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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>
15#include "internal.h"
16
17
18static const struct proc_ns_operations *ns_entries[] = {
19#ifdef CONFIG_NET_NS
20 &netns_operations,
21#endif
22#ifdef CONFIG_UTS_NS
23 &utsns_operations,
24#endif
25#ifdef CONFIG_IPC_NS
26 &ipcns_operations,
27#endif
28};
29
30static const struct file_operations ns_file_operations = {
31 .llseek = no_llseek,
32};
33
34static struct dentry *proc_ns_instantiate(struct inode *dir,
35 struct dentry *dentry, struct task_struct *task, const void *ptr)
36{
37 const struct proc_ns_operations *ns_ops = ptr;
38 struct inode *inode;
39 struct proc_inode *ei;
40 struct dentry *error = ERR_PTR(-ENOENT);
41 void *ns;
42
43 inode = proc_pid_make_inode(dir->i_sb, task);
44 if (!inode)
45 goto out;
46
47 ns = ns_ops->get(task);
48 if (!ns)
49 goto out_iput;
50
51 ei = PROC_I(inode);
52 inode->i_mode = S_IFREG|S_IRUSR;
53 inode->i_fop = &ns_file_operations;
54 ei->ns_ops = ns_ops;
55 ei->ns = ns;
56
57 dentry->d_op = &pid_dentry_operations;
58 d_add(dentry, inode);
59 /* Close the race of the process dying before we return the dentry */
60 if (pid_revalidate(dentry, NULL))
61 error = NULL;
62out:
63 return error;
64out_iput:
65 iput(inode);
66 goto out;
67}
68
69static int proc_ns_fill_cache(struct file *filp, void *dirent,
70 filldir_t filldir, struct task_struct *task,
71 const struct proc_ns_operations *ops)
72{
73 return proc_fill_cache(filp, dirent, filldir,
74 ops->name, strlen(ops->name),
75 proc_ns_instantiate, task, ops);
76}
77
78static int proc_ns_dir_readdir(struct file *filp, void *dirent,
79 filldir_t filldir)
80{
81 int i;
82 struct dentry *dentry = filp->f_path.dentry;
83 struct inode *inode = dentry->d_inode;
84 struct task_struct *task = get_proc_task(inode);
85 const struct proc_ns_operations **entry, **last;
86 ino_t ino;
87 int ret;
88
89 ret = -ENOENT;
90 if (!task)
91 goto out_no_task;
92
93 ret = -EPERM;
94 if (!ptrace_may_access(task, PTRACE_MODE_READ))
95 goto out;
96
97 ret = 0;
98 i = filp->f_pos;
99 switch (i) {
100 case 0:
101 ino = inode->i_ino;
102 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
103 goto out;
104 i++;
105 filp->f_pos++;
106 /* fall through */
107 case 1:
108 ino = parent_ino(dentry);
109 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
110 goto out;
111 i++;
112 filp->f_pos++;
113 /* fall through */
114 default:
115 i -= 2;
116 if (i >= ARRAY_SIZE(ns_entries)) {
117 ret = 1;
118 goto out;
119 }
120 entry = ns_entries + i;
121 last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
122 while (entry <= last) {
123 if (proc_ns_fill_cache(filp, dirent, filldir,
124 task, *entry) < 0)
125 goto out;
126 filp->f_pos++;
127 entry++;
128 }
129 }
130
131 ret = 1;
132out:
133 put_task_struct(task);
134out_no_task:
135 return ret;
136}
137
138const struct file_operations proc_ns_dir_operations = {
139 .read = generic_read_dir,
140 .readdir = proc_ns_dir_readdir,
141};
142
143static struct dentry *proc_ns_dir_lookup(struct inode *dir,
144 struct dentry *dentry, struct nameidata *nd)
145{
146 struct dentry *error;
147 struct task_struct *task = get_proc_task(dir);
148 const struct proc_ns_operations **entry, **last;
149 unsigned int len = dentry->d_name.len;
150
151 error = ERR_PTR(-ENOENT);
152
153 if (!task)
154 goto out_no_task;
155
156 error = ERR_PTR(-EPERM);
157 if (!ptrace_may_access(task, PTRACE_MODE_READ))
158 goto out;
159
160 last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
161 for (entry = ns_entries; entry <= last; entry++) {
162 if (strlen((*entry)->name) != len)
163 continue;
164 if (!memcmp(dentry->d_name.name, (*entry)->name, len))
165 break;
166 }
167 error = ERR_PTR(-ENOENT);
168 if (entry > last)
169 goto out;
170
171 error = proc_ns_instantiate(dir, dentry, task, *entry);
172out:
173 put_task_struct(task);
174out_no_task:
175 return error;
176}
177
178const struct inode_operations proc_ns_dir_inode_operations = {
179 .lookup = proc_ns_dir_lookup,
180 .getattr = pid_getattr,
181 .setattr = proc_setattr,
182};
183
184struct file *proc_ns_fget(int fd)
185{
186 struct file *file;
187
188 file = fget(fd);
189 if (!file)
190 return ERR_PTR(-EBADF);
191
192 if (file->f_op != &ns_file_operations)
193 goto out_invalid;
194
195 return file;
196
197out_invalid:
198 fput(file);
199 return ERR_PTR(-EINVAL);
