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 19 struct ctl_table_header; 20 struct mempolicy; 21 22 /* 23 * This is not completely implemented yet. The idea is to 24 * create an in-memory tree (like the actual /proc filesystem 25 * tree) of these proc_dir_entries, so that we can dynamically 26 * add new files to /proc. 27 * 28 * parent/subdir are used for the directory structure (every /proc file has a 29 * parent, but "subdir" is empty for all non-directory entries). 30 * subdir_node is used to build the rb tree "subdir" of the parent. 31 */ 32 struct proc_dir_entry { 33 unsigned int low_ino; 34 umode_t mode; 35 nlink_t nlink; 36 kuid_t uid; 37 kgid_t gid; 38 loff_t size; 39 const struct inode_operations *proc_iops; 40 const struct file_operations *proc_fops; 41 struct proc_dir_entry *parent; 42 struct rb_root subdir; 43 struct rb_node subdir_node; 44 void *data; 45 atomic_t count; /* use count */ 46 atomic_t in_use; /* number of callers into module in progress; */ 47 /* negative -> it's going away RSN */ 48 struct completion *pde_unload_completion; 49 struct list_head pde_openers; /* who did ->open, but not ->release */ 50 spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */ 51 u8 namelen; 52 char name[]; 53 }; 54 55 union proc_op { 56 int (*proc_get_link)(struct dentry *, struct path *); 57 int (*proc_show)(struct seq_file *m, 58 struct pid_namespace *ns, struct pid *pid, 59 struct task_struct *task); 60 }; 61 62 struct proc_inode { 63 struct pid *pid; 64 unsigned int fd; 65 union proc_op op; 66 struct proc_dir_entry *pde; 67 struct ctl_table_header *sysctl; 68 struct ctl_table *sysctl_entry; 69 struct list_head sysctl_inodes; 70 const struct proc_ns_operations *ns_ops; 71 struct inode vfs_inode; 72 }; 73 74 /* 75 * General functions 76 */ 77 static inline struct proc_inode *PROC_I(const struct inode *inode) 78 { 79 return container_of(inode, struct proc_inode, vfs_inode); 80 } 81 82 static inline struct proc_dir_entry *PDE(const struct inode *inode) 83 { 84 return PROC_I(inode)->pde; 85 } 86 87 static inline void *__PDE_DATA(const struct inode *inode) 88 { 89 return PDE(inode)->data; 90 } 91 92 static inline struct pid *proc_pid(struct inode *inode) 93 { 94 return PROC_I(inode)->pid; 95 } 96 97 static inline struct task_struct *get_proc_task(struct inode *inode) 98 { 99 return get_pid_task(proc_pid(inode), PIDTYPE_PID); 100 } 101 102 void task_dump_owner(struct task_struct *task, mode_t mode, 103 kuid_t *ruid, kgid_t *rgid); 104 105 static inline unsigned name_to_int(const struct qstr *qstr) 106 { 107 const char *name = qstr->name; 108 int len = qstr->len; 109 unsigned n = 0; 110 111 if (len > 1 && *name == '0') 112 goto out; 113 while (len-- > 0) { 114 unsigned c = *name++ - '0'; 115 if (c > 9) 116 goto out; 117 if (n >= (~0U-9)/10) 118 goto out; 119 n *= 10; 120 n += c; 121 } 122 return n; 123 out: 124 return ~0U; 125 } 126 127 /* 128 * Offset of the first process in the /proc root directory.. 129 */ 130 #define FIRST_PROCESS_ENTRY 256 131 132 /* Worst case buffer size needed for holding an integer. */ 133 #define PROC_NUMBUF 13 134 135 /* 136 * array.c 137 */ 138 extern const struct file_operations proc_tid_children_operations; 139 140 extern int proc_tid_stat(struct seq_file *, struct pid_namespace *, 141 struct pid *, struct task_struct *); 142 extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *, 143 struct pid *, struct task_struct *); 144 extern int proc_pid_status(struct seq_file *, struct pid_namespace *, 145 struct pid *, struct task_struct *); 146 extern int proc_pid_statm(struct seq_file *, struct pid_namespace *, 147 struct pid *, struct task_struct *); 148 149 /* 150 * base.c 151 */ 152 extern const struct dentry_operations pid_dentry_operations; 153 extern int pid_getattr(struct vfsmount *, struct dentry *, struct kstat *); 154 extern int proc_setattr(struct dentry *, struct iattr *); 155 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t); 156 extern int pid_revalidate(struct dentry *, unsigned int); 157 extern int pid_delete_dentry(const struct dentry *); 158 extern int proc_pid_readdir(struct file *, struct dir_context *); 159 extern struct dentry *proc_pid_lookup(struct inode *, struct