android/SukiSU-Ultra
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kernel: Rewrite the kernel source code (#554)

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* clean unused header

* on_module_mounted in ksud.c

* refact: use app_profile

* unified hook manager

* add zygote to hook target

* move reboot hook to supercall.c

* refactor: kernel_umount setuid_hook

* update mark rules, add init mark tracker

* remove reboot from check_syscall_fastpath

* update setuid_hook, remove uneeded sucompat enable

* log freely

* kernel: Migrate kprobe hook configuration items

* kernel: fix build

* cli: add ksud debug mark

* Fix rustfmt warning

---------

Co-authored-by: Ylarod <me@ylarod.cn>
Co-authored-by: Wang Han <416810799@qq.com>
Co-authored-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>
This commit is contained in:
ShirkNeko
2025-11-09 01:14:26 +08:00
committed by GitHub
parent 46b9f5fb4b
commit 548258f922
32 changed files with 1782 additions and 1282 deletions
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268
kernel/sucompat.c
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@@ -1,85 +1,30 @@
#include "linux/compiler.h"
#include "linux/printk.h"
#include "linux/sched.h"
#include "selinux/selinux.h"
#include <linux/dcache.h>
#include <linux/security.h>
#include <asm/current.h>
#include <linux/cred.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/kprobes.h>
#include <linux/tracepoint.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/version.h>
#include <linux/spinlock.h>
#include <linux/sched/task_stack.h>
#include <asm/syscall.h>
#include <trace/events/syscalls.h>
#include <linux/ptrace.h>
#include "objsec.h"
#include "allowlist.h"
#include "arch.h"
#include "feature.h"
#include "klog.h" // IWYU pragma: keep
#include "ksud.h"
#include "sucompat.h"
#include "core_hook.h"
#include "app_profile.h"
#include "syscall_hook_manager.h"
#include "sulog.h"
#include "kprobe_hook_manager.h"
#define SU_PATH "/system/bin/su"
#define SH_PATH "/system/bin/sh"
bool ksu_su_compat_enabled __read_mostly = true;
extern void escape_to_root();
void ksu_sucompat_enable();
void ksu_sucompat_disable();
void ksu_mark_running_process(void)
{
struct task_struct *p, *t;
read_lock(&tasklist_lock);
for_each_process_thread (p, t) {
if (!t->mm) { // only user processes
continue;
}
int uid = task_uid(t).val;
bool ksu_root_process =
uid == 0 && is_task_ksu_domain(get_task_cred(t));
if (ksu_root_process || ksu_is_allow_uid(uid)) {
ksu_set_task_tracepoint_flag(t);
pr_info("sucompat: mark process: pid:%d, uid: %d, comm:%s\n",
t->pid, uid, t->comm);
}
}
read_unlock(&tasklist_lock);
}
static void handle_process_mark(bool mark)
{
struct task_struct *p, *t;
read_lock(&tasklist_lock);
for_each_process_thread(p, t) {
if (mark)
ksu_set_task_tracepoint_flag(t);
else
ksu_clear_task_tracepoint_flag(t);
}
read_unlock(&tasklist_lock);
}
static void mark_all_process(void)
{
handle_process_mark(true);
pr_info("sucompat: mark all user process done!\n");
}
static void unmark_all_process(void)
{
handle_process_mark(false);
pr_info("sucompat: unmark all user process done!\n");
}
static int su_compat_feature_get(u64 *value)
{
@@ -90,21 +35,8 @@ static int su_compat_feature_get(u64 *value)
static int su_compat_feature_set(u64 value)
{
bool enable = value != 0;
if (enable == ksu_su_compat_enabled) {
pr_info("su_compat: no need to change\n");
return 0;
}
if (enable) {
ksu_sucompat_enable();
} else {
ksu_sucompat_disable();
