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Implement workqueue for unmounting

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umount schedules, so it cannot be used in kprobe context.
This commit is contained in:
Wang Han
2025-11-01 19:54:52 +08:00
committed by ShirkNeko
parent 7e446efac4
commit 5c96f951b5
1 changed files with 33 additions and 8 deletions
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41
kernel/core_hook.c
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@@ -23,6 +23,7 @@
#include <linux/uaccess.h>
#include <linux/uidgid.h>
#include <linux/version.h>
#include <linux/workqueue.h>
#include <linux/binfmts.h>
#include <linux/tty.h>
@@ -48,6 +49,8 @@
bool ksu_module_mounted = false;
static struct workqueue_struct *ksu_workqueue;
#ifdef CONFIG_COMPAT
bool ksu_is_compat __read_mostly = false;
#endif
@@ -513,6 +516,20 @@ static void try_umount(const char *mnt, bool check_mnt, int flags)
ksu_umount_mnt(&path, flags);
}
static void do_umount_work(struct work_struct *work)
{
try_umount("/odm", true, 0);
try_umount("/system", true, 0);
try_umount("/vendor", true, 0);
try_umount("/product", true, 0);
try_umount("/system_ext", true, 0);
try_umount("/data/adb/modules", false, MNT_DETACH);
// try umount ksu temp path
try_umount("/debug_ramdisk", false, MNT_DETACH);
kfree(work);
}
int ksu_handle_setuid(struct cred *new, const struct cred *old)
{
if (!new || !old) {
@@ -584,14 +601,14 @@ int ksu_handle_setuid(struct cred *new, const struct cred *old)
// fixme: use `collect_mounts` and `iterate_mount` to iterate all mountpoint and
// filter the mountpoint whose target is `/data/adb`
try_umount("/system", true, 0);
try_umount("/vendor", true, 0);
try_umount("/product", true, 0);
try_umount("/system_ext", true, 0);
try_umount("/data/adb/modules", false, MNT_DETACH);
struct work_struct *work = kmalloc(sizeof(struct work_struct), GFP_ATOMIC);
if (!work) {
pr_err("Failed to allocate work\n");
return 0;
}
// try umount ksu temp path
try_umount("/debug_ramdisk", false, MNT_DETACH);
INIT_WORK(work, do_umount_work);
queue_work(ksu_workqueue, work);
get_task_struct(current); // delay fix
ksu_set_current_proc_umounted();
@@ -808,6 +825,10 @@ __maybe_unused int ksu_kprobe_exit(void)
void __init ksu_core_init(void)
{
ksu_workqueue = alloc_workqueue("ksu_umount", WQ_UNBOUND, 0);
if (!ksu_workqueue) {
pr_err("Failed to create ksu workqueue\n");
}
#ifdef CONFIG_KPROBES
int rc = ksu_kprobe_init();
if (rc) {
@@ -827,4 +848,8 @@ void ksu_core_exit(void)
pr_info("ksu_core_exit\n");
ksu_kprobe_exit();
#endif
}
if (ksu_workqueue) {
flush_workqueue(ksu_workqueue);
destroy_workqueue(ksu_workqueue);
}
}