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kermel: Refactoring and separating dynamic signature-related structures and functions

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This commit is contained in:
ShirkNeko
2025-07-28 22:44:24 +08:00
parent d21f92d817
commit 3ae1a3b10a
5 changed files with 552 additions and 499 deletions
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1
kernel/Makefile
View File

@@ -1,5 +1,6 @@
kernelsu-objs := ksu.o kernelsu-objs := ksu.o
kernelsu-objs += allowlist.o kernelsu-objs += allowlist.o
kernelsu-objs += dynamic_sign.o
kernelsu-objs += apk_sign.o kernelsu-objs += apk_sign.o
kernelsu-objs += sucompat.o kernelsu-objs += sucompat.o
kernelsu-objs += throne_tracker.o kernelsu-objs += throne_tracker.o

483
kernel/apk_sign.c
View File

@@ -16,471 +16,11 @@
#endif #endif
#include "apk_sign.h" #include "apk_sign.h"
#include "dynamic_sign.h"
#include "klog.h" // IWYU pragma: keep #include "klog.h" // IWYU pragma: keep
#include "kernel_compat.h" #include "kernel_compat.h"
#include "manager_sign.h" #include "manager_sign.h"
// Expected sizes and hashes for various APK signatures
#define DYNAMIC_SIGN_FILE_MAGIC 0x7f445347 // 'DSG', u32
#define DYNAMIC_SIGN_FILE_VERSION 1 // u32
#define KERNEL_SU_DYNAMIC_SIGN "/data/adb/ksu/.dynamic_sign"
#define MAX_MANAGERS 2
static struct manager_info active_managers[MAX_MANAGERS];
static DEFINE_SPINLOCK(managers_lock);
static struct dynamic_sign_config dynamic_sign = {
.size = 0x300,
.hash = "0000000000000000000000000000000000000000000000000000000000000000",
.is_set = 0
};
static DEFINE_SPINLOCK(dynamic_sign_lock);
static struct work_struct ksu_save_dynamic_sign_work;
static struct work_struct ksu_load_dynamic_sign_work;
static struct work_struct ksu_clear_dynamic_sign_work;
static inline bool is_dynamic_sign_enabled(void)
{
unsigned long flags;
bool enabled;
spin_lock_irqsave(&dynamic_sign_lock, flags);
enabled = dynamic_sign.is_set;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
return enabled;
}
void ksu_add_manager(uid_t uid, int signature_index)
{
unsigned long flags;
int i;
if (!is_dynamic_sign_enabled()) {
pr_info("Dynamic sign not enabled, skipping multi-manager add\n");
return;
}
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active && active_managers[i].uid == uid) {
active_managers[i].signature_index = signature_index;
spin_unlock_irqrestore(&managers_lock, flags);
pr_info("Updated manager uid=%d, signature_index=%d\n", uid, signature_index);
return;
}
}
for (i = 0; i < MAX_MANAGERS; i++) {
if (!active_managers[i].is_active) {
active_managers[i].uid = uid;
active_managers[i].signature_index = signature_index;
active_managers[i].is_active = true;
spin_unlock_irqrestore(&managers_lock, flags);
pr_info("Added manager uid=%d, signature_index=%d\n", uid, signature_index);
return;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
pr_warn("Failed to add manager, no free slots\n");
}
void ksu_remove_manager(uid_t uid)
{
unsigned long flags;
int i;
if (!is_dynamic_sign_enabled()) {
return;
}
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active && active_managers[i].uid == uid) {
active_managers[i].is_active = false;
pr_info("Removed manager uid=%d\n", uid);
break;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
}
bool ksu_is_any_manager(uid_t uid)
{
unsigned long flags;
bool is_manager = false;
int i;
if (!is_dynamic_sign_enabled()) {
return false;
}
