Revert "proc: Point /proc/{mounts,net} at /proc/thread-self/{mounts,net} instead of /proc/self/{mounts,net}"

This reverts commits 344470cac42e and e81324407269.

It turns out that the exact path in the symlink matters, if for somewhat
unfortunate reasons: some apparmor configurations don't allow dhclient
access to the per-thread /proc files.  As reported by Jörg Otte:

  audit: type=1400 audit(1407684227.003:28): apparmor="DENIED"
    operation="open" profile="/sbin/dhclient"
    name="/proc/1540/task/1540/net/dev" pid=1540 comm="dhclient"
    requested_mask="r" denied_mask="r" fsuid=0 ouid=0

so we had better revert this for now.  We might be able to work around
this in practice by only using the per-thread symlinks if the thread
isn't the thread group leader, and if the namespaces differ between
threads (which basically never happens).

We'll see. In the meantime, the revert was made to be intentionally easy.

Reported-by: Jörg Otte <jrg.otte@gmail.com>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/proc/root.c b/fs/proc/root.c
index 6296c7626963..094e44d4a6be 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -173,7 +173,7 @@ void __init proc_root_init(void)
 
 	proc_self_init();
 	proc_thread_self_init();
-	proc_symlink("mounts", NULL, "thread-self/mounts");
+	proc_symlink("mounts", NULL, "self/mounts");
 
 	proc_net_init();