}
ksu_su_compat_enabled = enable;
pr_info("su_compat: set to %d\n", enable);
return 0;
}
@@ -115,10 +47,6 @@ static const struct ksu_feature_handler su_compat_handler = {
.set_handler = su_compat_feature_set,
};
#ifndef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
static bool ksu_sucompat_hook_state __read_mostly = true;
#endif
static void __user *userspace_stack_buffer(const void *d, size_t len)
{
/* To avoid having to mmap a page in userspace, just write below the stack
@@ -148,7 +76,7 @@ int ksu_handle_faccessat(int *dfd, const char __user **filename_user, int *mode,
const char su[] = SU_PATH;
#ifndef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
if (!ksu_sucompat_hook_state) {
if (!ksu_su_compat_enabled) {
return 0;
}
#endif
@@ -178,7 +106,7 @@ int ksu_handle_stat(int *dfd, const char __user **filename_user, int *flags)
const char su[] = SU_PATH;
#ifndef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
if (!ksu_sucompat_hook_state) {
if (!ksu_su_compat_enabled) {
return 0;
}
#endif
@@ -230,7 +158,7 @@ int ksu_handle_execveat_sucompat(int *fd, struct filename **filename_ptr,
const char su[] = SU_PATH;
#ifndef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
if (!ksu_sucompat_hook_state) {
if (!ksu_su_compat_enabled) {
return 0;
}
#endif
@@ -263,7 +191,7 @@ int ksu_handle_execveat_sucompat(int *fd, struct filename **filename_ptr,
pr_info("do_execveat_common su found\n");
memcpy((void *)filename->name, sh, sizeof(sh));
escape_to_root();
escape_with_root_profile();
return 0;
}
@@ -282,7 +210,7 @@ int ksu_handle_execve_sucompat(int *fd, const char __user **filename_user,
char path[sizeof(su) + 1];
#ifndef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
if (!ksu_sucompat_hook_state){
if (!ksu_su_compat_enabled){
return 0;
}
#endif
@@ -312,7 +240,7 @@ int ksu_handle_execve_sucompat(int *fd, const char __user **filename_user,
pr_info("sys_execve su found\n");
*filename_user = ksud_user_path();
escape_to_root();
escape_with_root_profile();
return 0;
}
@@ -321,7 +249,7 @@ int __ksu_handle_devpts(struct inode *inode)
{
#ifndef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
if (!ksu_sucompat_hook_state)
if (!ksu_su_compat_enabled)
return 0;
#endif
@@ -346,185 +274,15 @@ int __ksu_handle_devpts(struct inode *inode)
return 0;
}
#ifdef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
// Tracepoint probe for sys_enter
static void sucompat_sys_enter_handler(void *data, struct pt_regs *regs,
long id)
{
// Handle newfstatat
if (unlikely(id == __NR_newfstatat)) {
int *dfd = (int *)&PT_REGS_PARM1(regs);
const char __user **filename_user =
(const char __user **)&PT_REGS_PARM2(regs);
int *flags = (int *)&PT_REGS_SYSCALL_PARM4(regs);
ksu_handle_stat(dfd, filename_user, flags);
return;
}
// Handle faccessat
if (unlikely(id == __NR_faccessat)) {
int *dfd = (int *)&PT_REGS_PARM1(regs);
const char __user **filename_user =
(const char __user **)&PT_REGS_PARM2(regs);
int *mode = (int *)&PT_REGS_PARM3(regs);
ksu_handle_faccessat(dfd, filename_user, mode, NULL);
return;
}
// Handle execve
if (unlikely(id == __NR_execve)) {
const char __user **filename_user =
(const char __user **)&PT_REGS_PARM1(regs);
ksu_handle_execve_sucompat(AT_FDCWD, filename_user, NULL, NULL, NULL);
return;
}
}
#endif // KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
#ifdef CONFIG_KRETPROBES
static struct kretprobe *init_kretprobe(const char *name,
kretprobe_handler_t handler)
{
