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: must always point to a valid seccomp-filter or NULL as it is 31 * accessed without locking during system call entry. 32 * 33 * @filter must only be accessed from the context of current as there 34 * is no read locking. 35 */ 36 struct seccomp { 37 int mode; 38 atomic_t filter_count; 39 struct seccomp_filter *filter; 40 }; 41 42 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER 43 extern int __secure_computing(const struct seccomp_data *sd); 44 static inline int secure_computing(void) 45 { 46 if (unlikely(test_syscall_work(SECCOMP))) 47 return __secure_computing(NULL); 48 return 0; 49 } 50 #else 51 extern void secure_computing_strict(int this_syscall); 52 #endif 53 54 extern long prctl_get_seccomp(void); 55 extern long prctl_set_seccomp(unsigned long, void __user *); 56 57 static inline int seccomp_mode(struct seccomp *s) 58 { 59 return s->mode; 60 } 61 62 #else /* CONFIG_SECCOMP */ 63 64 #include <linux/errno.h> 65 66 struct seccomp { }; 67 struct seccomp_filter { }; 68 struct seccomp_data; 69 70 #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER 71 static inline int secure_computing(void) { return 0; } 72 static inline int __secure_computing(const struct seccomp_data *sd) { return 0; } 73 #else 74 static inline void secure_computing_strict(int this_syscall) { return; } 75 #endif 76 77 static inline long prctl_get_seccomp(void) 78 { 79 return -EINVAL; 80 } 81 82 static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3) 83 { 84 return -EINVAL; 85 } 86 87 static inline int seccomp_mode(struct seccomp *s) 88 { 89 return SECCOMP_MODE_DISABLED; 90 } 91 #endif /* CONFIG_SECCOMP */ 92 93 #ifdef CONFIG_SECCOMP_FILTER 94 extern void seccomp_filter_release(struct task_struct *tsk); 95 extern void get_seccomp_filter(struct task_struct *tsk); 96 #else /* CONFIG_SECCOMP_FILTER */ 97 static inline void seccomp_filter_release(struct task_struct *tsk) 98 { 99 return; 100 } 101 static inline void get_seccomp_filter(struct task_struct *tsk) 102 { 103 return; 104 } 105 #endif /* CONFIG_SECCOMP_FILTER */ 106 107 #if defined(CONFIG_SECCOMP_FILTER) && defined(CONFIG_CHECKPOINT_RESTORE) 108 extern long seccomp_get_filter(struct task_struct *task, 109 unsigned long filter_off, void __user *data); 110 extern long seccomp_get_metadata(struct task_struct *task, 111 unsigned long filter_off, void __user *data); 112 #else 113 static inline long seccomp_get_filter(struct task_struct *task, 114 unsigned long n, void __user *data) 115 { 116 return -EINVAL; 117 } 118 static inline long seccomp_get_metadata(struct task_struct *task, 119 unsigned long filter_off, 120 void __user *data) 121 { 122 return -EINVAL; 123 } 124 #endif /* CONFIG_SECCOMP_FILTER && CONFIG_CHECKPOINT_RESTORE */ 125 126 #ifdef CONFIG_SECCOMP_CACHE_DEBUG 127 struct seq_file; 128 129 int proc_pid_seccomp_cache(struct seq_file *m, struct pid_namespace *ns, 130 struct pid *pid, struct task_struct *task); 131 #endif 132 #endif /* _LINUX_SECCOMP_H */ 133