[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>

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 0762bc3..fa0e6be 100644 (file)
--- 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 {