dentry *, unsigned int); 160 extern loff_t mem_lseek(struct file *, loff_t, int); 161 162 /* Lookups */ 163 typedef int instantiate_t(struct inode *, struct dentry *, 164 struct task_struct *, const void *); 165 extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, int, 166 instantiate_t, struct task_struct *, const void *); 167 168 /* 169 * generic.c 170 */ 171 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int); 172 extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *, 173 struct dentry *); 174 extern int proc_readdir(struct file *, struct dir_context *); 175 extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *); 176 177 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde) 178 { 179 atomic_inc(&pde->count); 180 return pde; 181 } 182 extern void pde_put(struct proc_dir_entry *); 183 184 static inline bool is_empty_pde(const struct proc_dir_entry *pde) 185 { 186 return S_ISDIR(pde->mode) && !pde->proc_iops; 187 } 188 189 /* 190 * inode.c 191 */ 192 struct pde_opener { 193 struct file *file; 194 struct list_head lh; 195 bool closing; 196 struct completion *c; 197 }; 198 extern const struct inode_operations proc_link_inode_operations; 199 200 extern const struct inode_operations proc_pid_link_inode_operations; 201 202 extern void proc_init_inodecache(void); 203 void set_proc_pid_nlink(void); 204 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); 205 extern int proc_fill_super(struct super_block *, void *data, int flags); 206 extern void proc_entry_rundown(struct proc_dir_entry *); 207 208 /* 209 * proc_namespaces.c 210 */ 211 extern const struct inode_operations proc_ns_dir_inode_operations; 212 extern const struct file_operations proc_ns_dir_operations; 213 214 /* 215 * proc_net.c 216 */ 217 extern const struct file_operations proc_net_operations; 218 extern const struct inode_operations proc_net_inode_operations; 219 220 #ifdef CONFIG_NET 221 extern int proc_net_init(void); 222 #else 223 static inline int proc_net_init(void) { return 0; } 224 #endif 225 226 /* 227 * proc_self.c 228 */ 229 extern int proc_setup_self(struct super_block *); 230 231 /* 232 * proc_thread_self.c 233 */ 234 extern int proc_setup_thread_self(struct super_block *); 235 extern void proc_thread_self_init(void); 236 237 /* 238 * proc_sysctl.c 239 */ 240 #ifdef CONFIG_PROC_SYSCTL 241 extern int proc_sys_init(void); 242 extern void proc_sys_evict_inode(struct inode *inode, 243 struct ctl_table_header *head); 244 #else 245 static inline void proc_sys_init(void) { } 246 static inline void proc_sys_evict_inode(struct inode *inode, 247 struct ctl_table_header *head) { } 248 #endif 249 250 /* 251 * proc_tty.c 252 */ 253 #ifdef CONFIG_TTY 254 extern void proc_tty_init(void); 255 #else 256 static inline void proc_tty_init(void) {} 257 #endif 258 259 /* 260 * root.c 261 */ 262 extern struct proc_dir_entry proc_root; 263 extern int proc_parse_options(char *options, struct pid_namespace *pid); 264 265 extern void proc_self_init(void); 266 extern int proc_remount(struct super_block *, int *, char *); 267 268 /* 269 * task_[no]mmu.c 270 */ 271 struct proc_maps_private { 272 struct inode *inode; 273 struct task_struct *task; 274 struct mm_struct *mm; 275 #ifdef CONFIG_MMU 276 struct vm_area_struct *tail_vma; 277 #endif 278 #ifdef CONFIG_NUMA 279 struct mempolicy *task_mempolicy; 280 #endif 281 }; 282 283 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode); 284 285 extern const struct file_operations proc_pid_maps_operations; 286 extern const struct file_operations proc_tid_maps_operations; 287 extern const struct file_operations proc_pid_numa_maps_operations; 288 extern const struct file_operations proc_tid_numa_maps_operations; 289 extern const struct file_operations proc_pid_smaps_operations; 290 extern const struct file_operations proc_tid_smaps_operations; 291 extern const struct file_operations proc_clear_refs_operations; 292 extern const struct file_operations proc_pagemap_operations; 293 294 extern unsigned long task_vsize(struct mm_struct *); 295 extern unsigned long task_statm(struct mm_struct *, 296 unsigned long *, unsigned long *, 297 unsigned long *, unsigned long *); 298 extern void task_mem(struct seq_file *, struct mm_struct *); 299