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kernel: 1. use prctl lsm hook; 2. refine sucompat hook

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weishu
2023-01-19 13:31:55 +07:00
parent 448fcc07e7
commit deac6163d6
7 changed files with 224 additions and 82 deletions
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38
kernel/ksu.c
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@@ -37,8 +37,9 @@ static struct workqueue_struct *ksu_workqueue;
uid_t ksu_manager_uid = INVALID_UID;
void ksu_queue_work(struct work_struct *work) {
queue_work(ksu_workqueue, work);
void ksu_queue_work(struct work_struct *work)
{
queue_work(ksu_workqueue, work);
}
void escape_to_root()
@@ -179,19 +180,9 @@ static bool is_allow_su()
extern void enable_sucompat();
static int handler_pre(struct kprobe *p, struct pt_regs *regs)
int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
struct pt_regs *real_regs = (struct pt_regs *)PT_REGS_PARM1(regs);
#else
struct pt_regs *real_regs = regs;
#endif
int option = (int)PT_REGS_PARM1(real_regs);
unsigned long arg2 = (unsigned long)PT_REGS_PARM2(real_regs);
unsigned long arg3 = (unsigned long)PT_REGS_PARM3(real_regs);
unsigned long arg4 = (unsigned long)PT_REGS_PARM4(real_regs);
unsigned long arg5 = (unsigned long)PT_REGS_PARM5(real_regs);
// if success, we modify the arg5 as result!
u32 *result = (u32 *)arg5;
u32 reply_ok = KERNEL_SU_OPTION;
@@ -309,11 +300,6 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs)
return 0;
}
static struct kprobe kp = {
.symbol_name = PRCTL_SYMBOL,
.pre_handler = handler_pre,
};
int kernelsu_init(void)
{
int rc = 0;
@@ -322,17 +308,12 @@ int kernelsu_init(void)
pr_alert("You are running DEBUG version of KernelSU");
#endif
ksu_lsm_hook_init(); // use ksu_kprobe_init if compiled as module
ksu_workqueue = alloc_workqueue("kernelsu_work_queue", 0, 0);
ksu_allowlist_init();
rc = register_kprobe(&kp);
if (rc) {
pr_info("prctl kprobe failed: %d, please check your kernel config.\n",
rc);
return rc;
}
ksu_uid_observer_init();
enable_sucompat();
@@ -342,12 +323,9 @@ int kernelsu_init(void)
void kernelsu_exit(void)
{
// should never happen...
unregister_kprobe(&kp);
ksu_allowlist_exit();
destroy_workqueue(ksu_workqueue);
destroy_workqueue(ksu_workqueue);
}
module_init(kernelsu_init);