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(void);
  32 static inline int secure_computing(void)
  33 {
  34         if (unlikely(test_thread_flag(TIF_SECCOMP)))
  35                 return  __secure_computing();
  36         return 0;
  37 }
  38
  39 #define SECCOMP_PHASE1_OK       0
  40 #define SECCOMP_PHASE1_SKIP     1
  41
  42 extern u32 seccomp_phase1(struct seccomp_data *sd);
  43 int seccomp_phase2(u32 phase1_result);
  44 #else
  45 extern void secure_computing_strict(int this_syscall);
  46 #endif
  47
  48 extern long prctl_get_seccomp(void);
  49 extern long prctl_set_seccomp(unsigned long, char __user *);
  50
  51 static inline int seccomp_mode(struct seccomp *s)
  52 {
  53         return s->mode;
  54 }
  55
  56 #else /* CONFIG_SECCOMP */
  57
  58 #include <linux/errno.h>
  59
  60 struct seccomp { };
  61 struct seccomp_filter { };
  62
  63 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
  64 static inline int secure_computing(void) { return 0; }
  65 #else
  66 static inline void secure_computing_strict(int this_syscall) { return; }
  67 #endif
  68
  69 static inline long prctl_get_seccomp(void)
  70 {
  71         return -EINVAL;
  72 }
  73
  74 static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
  75 {
  76         return -EINVAL;
  77 }
  78
  79 static inline int seccomp_mode(struct seccomp *s)
  80 {
  81         return 0;
  82 }
  83 #endif /* CONFIG_SECCOMP */
  84
  85 #ifdef CONFIG_SECCOMP_FILTER
  86 extern void put_seccomp_filter(struct task_struct *tsk);
  87 extern void get_seccomp_filter(struct task_struct *tsk);
  88 #else  /* CONFIG_SECCOMP_FILTER */
  89 static inline void put_seccomp_filter(struct task_struct *tsk)
  90 {
  91         return;
  92 }
  93 static inline void get_seccomp_filter(struct task_struct *tsk)
  94 {
  95         return;
  96 }
  97 #endif /* CONFIG_SECCOMP_FILTER */
  98 #endif /* _LINUX_SECCOMP_H */