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drbd: Fix five use after free bugs in get_initial_state

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[ Upstream commit aadb22ba2f656581b2f733deb3a467c48cc618f6 ]

In get_initial_state, it calls notify_initial_state_done(skb,..) if
cb->args[5]==1. If genlmsg_put() failed in notify_initial_state_done(),
the skb will be freed by nlmsg_free(skb).
Then get_initial_state will goto out and the freed skb will be used by
return value skb->len, which is a uaf bug.

What's worse, the same problem goes even further: skb can also be
freed in the notify_*_state_change -> notify_*_state calls below.
Thus 4 additional uaf bugs happened.

My patch lets the problem callee functions: notify_initial_state_done
and notify_*_state_change return an error code if errors happen.
So that the error codes could be propagated and the uaf bugs can be avoid.

v2 reports a compilation warning. This v3 fixed this warning and built
successfully in my local environment with no additional warnings.
v2: https://lore.kernel.org/patchwork/patch/1435218/

Fixes: a29728463b254 ("drbd: Backport the "events2" command")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lv Yunlong 2022-04-06 21:04:43 +02:00 committed by Greg Kroah-Hartman
parent d2c2758cfb
commit 0489700bfe
4 changed files with 42 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/block/drbd/drbd_int.h
View File

@ -1696,22 +1696,22 @@ struct sib_info {
};
void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib);
extern void notify_resource_state(struct sk_buff *,
extern int notify_resource_state(struct sk_buff *,
unsigned int,
struct drbd_resource *,
struct resource_info *,
enum drbd_notification_type);
extern void notify_device_state(struct sk_buff *,
extern int notify_device_state(struct sk_buff *,
unsigned int,
struct drbd_device *,
struct device_info *,
enum drbd_notification_type);
extern void notify_connection_state(struct sk_buff *,
extern int notify_connection_state(struct sk_buff *,
unsigned int,
struct drbd_connection *,
struct connection_info *,
enum drbd_notification_type);
extern void notify_peer_device_state(struct sk_buff *,
extern int notify_peer_device_state(struct sk_buff *,
unsigned int,
struct drbd_peer_device *,
struct peer_device_info *,

41
drivers/block/drbd/drbd_nl.c
View File

@ -4611,7 +4611,7 @@ static int nla_put_notification_header(struct sk_buff *msg,
return drbd_notification_header_to_skb(msg, &nh, true);
}
void notify_resource_state(struct sk_buff *skb,
int notify_resource_state(struct sk_buff *skb,
unsigned int seq,
struct drbd_resource *resource,
struct resource_info *resource_info,
@ -4653,16 +4653,17 @@ void notify_resource_state(struct sk_buff *skb,
if (err && err != -ESRCH)
goto failed;
}
return;
return 0;
nla_put_failure:
nlmsg_free(skb);
failed:
drbd_err(resource, "Error %d while broadcasting event. Event seq:%u\n",
err, seq);
return err;
}
void notify_device_state(struct sk_buff *skb,
int notify_device_state(struct sk_buff *skb,
unsigned int seq,
struct drbd_device *device,
struct device_info *device_info,
@ -4702,16 +4703,17 @@ void notify_device_state(struct sk_buff *skb,
if (err && err != -ESRCH)
goto failed;
}
return;
return 0;
nla_put_failure:
nlmsg_free(skb);
failed:
drbd_err(device, "Error %d while broadcasting event. Event seq:%u\n",
err, seq);
return err;
}
void notify_connection_state(struct sk_buff *skb,
int notify_connection_state(struct sk_buff *skb,
unsigned int seq,
struct drbd_connection *connection,
struct connection_info *connection_info,
@ -4751,16 +4753,17 @@ void notify_connection_state(struct sk_buff *skb,
if (err && err != -ESRCH)
goto failed;
}
return;
return 0;
nla_put_failure:
nlmsg_free(skb);
failed:
drbd_err(connection, "Error %d while broadcasting event. Event seq:%u\n",
err, seq);
return err;
}
void notify_peer_device_state(struct sk_buff *skb,
int notify_peer_device_state(struct sk_buff *skb,
unsigned int seq,
struct drbd_peer_device *peer_device,
struct peer_device_info *peer_device_info,
@ -4801,13 +4804,14 @@ void notify_peer_device_state(struct sk_buff *skb,
if (err && err != -ESRCH)
goto failed;
}
return;
return 0;
nla_put_failure:
nlmsg_free(skb);
failed:
drbd_err(peer_device, "Error %d while broadcasting event. Event seq:%u\n",
err, seq);
return err;
}
void notify_helper(enum drbd_notification_type type,
@ -4858,7 +4862,7 @@ fail:
err, seq);
}
static void notify_initial_state_done(struct sk_buff *skb, unsigned int seq)
static int notify_initial_state_done(struct sk_buff *skb, unsigned int seq)
{
struct drbd_genlmsghdr *dh;
int err;
@ -4872,11 +4876,12 @@ static void notify_initial_state_done(struct sk_buff *skb, unsigned int seq)
if (nla_put_notification_header(skb, NOTIFY_EXISTS))
goto nla_put_failure;
genlmsg_end(skb, dh);
return;
return 0;
nla_put_failure:
nlmsg_free(skb);
pr_err("Error %d sending event. Event seq:%u\n", err, seq);
return err;
}
static void free_state_changes(struct list_head *list)
@ -4903,6 +4908,7 @@ static int get_initial_state(struct sk_buff *skb, struct netlink_callback *cb)
unsigned int seq = cb->args[2];
unsigned int n;
enum drbd_notification_type flags = 0;
int err = 0;
/* There is no need for taking notification_mutex here: it doesn't
matter if the initial state events mix with later state chage
@ -4911,32 +4917,32 @@ static int get_initial_state(struct sk_buff *skb, struct netlink_callback *cb)
cb->args[5]--;
if (cb->args[5] == 1) {
notify_initial_state_done(skb, seq);
err = notify_initial_state_done(skb, seq);
goto out;
}
n = cb->args[4]++;
if (cb->args[4] < cb->args[3])
flags |= NOTIFY_CONTINUES;
if (n < 1) {
notify_resource_state_change(skb, seq, state_change->resource,
err = notify_resource_state_change(skb, seq, state_change->resource,
NOTIFY_EXISTS | flags);
goto next;
}
n--;
if (n < state_change->n_connections) {
notify_connection_state_change(skb, seq, &state_change->connections[n],
err = notify_connection_state_change(skb, seq, &state_change->connections[n],
NOTIFY_EXISTS | flags);
goto next;
}
n -= state_change->n_connections;
if (n < state_change->n_devices) {
notify_device_state_change(skb, seq, &state_change->devices[n],
err = notify_device_state_change(skb, seq, &state_change->devices[n],
NOTIFY_EXISTS | flags);
goto next;
}
n -= state_change->n_devices;
if (n < state_change->n_devices * state_change->n_connections) {
notify_peer_device_state_change(skb, seq, &state_change->peer_devices[n],
err = notify_peer_device_state_change(skb, seq, &state_change->peer_devices[n],
NOTIFY_EXISTS | flags);
goto next;
}
@ -4951,7 +4957,10 @@ next:
cb->args[4] = 0;
}
out:
return skb->len;
if (err)
return err;
else
return skb->len;
}
int drbd_adm_get_initial_state(struct sk_buff *skb, struct netlink_callback *cb)

