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kernel: Allow to re-enable sucompat

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This commit is contained in:
weishu 2025-02-16 21:33:26 +08:00
parent 9bb39ff760
commit 4593ae81c7
2 changed files with 45 additions and 39 deletions
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81
kernel/sucompat.c
View File

@ -191,7 +191,7 @@ int ksu_handle_devpts(struct inode *inode)
#ifdef CONFIG_KPROBES
static int sys_faccessat_handler_pre(struct kprobe *p, struct pt_regs *regs)
static int faccessat_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct pt_regs *real_regs = PT_REAL_REGS(regs);
int *dfd = (int *)&PT_REGS_PARM1(real_regs);
@ -202,17 +202,18 @@ static int sys_faccessat_handler_pre(struct kprobe *p, struct pt_regs *regs)
return ksu_handle_faccessat(dfd, filename_user, mode, NULL);
}
static int sys_newfstatat_handler_pre(struct kprobe *p, struct pt_regs *regs)
static int newfstatat_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct pt_regs *real_regs = PT_REAL_REGS(regs);
int *dfd = (int *)&PT_REGS_PARM1(real_regs);
const char __user **filename_user = (const char **)&PT_REGS_PARM2(real_regs);
const char __user **filename_user =
(const char **)&PT_REGS_PARM2(real_regs);
int *flags = (int *)&PT_REGS_SYSCALL_PARM4(real_regs);
return ksu_handle_stat(dfd, filename_user, flags);
}
static int sys_execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
static int execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
{
struct pt_regs *real_regs = PT_REAL_REGS(regs);
const char __user **filename_user =
@ -222,21 +223,6 @@ static int sys_execve_handler_pre(struct kprobe *p, struct pt_regs *regs)
NULL);
}
static struct kprobe faccessat_kp = {
.symbol_name = SYS_FACCESSAT_SYMBOL,
.pre_handler = sys_faccessat_handler_pre,
};
static struct kprobe newfstatat_kp = {
.symbol_name = SYS_NEWFSTATAT_SYMBOL,
.pre_handler = sys_newfstatat_handler_pre,
};
static struct kprobe execve_kp = {
.symbol_name = SYS_EXECVE_SYMBOL,
.pre_handler = sys_execve_handler_pre,
};
static int pts_unix98_lookup_pre(struct kprobe *p, struct pt_regs *regs)
{
struct inode *inode;
@ -246,35 +232,56 @@ static int pts_unix98_lookup_pre(struct kprobe *p, struct pt_regs *regs)
return ksu_handle_devpts(inode);
}
static struct kprobe pts_unix98_lookup_kp = { .symbol_name =
"pts_unix98_lookup",
.pre_handler =
pts_unix98_lookup_pre };
#endif
static struct kprobe *init_kprobe(const char *name,
kprobe_pre_handler_t handler)
{
struct kprobe *kp = kzalloc(sizeof(struct kprobe), GFP_KERNEL);
if (!kp)
return NULL;
kp->symbol_name = name;
kp->pre_handler = handler;
int ret = register_kprobe(kp);
pr_info("sucompat: register_%s kprobe: %d\n", name, ret);
if (ret) {
kfree(kp);
return NULL;
}
return kp;
}
static void destroy_kprobe(struct kprobe **kp_ptr)
{
struct kprobe *kp = *kp_ptr;
if (!kp)
return;
unregister_kprobe(kp);
synchronize_rcu();
kfree(kp);
*kp_ptr = NULL;
}
static struct kprobe *su_kps[4];
// sucompat: permited process can execute 'su' to gain root access.
void ksu_sucompat_init()
{
#ifdef CONFIG_KPROBES
int ret;
ret = register_kprobe(&execve_kp);
pr_info("sucompat: execve_kp: %d\n", ret);
ret = register_kprobe(&newfstatat_kp);
pr_info("sucompat: newfstatat_kp: %d\n", ret);
ret = register_kprobe(&faccessat_kp);
pr_info("sucompat: faccessat_kp: %d\n", ret);
ret = register_kprobe(&pts_unix98_lookup_kp);
pr_info("sucompat: devpts_kp: %d\n", ret);
su_kps[0] = init_kprobe(SYS_EXECVE_SYMBOL, execve_handler_pre);
su_kps[1] = init_kprobe(SYS_FACCESSAT_SYMBOL, faccessat_handler_pre);
su_kps[2] = init_kprobe(SYS_NEWFSTATAT_SYMBOL, newfstatat_handler_pre);
su_kps[3] = init_kprobe("pts_unix98_lookup", pts_unix98_lookup_pre);
#endif
}
void ksu_sucompat_exit()
{
#ifdef CONFIG_KPROBES
unregister_kprobe(&execve_kp);
unregister_kprobe(&newfstatat_kp);
unregister_kprobe(&faccessat_kp);
unregister_kprobe(&pts_unix98_lookup_kp);
for (int i = 0; i < ARRAY_SIZE(su_kps); i++) {
destroy_kprobe(&su_kps[i]);
}
#endif
}

3
manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Settings.kt
View File

@ -181,7 +181,6 @@ fun SettingScreen(navigator: DestinationsNavigator) {
title = stringResource(id = R.string.settings_disable_su),
summary = stringResource(id = R.string.settings_disable_su_summary),
checked = isSuDisabled,
enabled = !isSuDisabled // we can't re-enable su if it's disabled.
) { checked ->
val shouldEnable = !checked
if (Natives.setSuEnabled(shouldEnable)) {
@ -502,4 +501,4 @@ private fun TopBar(
@Composable
private fun SettingsPreview() {
SettingScreen(EmptyDestinationsNavigator)
}
}