1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SECCOMP_H
3 #define _LINUX_SECCOMP_H
4
5 #include <uapi/linux/seccomp.h>
6
7 #define SECCOMP_FILTER_FLAG_MASK (SECCOMP_FILTER_FLAG_TSYNC | \
8 SECCOMP_FILTER_FLAG_LOG | \
9 SECCOMP_FILTER_FLAG_SPEC_ALLOW | \
10 SECCOMP_FILTER_FLAG_NEW_LISTENER | \
11 SECCOMP_FILTER_FLAG_TSYNC_ESRCH | \
12 SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV)
13
14 /* sizeof() the first published struct seccomp_notif_addfd */
15 #define SECCOMP_NOTIFY_ADDFD_SIZE_VER0 24
16 #define SECCOMP_NOTIFY_ADDFD_SIZE_LATEST SECCOMP_NOTIFY_ADDFD_SIZE_VER0
17
18 #ifdef CONFIG_SECCOMP
19
20 #include <linux/thread_info.h>
21 #include <linux/atomic.h>
22 #include <asm/seccomp.h>
23
24 struct seccomp_filter;
25 /**
26 * struct seccomp - the state of a seccomp'ed process
27 *
28 * @mode: indicates one of the valid values above for controlled
29 * system calls available to a process.
30 * @filter_count: number of seccomp filters
31 * @filter: must always point to a valid seccomp-filter or NULL as it is
32 * accessed without locking during system call entry.
33 *
34 * @filter must only be accessed from the context of current as there
35 * is no read locking.
36 */
37 struct seccomp {
38 int mode;
39 atomic_t filter_count;
40 struct seccomp_filter *filter;
41 };
42
43 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
44 extern int __secure_computing(const struct seccomp_data *sd);
secure_computing(void)45 static inline int secure_computing(void)
46 {
47 if (unlikely(test_syscall_work(SECCOMP)))
48 return __secure_computing(NULL);
49 return 0;
50 }
51 #else
52 extern void secure_computing_strict(int this_syscall);
53 #endif
54
55 extern long prctl_get_seccomp(void);
56 extern long prctl_set_seccomp(unsigned long, void __user *);
57
seccomp_mode(struct seccomp * s)58 static inline int seccomp_mode(struct seccomp *s)
59 {
60 return s->mode;
61 }
62
63 #else /* CONFIG_SECCOMP */
64
65 #include <linux/errno.h>
66
67 struct seccomp { };
68 struct seccomp_filter { };
69 struct seccomp_data;
70
71 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
secure_computing(void)72 static inline int secure_computing(void) { return 0; }
__secure_computing(const struct seccomp_data * sd)73 static inline int __secure_computing(const struct seccomp_data *sd) { return 0; }
74 #else
secure_computing_strict(int this_syscall)75 static inline void secure_computing_strict(int this_syscall) { return; }
76 #endif
77
prctl_get_seccomp(void)78 static inline long prctl_get_seccomp(void)
79 {
80 return -EINVAL;
81 }
82
prctl_set_seccomp(unsigned long arg2,char __user * arg3)83 static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
84 {
85 return -EINVAL;
86 }
87
seccomp_mode(struct seccomp * s)88 static inline int seccomp_mode(struct seccomp *s)
89 {
90 return SECCOMP_MODE_DISABLED;
91 }
92 #endif /* CONFIG_SECCOMP */
93
94 #ifdef CONFIG_SECCOMP_FILTER
95 extern void seccomp_filter_release(struct task_struct *tsk);
96 extern void get_seccomp_filter(struct task_struct *tsk);
97 #else /* CONFIG_SECCOMP_FILTER */
seccomp_filter_release(struct task_struct * tsk)98 static inline void seccomp_filter_release(struct task_struct *tsk)
99 {
100 return;
101 }
get_seccomp_filter(struct task_struct * tsk)102 static inline void get_seccomp_filter(struct task_struct *tsk)
103 {
104 return;
105 }
106 #endif /* CONFIG_SECCOMP_FILTER */
107
108 #if defined(CONFIG_SECCOMP_FILTER) && defined(CONFIG_CHECKPOINT_RESTORE)
109 extern long seccomp_get_filter(struct task_struct *task,
110 unsigned long filter_off, void __user *data);
111 extern long seccomp_get_metadata(struct task_struct *task,
112 unsigned long filter_off, void __user *data);
113 #else
seccomp_get_filter(struct task_struct * task,unsigned long n,void __user * data)114 static inline long seccomp_get_filter(struct task_struct *task,
115 unsigned long n, void __user *data)
116 {
117 return -EINVAL;
118 }
seccomp_get_metadata(struct task_struct * task,unsigned long filter_off,void __user * data)119 static inline long seccomp_get_metadata(struct task_struct *task,
120 unsigned long filter_off,
121 void __user *data)
122 {
123 return -EINVAL;
124 }
125 #endif /* CONFIG_SECCOMP_FILTER && CONFIG_CHECKPOINT_RESTORE */
126
127 #ifdef CONFIG_SECCOMP_CACHE_DEBUG
128 struct seq_file;
129
130 int proc_pid_seccomp_cache(struct seq_file *m, struct pid_namespace *ns,
131 struct pid *pid, struct task_struct *task);
132 #endif
133 #endif /* _LINUX_SECCOMP_H */
134