include/linux/seccomp.h

   1 #ifndef _LINUX_SECCOMP_H
   2 #define _LINUX_SECCOMP_H
   3
   4 #include <uapi/linux/seccomp.h>
   5
   6 #ifdef CONFIG_SECCOMP
   7
   8 #include <linux/thread_info.h>
   9 #include <asm/seccomp.h>
  10
  11 struct seccomp_filter;
  12 /**
  13  * struct seccomp - the state of a seccomp'ed process
  14  *
  15  * @mode:  indicates one of the valid values above for controlled
  16  *         system calls available to a process.
  17  * @filter: The metadata and ruleset for determining what system calls
  18  *          are allowed for a task.
  19  *
  20  *          @filter must only be accessed from the context of current as there
  21  *          is no locking.
  22  */
  23 struct seccomp {
  24         int mode;
  25         struct seccomp_filter *filter;
  26 };
  27
  28 extern int __secure_computing(int);
  29 static inline int secure_computing(int this_syscall)
  30 {
  31         if (unlikely(test_thread_flag(TIF_SECCOMP)))
  32                 return  __secure_computing(this_syscall);
  33         return 0;
  34 }
  35
  36 /* A wrapper for architectures supporting only SECCOMP_MODE_STRICT. */
  37 static inline void secure_computing_strict(int this_syscall)
  38 {
  39         BUG_ON(secure_computing(this_syscall) != 0);
  40 }
  41
  42 extern long prctl_get_seccomp(void);
  43 extern long prctl_set_seccomp(unsigned long, char __user *);
  44
  45 static inline int seccomp_mode(struct seccomp *s)
  46 {
  47         return s->mode;
  48 }
  49
  50 #else /* CONFIG_SECCOMP */
  51
  52 #include <linux/errno.h>
  53
  54 struct seccomp { };
  55 struct seccomp_filter { };
  56
  57 static inline int secure_computing(int this_syscall) { return 0; }
  58 static inline void secure_computing_strict(int this_syscall) { return; }
  59
  60 static inline long prctl_get_seccomp(void)
  61 {
  62         return -EINVAL;
  63 }
  64
  65 static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
  66 {
  67         return -EINVAL;
  68 }
  69
  70 static inline int seccomp_mode(struct seccomp *s)
  71 {
  72         return 0;
  73 }
  74 #endif /* CONFIG_SECCOMP */
  75
  76 #ifdef CONFIG_SECCOMP_FILTER
  77 extern void put_seccomp_filter(struct task_struct *tsk);
  78 extern void get_seccomp_filter(struct task_struct *tsk);
  79 #else  /* CONFIG_SECCOMP_FILTER */
  80 static inline void put_seccomp_filter(struct task_struct *tsk)
  81 {
  82         return;
  83 }
  84 static inline void get_seccomp_filter(struct task_struct *tsk)
  85 {
  86         return;
  87 }
  88 #endif /* CONFIG_SECCOMP_FILTER */
  89 #endif /* _LINUX_SECCOMP_H */