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/refcount.h> 15 #include <linux/spinlock.h> 16 #include <linux/atomic.h> 17 #include <linux/binfmts.h> 18 #include <linux/sched/coredump.h> 19 #include <linux/sched/task.h> 20 21 struct ctl_table_header; 22 struct mempolicy; 23 24 /* 25 * This is not completely implemented yet. The idea is to 26 * create an in-memory tree (like the actual /proc filesystem 27 * tree) of these proc_dir_entries, so that we can dynamically 28 * add new files to /proc. 29 * 30 * parent/subdir are used for the directory structure (every /proc file has a 31 * parent, but "subdir" is empty for all non-directory entries). 32 * subdir_node is used to build the rb tree "subdir" of the parent. 33 */ 34 struct proc_dir_entry { 35 /* 36 * number of callers into module in progress; 37 * negative -> it's going away RSN 38 */ 39 atomic_t in_use; 40 refcount_t refcnt; 41 struct list_head pde_openers; /* who did ->open, but not ->release */ 42 /* protects ->pde_openers and all struct pde_opener instances */ 43 spinlock_t pde_unload_lock; 44 struct completion *pde_unload_completion; 45 const struct inode_operations *proc_iops; 46 const struct file_operations *proc_fops; 47 void *data; 48 unsigned int low_ino; 49 nlink_t nlink; 50 kuid_t uid; 51 kgid_t gid; 52 loff_t size; 53 struct proc_dir_entry *parent; 54 struct rb_root subdir; 55 struct rb_node subdir_node; 56 char *name; 57 umode_t mode; 58 u8 namelen; 59 #ifdef CONFIG_64BIT 60 #define SIZEOF_PDE_INLINE_NAME (192-139) 61 #else 62 #define SIZEOF_PDE_INLINE_NAME (128-87) 63 #endif 64 char inline_name[SIZEOF_PDE_INLINE_NAME]; 65 } __randomize_layout; 66 67 extern struct kmem_cache *proc_dir_entry_cache; 68 void pde_free(struct proc_dir_entry *pde); 69 70 union proc_op { 71 int (*proc_get_link)(struct dentry *, struct path *); 72 int (*proc_show)(struct seq_file *m, 73 struct pid_namespace *ns, struct pid *pid, 74 struct task_struct *task); 75 }; 76 77 struct proc_inode { 78 struct pid *pid; 79 unsigned int fd; 80 union proc_op op; 81 struct proc_dir_entry *pde; 82 struct ctl_table_header *sysctl; 83 struct ctl_table *sysctl_entry; 84 struct hlist_node sysctl_inodes; 85 const struct proc_ns_operations *ns_ops; 86 struct inode vfs_inode; 87 } __randomize_layout; 88 89 /* 90 * General functions 91 */ 92 static inline struct proc_inode *PROC_I(const struct inode *inode) 93 { 94 return container_of(inode, struct proc_inode, vfs_inode); 95 } 96 97 static inline struct proc_dir_entry *PDE(const struct inode *inode) 98 { 99 return PROC_I(inode)->pde; 100 } 101 102 static inline void *__PDE_DATA(const struct inode *inode) 103 { 104 return PDE(inode)->data; 105 } 106 107 static inline struct pid *proc_pid(struct inode *inode) 108 { 109 return PROC_I(inode)->pid; 110 } 111 112 static inline struct task_struct *get_proc_task(struct inode *inode) 113 { 114 return get_pid_task(proc_pid(inode), PIDTYPE_PID); 115 } 116 117 void task_dump_owner(struct task_struct *task, umode_t mode, 118 kuid_t *ruid, kgid_t *rgid); 119 120 unsigned name_to_int(const struct qstr *qstr); 121 /* 122 * Offset of the first process in the /proc root directory.. 123 */ 124 #define FIRST_PROCESS_ENTRY 256 125 126 /* Worst case buffer size needed for holding an integer. */ 127 #define PROC_NUMBUF 13 128 129 /* 130 * array.c 131 */ 132 extern const struct file_operations proc_tid_children_operations; 133 134 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *, 135 struct pid *, struct task_struct *); 136 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *, 137 struct pid *, struct task_struct *); 138 extern int proc_pid_status(struct seq_file *, struct pid_namespace *, 139 struct pid *, struct task_struct *); 140 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, 141 struct pid *, struct task_struct *); 142 143 /* 144 * base.c 145 */ 146 extern const struct dentry_operations pid_dentry_operations; 147 extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int); 148 extern int proc_setattr(struct dentry *, struct iattr *); 149 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t); 150 extern int pid_revalidate(struct dentry *, unsigned int); 151 extern int pid_delete_dentry(const struct dentry *); 152 extern int proc_pid_readdir(struct file *, struct dir_context *); 153 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int); 