1 #ifndef __LINUX_UMH_H__
2 #define __LINUX_UMH_H__
3 
4 #include <linux/gfp.h>
5 #include <linux/stddef.h>
6 #include <linux/errno.h>
7 #include <linux/compiler.h>
8 #include <linux/workqueue.h>
9 #include <linux/sysctl.h>
10 
11 struct cred;
12 struct file;
13 
14 #define UMH_NO_WAIT	0	/* don't wait at all */
15 #define UMH_WAIT_EXEC	1	/* wait for the exec, but not the process */
16 #define UMH_WAIT_PROC	2	/* wait for the process to complete */
17 #define UMH_KILLABLE	4	/* wait for EXEC/PROC killable */
18 
19 struct subprocess_info {
20 	struct work_struct work;
21 	struct completion *complete;
22 	const char *path;
23 	char **argv;
24 	char **envp;
25 	struct file *file;
26 	int wait;
27 	int retval;
28 	pid_t pid;
29 	int (*init)(struct subprocess_info *info, struct cred *new);
30 	void (*cleanup)(struct subprocess_info *info);
31 	void *data;
32 } __randomize_layout;
33 
34 extern int
35 call_usermodehelper(const char *path, char **argv, char **envp, int wait);
36 
37 extern struct subprocess_info *
38 call_usermodehelper_setup(const char *path, char **argv, char **envp,
39 			  gfp_t gfp_mask,
40 			  int (*init)(struct subprocess_info *info, struct cred *new),
41 			  void (*cleanup)(struct subprocess_info *), void *data);
42 
43 struct subprocess_info *call_usermodehelper_setup_file(struct file *file,
44 			  int (*init)(struct subprocess_info *info, struct cred *new),
45 			  void (*cleanup)(struct subprocess_info *), void *data);
46 struct umh_info {
47 	struct file *pipe_to_umh;
48 	struct file *pipe_from_umh;
49 	pid_t pid;
50 };
51 int fork_usermode_blob(void *data, size_t len, struct umh_info *info);
52 
53 extern int
54 call_usermodehelper_exec(struct subprocess_info *info, int wait);
55 
56 extern struct ctl_table usermodehelper_table[];
57 
58 enum umh_disable_depth {
59 	UMH_ENABLED = 0,
60 	UMH_FREEZING,
61 	UMH_DISABLED,
62 };
63 
64 extern int __usermodehelper_disable(enum umh_disable_depth depth);
65 extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
66 
usermodehelper_disable(void)67 static inline int usermodehelper_disable(void)
68 {
69 	return __usermodehelper_disable(UMH_DISABLED);
70 }
71 
usermodehelper_enable(void)72 static inline void usermodehelper_enable(void)
73 {
74 	__usermodehelper_set_disable_depth(UMH_ENABLED);
75 }
76 
77 extern int usermodehelper_read_trylock(void);
78 extern long usermodehelper_read_lock_wait(long timeout);
79 extern void usermodehelper_read_unlock(void);
80 
81 #endif /* __LINUX_UMH_H__ */
82