Commit b22b8b9f authored by Tetsuo Handa's avatar Tetsuo Handa Committed by James Morris
Browse files

TOMOYO: Rename meminfo to stat and show more statistics.



Show statistics such as last policy update time and last policy violation time
in addition to memory usage.
Signed-off-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent 2c47ab93
......@@ -9,47 +9,6 @@
#include "common.h"
#include <linux/slab.h>
/**
* tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
*
* @time: Seconds since 1970/01/01 00:00:00.
* @stamp: Pointer to "struct tomoyo_time".
*
* Returns nothing.
*
* This function does not handle Y2038 problem.
*/
static void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp)
{
static const u16 tomoyo_eom[2][12] = {
{ 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
{ 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
u16 y;
u8 m;
bool r;
stamp->sec = time % 60;
time /= 60;
stamp->min = time % 60;
time /= 60;
stamp->hour = time % 24;
time /= 24;
for (y = 1970; ; y++) {
const unsigned short days = (y & 3) ? 365 : 366;
if (time < days)
break;
time -= days;
}
r = (y & 3) == 0;
for (m = 0; m < 11 && time >= tomoyo_eom[r][m]; m++)
;
if (m)
time -= tomoyo_eom[r][m - 1];
stamp->year = y;
stamp->month = ++m;
stamp->day = ++time;
}
/**
* tomoyo_print_header - Get header line of audit log.
*
......
......@@ -1584,8 +1584,9 @@ static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
return;
snprintf(buffer, len - 1, "%s", cp);
tomoyo_normalize_line(buffer);
tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
false);
if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
false))
tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
kfree(buffer);
}
......@@ -1618,6 +1619,8 @@ int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
/* Nothing more to do if granted. */
if (r->granted)
return 0;
if (r->mode)
tomoyo_update_stat(r->mode);
switch (r->mode) {
case TOMOYO_CONFIG_ENFORCING:
error = -EPERM;
......@@ -1857,6 +1860,104 @@ static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
}
}
/* String table for /sys/kernel/security/tomoyo/stat interface. */
static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
[TOMOYO_STAT_POLICY_UPDATES] = "update:",
[TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
[TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
[TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
};
/* String table for /sys/kernel/security/tomoyo/stat interface. */
static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
[TOMOYO_MEMORY_POLICY] = "policy:",
[TOMOYO_MEMORY_AUDIT] = "audit log:",
[TOMOYO_MEMORY_QUERY] = "query message:",
};
/* Timestamp counter for last updated. */
static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
/* Counter for number of updates. */
static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
/**
* tomoyo_update_stat - Update statistic counters.
*
* @index: Index for policy type.
*
* Returns nothing.
*/
void tomoyo_update_stat(const u8 index)
{
struct timeval tv;
do_gettimeofday(&tv);
/*
* I don't use atomic operations because race condition is not fatal.
*/
tomoyo_stat_updated[index]++;
tomoyo_stat_modified[index] = tv.tv_sec;
}
/**
* tomoyo_read_stat - Read statistic data.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns nothing.
*/
static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
{
u8 i;
unsigned int total = 0;
if (head->r.eof)
return;
for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
tomoyo_io_printf(head, "Policy %-30s %10u",
tomoyo_policy_headers[i],
tomoyo_stat_updated[i]);
if (tomoyo_stat_modified[i]) {
struct tomoyo_time stamp;
tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
"%02u:%02u:%02u)",
stamp.year, stamp.month, stamp.day,
stamp.hour, stamp.min, stamp.sec);
}
tomoyo_set_lf(head);
}
for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
unsigned int used = tomoyo_memory_used[i];
total += used;
tomoyo_io_printf(head, "Memory used by %-22s %10u",
tomoyo_memory_headers[i], used);
used = tomoyo_memory_quota[i];
if (used)
tomoyo_io_printf(head, " (Quota: %10u)", used);
tomoyo_set_lf(head);
}
tomoyo_io_printf(head, "Total memory used: %10u\n",
total);
head->r.eof = true;
}
/**
* tomoyo_write_stat - Set memory quota.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns 0.
*/
static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
{
char *data = head->write_buf;
u8 i;
if (tomoyo_str_starts(&data, "Memory used by "))
for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
sscanf(data, "%u", &tomoyo_memory_quota[i]);
return 0;
}
/**
* tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
*
......@@ -1908,11 +2009,11 @@ int tomoyo_open_control(const u8 type, struct file *file)
head->read = tomoyo_read_version;
head->readbuf_size = 128;
break;
case TOMOYO_MEMINFO:
/* /sys/kernel/security/tomoyo/meminfo */
head->write = tomoyo_write_memory_quota;
head->read = tomoyo_read_memory_counter;
head->readbuf_size = 512;
case TOMOYO_STAT:
/* /sys/kernel/security/tomoyo/stat */
head->write = tomoyo_write_stat;
head->read = tomoyo_read_stat;
head->readbuf_size = 1024;
break;
case TOMOYO_PROFILE:
/* /sys/kernel/security/tomoyo/profile */
......@@ -2186,6 +2287,20 @@ ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
case -EPERM:
error = -EPERM;
goto out;
case 0:
switch (head->type) {
case TOMOYO_DOMAINPOLICY:
case TOMOYO_EXCEPTIONPOLICY:
case TOMOYO_DOMAIN_STATUS:
case TOMOYO_STAT:
case TOMOYO_PROFILE:
case TOMOYO_MANAGER:
tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
break;
default:
break;
}
break;
}
}
out:
......
