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Date: Tue, 31 Mar 2015 11:15:35 +0800
From: Ian Kent <raven@...maw.net>
To: Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: David Howells <dhowells@...hat.com>,
Oleg Nesterov <onestero@...hat.com>,
Trond Myklebust <trond.myklebust@...marydata.com>,
"J. Bruce Fields" <bfields@...ldses.org>,
Benjamin Coddington <bcodding@...hat.com>,
Al Viro <viro@...IV.linux.org.uk>,
Jeff Layton <jeff.layton@...marydata.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [RFC PATCH 5 7/7] KEYS: exec request key within service thread of
key creator
From: Ian Kent <ikent@...hat.com>
Containerized request key helper callbacks need the ability to execute
a binary in a container's context. To do that get a token to a service
thread created within the container environment for usermode helper calls.
Signed-off-by: Ian Kent <ikent@...hat.com>
Cc: Benjamin Coddington <bcodding@...hat.com>
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: J. Bruce Fields <bfields@...ldses.org>
Cc: David Howells <dhowells@...hat.com>
Cc: Trond Myklebust <trond.myklebust@...marydata.com>
Cc: Oleg Nesterov <onestero@...hat.com>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Jeff Layton <jeff.layton@...marydata.com>
---
include/linux/key.h | 3 +++
security/keys/gc.c | 2 ++
security/keys/key.c | 5 +++++
security/keys/request_key.c | 34 +++++++++++++++++++++++++++-------
4 files changed, 37 insertions(+), 7 deletions(-)
diff --git a/include/linux/key.h b/include/linux/key.h
index e1d4715..144727d 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -209,6 +209,9 @@ struct key {
} payload;
struct assoc_array keys;
};
+
+ /* Namespace token */
+ int umh_token;
};
extern struct key *key_alloc(struct key_type *type,
diff --git a/security/keys/gc.c b/security/keys/gc.c
index c795237..c689ffd 100644
--- a/security/keys/gc.c
+++ b/security/keys/gc.c
@@ -156,6 +156,8 @@ static noinline void key_gc_unused_keys(struct list_head *keys)
kfree(key->description);
+ umh_wq_put_token(key->umh_token);
+
#ifdef KEY_DEBUGGING
key->magic = KEY_DEBUG_MAGIC_X;
#endif
diff --git a/security/keys/key.c b/security/keys/key.c
index aee2ec5..3ca0825 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -18,6 +18,8 @@
#include <linux/workqueue.h>
#include <linux/random.h>
#include <linux/err.h>
+#include <net/net_namespace.h>
+#include <linux/nsproxy.h>
#include "internal.h"
struct kmem_cache *key_jar;
@@ -309,6 +311,9 @@ struct key *key_alloc(struct key_type *type, const char *desc,
/* publish the key by giving it a serial number */
atomic_inc(&user->nkeys);
key_alloc_serial(key);
+ /* If running within a container use the container namespace */
+ if (current->nsproxy->net_ns != &init_net)
+ key->umh_token = umh_wq_get_token(0, "keys");
error:
return key;
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index e865f9f..233e837 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -70,26 +70,40 @@ static void umh_keys_cleanup(struct subprocess_info *info)
}
/*
- * Call a usermode helper with a specific session keyring.
+ * Call a usermode helper with a specific session keyring and execute
+ * within a namespace.
*/
-static int call_usermodehelper_keys(char *path, char **argv, char **envp,
- struct key *session_keyring, int wait)
+static int call_usermodehelper_keys_service(char *path,
+ char **argv, char **envp,
+ struct key *session_keyring,
+ int token, unsigned int wait)
{
struct subprocess_info *info;
unsigned int gfp_mask = (wait & UMH_NO_WAIT) ?
GFP_ATOMIC : GFP_KERNEL;
info = call_usermodehelper_setup(path, argv, envp, gfp_mask,
- umh_keys_init, umh_keys_cleanup,
- session_keyring);
+ umh_keys_init, umh_keys_cleanup,
+ session_keyring);
if (!info)
return -ENOMEM;
+ info->wq_token = token;
key_get(session_keyring);
return call_usermodehelper_exec(info, wait);
}
/*
+ * Call a usermode helper with a specific session keyring.
+ */
+static int call_usermodehelper_keys(char *path, char **argv, char **envp,
+ struct key *session_keyring, int wait)
+{
+ return call_usermodehelper_keys_service(path, argv, envp,
+ session_keyring, 0, wait);
+}
+
+/*
* Request userspace finish the construction of a key
* - execute "/sbin/request-key <op> <key> <uid> <gid> <keyring> <keyring> <keyring>"
*/
@@ -174,8 +188,14 @@ static int call_sbin_request_key(struct key_construction *cons,
argv[i] = NULL;
/* do it */
- ret = call_usermodehelper_keys(argv[0], argv, envp, keyring,
- UMH_WAIT_PROC);
+ /* If running within a container use the container namespace */
+ if (key->umh_token)
+ ret = call_usermodehelper_keys_service(argv[0], argv, envp,
+ keyring, key->umh_token,
+ UMH_WAIT_PROC);
+ else
+ ret = call_usermodehelper_keys(argv[0], argv, envp,
+ keyring, UMH_WAIT_PROC);
kdebug("usermode -> 0x%x", ret);
if (ret >= 0) {
/* ret is the exit/wait code */
--
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