This is a hack that must not go to any tree, but this
makes patch testing from shell possible.
When creating a new pid namespace one need to mount a new
proc instance in this space context. But the /proc will
contain pids and self symlink only and this breaks some
important tools like ps and sshd.
They expect /proc/stat, /proc/mounts and some other entries
to be present.
Without this patch the only possible way to test the
namespace is to make all the operations performed from
self-made programs. With it one may use general command
line tools.
This patch makes them visible, but this is ugly. Correct
fix must make some kind of proc_entries namespace but this
is another interesting task.
Signed-off-by: Pavel Emelianov <xemul@xxxxxxxxxx>
---
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 9401a6f..eec1eb6 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -393,6 +393,10 @@ struct dentry *proc_lookup(struct inode
spin_lock(&proc_subdir_lock);
de = PDE(dir);
if (de) {
+#ifdef CONFIG_PID_NS
+ if (de->parent == de)
+ de = &proc_root;
+#endif
for (de = de->subdir; de ; de = de->next) {
if (de->namelen != dentry->d_name.len)
continue;
@@ -446,6 +450,10 @@ int proc_readdir(struct file * filp,
ret = -EINVAL;
goto out;
}
+#ifdef CONFIG_PID_NS
+ if (de->parent == de)
+ de = &proc_root;
+#endif
i = filp->f_pos;
switch (i) {
case 0:
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