diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2013-03-25 19:57:10 -0700 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2013-08-26 11:36:58 -0700 |
| commit | aee1c13dd0f6c2fc56e0e492b349ee8ac655880f (patch) | |
| tree | 29d0afcbf37968e8fccd1dfff76deadf86c7a338 | |
| parent | 5ff9d8a65ce80efb509ce4e8051394e9ed2cd942 (diff) | |
proc: Restrict mounting the proc filesystem
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.
Cc: stable@vger.kernel.org
Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
| -rw-r--r-- | fs/proc/root.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c index 229e366598d..38bd5d423fc 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -110,7 +110,8 @@ static struct dentry *proc_mount(struct file_system_type *fs_type, 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); } |