18
drivers/block/drbd/drbd_state.c
View File

@ -1505,7 +1505,7 @@ int drbd_bitmap_io_from_worker(struct drbd_device *device,
return rv;
}
void notify_resource_state_change(struct sk_buff *skb,
int notify_resource_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_resource_state_change *resource_state_change,
enum drbd_notification_type type)
@ -1518,10 +1518,10 @@ void notify_resource_state_change(struct sk_buff *skb,
.res_susp_fen = resource_state_change->susp_fen[NEW],
};
notify_resource_state(skb, seq, resource, &resource_info, type);
return notify_resource_state(skb, seq, resource, &resource_info, type);
}
void notify_connection_state_change(struct sk_buff *skb,
int notify_connection_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_connection_state_change *connection_state_change,
enum drbd_notification_type type)
@ -1532,10 +1532,10 @@ void notify_connection_state_change(struct sk_buff *skb,
.conn_role = connection_state_change->peer_role[NEW],
};
notify_connection_state(skb, seq, connection, &connection_info, type);
return notify_connection_state(skb, seq, connection, &connection_info, type);
}
void notify_device_state_change(struct sk_buff *skb,
int notify_device_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_device_state_change *device_state_change,
enum drbd_notification_type type)
@ -1545,10 +1545,10 @@ void notify_device_state_change(struct sk_buff *skb,
.dev_disk_state = device_state_change->disk_state[NEW],
};
notify_device_state(skb, seq, device, &device_info, type);
return notify_device_state(skb, seq, device, &device_info, type);
}
void notify_peer_device_state_change(struct sk_buff *skb,
int notify_peer_device_state_change(struct sk_buff *skb,
unsigned int seq,
struct drbd_peer_device_state_change *p,
enum drbd_notification_type type)
@ -1562,7 +1562,7 @@ void notify_peer_device_state_change(struct sk_buff *skb,
.peer_resync_susp_dependency = p->resync_susp_dependency[NEW],
};
notify_peer_device_state(skb, seq, peer_device, &peer_device_info, type);
return notify_peer_device_state(skb, seq, peer_device, &peer_device_info, type);
}
static void broadcast_state_change(struct drbd_state_change *state_change)
@ -1570,7 +1570,7 @@ static void broadcast_state_change(struct drbd_state_change *state_change)
struct drbd_resource_state_change *resource_state_change = &state_change->resource[0];
bool resource_state_has_changed;
unsigned int n_device, n_connection, n_peer_device, n_peer_devices;
void (*last_func)(struct sk_buff *, unsigned int, void *,
int (*last_func)(struct sk_buff *, unsigned int, void *,
enum drbd_notification_type) = NULL;
void *uninitialized_var(last_arg);

8
drivers/block/drbd/drbd_state_change.h
View File

@ -43,19 +43,19 @@ extern struct drbd_state_change *remember_old_state(struct drbd_resource *, gfp_
extern void copy_old_to_new_state_change(struct drbd_state_change *);
extern void forget_state_change(struct drbd_state_change *);
extern void notify_resource_state_change(struct sk_buff *,
extern int notify_resource_state_change(struct sk_buff *,
unsigned int,
struct drbd_resource_state_change *,
enum drbd_notification_type type);
extern void notify_connection_state_change(struct sk_buff *,
extern int notify_connection_state_change(struct sk_buff *,
unsigned int,
struct drbd_connection_state_change *,
enum drbd_notification_type type);
extern void notify_device_state_change(struct sk_buff *,
extern int notify_device_state_change(struct sk_buff *,
unsigned int,
struct drbd_device_state_change *,
enum drbd_notification_type type);
extern void notify_peer_device_state_change(struct sk_buff *,
extern int notify_peer_device_state_change(struct sk_buff *,
unsigned int,
struct drbd_peer_device_state_change *,
enum drbd_notification_type type);