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active && active_managers[i].uid == uid) {
is_manager = true;
break;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
return is_manager;
}
int ksu_get_manager_signature_index(uid_t uid)
{
unsigned long flags;
int signature_index = -1;
int i;
if (ksu_manager_uid != KSU_INVALID_UID && uid == ksu_manager_uid) {
return 1;
}
if (!is_dynamic_sign_enabled()) {
return -1;
}
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active && active_managers[i].uid == uid) {
signature_index = active_managers[i].signature_index;
break;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
return signature_index;
}
static void clear_all_managers(void)
{
unsigned long flags;
int i;
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active) {
pr_info("Clearing manager uid=%d due to dynamic_sign disable\n",
active_managers[i].uid);
active_managers[i].is_active = false;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
}
static void do_save_dynamic_sign(struct work_struct *work)
{
u32 magic = DYNAMIC_SIGN_FILE_MAGIC;
u32 version = DYNAMIC_SIGN_FILE_VERSION;
struct dynamic_sign_config config_to_save;
loff_t off = 0;
unsigned long flags;
struct file *fp;
spin_lock_irqsave(&dynamic_sign_lock, flags);
config_to_save = dynamic_sign;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
if (!config_to_save.is_set) {
pr_info("Dynamic sign config not set, skipping save\n");
return;
}
fp = ksu_filp_open_compat(KERNEL_SU_DYNAMIC_SIGN, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (IS_ERR(fp)) {
pr_err("save_dynamic_sign create file failed: %ld\n", PTR_ERR(fp));
return;
}
if (ksu_kernel_write_compat(fp, &magic, sizeof(magic), &off) != sizeof(magic)) {
pr_err("save_dynamic_sign write magic failed.\n");
goto exit;
}
if (ksu_kernel_write_compat(fp, &version, sizeof(version), &off) != sizeof(version)) {
pr_err("save_dynamic_sign write version failed.\n");
goto exit;
}
if (ksu_kernel_write_compat(fp, &config_to_save, sizeof(config_to_save), &off) != sizeof(config_to_save)) {
pr_err("save_dynamic_sign write config failed.\n");
goto exit;
}
pr_info("Dynamic sign config saved successfully\n");
exit:
filp_close(fp, 0);
}
// Loading dynamic signatures from persistent storage
static void do_load_dynamic_sign(struct work_struct *work)
{
loff_t off = 0;
ssize_t ret = 0;
struct file *fp = NULL;
u32 magic;
u32 version;
struct dynamic_sign_config loaded_config;
unsigned long flags;
int i;
fp = ksu_filp_open_compat(KERNEL_SU_DYNAMIC_SIGN, O_RDONLY, 0);
if (IS_ERR(fp)) {
if (PTR_ERR(fp) == -ENOENT) {
pr_info("No saved dynamic sign config found\n");
} else {
pr_err("load_dynamic_sign open file failed: %ld\n", PTR_ERR(fp));
}
return;
}
if (ksu_kernel_read_compat(fp, &magic, sizeof(magic), &off) != sizeof(magic) ||
magic != DYNAMIC_SIGN_FILE_MAGIC) {
pr_err("dynamic sign file invalid magic: %x!\n", magic);
goto exit;
}
if (ksu_kernel_read_compat(fp, &version, sizeof(version), &off) != sizeof(version)) {
pr_err("dynamic sign read version failed\n");
goto exit;
}
pr_info("dynamic sign file version: %d\n", version);
ret = ksu_kernel_read_compat(fp, &loaded_config, sizeof(loaded_config), &off);
if (ret <= 0) {
pr_info("load_dynamic_sign read err: %zd\n", ret);
goto exit;
}
if (ret != sizeof(loaded_config)) {
pr_err("load_dynamic_sign read incomplete config: %zd/%zu\n", ret, sizeof(loaded_config));
goto exit;
}
if (loaded_config.size < 0x100 || loaded_config.size > 0x1000) {
pr_err("Invalid saved config size: 0x%x\n", loaded_config.size);