200}
201
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/ipc_namespace.h>
13#include <linux/pid_namespace.h>
14#include "internal.h"
15
16
17static const struct proc_ns_operations *ns_entries[] = {
18#ifdef CONFIG_NET_NS
19 &netns_operations,
20#endif
21#ifdef CONFIG_UTS_NS
22 &utsns_operations,
23#endif
24#ifdef CONFIG_IPC_NS
25 &ipcns_operations,
26#endif
27};
28
29static const struct file_operations ns_file_operations = {
30 .llseek = no_llseek,
31};
32
33static struct dentry *proc_ns_instantiate(struct inode *dir,
34 struct dentry *dentry, struct task_struct *task, const void *ptr)
35{
36 const struct proc_ns_operations *ns_ops = ptr;
37 struct inode *inode;
38 struct proc_inode *ei;
39 struct dentry *error = ERR_PTR(-ENOENT);
40 void *ns;
41
42 inode = proc_pid_make_inode(dir->i_sb, task);
43 if (!inode)
44 goto out;
45
46 ns = ns_ops->get(task);
47 if (!ns)
48 goto out_iput;
49
50 ei = PROC_I(inode);
51 inode->i_mode = S_IFREG|S_IRUSR;
52 inode->i_fop = &ns_file_operations;
53 ei->ns_ops = ns_ops;
54 ei->ns = ns;
55
56 d_set_d_op(dentry, &pid_dentry_operations);
57 d_add(dentry, inode);
58 /* Close the race of the process dying before we return the dentry */
59 if (pid_revalidate(dentry, NULL))
60 error = NULL;
61out:
62 return error;
63out_iput:
64 iput(inode);
65 goto out;
66}
67
68static int proc_ns_fill_cache(struct file *filp, void *dirent,
69 filldir_t filldir, struct task_struct *task,
70 const struct proc_ns_operations *ops)
71{
72 return proc_fill_cache(filp, dirent, filldir,
73 ops->name, strlen(ops->name),
74 proc_ns_instantiate, task, ops);
75}
76
77static int proc_ns_dir_readdir(struct file *filp, void *dirent,
78 filldir_t filldir)
79{
80 int i;
81 struct dentry *dentry = filp->f_path.dentry;
82 struct inode *inode = dentry->d_inode;
83 struct task_struct *task = get_proc_task(inode);
84 const struct proc_ns_operations **entry, **last;
85 ino_t ino;
86 int ret;
87
88 ret = -ENOENT;
89 if (!task)
90 goto out_no_task;
91
92 ret = -EPERM;
93 if (!ptrace_may_access(task, PTRACE_MODE_READ))
94 goto out;
95
96 ret = 0;
97 i = filp->f_pos;
98 switch (i) {
99 case 0:
100 ino = inode->i_ino;
101 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
102 goto out;
103 i++;
104 filp->f_pos++;
105 /* fall through */
106 case 1:
107 ino = parent_ino(dentry);
108 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
109 goto out;
110 i++;
111 filp->f_pos++;
112 /* fall through */
113 default:
114 i -= 2;
115 if (i >= ARRAY_SIZE(ns_entries)) {
116 ret = 1;
117 goto out;
118 }
119 entry = ns_entries + i;
120 last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
121 while (entry <= last) {
122 if (proc_ns_fill_cache(filp, dirent, filldir,
123 task, *entry) < 0)
124 goto out;
125 filp->f_pos++;
126 entry++;
127 }
128 }
129
130 ret = 1;
131out:
132 put_task_struct(task);
133out_no_task:
134 return ret;
135}
136
137const struct file_operations proc_ns_dir_operations = {
138 .read = generic_read_dir,
139 .readdir = proc_ns_dir_readdir,
140};
141
142static struct dentry *proc_ns_dir_lookup(struct inode *dir,
143 struct dentry *dentry, struct nameidata *nd)
144{
145 struct dentry *error;
146 struct task_struct *task = get_proc_task(dir);
147 const struct proc_ns_operations **entry, **last;
148 unsigned int len = dentry->d_name.len;
149
150 error = ERR_PTR(-ENOENT);
151
152 if (!task)
153 goto out_no_task;
154
155 error = ERR_PTR(-EPERM);
156 if (!ptrace_may_access(task, PTRACE_MODE_READ))
157 goto out;
158
159 last = &ns_entries[ARRAY_SIZE(ns_entries)];
160 for (entry = ns_entries; entry < last; entry++) {
161 if (strlen((*entry)->name) != len)
162 continue;
163 if (!memcmp(dentry->d_name.name, (*entry)->name, len))
164 break;
165 }
166 error = ERR_PTR(-ENOENT);
167 if (entry == last)
168 goto out;
169
170 error = proc_ns_instantiate(dir, dentry, task, *entry);
171out:
172 put_task_struct(task);
173out_no_task:
174 return error;
175}
176
177const struct inode_operations proc_ns_dir_inode_operations = {
178 .lookup = proc_ns_dir_lookup,
179 .getattr = pid_getattr,
180 .setattr = proc_setattr,
181};
182
183struct file *proc_ns_fget(int fd)
184{
185 struct file *file;
186
187 file = fget(fd);
188 if (!file)
189 return ERR_PTR(-EBADF);
190
191 if (file->f_op != &ns_file_operations)
192 goto out_invalid;
193
194 return file;
195
196out_invalid:
197 fput(file);
198 return ERR_PTR(-EINVAL);
199}
200