......@@ -133,6 +133,7 @@ enum tomoyo_path_acl_index {
TOMOYO_MAX_PATH_OPERATION
};
/* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
enum tomoyo_memory_stat_type {
TOMOYO_MEMORY_POLICY,
TOMOYO_MEMORY_AUDIT,
......@@ -173,7 +174,7 @@ enum tomoyo_securityfs_interface_index {
TOMOYO_EXCEPTIONPOLICY,
TOMOYO_DOMAIN_STATUS,
TOMOYO_PROCESS_STATUS,
TOMOYO_MEMINFO,
TOMOYO_STAT,
TOMOYO_SELFDOMAIN,
TOMOYO_AUDIT,
TOMOYO_VERSION,
......@@ -237,6 +238,16 @@ enum tomoyo_mac_category_index {
*/
#define TOMOYO_RETRY_REQUEST 1
/* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
enum tomoyo_policy_stat_type {
/* Do not change this order. */
TOMOYO_STAT_POLICY_UPDATES,
TOMOYO_STAT_POLICY_LEARNING, /* == TOMOYO_CONFIG_LEARNING */
TOMOYO_STAT_POLICY_PERMISSIVE, /* == TOMOYO_CONFIG_PERMISSIVE */
TOMOYO_STAT_POLICY_ENFORCING, /* == TOMOYO_CONFIG_ENFORCING */
TOMOYO_MAX_POLICY_STAT
};
/* Index numbers for profile's PREFERENCE values. */
enum tomoyo_pref_index {
TOMOYO_PREF_MAX_AUDIT_LOG,
......@@ -648,8 +659,8 @@ char *tomoyo_realpath_from_path(struct path *path);
bool tomoyo_memory_ok(void *ptr);
void *tomoyo_commit_ok(void *data, const unsigned int size);
const struct tomoyo_path_info *tomoyo_get_name(const char *name);
void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);
int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);
void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp);
void tomoyo_update_stat(const u8 index);
void __init tomoyo_mm_init(void);
int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
const struct tomoyo_path_info *filename);
......
......@@ -29,16 +29,13 @@ void tomoyo_warn_oom(const char *function)
panic("MAC Initialization failed.\n");
}
/* Lock for protecting tomoyo_memory_used. */
static DEFINE_SPINLOCK(tomoyo_policy_memory_lock);
/* Memoy currently used by policy/audit log/query. */
unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
/* Memory quota for "policy"/"audit log"/"query". */
unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
/* Memory allocated for policy. */
static atomic_t tomoyo_policy_memory_size;
/* Quota for holding policy. */
static unsigned int tomoyo_quota_for_policy;
/**
* tomoyo_memory_ok - Check memory quota.
*
......@@ -50,15 +47,20 @@ static unsigned int tomoyo_quota_for_policy;
*/
bool tomoyo_memory_ok(void *ptr)
{
size_t s = ptr ? ksize(ptr) : 0;
atomic_add(s, &tomoyo_policy_memory_size);
if (ptr && (!tomoyo_quota_for_policy ||
atomic_read(&tomoyo_policy_memory_size)
<= tomoyo_quota_for_policy)) {
memset(ptr, 0, s);
return true;
if (ptr) {
const size_t s = ksize(ptr);
bool result;
spin_lock(&tomoyo_policy_memory_lock);
tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s;
result = !tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] ||
tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <=
tomoyo_memory_quota[TOMOYO_MEMORY_POLICY];
if (!result)
tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
spin_unlock(&tomoyo_policy_memory_lock);
if (result)
return true;
}
atomic_sub(s, &tomoyo_policy_memory_size);
tomoyo_warn_oom(__func__);
return false;
}
......@@ -91,7 +93,10 @@ void *tomoyo_commit_ok(void *data, const unsigned int size)
*/
void tomoyo_memory_free(void *ptr)
{
atomic_sub(ksize(ptr), &tomoyo_policy_memory_size);
size_t s = ksize(ptr);
spin_lock(&tomoyo_policy_memory_lock);
tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
spin_unlock(&tomoyo_policy_memory_lock);
kfree(ptr);
}
......@@ -162,7 +167,6 @@ const struct tomoyo_path_info *tomoyo_get_name(const char *name)
struct tomoyo_name *ptr;
unsigned int hash;
int len;
int allocated_len;
struct list_head *head;
if (!name)
......@@ -179,22 +183,17 @@ const struct tomoyo_path_info *tomoyo_get_name(const char *name)
goto out;
}
ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
allocated_len = ptr ? ksize(ptr) : 0;