goto exit;
}
if (strlen(loaded_config.hash) != 64) {
pr_err("Invalid saved config hash length: %zu\n", strlen(loaded_config.hash));
goto exit;
}
for (i = 0; i < 64; i++) {
char c = loaded_config.hash[i];
if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) {
pr_err("Invalid saved config hash character at position %d: %c\n", i, c);
goto exit;
}
}
spin_lock_irqsave(&dynamic_sign_lock, flags);
dynamic_sign = loaded_config;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
pr_info("Dynamic sign config loaded: size=0x%x, hash=%.16s...\n",
loaded_config.size, loaded_config.hash);
exit:
filp_close(fp, 0);
}
static bool persistent_dynamic_sign(void)
{
return ksu_queue_work(&ksu_save_dynamic_sign_work);
}
// Clear dynamic sign config file using the same method as do_save_dynamic_sign
static void do_clear_dynamic_sign_file(struct work_struct *work)
{
loff_t off = 0;
struct file *fp;
char zero_buffer[512];
memset(zero_buffer, 0, sizeof(zero_buffer));
fp = ksu_filp_open_compat(KERNEL_SU_DYNAMIC_SIGN, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (IS_ERR(fp)) {
pr_err("clear_dynamic_sign create file failed: %ld\n", PTR_ERR(fp));
return;
}
// Write null bytes to overwrite the file content
if (ksu_kernel_write_compat(fp, zero_buffer, sizeof(zero_buffer), &off) != sizeof(zero_buffer)) {
pr_err("clear_dynamic_sign write null bytes failed.\n");
} else {
pr_info("Dynamic sign config file cleared successfully\n");
}
filp_close(fp, 0);
}
static bool clear_dynamic_sign_file(void)
{
return ksu_queue_work(&ksu_clear_dynamic_sign_work);
}
int ksu_handle_dynamic_sign(struct dynamic_sign_user_config *config)
{
unsigned long flags;
int ret = 0;
int i;
if (!config) {
return -EINVAL;
}
switch (config->operation) {
case DYNAMIC_SIGN_OP_SET:
if (config->size < 0x100 || config->size > 0x1000) {
pr_err("invalid size: 0x%x\n", config->size);
return -EINVAL;
}
if (strlen(config->hash) != 64) {
pr_err("invalid hash length: %zu\n", strlen(config->hash));
return -EINVAL;
}
for (i = 0; i < 64; i++) {
char c = config->hash[i];
if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) {
pr_err("invalid hash character at position %d: %c\n", i, c);
return -EINVAL;
}
}
spin_lock_irqsave(&dynamic_sign_lock, flags);
dynamic_sign.size = config->size;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0)
strscpy(dynamic_sign.hash, config->hash, sizeof(dynamic_sign.hash));
#else
strlcpy(dynamic_sign.hash, config->hash, sizeof(dynamic_sign.hash));
#endif
dynamic_sign.is_set = 1;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
persistent_dynamic_sign();
pr_info("dynamic sign updated: size=0x%x, hash=%.16s... (multi-manager enabled)\n",
config->size, config->hash);
break;
case DYNAMIC_SIGN_OP_GET:
// Getting Dynamic Signatures
spin_lock_irqsave(&dynamic_sign_lock, flags);
if (dynamic_sign.is_set) {
config->size = dynamic_sign.size;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0)
strscpy(config->hash, dynamic_sign.hash, sizeof(config->hash));
#else
strlcpy(config->hash, dynamic_sign.hash, sizeof(config->hash));
#endif
ret = 0;
} else {
ret = -ENODATA;
}
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
break;
case DYNAMIC_SIGN_OP_CLEAR:
// Clearing dynamic signatures
spin_lock_irqsave(&dynamic_sign_lock, flags);
dynamic_sign.size = 0x300;
strcpy(dynamic_sign.hash, "0000000000000000000000000000000000000000000000000000000000000000");
dynamic_sign.is_set = 0;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
