linux/include/linux/seccomp.h
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   1#ifndef _LINUX_SECCOMP_H
   2#define _LINUX_SECCOMP_H
   3
   4#include <linux/compiler.h>
   5#include <linux/types.h>
   6
   7
   8/* Valid values for seccomp.mode and prctl(PR_SET_SECCOMP, <mode>) */
   9#define SECCOMP_MODE_DISABLED   0 /* seccomp is not in use. */
  10#define SECCOMP_MODE_STRICT     1 /* uses hard-coded filter. */
  11#define SECCOMP_MODE_FILTER     2 /* uses user-supplied filter. */
  12
  13/*
  14 * All BPF programs must return a 32-bit value.
  15 * The bottom 16-bits are for optional return data.
  16 * The upper 16-bits are ordered from least permissive values to most.
  17 *
  18 * The ordering ensures that a min_t() over composed return values always
  19 * selects the least permissive choice.
  20 */
  21#define SECCOMP_RET_KILL        0x00000000U /* kill the task immediately */
  22#define SECCOMP_RET_TRAP        0x00030000U /* disallow and force a SIGSYS */
  23#define SECCOMP_RET_ERRNO       0x00050000U /* returns an errno */
  24#define SECCOMP_RET_TRACE       0x7ff00000U /* pass to a tracer or disallow */
  25#define SECCOMP_RET_ALLOW       0x7fff0000U /* allow */
  26
  27/* Masks for the return value sections. */
  28#define SECCOMP_RET_ACTION      0x7fff0000U
  29#define SECCOMP_RET_DATA        0x0000ffffU
  30
  31/**
  32 * struct seccomp_data - the format the BPF program executes over.
  33 * @nr: the system call number
  34 * @arch: indicates system call convention as an AUDIT_ARCH_* value
  35 *        as defined in <linux/audit.h>.
  36 * @instruction_pointer: at the time of the system call.
  37 * @args: up to 6 system call arguments always stored as 64-bit values
  38 *        regardless of the architecture.
  39 */
  40struct seccomp_data {
  41        int nr;
  42        __u32 arch;
  43        __u64 instruction_pointer;
  44        __u64 args[6];
  45};
  46
  47#ifdef __KERNEL__
  48#ifdef CONFIG_SECCOMP
  49
  50#include <linux/thread_info.h>
  51#include <asm/seccomp.h>
  52
  53struct seccomp_filter;
  54/**
  55 * struct seccomp - the state of a seccomp'ed process
  56 *
  57 * @mode:  indicates one of the valid values above for controlled
  58 *         system calls available to a process.
  59 * @filter: The metadata and ruleset for determining what system calls
  60 *          are allowed for a task.
  61 *
  62 *          @filter must only be accessed from the context of current as there
  63 *          is no locking.
  64 */
  65struct seccomp {
  66        int mode;
  67        struct seccomp_filter *filter;
  68};
  69
  70extern int __secure_computing(int);
  71static inline int secure_computing(int this_syscall)
  72{
  73        if (unlikely(test_thread_flag(TIF_SECCOMP)))
  74                return  __secure_computing(this_syscall);
  75        return 0;
  76}
  77
  78/* A wrapper for architectures supporting only SECCOMP_MODE_STRICT. */
  79static inline void secure_computing_strict(int this_syscall)
  80{
  81        BUG_ON(secure_computing(this_syscall) != 0);
  82}
  83
  84extern long prctl_get_seccomp(void);
  85extern long prctl_set_seccomp(unsigned long, char __user *);
  86
  87static inline int seccomp_mode(struct seccomp *s)
  88{
  89        return s->mode;
  90}
  91
  92#else /* CONFIG_SECCOMP */
  93
  94#include <linux/errno.h>
  95
  96struct seccomp { };
  97struct seccomp_filter { };
  98
  99static inline int secure_computing(int this_syscall) { return 0; }
 100static inline void secure_computing_strict(int this_syscall) { return; }
 101
 102static inline long prctl_get_seccomp(void)
 103{
 104        return -EINVAL;
 105}
 106
 107static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
 108{
 109        return -EINVAL;
 110}
 111
 112static inline int seccomp_mode(struct seccomp *s)
 113{
 114        return 0;
 115}
 116#endif /* CONFIG_SECCOMP */
 117
 118#ifdef CONFIG_SECCOMP_FILTER
 119extern void put_seccomp_filter(struct task_struct *tsk);
 120extern void get_seccomp_filter(struct task_struct *tsk);
 121extern u32 seccomp_bpf_load(int off);
 122#else  /* CONFIG_SECCOMP_FILTER */
 123static inline void put_seccomp_filter(struct task_struct *tsk)
 124{
 125        return;
 126}
 127static inline void get_seccomp_filter(struct task_struct *tsk)
 128{
 129        return;
 130}
 131#endif /* CONFIG_SECCOMP_FILTER */
 132#endif /* __KERNEL__ */
 133#endif /* _LINUX_SECCOMP_H */
 134
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