154 extern loff_t mem_lseek(struct file *, loff_t, int); 155 156 /* Lookups */ 157 typedef int instantiate_t(struct inode *, struct dentry *, 158 struct task_struct *, const void *); 159 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int, 160 instantiate_t, struct task_struct *, const void *); 161 162 /* 163 * generic.c 164 */ 165 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); 166 struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *); 167 extern int proc_readdir(struct file *, struct dir_context *); 168 int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *); 169 170 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) 171 { 172 refcount_inc(&pde->refcnt); 173 return pde; 174 } 175 extern void pde_put(struct proc_dir_entry *); 176 177 static inline bool is_empty_pde(const struct proc_dir_entry *pde) 178 { 179 return S_ISDIR(pde->mode) && !pde->proc_iops; 180 } 181 182 /* 183 * inode.c 184 */ 185 struct pde_opener { 186 struct file *file; 187 struct list_head lh; 188 bool closing; 189 struct completion *c; 190 } __randomize_layout; 191 extern const struct inode_operations proc_link_inode_operations; 192 193 extern const struct inode_operations proc_pid_link_inode_operations; 194 195 void proc_init_kmemcache(void); 196 void set_proc_pid_nlink(void); 197 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); 198 extern int proc_fill_super(struct super_block *, void *data, int flags); 199 extern void proc_entry_rundown(struct proc_dir_entry *); 200 201 /* 202 * proc_namespaces.c 203 */ 204 extern const struct inode_operations proc_ns_dir_inode_operations; 205 extern const struct file_operations proc_ns_dir_operations; 206 207 /* 208 * proc_net.c 209 */ 210 extern const struct file_operations proc_net_operations; 211 extern const struct inode_operations proc_net_inode_operations; 212 213 #ifdef CONFIG_NET 214 extern int proc_net_init(void); 215 #else 216 static inline int proc_net_init(void) { return 0; } 217 #endif 218 219 /* 220 * proc_self.c 221 */ 222 extern int proc_setup_self(struct super_block *); 223 224 /* 225 * proc_thread_self.c 226 */ 227 extern int proc_setup_thread_self(struct super_block *); 228 extern void proc_thread_self_init(void); 229 230 /* 231 * proc_sysctl.c 232 */ 233 #ifdef CONFIG_PROC_SYSCTL 234 extern int proc_sys_init(void); 235 extern void proc_sys_evict_inode(struct inode *inode, 236 struct ctl_table_header *head); 237 #else 238 static inline void proc_sys_init(void) { } 239 static inline void proc_sys_evict_inode(struct inode *inode, 240 struct ctl_table_header *head) { } 241 #endif 242 243 /* 244 * proc_tty.c 245 */ 246 #ifdef CONFIG_TTY 247 extern void proc_tty_init(void); 248 #else 249 static inline void proc_tty_init(void) {} 250 #endif 251 252 /* 253 * root.c 254 */ 255 extern struct proc_dir_entry proc_root; 256 extern int proc_parse_options(char *options, struct pid_namespace *pid); 257 258 extern void proc_self_init(void); 259 extern int proc_remount(struct super_block *, int *, char *); 260 261 /* 262 * task_[no]mmu.c 263 */ 264 struct mem_size_stats; 265 struct proc_maps_private { 266 struct inode *inode; 267 struct task_struct *task; 268 struct mm_struct *mm; 269 struct mem_size_stats *rollup; 270 #ifdef CONFIG_MMU 271 struct vm_area_struct *tail_vma; 272 #endif 273 #ifdef CONFIG_NUMA 274 struct mempolicy *task_mempolicy; 275 #endif 276 } __randomize_layout; 277 278 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode); 279 280 extern const struct file_operations proc_pid_maps_operations; 281 extern const struct file_operations proc_tid_maps_operations; 282 extern const struct file_operations proc_pid_numa_maps_operations; 283 extern const struct file_operations proc_tid_numa_maps_operations; 284 extern const struct file_operations proc_pid_smaps_operations; 285 extern const struct file_operations proc_pid_smaps_rollup_operations; 286 extern const struct file_operations proc_tid_smaps_operations; 287 extern const struct file_operations proc_clear_refs_operations; 288 extern const struct file_operations proc_pagemap_operations; 289 290 extern unsigned long task_vsize(struct mm_struct *); 291 extern unsigned long task_statm(struct mm_struct *, 292 unsigned long *, unsigned long *, 293 unsigned long *, unsigned long *); 294 extern void task_mem(struct seq_file *, struct mm_struct *); 295