clear_all_managers();
// Clear file using the same method as save
clear_dynamic_sign_file();
pr_info("Dynamic sign config cleared (multi-manager disabled)\n");
break;
default:
pr_err("Invalid dynamic sign operation: %d\n", config->operation);
return -EINVAL;
}
return ret;
}
bool ksu_load_dynamic_sign(void)
{
return ksu_queue_work(&ksu_load_dynamic_sign_work);
}
void ksu_dynamic_sign_init(void)
{
int i;
INIT_WORK(&ksu_save_dynamic_sign_work, do_save_dynamic_sign);
INIT_WORK(&ksu_load_dynamic_sign_work, do_load_dynamic_sign);
INIT_WORK(&ksu_clear_dynamic_sign_work, do_clear_dynamic_sign_file);
for (i = 0; i < MAX_MANAGERS; i++) {
active_managers[i].is_active = false;
}
pr_info("Dynamic sign initialized with conditional multi-manager support\n");
}
void ksu_dynamic_sign_exit(void)
{
clear_all_managers();
do_save_dynamic_sign(NULL);
pr_info("Dynamic sign exited with persistent storage\n");
}
// Get active managers for multi-manager APKs
int ksu_get_active_managers(struct manager_list_info *info)
{
unsigned long flags;
int i, count = 0;
if (!info) {
return -EINVAL;
}
if (ksu_manager_uid != KSU_INVALID_UID && count < 2) {
info->managers[count].uid = ksu_manager_uid;
info->managers[count].signature_index = 0;
count++;
}
if (is_dynamic_sign_enabled()) {
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS && count < 2; i++) {
if (active_managers[i].is_active) {
info->managers[count].uid = active_managers[i].uid;
info->managers[count].signature_index = active_managers[i].signature_index;
count++;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
}
info->count = count;
return 0;
}
struct sdesc { struct sdesc {
struct shash_desc shash; struct shash_desc shash;
char ctx[]; char ctx[];
@@ -623,13 +163,12 @@ static int verify_signature_block(struct file *fp, u32 *size4, loff_t *pos, u32
sign_key = apk_sign_keys[i]; sign_key = apk_sign_keys[i];
if (i == 1) { // Dynamic Sign indexing if (i == 1) { // Dynamic Sign indexing
unsigned long flags; unsigned int size;
spin_lock_irqsave(&dynamic_sign_lock, flags); const char *hash;
if (dynamic_sign.is_set) { if (ksu_get_dynamic_sign_config(&size, &hash)) {
sign_key.size = dynamic_sign.size; sign_key.size = size;
sign_key.sha256 = dynamic_sign.hash; sign_key.sha256 = hash;
} }
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
} }
if (*size4 != sign_key.size) if (*size4 != sign_key.size)
@@ -690,8 +229,8 @@ static int parse_apk_signature(char *path, bool check_multi_manager, int *signat
return -1; return -1;
} }
// If you want to check for multi-manager APK signing, but dynamic signing is not enabled, skip the // If you want to check for multi-manager APK signing, but dynamic signing is not enabled, skip
if (check_multi_manager && !is_dynamic_sign_enabled()) { if (check_multi_manager && !ksu_is_dynamic_sign_enabled()) {
filp_close(fp, 0); filp_close(fp, 0);
return 0; return 0;
} }
@@ -819,12 +358,6 @@ bool ksu_is_multi_manager_apk(char *path, int *signature_index)
return result == 1; return result == 1;
} }
static bool check_block(struct file *fp, u32 *size4, loff_t *pos, u32 *offset)
{
int result = verify_signature_block(fp, size4, pos, offset, NULL);
return result == 1;
}
static __always_inline bool check_v2_signature(char *path) static __always_inline bool check_v2_signature(char *path)
{ {
int result = parse_apk_signature(path, false, NULL); int result = parse_apk_signature(path, false, NULL);

26
kernel/apk_sign.h
View File

@@ -3,32 +3,10 @@
