1 /* Internal procfs definitions 2 * 3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/proc_fs.h> 13 #include <linux/proc_ns.h> 14 #include <linux/spinlock.h> 15 #include <linux/atomic.h> 16 #include <linux/binfmts.h> 17 #include <linux/sched/coredump.h> 18 #include <linux/sched/task.h> 19 20 struct ctl_table_header; 21 struct mempolicy; 22 23 /* 24 * This is not completely implemented yet. The idea is to 25 * create an in-memory tree (like the actual /proc filesystem 26 * tree) of these proc_dir_entries, so that we can dynamically 27 * add new files to /proc. 28 * 29 * parent/subdir are used for the directory structure (every /proc file has a 30 * parent, but "subdir" is empty for all non-directory entries). 31 * subdir_node is used to build the rb tree "subdir" of the parent. 32 */ 33 struct proc_dir_entry { 34 /* 35 * number of callers into module in progress; 36 * negative -> it's going away RSN 37 */ 38 atomic_t in_use; 39 atomic_t count; /* use count */ 40 struct list_head pde_openers; /* who did ->open, but not ->release */ 41 /* protects ->pde_openers and all struct pde_opener instances */ 42 spinlock_t pde_unload_lock; 43 struct completion *pde_unload_completion; 44 const struct inode_operations *proc_iops; 45 const struct file_operations *proc_fops; 46 void *data; 47 unsigned int low_ino; 48 nlink_t nlink; 49 kuid_t uid; 50 kgid_t gid; 51 loff_t size; 52 struct proc_dir_entry *parent; 53 struct rb_root_cached subdir; 54 struct rb_node subdir_node; 55 umode_t mode; 56 u8 namelen; 57 char name[]; 58 } __randomize_layout; 59 60 union proc_op { 61 int (*proc_get_link)(struct dentry *, struct path *); 62 int (*proc_show)(struct seq_file *m, 63 struct pid_namespace *ns, struct pid *pid, 64 struct task_struct *task); 65 }; 66 67 struct proc_inode { 68 struct pid *pid; 69 unsigned int fd; 70 union proc_op op; 71 struct proc_dir_entry *pde; 72 struct ctl_table_header *sysctl; 73 struct ctl_table *sysctl_entry; 74 struct hlist_node sysctl_inodes; 75 const struct proc_ns_operations *ns_ops; 76 struct inode vfs_inode; 77 } __randomize_layout; 78 79 /* 80 * General functions 81 */ 82 static inline struct proc_inode *PROC_I(const struct inode *inode) 83 { 84 return container_of(inode, struct proc_inode, vfs_inode); 85 } 86 87 static inline struct proc_dir_entry *PDE(const struct inode *inode) 88 { 89 return PROC_I(inode)->pde; 90 } 91 92 static inline void *__PDE_DATA(const struct inode *inode) 93 { 94 return PDE(inode)->data; 95 } 96 97 static inline struct pid *proc_pid(struct inode *inode) 98 { 99 return PROC_I(inode)->pid; 100 } 101 102 static inline struct task_struct *get_proc_task(struct inode *inode) 103 { 104 return get_pid_task(proc_pid(inode), PIDTYPE_PID); 105 } 106 107 void task_dump_owner(struct task_struct *task, umode_t mode, 108 kuid_t *ruid, kgid_t *rgid); 109 110 unsigned name_to_int(const struct qstr *qstr); 111 /* 112 * Offset of the first process in the /proc root directory.. 113 */ 114 #define FIRST_PROCESS_ENTRY 256 115 116 /* Worst case buffer size needed for holding an integer. */ 117 #define PROC_NUMBUF 13 118 119 /* 120 * array.c 121 */ 122 extern const struct file_operations proc_tid_children_operations; 123 124 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *, 125 struct pid *, struct task_struct *); 126 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *, 127 struct pid *, struct task_struct *); 128 extern int proc_pid_status(struct seq_file *, struct pid_namespace *, 129 struct pid *, struct task_struct *); 130 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, 131 struct pid *, struct task_struct *); 132 133 /* 134 * base.c 135 */ 136 extern const struct dentry_operations pid_dentry_operations; 137 extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int); 138 extern int proc_setattr(struct dentry *, struct iattr *); 139 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t); 140 extern int pid_revalidate(struct dentry *, unsigned int); 141 extern int pid_delete_dentry(const struct dentry *); 142 extern int proc_pid_readdir(struct file *, struct dir_context *); 143 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int); 144 extern loff_t mem_lseek(struct file *, loff_t, int); 145 146 /* Lookups */ 147 