docs: Add devpts description for non gki

Author: tiann

kernel/sucompat.c

@@ -168,6 +168,37 @@ int ksu_handle_execve_sucompat(int *fd, const char __user **filename_user,
 	return 0;
 }
 
+int ksu_handle_devpts(struct inode *inode)
+{
+	if (!current->mm) {
+		return 0;
+	}
+
+	uid_t uid = current_uid().val;
+	if (uid % 100000 < 10000) {
+		// not untrusted_app, ignore it
+		return 0;
+	}
+
+	if (!ksu_is_allow_uid(uid))
+		return 0;
+
+	if (ksu_devpts_sid) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0)
+		struct inode_security_struct *sec = selinux_inode(inode);
+#else
+		struct inode_security_struct *sec = (struct inode_security_struct *) inode->i_security;
+#endif
+		if (sec) {
+			sec->sid = ksu_devpts_sid;
+			inode->i_uid.val = 0;
+			inode->i_gid.val = 0;
+		}
+	}
+
+	return 0;
+}
+
 #ifdef CONFIG_KPROBES
 
 __maybe_unused static int faccessat_handler_pre(struct kprobe *p,
@@ -292,19 +323,6 @@ static struct kprobe execve_kp = {
 
 static int devpts_get_priv_pre(struct kprobe *p, struct pt_regs *regs)
 {
-	if (!current->mm) {
-		return 0;
-	}
-
-	uid_t uid = current_uid().val;
-	if (uid % 100000 < 10000) {
-		// not untrusted_app, ignore it
-		return 0;
-	}
-
-	if (!ksu_is_allow_uid(uid))
-		return 0;
-
 	struct inode *inode;
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0)
 	struct dentry *dentry = (struct dentry *)PT_REGS_PARM1(regs);
@@ -313,16 +331,7 @@ static int devpts_get_priv_pre(struct kprobe *p, struct pt_regs *regs)
 	inode = (struct inode *)PT_REGS_PARM1(real_regs);
 #endif
 
-	if (ksu_devpts_sid) {
-		struct inode_security_struct *sec = selinux_inode(inode);
-		if (sec) {
-			sec->sid = ksu_devpts_sid;
-			inode->i_uid.val = 0;
-			inode->i_gid.val = 0;
-		}
-	}
-
-	return 0;
+	return ksu_handle_devpts(inode);
 }
 
 static struct kprobe devpts_get_priv_kp = { .symbol_name = "devpts_get_priv",

website/docs/guide/how-to-integrate-for-non-gki.md

@@ -264,6 +264,8 @@ index 2ff887661237..e758d7db7663 100644
  		return -EINVAL;
 ```
 
+### Safe Mode
+
 To enable KernelSU's builtin SafeMode, You should also modify `input_handle_event` in `drivers/input/input.c`:
 
 :::tip
@@ -297,6 +299,38 @@ index 45306f9ef247..815091ebfca4 100755
  		add_input_randomness(type, code, value);
 ```
 
+:::info Entering safe mode accidiently?
+If you use manual integration and do not disable `CONFIG_KPROBES`, then the user may trigger safe mode by pressing the volume down button after booting! Therefore if using manual integration you need to disable `CONFIG_KPROBES`!
+:::
+
+### Failed to execute `pm` in terminal?
+
+You should modify `fs/devpts/inode.c`, reference:
+
+```diff
+diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
+index 32f6f1c68..d69d8eca2 100644
+--- a/fs/devpts/inode.c
++++ b/fs/devpts/inode.c
+@@ -602,6 +602,8 @@ struct dentry *devpts_pty_new(struct pts_fs_info *fsi, int index, void *priv)
+        return dentry;
+ }
+
++extern int ksu_handle_devpts(struct inode*);
++
+ /**
+  * devpts_get_priv -- get private data for a slave
+  * @pts_inode: inode of the slave
+@@ -610,6 +612,7 @@ struct dentry *devpts_pty_new(struct pts_fs_info *fsi, int index, void *priv)
+  */
+ void *devpts_get_priv(struct dentry *dentry)
+ {
++       ksu_handle_devpts(dentry->d_inode);
+        if (dentry->d_sb->s_magic != DEVPTS_SUPER_MAGIC)
+                return NULL;
+        return dentry->d_fsdata;
+```
+
 ### How to backport path_umount
 
