[PATCH] proc: Simplify the ownership rules for /proc

Currently in /proc if the task is dumpable all of files are owned by the tasks
effective users.  Otherwise the files are owned by root.  Unless it is the
/proc/<tgid>/ or /proc/<tgid>/task/<pid> directory in that case we always make
the directory owned by the effective user.

However the special case for directories is pointless except as a way to read
the effective user, because the permissions on both of those directories are
world readable, and executable.

/proc/<tgid>/status provides a much better way to read a processes effecitve
userid, so it is silly to try to provide that on the directory.

So this patch simplifies the code by removing a pointless special case and
gets us one step closer to being able to remove the hard coded /proc inode
numbers.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 0762bc34d98b..fa0e6bee40fa 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1371,7 +1371,7 @@ static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_st
         ei->type = ino;
         inode->i_uid = 0;
         inode->i_gid = 0;
-        if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
+        if (task_dumpable(task)) {
                 inode->i_uid = task->euid;
                 inode->i_gid = task->egid;
         }
@@ -1400,7 +1400,7 @@ static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
         struct inode *inode = dentry->d_inode;
         struct task_struct *task = proc_task(inode);
         if (pid_alive(task)) {
-                if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) {
+                if (task_dumpable(task)) {
                         inode->i_uid = task->euid;
                         inode->i_gid = task->egid;
                 } else {