typedef int instantiate_t(struct inode *, struct dentry *, 148 struct task_struct *, const void *); 149 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int, 150 instantiate_t, struct task_struct *, const void *); 151 152 /* 153 * generic.c 154 */ 155 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); 156 struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *); 157 extern int proc_readdir(struct file *, struct dir_context *); 158 int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *); 159 160 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) 161 { 162 atomic_inc(&pde->count); 163 return pde; 164 } 165 extern void pde_put(struct proc_dir_entry *); 166 167 static inline bool is_empty_pde(const struct proc_dir_entry *pde) 168 { 169 return S_ISDIR(pde->mode) && !pde->proc_iops; 170 } 171 172 /* 173 * inode.c 174 */ 175 struct pde_opener { 176 struct file *file; 177 struct list_head lh; 178 bool closing; 179 struct completion *c; 180 }; 181 extern const struct inode_operations proc_link_inode_operations; 182 183 extern const struct inode_operations proc_pid_link_inode_operations; 184 185 extern void proc_init_inodecache(void); 186 void set_proc_pid_nlink(void); 187 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); 188 extern int proc_fill_super(struct super_block *, void *data, int flags); 189 extern void proc_entry_rundown(struct proc_dir_entry *); 190 191 /* 192 * proc_namespaces.c 193 */ 194 extern const struct inode_operations proc_ns_dir_inode_operations; 195 extern const struct file_operations proc_ns_dir_operations; 196 197 /* 198 * proc_net.c 199 */ 200 extern const struct file_operations proc_net_operations; 201 extern const struct inode_operations proc_net_inode_operations; 202 203 #ifdef CONFIG_NET 204 extern int proc_net_init(void); 205 #else 206 static inline int proc_net_init(void) { return 0; } 207 #endif 208 209 /* 210 * proc_self.c 211 */ 212 extern int proc_setup_self(struct super_block *); 213 214 /* 215 * proc_thread_self.c 216 */ 217 extern int proc_setup_thread_self(struct super_block *); 218 extern void proc_thread_self_init(void); 219 220 /* 221 * proc_sysctl.c 222 */ 223 #ifdef CONFIG_PROC_SYSCTL 224 extern int proc_sys_init(void); 225 extern void proc_sys_evict_inode(struct inode *inode, 226 struct ctl_table_header *head); 227 #else 228 static inline void proc_sys_init(void) { } 229 static inline void proc_sys_evict_inode(struct inode *inode, 230 struct ctl_table_header *head) { } 231 #endif 232 233 /* 234 * proc_tty.c 235 */ 236 #ifdef CONFIG_TTY 237 extern void proc_tty_init(void); 238 #else 239 static inline void proc_tty_init(void) {} 240 #endif 241 242 /* 243 * root.c 244 */ 245 extern struct proc_dir_entry proc_root; 246 extern int proc_parse_options(char *options, struct pid_namespace *pid); 247 248 extern void proc_self_init(void); 249 extern int proc_remount(struct super_block *, int *, char *); 250 251 /* 252 * task_[no]mmu.c 253 */ 254 struct mem_size_stats; 255 struct proc_maps_private { 256 struct inode *inode; 257 struct task_struct *task; 258 struct mm_struct *mm; 259 struct mem_size_stats *rollup; 260 #ifdef CONFIG_MMU 261 struct vm_area_struct *tail_vma; 262 #endif 263 #ifdef CONFIG_NUMA 264 struct mempolicy *task_mempolicy; 265 #endif 266 } __randomize_layout; 267 268 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode); 269 270 extern const struct file_operations proc_pid_maps_operations; 271 extern const struct file_operations proc_tid_maps_operations; 272 extern const struct file_operations proc_pid_numa_maps_operations; 273 extern const struct file_operations proc_tid_numa_maps_operations; 274 extern const struct file_operations proc_pid_smaps_operations; 275 extern const struct file_operations proc_pid_smaps_rollup_operations; 276 extern const struct file_operations proc_tid_smaps_operations; 277 extern const struct file_operations proc_clear_refs_operations; 278 extern const struct file_operations proc_pagemap_operations; 279 280 extern unsigned long task_vsize(struct mm_struct *); 281 extern unsigned long task_statm(struct mm_struct *, 282 unsigned long *, unsigned long *, 283 unsigned long *, unsigned long *); 284 extern void task_mem(struct seq_file *, struct mm_struct *); 285