CRED: Separate task security context from task_struct

Separate the task security context from task_struct.  At this point, the
security data is temporarily embedded in the task_struct with two pointers
pointing to it.

Note that the Alpha arch is altered as it refers to (E)UID and (E)GID in
entry.S via asm-offsets.

With comment fixes Signed-off-by: Marc Dionne <marc.c.dionne@gmail.com>

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

2 files changed, 18 insertions, 16 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 6af7fba..62fe9b2 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -182,8 +182,8 @@ 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);
+		p->cred->uid, p->cred->euid, p->cred->suid, p->cred->fsuid,
+		p->cred->gid, p->cred->egid, p->cred->sgid, p->cred->fsgid);
 
 	task_lock(p);
 	if (p->files)
@@ -194,7 +194,7 @@ 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;
+	group_info = p->cred->group_info;
 	get_group_info(group_info);
 	task_unlock(p);
 
@@ -262,7 +262,7 @@ 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(&p->cred->user->sigpending);
 		qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
 		unlock_task_sighand(p, &flags);
 	}
@@ -293,10 +293,12 @@ 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);
+	struct cred *cred = p->cred;
+
+	render_cap_t(m, "CapInh:\t", &cred->cap_inheritable);
+	render_cap_t(m, "CapPrm:\t", &cred->cap_permitted);
+	render_cap_t(m, "CapEff:\t", &cred->cap_effective);
+	render_cap_t(m, "CapBnd:\t", &cred->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 486cf3f..6862b36 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1428,8 +1428,8 @@ 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;
+		inode->i_uid = task->cred->euid;
+		inode->i_gid = task->cred->egid;
 	}
 	security_task_to_inode(task, inode);
 
@@ -1454,8 +1454,8 @@ 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;
+			stat->uid = task->cred->euid;
+			stat->gid = task->cred->egid;
 		}
 	}
 	rcu_read_unlock();
@@ -1486,8 +1486,8 @@ static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
 	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;
+			inode->i_uid = task->cred->euid;
+			inode->i_gid = task->cred->egid;
 		} else {
 			inode->i_uid = 0;
 			inode->i_gid = 0;
@@ -1658,8 +1658,8 @@ 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;
+					inode->i_uid = task->cred->euid;
+					inode->i_gid = task->cred->egid;
 				} else {
 					inode->i_uid = 0;
 					inode->i_gid = 0;