#include <linux/types.h> #include <linux/types.h>
#include "ksu.h" #include "ksu.h"
#include "manager.h"
bool is_manager_apk(char *path); bool is_manager_apk(char *path);
struct dynamic_sign_config { // Get dynamic sign configuration for signature verification
unsigned int size; bool ksu_get_dynamic_sign_config(unsigned int *size, const char **hash);
char hash[65];
int is_set;
};
struct manager_info {
uid_t uid;
int signature_index;
bool is_active;
};
bool ksu_is_multi_manager_apk(char *path, int *signature_index);
void ksu_add_manager(uid_t uid, int signature_index);
void ksu_remove_manager(uid_t uid);
bool ksu_is_any_manager(uid_t uid);
int ksu_get_manager_signature_index(uid_t uid);
int ksu_get_active_managers(struct manager_list_info *info);
int ksu_handle_dynamic_sign(struct dynamic_sign_user_config *config);
void ksu_dynamic_sign_init(void);
void ksu_dynamic_sign_exit(void);
bool ksu_load_dynamic_sign(void);
#endif #endif

501
kernel/dynamic_sign.c Normal file
View File

@@ -0,0 +1,501 @@
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <linux/workqueue.h>
#ifdef CONFIG_KSU_DEBUG
#include <linux/moduleparam.h>
#endif
#include <crypto/hash.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 11, 0)
#include <crypto/sha2.h>
#else
#include <crypto/sha.h>
#endif
#include "dynamic_sign.h"
#include "klog.h" // IWYU pragma: keep
#include "kernel_compat.h"
#include "manager.h"
#define MAX_MANAGERS 2
// Dynamic sign configuration
static struct dynamic_sign_config dynamic_sign = {
.size = 0x300,
.hash = "0000000000000000000000000000000000000000000000000000000000000000",
.is_set = 0
};
// Multi-manager state
static struct manager_info active_managers[MAX_MANAGERS];
static DEFINE_SPINLOCK(managers_lock);
static DEFINE_SPINLOCK(dynamic_sign_lock);
// Work queues for persistent storage
static struct work_struct ksu_save_dynamic_sign_work;
static struct work_struct ksu_load_dynamic_sign_work;
static struct work_struct ksu_clear_dynamic_sign_work;
bool ksu_is_dynamic_sign_enabled(void)
{
unsigned long flags;
bool enabled;
spin_lock_irqsave(&dynamic_sign_lock, flags);
enabled = dynamic_sign.is_set;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
return enabled;
}
void ksu_add_manager(uid_t uid, int signature_index)
{
unsigned long flags;
int i;
if (!ksu_is_dynamic_sign_enabled()) {
pr_info("Dynamic sign not enabled, skipping multi-manager add\n");
return;
}
spin_lock_irqsave(&managers_lock, flags);
// Check if manager already exists and update
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active && active_managers[i].uid == uid) {
active_managers[i].signature_index = signature_index;
spin_unlock_irqrestore(&managers_lock, flags);
pr_info("Updated manager uid=%d, signature_index=%d\n", uid, signature_index);
return;
}
}
// Find free slot for new manager
for (i = 0; i < MAX_MANAGERS; i++) {
if (!active_managers[i].is_active) {
active_managers[i].uid = uid;
active_managers[i].signature_index = signature_index;
active_managers[i].is_active = true;
spin_unlock_irqrestore(&managers_lock, flags);
pr_info("Added manager uid=%d, signature_index=%d\n", uid, signature_index);
return;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
pr_warn("Failed to add manager, no free slots\n");
}
void ksu_remove_manager(uid_t uid)
{
unsigned long flags;
int i;
if (!ksu_is_dynamic_sign_enabled()) {
return;
}
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active && active_managers[i].uid == uid) {