if (!ptr || (tomoyo_quota_for_policy &&
atomic_read(&tomoyo_policy_memory_size) + allocated_len
> tomoyo_quota_for_policy)) {
if (tomoyo_memory_ok(ptr)) {
ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
memmove((char *) ptr->entry.name, name, len);
atomic_set(&ptr->head.users, 1);
tomoyo_fill_path_info(&ptr->entry);
list_add_tail(&ptr->head.list, head);
} else {
kfree(ptr);
ptr = NULL;
tomoyo_warn_oom(__func__);
goto out;
}
atomic_add(allocated_len, &tomoyo_policy_memory_size);
ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
memmove((char *) ptr->entry.name, name, len);
atomic_set(&ptr->head.users, 1);
tomoyo_fill_path_info(&ptr->entry);
list_add_tail(&ptr->head.list, head);
out:
out:
mutex_unlock(&tomoyo_policy_lock);
return ptr ? &ptr->entry : NULL;
}
......@@ -227,65 +226,3 @@ void __init tomoyo_mm_init(void)
}
#endif
}
/* Memory allocated for query lists. */
unsigned int tomoyo_query_memory_size;
/* Quota for holding query lists. */
unsigned int tomoyo_quota_for_query;
/**
* tomoyo_read_memory_counter - Check for memory usage in bytes.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns memory usage.
*/
void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
{
if (!head->r.eof) {
const unsigned int policy
= atomic_read(&tomoyo_policy_memory_size);
const unsigned int query = tomoyo_query_memory_size;
char buffer[64];
memset(buffer, 0, sizeof(buffer));
if (tomoyo_quota_for_policy)
snprintf(buffer, sizeof(buffer) - 1,
" (Quota: %10u)",
tomoyo_quota_for_policy);
else
buffer[0] = '\0';
tomoyo_io_printf(head, "Policy: %10u%s\n", policy,
buffer);
if (tomoyo_quota_for_query)
snprintf(buffer, sizeof(buffer) - 1,
" (Quota: %10u)",
tomoyo_quota_for_query);
else
buffer[0] = '\0';
tomoyo_io_printf(head, "Query lists: %10u%s\n", query,
buffer);
tomoyo_io_printf(head, "Total: %10u\n", policy + query);
head->r.eof = true;
}
}
/**
* tomoyo_write_memory_quota - Set memory quota.
*
* @head: Pointer to "struct tomoyo_io_buffer".
*
* Returns 0.
*/
int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head)
{
char *data = head->write_buf;
unsigned int size;
if (sscanf(data, "Policy: %u", &size) == 1)
tomoyo_quota_for_policy = size;
else if (sscanf(data, "Query lists: %u", &size) == 1)
tomoyo_quota_for_query = size;
return 0;
}
......@@ -143,8 +143,8 @@ static int __init tomoyo_initerface_init(void)
TOMOYO_DOMAIN_STATUS);
tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
TOMOYO_PROCESS_STATUS);
tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
TOMOYO_MEMINFO);
tomoyo_create_entry("stat", 0644, tomoyo_dir,
TOMOYO_STAT);
tomoyo_create_entry("profile", 0600, tomoyo_dir,
TOMOYO_PROFILE);
tomoyo_create_entry("manager", 0600, tomoyo_dir,
......
......@@ -46,6 +46,47 @@ const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = {
[TOMOYO_MAC_FILE_PIVOT_ROOT] = TOMOYO_MAC_CATEGORY_FILE,
};
/**
* tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
*
* @time: Seconds since 1970/01/01 00:00:00.
* @stamp: Pointer to "struct tomoyo_time".
*
* Returns nothing.
*
* This function does not handle Y2038 problem.
*/
void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp)
{
static const u16 tomoyo_eom[2][12] = {
{ 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
{ 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
u16 y;
u8 m;
bool r;
stamp->sec = time % 60;
time /= 60;
stamp->min = time % 60;
time /= 60;
stamp->hour = time % 24;
time /= 24;
for (y = 1970; ; y++) {
const unsigned short days = (y & 3) ? 365 : 366;
if (time < days)
break;
time -= days;
}
r = (y & 3) == 0;
for (m = 0; m < 11 && time >= tomoyo_eom[r][m]; m++)
;
if (m)
time -= tomoyo_eom[r][m - 1];
stamp->year = y;
stamp->month = ++m;
stamp->day = ++time;
}
/**
* tomoyo_permstr - Find permission keywords.
*
......
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