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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 9db87ae630
commit 2dfc802d90
1 changed files with 47 additions and 28 deletions
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75
kernel/core_hook.c
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@@ -24,6 +24,7 @@
#include <linux/uaccess.h>
#include <linux/uidgid.h>
#include <linux/version.h>
#include <linux/workqueue.h>
#include <linux/lsm_hooks.h>
#include <linux/binfmts.h>
#include <linux/tty.h>
@@ -148,6 +149,8 @@ static inline bool is_zygote_normal_app_uid(uid_t uid)
bool ksu_module_mounted = false;
static struct workqueue_struct *ksu_workqueue;
#ifdef CONFIG_COMPAT
bool ksu_is_compat __read_mostly = false;
#endif
@@ -973,6 +976,28 @@ void susfs_try_umount_all(uid_t uid) {
}
#endif
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("/data/adb/kpm", false, MNT_DETACH, uid);
// try umount ksu temp path
try_umount("/debug_ramdisk", false, MNT_DETACH);
try_umount("/sbin", false, MNT_DETACH, uid);
try_umount("/system/etc/hosts", false, MNT_DETACH, uid);
// try umount lsposed dex2oat bins
try_umount("/apex/com.android.art/bin/dex2oat64", false, MNT_DETACH, uid);
try_umount("/apex/com.android.art/bin/dex2oat32", false, MNT_DETACH, uid);
kfree(work);
}
#ifdef CONFIG_KSU_SUSFS
int ksu_handle_setuid(struct cred *new, const struct cred *old)
{
@@ -1053,24 +1078,14 @@ do_umount:
#else
// fixme: use `collect_mounts` and `iterate_mount` to iterate all mountpoint and
// filter the mountpoint whose target is `/data/adb`
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);
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);
try_umount("/sbin", false, MNT_DETACH, uid);
// try umount hosts file
try_umount("/system/etc/hosts", false, MNT_DETACH, uid);
// try umount lsposed dex2oat bins
try_umount("/apex/com.android.art/bin/dex2oat64", false, MNT_DETACH, uid);
try_umount("/apex/com.android.art/bin/dex2oat32", false, MNT_DETACH, uid);
INIT_WORK(work, do_umount_work);
queue_work(ksu_workqueue, work);
#endif // #ifdef CONFIG_KSU_SUSFS_TRY_UMOUNT
@@ -1163,18 +1178,14 @@ 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("/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);
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);
// try umount ksu su path
try_umount("/sbin", false, MNT_DETACH);
INIT_WORK(work, do_umount_work);
queue_work(ksu_workqueue, work);
return 0;
}
@@ -1499,6 +1510,10 @@ __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");
}
ksu_lsm_hook_init();
#ifdef CONFIG_KPROBES
int rc = ksu_kprobe_init();
@@ -1520,4 +1535,8 @@ void ksu_core_exit(void)
pr_info("ksu_core_kprobe_exit\n");
ksu_kprobe_exit();
#endif
if (ksu_workqueue) {
flush_workqueue(ksu_workqueue);
destroy_workqueue(ksu_workqueue);
}
}