proc: Convert proc_mount to use mount_ns.
Move the call of get_pid_ns, the call of proc_parse_options, and
the setting of s_iflags into proc_fill_super so that mount_ns
can be used.
Convert proc_mount to call mount_ns and remove the now unnecessary
code.
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: Djalal Harouni <tixxdz@gmail.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/fs/proc/root.c b/fs/proc/root.c
index a1b2860..8d3e484 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -23,21 +23,6 @@
#include "internal.h"
-static int proc_test_super(struct super_block *sb, void *data)
-{
- return sb->s_fs_info == data;
-}
-
-static int proc_set_super(struct super_block *sb, void *data)
-{
- int err = set_anon_super(sb, NULL);
- if (!err) {
- struct pid_namespace *ns = (struct pid_namespace *)data;
- sb->s_fs_info = get_pid_ns(ns);
- }
- return err;
-}
-
enum {
Opt_gid, Opt_hidepid, Opt_err,
};
@@ -48,7 +33,7 @@
{Opt_err, NULL},
};
-static int proc_parse_options(char *options, struct pid_namespace *pid)
+int proc_parse_options(char *options, struct pid_namespace *pid)
{
char *p;
substring_t args[MAX_OPT_ARGS];
@@ -100,45 +85,16 @@
static struct dentry *proc_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
- int err;
- struct super_block *sb;
struct pid_namespace *ns;
- char *options;
if (flags & MS_KERNMOUNT) {
- ns = (struct pid_namespace *)data;
- options = NULL;
+ ns = data;
+ data = NULL;
} else {
ns = task_active_pid_ns(current);
- options = data;
-
- /* Does the mounter have privilege over the pid namespace? */
- if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN))
- return ERR_PTR(-EPERM);
}
- sb = sget(fs_type, proc_test_super, proc_set_super, flags, ns);
- if (IS_ERR(sb))
- return ERR_CAST(sb);
-
- if (!proc_parse_options(options, ns)) {
- deactivate_locked_super(sb);
- return ERR_PTR(-EINVAL);
- }
-
- if (!sb->s_root) {
- err = proc_fill_super(sb);
- if (err) {
- deactivate_locked_super(sb);
- return ERR_PTR(err);
- }
-
- sb->s_flags |= MS_ACTIVE;
- /* User space would break if executables appear on proc */
- sb->s_iflags |= SB_I_NOEXEC;
- }
-
- return dget(sb->s_root);
+ return mount_ns(fs_type, flags, data, ns, ns->user_ns, proc_fill_super);
}
static void proc_kill_sb(struct super_block *sb)
