mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-15 08:44:14 +08:00
2cb33cac62
A malicious monitor can craft an auth reply message that could cause a NULL function pointer dereference in the client's kernel. To prevent this, the auth_none protocol handler needs an empty ceph_auth_client_ops->build_request() function. CVE-2013-1059 Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Reported-by: Chanam Park <chanam.park@hkpco.kr> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Sage Weil <sage@inktank.com> Cc: stable@vger.kernel.org
138 lines
3.0 KiB
C
138 lines
3.0 KiB
C
|
|
#include <linux/ceph/ceph_debug.h>
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/random.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/ceph/decode.h>
|
|
#include <linux/ceph/auth.h>
|
|
|
|
#include "auth_none.h"
|
|
|
|
static void reset(struct ceph_auth_client *ac)
|
|
{
|
|
struct ceph_auth_none_info *xi = ac->private;
|
|
|
|
xi->starting = true;
|
|
xi->built_authorizer = false;
|
|
}
|
|
|
|
static void destroy(struct ceph_auth_client *ac)
|
|
{
|
|
kfree(ac->private);
|
|
ac->private = NULL;
|
|
}
|
|
|
|
static int is_authenticated(struct ceph_auth_client *ac)
|
|
{
|
|
struct ceph_auth_none_info *xi = ac->private;
|
|
|
|
return !xi->starting;
|
|
}
|
|
|
|
static int should_authenticate(struct ceph_auth_client *ac)
|
|
{
|
|
struct ceph_auth_none_info *xi = ac->private;
|
|
|
|
return xi->starting;
|
|
}
|
|
|
|
static int build_request(struct ceph_auth_client *ac, void *buf, void *end)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* the generic auth code decode the global_id, and we carry no actual
|
|
* authenticate state, so nothing happens here.
|
|
*/
|
|
static int handle_reply(struct ceph_auth_client *ac, int result,
|
|
void *buf, void *end)
|
|
{
|
|
struct ceph_auth_none_info *xi = ac->private;
|
|
|
|
xi->starting = false;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* build an 'authorizer' with our entity_name and global_id. we can
|
|
* reuse a single static copy since it is identical for all services
|
|
* we connect to.
|
|
*/
|
|
static int ceph_auth_none_create_authorizer(
|
|
struct ceph_auth_client *ac, int peer_type,
|
|
struct ceph_auth_handshake *auth)
|
|
{
|
|
struct ceph_auth_none_info *ai = ac->private;
|
|
struct ceph_none_authorizer *au = &ai->au;
|
|
void *p, *end;
|
|
int ret;
|
|
|
|
if (!ai->built_authorizer) {
|
|
p = au->buf;
|
|
end = p + sizeof(au->buf);
|
|
ceph_encode_8(&p, 1);
|
|
ret = ceph_entity_name_encode(ac->name, &p, end - 8);
|
|
if (ret < 0)
|
|
goto bad;
|
|
ceph_decode_need(&p, end, sizeof(u64), bad2);
|
|
ceph_encode_64(&p, ac->global_id);
|
|
au->buf_len = p - (void *)au->buf;
|
|
ai->built_authorizer = true;
|
|
dout("built authorizer len %d\n", au->buf_len);
|
|
}
|
|
|
|
auth->authorizer = (struct ceph_authorizer *) au;
|
|
auth->authorizer_buf = au->buf;
|
|
auth->authorizer_buf_len = au->buf_len;
|
|
auth->authorizer_reply_buf = au->reply_buf;
|
|
auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
|
|
|
|
return 0;
|
|
|
|
bad2:
|
|
ret = -ERANGE;
|
|
bad:
|
|
return ret;
|
|
}
|
|
|
|
static void ceph_auth_none_destroy_authorizer(struct ceph_auth_client *ac,
|
|
struct ceph_authorizer *a)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
static const struct ceph_auth_client_ops ceph_auth_none_ops = {
|
|
.name = "none",
|
|
.reset = reset,
|
|
.destroy = destroy,
|
|
.is_authenticated = is_authenticated,
|
|
.should_authenticate = should_authenticate,
|
|
.build_request = build_request,
|
|
.handle_reply = handle_reply,
|
|
.create_authorizer = ceph_auth_none_create_authorizer,
|
|
.destroy_authorizer = ceph_auth_none_destroy_authorizer,
|
|
};
|
|
|
|
int ceph_auth_none_init(struct ceph_auth_client *ac)
|
|
{
|
|
struct ceph_auth_none_info *xi;
|
|
|
|
dout("ceph_auth_none_init %p\n", ac);
|
|
xi = kzalloc(sizeof(*xi), GFP_NOFS);
|
|
if (!xi)
|
|
return -ENOMEM;
|
|
|
|
xi->starting = true;
|
|
xi->built_authorizer = false;
|
|
|
|
ac->protocol = CEPH_AUTH_NONE;
|
|
ac->private = xi;
|
|
ac->ops = &ceph_auth_none_ops;
|
|
return 0;
|
|
}
|
|
|