1 #include <linux/proc_fs.h>
2 #include <linux/nsproxy.h>
3 #include <linux/sched.h>
4 #include <linux/ptrace.h>
5 #include <linux/fs_struct.h>
6 #include <linux/mount.h>
7 #include <linux/path.h>
8 #include <linux/namei.h>
9 #include <linux/file.h>
10 #include <linux/utsname.h>
11 #include <net/net_namespace.h>
12 #include <linux/mnt_namespace.h>
13 #include <linux/ipc_namespace.h>
14 #include <linux/pid_namespace.h>
18 static const struct proc_ns_operations *ns_entries[] = {
30 static const struct file_operations ns_file_operations = {
34 static struct dentry *proc_ns_instantiate(struct inode *dir,
35 struct dentry *dentry, struct task_struct *task, const void *ptr)
37 const struct proc_ns_operations *ns_ops = ptr;
39 struct proc_inode *ei;
40 struct dentry *error = ERR_PTR(-ENOENT);
42 inode = proc_pid_make_inode(dir->i_sb, task);
47 inode->i_mode = S_IFREG|S_IRUSR;
48 inode->i_fop = &ns_file_operations;
50 ei->ns = ns_ops->get(task);
54 dentry->d_op = &pid_dentry_operations;
56 /* Close the race of the process dying before we return the dentry */
57 if (pid_revalidate(dentry, NULL))
66 static int proc_ns_fill_cache(struct file *filp, void *dirent,
67 filldir_t filldir, struct task_struct *task,
68 const struct proc_ns_operations *ops)
70 return proc_fill_cache(filp, dirent, filldir,
71 ops->name, strlen(ops->name),
72 proc_ns_instantiate, task, ops);
75 static int proc_ns_dir_readdir(struct file *filp, void *dirent,
79 struct dentry *dentry = filp->f_path.dentry;
80 struct inode *inode = dentry->d_inode;
81 struct task_struct *task = get_proc_task(inode);
82 const struct proc_ns_operations **entry, **last;
91 if (!ptrace_may_access(task, PTRACE_MODE_READ))
99 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
105 ino = parent_ino(dentry);
106 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
113 if (i >= ARRAY_SIZE(ns_entries)) {
117 entry = ns_entries + i;
118 last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
119 while (entry <= last) {
120 if (proc_ns_fill_cache(filp, dirent, filldir,
130 put_task_struct(task);
135 const struct file_operations proc_ns_dir_operations = {
136 .read = generic_read_dir,
137 .readdir = proc_ns_dir_readdir,
140 static struct dentry *proc_ns_dir_lookup(struct inode *dir,
141 struct dentry *dentry, struct nameidata *nd)
143 struct dentry *error;
144 struct task_struct *task = get_proc_task(dir);
145 const struct proc_ns_operations **entry, **last;
146 unsigned int len = dentry->d_name.len;
148 error = ERR_PTR(-ENOENT);
153 error = ERR_PTR(-EPERM);
154 if (!ptrace_may_access(task, PTRACE_MODE_READ))
157 last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
158 for (entry = ns_entries; entry <= last; entry++) {
159 if (strlen((*entry)->name) != len)
161 if (!memcmp(dentry->d_name.name, (*entry)->name, len))
164 error = ERR_PTR(-ENOENT);
168 error = proc_ns_instantiate(dir, dentry, task, *entry);
170 put_task_struct(task);
175 const struct inode_operations proc_ns_dir_inode_operations = {
176 .lookup = proc_ns_dir_lookup,
177 .getattr = pid_getattr,
178 .setattr = proc_setattr,
181 struct file *proc_ns_fget(int fd)
187 return ERR_PTR(-EBADF);
189 if (file->f_op != &ns_file_operations)
196 return ERR_PTR(-EINVAL);