2 files changed, 46 insertions, 18 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 6af7fba7abb1..7e4877d9dcb5 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -159,6 +159,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
         struct group_info *group_info;
         int g;
         struct fdtable *fdt = NULL;
+        const struct cred *cred;
         pid_t ppid, tpid;
 
         rcu_read_lock();
@@ -170,6 +171,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
                 if (tracer)
                         tpid = task_pid_nr_ns(tracer, ns);
         }
+        cred = get_cred((struct cred *) __task_cred(p));
         seq_printf(m,
                 "State:\t%s\n"
                 "Tgid:\t%d\n"
@@ -182,8 +184,8 @@ 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,
-                p->uid, p->euid, p->suid, p->fsuid,
-                p->gid, p->egid, p->sgid, p->fsgid);
+                cred->uid, cred->euid, cred->suid, cred->fsuid,
+                cred->gid, cred->egid, cred->sgid, cred->fsgid);
 
         task_lock(p);
         if (p->files)
@@ -194,13 +196,12 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
                 fdt ? fdt->max_fds : 0);
         rcu_read_unlock();
 
-        group_info = p->group_info;
-        get_group_info(group_info);
+        group_info = cred->group_info;
         task_unlock(p);
 
         for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
                 seq_printf(m, "%d ", GROUP_AT(group_info, g));
-        put_group_info(group_info);
+        put_cred(cred);
 
         seq_printf(m, "\n");
 }
@@ -262,7 +263,7 @@ static inline void task_sig(struct seq_file *m, struct task_struct *p)
                 blocked = p->blocked;
                 collect_sigign_sigcatch(p, &ignored, &caught);
                 num_threads = atomic_read(&p->signal->count);
-                qsize = atomic_read(&p->user->sigpending);
+                qsize = atomic_read(&__task_cred(p)->user->sigpending);
                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
                 unlock_task_sighand(p, &flags);
         }
@@ -293,10 +294,21 @@ static void render_cap_t(struct seq_file *m, const char *header,
 
 static inline void task_cap(struct seq_file *m, struct task_struct *p)
 {
-        render_cap_t(m, "CapInh:\t", &p->cap_inheritable);
-        render_cap_t(m, "CapPrm:\t", &p->cap_permitted);
-        render_cap_t(m, "CapEff:\t", &p->cap_effective);
-        render_cap_t(m, "CapBnd:\t", &p->cap_bset);
+        const struct cred *cred;
+        kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
+
+        rcu_read_lock();
+        cred = __task_cred(p);
+        cap_inheritable = cred->cap_inheritable;
+        cap_permitted   = cred->cap_permitted;
+        cap_effective   = cred->cap_effective;
+        cap_bset        = cred->cap_bset;
+        rcu_read_unlock();
+
+        render_cap_t(m, "CapInh:\t", &cap_inheritable);
+        render_cap_t(m, "CapPrm:\t", &cap_permitted);
+        render_cap_t(m, "CapEff:\t", &cap_effective);
+        render_cap_t(m, "CapBnd:\t", &cap_bset);
 }
 
 static inline void task_context_switch_counts(struct seq_file *m,
diff --git a/fs/proc/base.c b/fs/proc/base.c
index d4677603c889..0a8a5f880349 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1406,6 +1406,7 @@ static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_st
 {
         struct inode * inode;
         struct proc_inode *ei;
+        const struct cred *cred;
 
         /* We need a new inode */
 
@@ -1428,8 +1429,11 @@ static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_st
         inode->i_uid = 0;
         inode->i_gid = 0;
         if (task_dumpable(task)) {
-                inode->i_uid = task->euid;
-                inode->i_gid = task->egid;
+                rcu_read_lock();
+                cred = __task_cred(task);
+                inode->i_uid = cred->euid;
+                inode->i_gid = cred->egid;
+                rcu_read_unlock();
         }
         security_task_to_inode(task, inode);
 
@@ -1445,6 +1449,8 @@ static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat
 {
         struct inode *inode = dentry->d_inode;
         struct task_struct *task;
+        const struct cred *cred;
+
         generic_fillattr(inode, stat);
 
         rcu_read_lock();
@@ -1454,8 +1460,9 @@ static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat
         if (task) {
                 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
                     task_dumpable(task)) {
-                        stat->uid = task->euid;
-                        stat->gid = task->egid;
+                        cred = __task_cred(task);
+                        stat->uid = cred->euid;
+                        stat->gid = cred->egid;
                 }
         }
         rcu_read_unlock();
@@ -1483,11 +1490,16 @@ static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
         struct inode *inode = dentry->d_inode;
         struct task_struct *task = get_proc_task(inode);
+        const struct cred *cred;
+
         if (task) {
                 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
                     task_dumpable(task)) {
-                        inode->i_uid = task->euid;
-                        inode->i_gid = task->egid;
+                        rcu_read_lock();
+                        cred = __task_cred(task);
+                        inode->i_uid = cred->euid;
+                        inode->i_gid = cred->egid;
+                        rcu_read_unlock();
                 } else {
                         inode->i_uid = 0;
                         inode->i_gid = 0;
@@ -1649,6 +1661,7 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
         struct task_struct *task = get_proc_task(inode);
         int fd = proc_fd(inode);
         struct files_struct *files;
+        const struct cred *cred;
 
         if (task) {
                 files = get_files_struct(task);
@@ -1658,8 +1671,11 @@ static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
                                 rcu_read_unlock();
                                 put_files_struct(files);
                                 if (task_dumpable(task)) {
-                                        inode->i_uid = task->euid;
-                                        inode->i_gid = task->egid;
+                                        rcu_read_lock();
+                                        cred = __task_cred(task);
+                                        inode->i_uid = cred->euid;
+                                        inode->i_gid = cred->egid;
+                                        rcu_read_unlock();
                                 } else {
                                         inode->i_uid = 0;
                                         inode->i_gid = 0;