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fix: sucompat (#2874)

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Co-authored-by: Wang Han <416810799@qq.com>
This commit is contained in:
Ylarod
2025-11-06 20:43:33 +08:00
committed by ShirkNeko
parent 7f9048724f
commit cf50be122e
1 changed files with 122 additions and 29 deletions
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149
kernel/sucompat.c
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@@ -31,6 +31,54 @@
#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)
{
@@ -388,46 +436,87 @@ static void destroy_kprobe(struct kprobe **kp_ptr)
static struct kprobe *pts_kp = NULL;
#endif
void ksu_mark_running_process()
#ifdef CONFIG_KRETPROBES
static int tracepoint_reg_count = 0;
static int syscall_regfunc_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
struct task_struct *p, *t;
read_lock(&tasklist_lock);
for_each_process_thread (p, t) {
if (!t->mm) { // only user processes
continue;
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();
}
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);
tracepoint_reg_count++;
return 0;
}
static void unmark_all_process()
static int syscall_unregfunc_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
struct task_struct *p, *t;
read_lock(&tasklist_lock);
for_each_process_thread (p, t) {
ksu_clear_task_tracepoint_flag(t);
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();
}
read_unlock(&tasklist_lock);
pr_info("sucompat: unmark all user process done!\n");
tracepoint_reg_count--;
return 0;
}
struct kretprobe syscall_regfunc_rp = {
.kp.symbol_name = "syscall_regfunc",
.handler = syscall_regfunc_handler,
.entry_handler = NULL,
.data_size = 0,
.maxactive = 0,
};
struct kretprobe syscall_unregfunc_rp = {
.kp.symbol_name = "syscall_unregfunc",
.handler = syscall_unregfunc_handler,
.entry_handler = NULL,
.data_size = 0,
.maxactive = 0,
};
#endif
void ksu_sucompat_enable()
{
int ret;
pr_info("sucompat: ksu_sucompat_enable called\n");
#ifdef KSU_KPROBES_HOOK
// Register kprobe for pts_unix98_lookup
pts_kp = init_kprobe("pts_unix98_lookup", pts_unix98_lookup_pre);
#endif
#ifdef CONFIG_KRETPROBES
ret = register_kretprobe(&syscall_regfunc_rp);
if (ret) {
pr_err("sucompat: failed to register syscall_regfunc kretprobe: %d\n", ret);
} else {
pr_info("sucompat: syscall_regfunc kretprobe registered\n");
}
ret = register_kretprobe(&syscall_unregfunc_rp);
if (ret) {
pr_err("sucompat: failed to register syscall_unregfunc kretprobe: %d\n", ret);
} else {
pr_info("sucompat: syscall_unregfunc kretprobe registered\n");
}
#endif
#ifdef KSU_HAVE_SYSCALL_TRACEPOINTS_HOOK
// Register sys_enter tracepoint for syscall interception
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 {
@@ -437,11 +526,6 @@ void ksu_sucompat_enable()
ksu_sucompat_hook_state = true;
pr_info("ksu_sucompat_init: hooks enabled: execve/execveat_su, faccessat, stat\n");
#endif
#ifdef KSU_KPROBES_HOOK
// Register kprobe for pts_unix98_lookup
pts_kp = init_kprobe("pts_unix98_lookup", pts_unix98_lookup_pre);
#endif
}
void ksu_sucompat_disable()
@@ -457,6 +541,15 @@ void ksu_sucompat_disable()
pr_info("ksu_sucompat_exit: hooks disabled: execve/execveat_su, faccessat, stat\n");
#endif
#ifdef CONFIG_KRETPROBES
// Unregister syscall_regfunc kretprobe
unregister_kretprobe(&syscall_regfunc_rp);
pr_info("sucompat: syscall_regfunc kretprobe unregistered\n");
// Unregister syscall_unregfunc kretprobe
unregister_kretprobe(&syscall_unregfunc_rp);
pr_info("sucompat: syscall_unregfunc kretprobe unregistered\n");
#endif
#ifdef KSU_KPROBES_HOOK
// Unregister pts_unix98_lookup kprobe
destroy_kprobe(&pts_kp);