active_managers[i].is_active = false;
pr_info("Removed manager uid=%d\n", uid);
break;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
}
bool ksu_is_any_manager(uid_t uid)
{
unsigned long flags;
bool is_manager = false;
int i;
if (!ksu_is_dynamic_sign_enabled()) {
return false;
}
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active && active_managers[i].uid == uid) {
is_manager = true;
break;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
return is_manager;
}
int ksu_get_manager_signature_index(uid_t uid)
{
unsigned long flags;
int signature_index = -1;
int i;
// Check traditional manager first
if (ksu_manager_uid != KSU_INVALID_UID && uid == ksu_manager_uid) {
return 1;
}
if (!ksu_is_dynamic_sign_enabled()) {
return -1;
}
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active && active_managers[i].uid == uid) {
signature_index = active_managers[i].signature_index;
break;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
return signature_index;
}
static void clear_all_managers(void)
{
unsigned long flags;
int i;
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS; i++) {
if (active_managers[i].is_active) {
pr_info("Clearing manager uid=%d due to dynamic_sign disable\n",
active_managers[i].uid);
active_managers[i].is_active = false;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
}
int ksu_get_active_managers(struct manager_list_info *info)
{
unsigned long flags;
int i, count = 0;
if (!info) {
return -EINVAL;
}
// Add traditional manager first
if (ksu_manager_uid != KSU_INVALID_UID && count < 2) {
info->managers[count].uid = ksu_manager_uid;
info->managers[count].signature_index = 0;
count++;
}
// Add dynamic managers
if (ksu_is_dynamic_sign_enabled()) {
spin_lock_irqsave(&managers_lock, flags);
for (i = 0; i < MAX_MANAGERS && count < 2; i++) {
if (active_managers[i].is_active) {
info->managers[count].uid = active_managers[i].uid;
info->managers[count].signature_index = active_managers[i].signature_index;
count++;
}
}
spin_unlock_irqrestore(&managers_lock, flags);
}
info->count = count;
return 0;
}
static void do_save_dynamic_sign(struct work_struct *work)
{
u32 magic = DYNAMIC_SIGN_FILE_MAGIC;
u32 version = DYNAMIC_SIGN_FILE_VERSION;
struct dynamic_sign_config config_to_save;
loff_t off = 0;
unsigned long flags;
struct file *fp;
spin_lock_irqsave(&dynamic_sign_lock, flags);
config_to_save = dynamic_sign;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
if (!config_to_save.is_set) {
pr_info("Dynamic sign config not set, skipping save\n");
return;
}
fp = ksu_filp_open_compat(KERNEL_SU_DYNAMIC_SIGN, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (IS_ERR(fp)) {
pr_err("save_dynamic_sign create file failed: %ld\n", PTR_ERR(fp));
return;
}
if (ksu_kernel_write_compat(fp, &magic, sizeof(magic), &off) != sizeof(magic)) {
pr_err("save_dynamic_sign write magic failed.\n");
goto exit;
}
if (ksu_kernel_write_compat(fp, &version, sizeof(version), &off) != sizeof(version)) {
pr_err("save_dynamic_sign write version failed.\n");
goto exit;
}
if (ksu_kernel_write_compat(fp, &config_to_save, sizeof(config_to_save), &off) != sizeof(config_to_save)) {
pr_err("save_dynamic_sign write config failed.\n");
goto exit;
}
pr_info("Dynamic sign config saved successfully\n");
exit:
filp_close(fp, 0);
}
static void do_load_dynamic_sign(struct work_struct *work)
{
loff_t off = 0;
ssize_t ret = 0;
struct file *fp = NULL;
u32 magic;
u32 version;
struct dynamic_sign_config loaded_config;
