include/linux/seccomp.h

   1 #ifndef _LINUX_SECCOMP_H
   2 #define _LINUX_SECCOMP_H
   3
   4 #include <uapi/linux/seccomp.h>
   5
   6 #define SECCOMP_FILTER_FLAG_MASK        (SECCOMP_FILTER_FLAG_TSYNC)
   7
   8 #ifdef CONFIG_SECCOMP
   9
  10 #include <linux/thread_info.h>
  11 #include <asm/seccomp.h>
  12
  13 struct seccomp_filter;
  14 /**
  15  * struct seccomp - the state of a seccomp'ed process
  16  *
  17  * @mode:  indicates one of the valid values above for controlled
  18  *         system calls available to a process.
  19  * @filter: must always point to a valid seccomp-filter or NULL as it is
  20  *          accessed without locking during system call entry.
  21  *
  22  *          @filter must only be accessed from the context of current as there
  23  *          is no read locking.
  24  */
  25 struct seccomp {
  26         int mode;
  27         struct seccomp_filter *filter;
  28 };
  29
  30 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
  31 extern int __secure_computing(const struct seccomp_data *sd);
  32 static inline int secure_computing(const struct seccomp_data *sd)
  33 {
  34         if (unlikely(test_thread_flag(TIF_SECCOMP)))
  35                 return  __secure_computing(sd);
  36         return 0;
  37 }
  38 #else
  39 extern void secure_computing_strict(int this_syscall);
  40 #endif
  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 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
  58 static inline int secure_computing(struct seccomp_data *sd) { return 0; }
  59 #else
  60 static inline void secure_computing_strict(int this_syscall) { return; }
  61 #endif
  62
  63 static inline long prctl_get_seccomp(void)
  64 {
  65         return -EINVAL;
  66 }
  67
  68 static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
  69 {
  70         return -EINVAL;
  71 }
  72
  73 static inline int seccomp_mode(struct seccomp *s)
  74 {
  75         return SECCOMP_MODE_DISABLED;
  76 }
  77 #endif /* CONFIG_SECCOMP */
  78
  79 #ifdef CONFIG_SECCOMP_FILTER
  80 extern void put_seccomp_filter(struct task_struct *tsk);
  81 extern void get_seccomp_filter(struct task_struct *tsk);
  82 #else  /* CONFIG_SECCOMP_FILTER */
  83 static inline void put_seccomp_filter(struct task_struct *tsk)
  84 {
  85         return;
  86 }
  87 static inline void get_seccomp_filter(struct task_struct *tsk)
  88 {
  89         return;
  90 }
  91 #endif /* CONFIG_SECCOMP_FILTER */
  92
  93 #if defined(CONFIG_SECCOMP_FILTER) && defined(CONFIG_CHECKPOINT_RESTORE)
  94 extern long seccomp_get_filter(struct task_struct *task,
  95                                unsigned long filter_off, void __user *data);
  96 #else
  97 static inline long seccomp_get_filter(struct task_struct *task,
  98                                       unsigned long n, void __user *data)
  99 {
 100         return -EINVAL;
 101 }
 102 #endif /* CONFIG_SECCOMP_FILTER && CONFIG_CHECKPOINT_RESTORE */
 103 #endif /* _LINUX_SECCOMP_H */