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