unsigned long flags;
int i;
fp = ksu_filp_open_compat(KERNEL_SU_DYNAMIC_SIGN, O_RDONLY, 0);
if (IS_ERR(fp)) {
if (PTR_ERR(fp) == -ENOENT) {
pr_info("No saved dynamic sign config found\n");
} else {
pr_err("load_dynamic_sign open file failed: %ld\n", PTR_ERR(fp));
}
return;
}
if (ksu_kernel_read_compat(fp, &magic, sizeof(magic), &off) != sizeof(magic) ||
magic != DYNAMIC_SIGN_FILE_MAGIC) {
pr_err("dynamic sign file invalid magic: %x!\n", magic);
goto exit;
}
if (ksu_kernel_read_compat(fp, &version, sizeof(version), &off) != sizeof(version)) {
pr_err("dynamic sign read version failed\n");
goto exit;
}
pr_info("dynamic sign file version: %d\n", version);
ret = ksu_kernel_read_compat(fp, &loaded_config, sizeof(loaded_config), &off);
if (ret <= 0) {
pr_info("load_dynamic_sign read err: %zd\n", ret);
goto exit;
}
if (ret != sizeof(loaded_config)) {
pr_err("load_dynamic_sign read incomplete config: %zd/%zu\n", ret, sizeof(loaded_config));
goto exit;
}
if (loaded_config.size < 0x100 || loaded_config.size > 0x1000) {
pr_err("Invalid saved config size: 0x%x\n", loaded_config.size);
goto exit;
}
if (strlen(loaded_config.hash) != 64) {
pr_err("Invalid saved config hash length: %zu\n", strlen(loaded_config.hash));
goto exit;
}
// Validate hash format
for (i = 0; i < 64; i++) {
char c = loaded_config.hash[i];
if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) {
pr_err("Invalid saved config hash character at position %d: %c\n", i, c);
goto exit;
}
}
spin_lock_irqsave(&dynamic_sign_lock, flags);
dynamic_sign = loaded_config;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
pr_info("Dynamic sign config loaded: size=0x%x, hash=%.16s...\n",
loaded_config.size, loaded_config.hash);
exit:
filp_close(fp, 0);
}
static bool persistent_dynamic_sign(void)
{
return ksu_queue_work(&ksu_save_dynamic_sign_work);
}
static void do_clear_dynamic_sign_file(struct work_struct *work)
{
loff_t off = 0;
struct file *fp;
char zero_buffer[512];
memset(zero_buffer, 0, sizeof(zero_buffer));
fp = ksu_filp_open_compat(KERNEL_SU_DYNAMIC_SIGN, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (IS_ERR(fp)) {
pr_err("clear_dynamic_sign create file failed: %ld\n", PTR_ERR(fp));
return;
}
// Write null bytes to overwrite the file content
if (ksu_kernel_write_compat(fp, zero_buffer, sizeof(zero_buffer), &off) != sizeof(zero_buffer)) {
pr_err("clear_dynamic_sign write null bytes failed.\n");
} else {
pr_info("Dynamic sign config file cleared successfully\n");
}
filp_close(fp, 0);
}
static bool clear_dynamic_sign_file(void)
{
return ksu_queue_work(&ksu_clear_dynamic_sign_work);
}
int ksu_handle_dynamic_sign(struct dynamic_sign_user_config *config)
{
unsigned long flags;
int ret = 0;
int i;
if (!config) {
return -EINVAL;
}
switch (config->operation) {
case DYNAMIC_SIGN_OP_SET:
if (config->size < 0x100 || config->size > 0x1000) {
pr_err("invalid size: 0x%x\n", config->size);
return -EINVAL;
}
if (strlen(config->hash) != 64) {
pr_err("invalid hash length: %zu\n", strlen(config->hash));
return -EINVAL;
}
// Validate hash format
for (i = 0; i < 64; i++) {
char c = config->hash[i];
if (!((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'))) {
pr_err("invalid hash character at position %d: %c\n", i, c);
return -EINVAL;
}
}
spin_lock_irqsave(&dynamic_sign_lock, flags);
dynamic_sign.size = config->size;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0)
strscpy(dynamic_sign.hash, config->hash, sizeof(dynamic_sign.hash));
#else
