nNo thermal zones found, exit\n\n");
return -1;
}
ptdata.tzi = calloc(ptdata.max_tz_instance+1, sizeof(struct tz_info));
if (!ptdata.tzi) {
fprintf(stderr, "Err: allocate tz_info\n");
return -1;
}
/* we still show thermal zone information if there is no cdev */
if (ptdata.nr_cooling_dev) {
ptdata.cdi = calloc(ptdata.max_cdev_instance + 1,
sizeof(struct cdev_info));
if (!ptdata.cdi) {
free(ptdata.tzi);
fprintf(stderr, "Err: allocate cdev_info\n");
return -1;
}
}
/* now probe tzones */
if (scan_tzones())
return -1;
if (scan_cdevs())
return -1;
return 0;
}
/* convert sysfs zone instance to zone array index */
int zone_instance_to_index(int zone_inst)
{
int i;
for (i = 0; i < ptdata.nr_tz_sensor; i++)
if (ptdata.tzi[i].instance == zone_inst)
return i;
return -ENOENT;
}
/* read temperature of all thermal zones */
int update_thermal_data()
{
int i;
int next_thermal_record = cur_thermal_record + 1;
char tz_name[256];
static unsigned long samples;
if (!ptdata.nr_tz_sensor) {
syslog(LOG_ERR, "No thermal zones found!\n");
return -1;
}
/* circular buffer for keeping historic data */
if (next_thermal_record >= NR_THERMAL_RECORDS)
next_thermal_record = 0;
gettimeofday(&trec[next_thermal_record].tv, NULL);
if (tmon_log) {
fprintf(tmon_log, "%lu ", ++samples);
fprintf(tmon_log, "%3.1f ", p_param.t_target);
}
for (i = 0; i < ptdata.nr_tz_sensor; i++) {
memset(tz_name, 0, sizeof(tz_name));
snprintf(tz_name, 256, "%s/%s%d", THERMAL_SYSFS, TZONE,
ptdata.tzi[i].instance);
sysfs_get_ulong(tz_name, "temp",
&trec[next_thermal_record].temp[i]);
if (tmon_log)
fprintf(tmon_log, "%lu ",
trec[next_thermal_record].temp[i] / 1000);
}
cur_thermal_record = next_thermal_record;
for (i = 0; i < ptdata.nr_cooling_dev; i++) {
char cdev_name[256];
unsigned long val;
snprintf(cdev_name, 256, "%s/%s%d", THERMAL_SYSFS, CDEV,
ptdata.cdi[i].instance);
probe_cdev(&ptdata.cdi[i], cdev_name);
val = ptdata.cdi[i].cur_state;
if (val > 1000000)
val = 0;
if (tmon_log)
fprintf(tmon_log, "%lu ", val);
}
if (tmon_log) {
fprintf(tmon_log, "\n");
fflush(tmon_log);
}
return 0;
}
void set_ctrl_state(unsigned long state)
{
char ctrl_cdev_path[256];
int i;
unsigned long cdev_state;
if (no_control)
return;
/* set all ctrl cdev to the same state */
for (i = 0; i < ptdata.nr_cooling_dev; i++) {
if (ptdata.cdi[i].flag & CDEV_FLAG_IN_CONTROL) {
if (ptdata.cdi[i].max_state < 10) {
strcpy(ctrl_cdev, "None.");
return;
}
/* scale to percentage of max_state */
cdev_state = state * ptdata.cdi[i].max_state/100;
syslog(LOG_DEBUG,
"ctrl cdev %d set state %lu scaled to %lu\n",
ptdata.cdi[i].instance, state, cdev_state);
snprintf(ctrl_cdev_path, 256, "%s/%s%d", THERMAL_SYSFS,
CDEV, ptdata.cdi[i].instance);
syslog(LOG_DEBUG, "ctrl cdev path %s", ctrl_cdev_path);
sysfs_set_ulong(ctrl_cdev_path, "cur_state",
cdev_state);
}
}
}
void get_ctrl_state(unsigned long *state)
{
char ctrl_cdev_path[256];
int ctrl_cdev_id = -1;
int i;
/* TODO: take average of all ctrl types. also consider change based on
* uevent. Take the first reading for now.
*/
for (i = 0; i < ptdata.nr_cooling_dev; i++) {
if (ptdata.cdi[i].flag & CDEV_FLAG_IN_CONTROL) {
ctrl_cdev_id = ptdata.cdi[i].instance;
syslog(LOG_INFO, "ctrl cdev %d get state\n",
ptdata.cdi[i].instance);
break;
}
}
if (ctrl_cdev_id == -1) {
*state = 0;
return;
}
snprintf(ctrl_cdev_path, 256, "%s/%s%d", THERMAL_SYSFS,
CDEV, ctrl_cdev_id);
sysfs_get_ulong(ctrl_cdev_path, "cur_state", state);
}
void free_thermal_data(void)
{
free(ptdata.tzi);
free(ptdata.cdi);
}
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