 You can get module umount feature working on pre-GKI kernels by manually backporting `path_umount` from 5.9. You can use this patch as reference:
@@ -347,7 +381,3 @@ You can get module umount feature working on pre-GKI kernels by manually backpor
 ```
 
 Finally, build your kernel again, KernelSU should work well.
-
-:::info Entering safe mode accidiently?
-If you use manual integration and do not disable `CONFIG_KPROBES`, then the user may trigger safe mode by pressing the volume down button after booting! Therefore if using manual integration you need to disable `CONFIG_KPROBES`!
-:::

website/docs/zh_CN/guide/how-to-integrate-for-non-gki.md

@@ -258,12 +258,18 @@ index 2ff887661237..e758d7db7663 100644
  		return -EINVAL;
 ```
 
+### 安全模式 
+
 要使用 KernelSU 内置的安全模式，你还需要修改 `drivers/input/input.c` 中的 `input_handle_event` 方法：
 
 :::tip
 强烈建议开启此功能，对用户救砖会非常有帮助！
 :::
 
+:::info 莫名其妙进入安全模式？
+如果你采用手动集成的方式，并且没有禁用`CONFIG_KPROBES`，那么用户在开机之后按音量下，也可能触发安全模式！因此如果使用手动集成，你需要关闭 `CONFIG_KPROBES`！
+:::
+
 ```diff
 diff --git a/drivers/input/input.c b/drivers/input/input.c
 index 45306f9ef247..815091ebfca4 100755
@@ -291,7 +297,35 @@ index 45306f9ef247..815091ebfca4 100755
  		add_input_randomness(type, code, value);
 ```
 
-### 如何backport(向旧版本移植) path_umount {#how-to-backport-path-umount}
+### pm 命令执行失败？
+
+你需要同时修改 `fs/devpts/inode.c`，补丁如下：
+
+```diff
+diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
+index 32f6f1c68..d69d8eca2 100644
+--- a/fs/devpts/inode.c
++++ b/fs/devpts/inode.c
+@@ -602,6 +602,8 @@ struct dentry *devpts_pty_new(struct pts_fs_info *fsi, int index, void *priv)
+        return dentry;
+ }
+
++extern int ksu_handle_devpts(struct inode*);
++
+ /**
+  * devpts_get_priv -- get private data for a slave
+  * @pts_inode: inode of the slave
+@@ -610,6 +612,7 @@ struct dentry *devpts_pty_new(struct pts_fs_info *fsi, int index, void *priv)
+  */
+ void *devpts_get_priv(struct dentry *dentry)
+ {
++       ksu_handle_devpts(dentry->d_inode);
+        if (dentry->d_sb->s_magic != DEVPTS_SUPER_MAGIC)
+                return NULL;
+        return dentry->d_fsdata;
+```
+
+### path_umount {#how-to-backport-path-umount}
 
 你可以通过从K5.9向旧版本移植`path_umount`，在GKI之前的内核上获得卸载模块的功能。你可以通过以下补丁作为参考:
 
@@ -341,7 +375,3 @@ index 45306f9ef247..815091ebfca4 100755
 ```
 
 改完之后重新编译内核即可。
-
-:::info 莫名其妙进入安全模式？
-如果你采用手动集成的方式，并且没有禁用`CONFIG_KPROBES`，那么用户在开机之后按音量下，也可能触发安全模式！因此如果使用手动集成，你需要关闭 `CONFIG_KPROBES`！
-:::