strlcpy(dynamic_sign.hash, config->hash, sizeof(dynamic_sign.hash));
#endif
dynamic_sign.is_set = 1;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
persistent_dynamic_sign();
pr_info("dynamic sign updated: size=0x%x, hash=%.16s... (multi-manager enabled)\n",
config->size, config->hash);
break;
case DYNAMIC_SIGN_OP_GET:
spin_lock_irqsave(&dynamic_sign_lock, flags);
if (dynamic_sign.is_set) {
config->size = dynamic_sign.size;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0)
strscpy(config->hash, dynamic_sign.hash, sizeof(config->hash));
#else
strlcpy(config->hash, dynamic_sign.hash, sizeof(config->hash));
#endif
ret = 0;
} else {
ret = -ENODATA;
}
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
break;
case DYNAMIC_SIGN_OP_CLEAR:
spin_lock_irqsave(&dynamic_sign_lock, flags);
dynamic_sign.size = 0x300;
strcpy(dynamic_sign.hash, "0000000000000000000000000000000000000000000000000000000000000000");
dynamic_sign.is_set = 0;
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
clear_all_managers();
// Clear file using the same method as save
clear_dynamic_sign_file();
pr_info("Dynamic sign config cleared (multi-manager disabled)\n");
break;
default:
pr_err("Invalid dynamic sign operation: %d\n", config->operation);
return -EINVAL;
}
return ret;
}
bool ksu_load_dynamic_sign(void)
{
return ksu_queue_work(&ksu_load_dynamic_sign_work);
}
void ksu_dynamic_sign_init(void)
{
int i;
INIT_WORK(&ksu_save_dynamic_sign_work, do_save_dynamic_sign);
INIT_WORK(&ksu_load_dynamic_sign_work, do_load_dynamic_sign);
INIT_WORK(&ksu_clear_dynamic_sign_work, do_clear_dynamic_sign_file);
// Initialize manager slots
for (i = 0; i < MAX_MANAGERS; i++) {
active_managers[i].is_active = false;
}
pr_info("Dynamic sign initialized with conditional multi-manager support\n");
}
void ksu_dynamic_sign_exit(void)
{
clear_all_managers();
// Save current config before exit
do_save_dynamic_sign(NULL);
pr_info("Dynamic sign exited with persistent storage\n");
}
// Get dynamic sign configuration for signature verification
bool ksu_get_dynamic_sign_config(unsigned int *size, const char **hash)
{
unsigned long flags;
bool valid = false;
spin_lock_irqsave(&dynamic_sign_lock, flags);
if (dynamic_sign.is_set) {
if (size) *size = dynamic_sign.size;
if (hash) *hash = dynamic_sign.hash;
valid = true;
}
spin_unlock_irqrestore(&dynamic_sign_lock, flags);
return valid;
}

40
kernel/dynamic_sign.h Normal file
View File

@@ -0,0 +1,40 @@
#ifndef __KSU_H_DYNAMIC_SIGN
#define __KSU_H_DYNAMIC_SIGN
#include <linux/types.h>
#include "ksu.h"
#define DYNAMIC_SIGN_FILE_MAGIC 0x7f445347 // 'DSG', u32
#define DYNAMIC_SIGN_FILE_VERSION 1 // u32
#define KERNEL_SU_DYNAMIC_SIGN "/data/adb/ksu/.dynamic_sign"
struct dynamic_sign_config {
unsigned int size;
char hash[65];
int is_set;
};
struct manager_info {
uid_t uid;
int signature_index;
bool is_active;
};
// Dynamic sign operations
int ksu_handle_dynamic_sign(struct dynamic_sign_user_config *config);
void ksu_dynamic_sign_init(void);
void ksu_dynamic_sign_exit(void);
bool ksu_load_dynamic_sign(void);
bool ksu_is_dynamic_sign_enabled(void);
// Multi-manager operations
void ksu_add_manager(uid_t uid, int signature_index);
void ksu_remove_manager(uid_t uid);
bool ksu_is_any_manager(uid_t uid);
int ksu_get_manager_signature_index(uid_t uid);
int ksu_get_active_managers(struct manager_list_info *info);
// Multi-manager APK verification
bool ksu_is_multi_manager_apk(char *path, int *signature_index);
#endif