This is a note to let you know that I've just added the patch titled
proc: Restrict mounting the proc filesystem
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
proc-restrict-mounting-the-proc-filesystem.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From aee1c13dd0f6c2fc56e0e492b349ee8ac655880f Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Date: Mon, 25 Mar 2013 19:57:10 -0700
Subject: proc: Restrict mounting the proc filesystem
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
commit aee1c13dd0f6c2fc56e0e492b349ee8ac655880f upstream.
Don't allow mounting the proc filesystem unless the caller has
CAP_SYS_ADMIN rights over the pid namespace. The principle here is if
you create or have capabilities over it you can mount it, otherwise
you get to live with what other people have mounted.
Andy pointed out that this is needed to prevent users in a user
namespace from remounting proc and specifying different hidepid and gid
options on already existing proc mounts.
Reported-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/proc/root.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -110,7 +110,8 @@ static struct dentry *proc_mount(struct
ns = task_active_pid_ns(current);
options = data;
- if (!current_user_ns()->may_mount_proc)
+ if (!current_user_ns()->may_mount_proc ||
+ !ns_capable(ns->user_ns, CAP_SYS_ADMIN))
return ERR_PTR(-EPERM);
}
Patches currently in stable-queue which might be from ebiederm@xxxxxxxxxxxx are
queue-3.11/pidns-fix-hang-in-zap_pid_ns_processes-by-sending-a-potentially-extra-wakeup.patch
queue-3.11/proc-restrict-mounting-the-proc-filesystem.patch
queue-3.11/pidns-fix-vfork-after-unshare-clone_newpid.patch
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