userns: Convert proc to use kuid/kgid where appropriate

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

4 files changed, 19 insertions, 13 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 36a0a9192ece..dc4c5a7b9ece 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -191,8 +191,14 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
                 task_tgid_nr_ns(p, ns),
                 pid_nr_ns(pid, ns),
                 ppid, tpid,
-                cred->uid, cred->euid, cred->suid, cred->fsuid,
-                cred->gid, cred->egid, cred->sgid, cred->fsgid);
+                from_kuid_munged(user_ns, cred->uid),
+                from_kuid_munged(user_ns, cred->euid),
+                from_kuid_munged(user_ns, cred->suid),
+                from_kuid_munged(user_ns, cred->fsuid),
+                from_kgid_munged(user_ns, cred->gid),
+                from_kgid_munged(user_ns, cred->egid),
+                from_kgid_munged(user_ns, cred->sgid),
+                from_kgid_munged(user_ns, cred->fsgid));
 
         task_lock(p);
         if (p->files)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 2ee514c7e64a..c47904994b78 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1562,8 +1562,8 @@ int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
         generic_fillattr(inode, stat);
 
         rcu_read_lock();
-        stat->uid = 0;
-        stat->gid = 0;
+        stat->uid = GLOBAL_ROOT_UID;
+        stat->gid = GLOBAL_ROOT_GID;
         task = pid_task(proc_pid(inode), PIDTYPE_PID);
         if (task) {
                 if (!has_pid_permissions(pid, task, 2)) {
@@ -1623,8 +1623,8 @@ int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
                         inode->i_gid = cred->egid;
                         rcu_read_unlock();
                 } else {
-                        inode->i_uid = 0;
-                        inode->i_gid = 0;
+                        inode->i_uid = GLOBAL_ROOT_UID;
+                        inode->i_gid = GLOBAL_ROOT_GID;
                 }
                 inode->i_mode &= ~(S_ISUID | S_ISGID);
                 security_task_to_inode(task, inode);
@@ -1811,8 +1811,8 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
                                         inode->i_gid = cred->egid;
                                         rcu_read_unlock();
                                 } else {
-                                        inode->i_uid = 0;
-                                        inode->i_gid = 0;
+                                        inode->i_uid = GLOBAL_ROOT_UID;
+                                        inode->i_gid = GLOBAL_ROOT_GID;
                                 }
                                 inode->i_mode &= ~(S_ISUID | S_ISGID);
                                 security_task_to_inode(task, inode);
@@ -2061,8 +2061,8 @@ static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
                         inode->i_gid = cred->egid;
                         rcu_read_unlock();
                 } else {
-                        inode->i_uid = 0;
-                        inode->i_gid = 0;
+                        inode->i_uid = GLOBAL_ROOT_UID;
+                        inode->i_gid = GLOBAL_ROOT_GID;
                 }
                 security_task_to_inode(task, inode);
                 status = 1;
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 205c92280838..554ecc54799f 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -108,8 +108,8 @@ static int proc_show_options(struct seq_file *seq, struct dentry *root)
         struct super_block *sb = root->d_sb;
         struct pid_namespace *pid = sb->s_fs_info;
 
-        if (pid->pid_gid)
-                seq_printf(seq, ",gid=%lu", (unsigned long)pid->pid_gid);
+        if (!gid_eq(pid->pid_gid, GLOBAL_ROOT_GID))
+                seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, pid->pid_gid));
         if (pid->hide_pid != 0)
                 seq_printf(seq, ",hidepid=%u", pid->hide_pid);
 
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 46a15d8a29ca..df4e4561dbbf 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -67,7 +67,7 @@ static int proc_parse_options(char *options, struct pid_namespace *pid)
                 case Opt_gid:
                         if (match_int(&args[0], &option))
                                 return 0;
-                        pid->pid_gid = option;
+                        pid->pid_gid = make_kgid(current_user_ns(), option);
                         break;
                 case Opt_hidepid:
                         if (match_int(&args[0], &option))