struct kretprobe *rp = kzalloc(sizeof(struct kretprobe), GFP_KERNEL);
if (!rp)
return NULL;
rp->kp.symbol_name = name;
rp->handler = handler;
rp->data_size = 0;
rp->maxactive = 0;
int ret = register_kretprobe(rp);
pr_info("sucompat: register_%s kretprobe: %d\n", name, ret);
if (ret) {
kfree(rp);
return NULL;
}
return rp;
}
static void destroy_kretprobe(struct kretprobe **rp_ptr)
{
struct kretprobe *rp = *rp_ptr;
if (!rp)
return;
unregister_kretprobe(rp);
synchronize_rcu();
kfree(rp);
*rp_ptr = NULL;
}
#endif
#ifdef CONFIG_KRETPROBES
static int tracepoint_reg_count = 0;
static DEFINE_SPINLOCK(tracepoint_reg_lock);
static int syscall_regfunc_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
unsigned long flags;
spin_lock_irqsave(&tracepoint_reg_lock, flags);
if (tracepoint_reg_count < 1) {
// while install our tracepoint, mark our processes
unmark_all_process();
ksu_mark_running_process();
} else {
// while installing other tracepoint, mark all processes
mark_all_process();
}
tracepoint_reg_count++;
spin_unlock_irqrestore(&tracepoint_reg_lock, flags);
return 0;
}
static int syscall_unregfunc_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
unsigned long flags;
spin_lock_irqsave(&tracepoint_reg_lock, flags);
if (tracepoint_reg_count <= 1) {
// while uninstall our tracepoint, unmark all processes
unmark_all_process();
} else {
// while uninstalling other tracepoint, mark our processes
unmark_all_process();
ksu_mark_running_process();
}
tracepoint_reg_count--;
spin_unlock_irqrestore(&tracepoint_reg_lock, flags);
return 0;
}
static struct kretprobe *syscall_regfunc_rp = NULL;
static struct kretprobe *syscall_unregfunc_rp = NULL;
#endif
void ksu_sucompat_enable()
{
int ret;
pr_info("sucompat: ksu_sucompat_enable called\n");
#ifdef CONFIG_KRETPROBES
// Register kretprobe for syscall_regfunc
syscall_regfunc_rp = init_kretprobe("syscall_regfunc", syscall_regfunc_handler);
// Register kretprobe for syscall_unregfunc
syscall_unregfunc_rp = init_kretprobe("syscall_unregfunc", syscall_unregfunc_handler);
#endif
#ifdef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
ret = register_trace_sys_enter(sucompat_sys_enter_handler, NULL);
#ifndef CONFIG_KRETPROBES
unmark_all_process();
ksu_mark_running_process();
#endif
if (ret) {
pr_err("sucompat: failed to register sys_enter tracepoint: %d\n", ret);
} else {
pr_info("sucompat: sys_enter tracepoint registered\n");
}
#else
ksu_sucompat_hook_state = true;
pr_info("ksu_sucompat_init: hooks enabled: execve/execveat_su, faccessat, stat\n");
#endif
}
void ksu_sucompat_disable()
{
pr_info("sucompat: ksu_sucompat_disable called\n");
#ifdef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
unregister_trace_sys_enter(sucompat_sys_enter_handler, NULL);
tracepoint_synchronize_unregister();
pr_info("sucompat: sys_enter tracepoint unregistered\n");
#else
ksu_sucompat_hook_state = false;
pr_info("ksu_sucompat_exit: hooks disabled: execve/execveat_su, faccessat, stat\n");
#endif
#ifdef CONFIG_KRETPROBES
destroy_kretprobe(&syscall_regfunc_rp);
destroy_kretprobe(&syscall_unregfunc_rp);
#endif
}
// sucompat: permited process can execute 'su' to gain root access.
void ksu_sucompat_init()
{
if (ksu_register_feature_handler(&su_compat_handler)) {
pr_err("Failed to register su_compat feature handler\n");
}
if (ksu_su_compat_enabled) {
ksu_sucompat_enable();
}
}
void ksu_sucompat_exit()
{
if (ksu_su_compat_enabled) {
ksu_sucompat_disable();
}
ksu_unregister_feature_handler(KSU_FEATURE_SU_COMPAT);
}