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Revert "Revert "proc: Convert proc_mount to use mount_ns.""

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This reverts commit f0a310e56f.
This commit is contained in:
Franz-Josef Haider 2022-08-12 11:25:45 +00:00 committed by TheKit
parent 9bd099b9fd
commit c9bb59904d
3 changed files with 12 additions and 51 deletions
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8
fs/proc/inode.c
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@ -491,13 +491,17 @@ struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
return inode;
}
int proc_fill_super(struct super_block *s)
int proc_fill_super(struct super_block *s, void *data, int silent)
{
struct pid_namespace *ns = get_pid_ns(s->s_fs_info);
struct inode *root_inode;
int ret;
if (!proc_parse_options(data, ns))
return -EINVAL;
/* User space would break if executables or devices appear on proc */
s->s_iflags |= SB_I_USERNS_VISIBLE | SB_I_NODEV;
s->s_iflags |= SB_I_USERNS_VISIBLE | SB_I_NOEXEC | SB_I_NODEV;
s->s_flags |= SB_NODIRATIME | SB_NOSUID | SB_NOEXEC;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;

3
fs/proc/internal.h
View file

@ -213,7 +213,7 @@ extern const struct file_operations proc_reclaim_operations;
void proc_init_kmemcache(void);
void set_proc_pid_nlink(void);
extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
extern int proc_fill_super(struct super_block *);
extern int proc_fill_super(struct super_block *, void *data, int flags);
extern void proc_entry_rundown(struct proc_dir_entry *);
/*
@ -280,6 +280,7 @@ static inline void proc_tty_init(void) {}
* root.c
*/
extern struct proc_dir_entry proc_root;
extern int proc_parse_options(char *options, struct pid_namespace *pid);
extern void proc_self_init(void);
extern int proc_remount(struct super_block *, int *, char *);

52
fs/proc/root.c
View file

@ -26,21 +26,6 @@
#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,
};
@ -51,7 +36,7 @@ static const match_table_t tokens = {
{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];
@ -104,45 +89,16 @@ int proc_remount(struct super_block *sb, int *flags, char *data)
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 & SB_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)