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-rw-r--r--fs/proc/namespaces.c153
1 files changed, 14 insertions, 139 deletions
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 8902609..c9eac45 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -1,10 +1,6 @@
#include <linux/proc_fs.h>
#include <linux/nsproxy.h>
-#include <linux/sched.h>
#include <linux/ptrace.h>
-#include <linux/fs_struct.h>
-#include <linux/mount.h>
-#include <linux/path.h>
#include <linux/namei.h>
#include <linux/file.h>
#include <linux/utsname.h>
@@ -34,138 +30,45 @@ static const struct proc_ns_operations *ns_entries[] = {
&mntns_operations,
};
-static const struct file_operations ns_file_operations = {
- .llseek = no_llseek,
-};
-
-static const struct inode_operations ns_inode_operations = {
- .setattr = proc_setattr,
-};
-
-static char *ns_dname(struct dentry *dentry, char *buffer, int buflen)
-{
- struct inode *inode = dentry->d_inode;
- const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns.ns_ops;
-
- return dynamic_dname(dentry, buffer, buflen, "%s:[%lu]",
- ns_ops->name, inode->i_ino);
-}
-
-const struct dentry_operations ns_dentry_operations =
-{
- .d_delete = always_delete_dentry,
- .d_dname = ns_dname,
-};
-
-static struct dentry *proc_ns_get_dentry(struct super_block *sb,
- struct task_struct *task, const struct proc_ns_operations *ns_ops)
-{
- struct dentry *dentry, *result;
- struct inode *inode;
- struct proc_inode *ei;
- struct qstr qname = { .name = "", };
- void *ns;
-
- ns = ns_ops->get(task);
- if (!ns)
- return ERR_PTR(-ENOENT);
-
- dentry = d_alloc_pseudo(sb, &qname);
- if (!dentry) {
- ns_ops->put(ns);
- return ERR_PTR(-ENOMEM);
- }
-
- inode = iget_locked(sb, ns_ops->inum(ns));
- if (!inode) {
- dput(dentry);
- ns_ops->put(ns);
- return ERR_PTR(-ENOMEM);
- }
-
- ei = PROC_I(inode);
- if (inode->i_state & I_NEW) {
- inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
- inode->i_op = &ns_inode_operations;
- inode->i_mode = S_IFREG | S_IRUGO;
- inode->i_fop = &ns_file_operations;
- ei->ns.ns_ops = ns_ops;
- ei->ns.ns = ns;
- unlock_new_inode(inode);
- } else {
- ns_ops->put(ns);
- }
-
- d_set_d_op(dentry, &ns_dentry_operations);
- result = d_instantiate_unique(dentry, inode);
- if (result) {
- dput(dentry);
- dentry = result;
- }
-
- return dentry;
-}
-
static void *proc_ns_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
- struct super_block *sb = inode->i_sb;
- struct proc_inode *ei = PROC_I(inode);
+ const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
struct task_struct *task;
struct path ns_path;
void *error = ERR_PTR(-EACCES);
task = get_proc_task(inode);
if (!task)
- goto out;
+ return error;
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
- goto out_put_task;
-
- ns_path.dentry = proc_ns_get_dentry(sb, task, ei->ns.ns_ops);
- if (IS_ERR(ns_path.dentry)) {
- error = ERR_CAST(ns_path.dentry);
- goto out_put_task;
+ if (ptrace_may_access(task, PTRACE_MODE_READ)) {
+ error = ns_get_path(&ns_path, task, ns_ops);
+ if (!error)
+ nd_jump_link(nd, &ns_path);
}
-
- ns_path.mnt = mntget(nd->path.mnt);
- nd_jump_link(nd, &ns_path);
- error = NULL;
-
-out_put_task:
put_task_struct(task);
-out:
return error;
}
static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
struct inode *inode = dentry->d_inode;
- struct proc_inode *ei = PROC_I(inode);
- const struct proc_ns_operations *ns_ops = ei->ns.ns_ops;
+ const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
struct task_struct *task;
- void *ns;
char name[50];
int res = -EACCES;
task = get_proc_task(inode);
if (!task)
- goto out;
-
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
- goto out_put_task;
+ return res;
- res = -ENOENT;
- ns = ns_ops->get(task);
- if (!ns)
- goto out_put_task;
-
- snprintf(name, sizeof(name), "%s:[%u]", ns_ops->name, ns_ops->inum(ns));
- res = readlink_copy(buffer, buflen, name);
- ns_ops->put(ns);
-out_put_task:
+ if (ptrace_may_access(task, PTRACE_MODE_READ)) {
+ res = ns_get_name(name, sizeof(name), task, ns_ops);
+ if (res >= 0)
+ res = readlink_copy(buffer, buflen, name);
+ }
put_task_struct(task);
-out:
return res;
}
@@ -189,7 +92,7 @@ static int proc_ns_instantiate(struct inode *dir,
ei = PROC_I(inode);
inode->i_mode = S_IFLNK|S_IRWXUGO;
inode->i_op = &proc_ns_link_inode_operations;
- ei->ns.ns_ops = ns_ops;
+ ei->ns_ops = ns_ops;
d_set_d_op(dentry, &pid_dentry_operations);
d_add(dentry, inode);
@@ -267,31 +170,3 @@ const struct inode_operations proc_ns_dir_inode_operations = {
.getattr = pid_getattr,
.setattr = proc_setattr,
};
-
-struct file *proc_ns_fget(int fd)
-{
- struct file *file;
-
- file = fget(fd);
- if (!file)
- return ERR_PTR(-EBADF);
-
- if (file->f_op != &ns_file_operations)
- goto out_invalid;
-
- return file;
-
-out_invalid:
- fput(file);
- return ERR_PTR(-EINVAL);
-}
-
-struct proc_ns *get_proc_ns(struct inode *inode)
-{
- return &PROC_I(inode)->ns;
-}
-
-bool proc_ns_inode(struct inode *inode)
-{
- return inode->i_fop == &ns_file_operations;
-}
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