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mptcp: use the workqueue to destroy unaccepted sockets
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Christoph reported a UaF at token lookup time after having
refactored the passive socket initialization part:

  BUG: KASAN: use-after-free in __token_bucket_busy+0x253/0x260
  Read of size 4 at addr ffff88810698d5b0 by task syz-executor653/3198

  CPU: 1 PID: 3198 Comm: syz-executor653 Not tainted 6.2.0-rc59af4eaa31c1f6c00c8f1e448ed99a45c66340dd5 #6
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  Call Trace:
   <TASK>
   dump_stack_lvl+0x6e/0x91
   print_report+0x16a/0x46f
   kasan_report+0xad/0x130
   __token_bucket_busy+0x253/0x260
   mptcp_token_new_connect+0x13d/0x490
   mptcp_connect+0x4ed/0x860
   __inet_stream_connect+0x80e/0xd90
   tcp_sendmsg_fastopen+0x3ce/0x710
   mptcp_sendmsg+0xff1/0x1a20
   inet_sendmsg+0x11d/0x140
   __sys_sendto+0x405/0x490
   __x64_sys_sendto+0xdc/0x1b0
   do_syscall_64+0x3b/0x90
   entry_SYSCALL_64_after_hwframe+0x72/0xdc

We need to properly clean-up all the paired MPTCP-level
resources and be sure to release the msk last, even when
the unaccepted subflow is destroyed by the TCP internals
via inet_child_forget().

We can re-use the existing MPTCP_WORK_CLOSE_SUBFLOW infra,
explicitly checking that for the critical scenario: the
closed subflow is the MPC one, the msk is not accepted and
eventually going through full cleanup.

With such change, __mptcp_destroy_sock() is always called
on msk sockets, even on accepted ones. We don't need anymore
to transiently drop one sk reference at msk clone time.

Please note this commit depends on the parent one:

  mptcp: refactor passive socket initialization

Fixes: 58b0991 ("mptcp: create msk early")
Cc: stable@vger.kernel.org
Reported-and-tested-by: Christoph Paasch <cpaasch@apple.com>
Closes: multipath-tcp/mptcp_net-next#347
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Paolo Abeni authored and kuba-moo committed Mar 11, 2023
1 parent 3a236ae commit b6985b9
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Showing 3 changed files with 46 additions and 16 deletions.
40 changes: 30 additions & 10 deletions net/mptcp/protocol.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2342,15 +2342,27 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
goto out;
}

sock_orphan(ssk);
subflow->disposable = 1;

/* if ssk hit tcp_done(), tcp_cleanup_ulp() cleared the related ops
* the ssk has been already destroyed, we just need to release the
* reference owned by msk;
*/
if (!inet_csk(ssk)->icsk_ulp_ops) {
WARN_ON_ONCE(!sock_flag(ssk, SOCK_DEAD));
kfree_rcu(subflow, rcu);
} else if (msk->in_accept_queue && msk->first == ssk) {
/* if the first subflow moved to a close state, e.g. due to
* incoming reset and we reach here before inet_child_forget()
* the TCP stack could later try to close it via
* inet_csk_listen_stop(), or deliver it to the user space via
* accept().
* We can't delete the subflow - or risk a double free - nor let
* the msk survive - or will be leaked in the non accept scenario:
* fallback and let TCP cope with the subflow cleanup.
*/
WARN_ON_ONCE(sock_flag(ssk, SOCK_DEAD));
mptcp_subflow_drop_ctx(ssk);
} else {
/* otherwise tcp will dispose of the ssk and subflow ctx */
if (ssk->sk_state == TCP_LISTEN) {
Expand Down Expand Up @@ -2398,9 +2410,10 @@ static unsigned int mptcp_sync_mss(struct sock *sk, u32 pmtu)
return 0;
}

static void __mptcp_close_subflow(struct mptcp_sock *msk)
static void __mptcp_close_subflow(struct sock *sk)
{
struct mptcp_subflow_context *subflow, *tmp;
struct mptcp_sock *msk = mptcp_sk(sk);

might_sleep();

Expand All @@ -2414,7 +2427,15 @@ static void __mptcp_close_subflow(struct mptcp_sock *msk)
if (!skb_queue_empty_lockless(&ssk->sk_receive_queue))
continue;

mptcp_close_ssk((struct sock *)msk, ssk, subflow);
mptcp_close_ssk(sk, ssk, subflow);
}

/* if the MPC subflow has been closed before the msk is accepted,
* msk will never be accept-ed, close it now
*/
if (!msk->first && msk->in_accept_queue) {
sock_set_flag(sk, SOCK_DEAD);
inet_sk_state_store(sk, TCP_CLOSE);
}
}

Expand Down Expand Up @@ -2623,6 +2644,9 @@ static void mptcp_worker(struct work_struct *work)
__mptcp_check_send_data_fin(sk);
mptcp_check_data_fin(sk);

if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags))
__mptcp_close_subflow(sk);

/* There is no point in keeping around an orphaned sk timedout or
* closed, but we need the msk around to reply to incoming DATA_FIN,
* even if it is orphaned and in FIN_WAIT2 state
Expand All @@ -2638,9 +2662,6 @@ static void mptcp_worker(struct work_struct *work)
}
}

if (test_and_clear_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags))
__mptcp_close_subflow(msk);

if (test_and_clear_bit(MPTCP_WORK_RTX, &msk->flags))
__mptcp_retrans(sk);

Expand Down Expand Up @@ -3078,6 +3099,7 @@ struct sock *mptcp_sk_clone(const struct sock *sk,
msk->local_key = subflow_req->local_key;
msk->token = subflow_req->token;
msk->subflow = NULL;
msk->in_accept_queue = 1;
WRITE_ONCE(msk->fully_established, false);
if (mp_opt->suboptions & OPTION_MPTCP_CSUMREQD)
WRITE_ONCE(msk->csum_enabled, true);
Expand All @@ -3095,8 +3117,7 @@ struct sock *mptcp_sk_clone(const struct sock *sk,
security_inet_csk_clone(nsk, req);
bh_unlock_sock(nsk);

/* keep a single reference */
__sock_put(nsk);
/* note: the newly allocated socket refcount is 2 now */
return nsk;
}

Expand Down Expand Up @@ -3152,8 +3173,6 @@ static struct sock *mptcp_accept(struct sock *sk, int flags, int *err,
goto out;
}

/* acquire the 2nd reference for the owning socket */
sock_hold(new_mptcp_sock);
newsk = new_mptcp_sock;
MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEACK);
} else {
Expand Down Expand Up @@ -3704,6 +3723,7 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
struct sock *newsk = newsock->sk;

set_bit(SOCK_CUSTOM_SOCKOPT, &newsock->flags);
msk->in_accept_queue = 0;

lock_sock(newsk);

Expand Down
5 changes: 4 additions & 1 deletion net/mptcp/protocol.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -295,7 +295,8 @@ struct mptcp_sock {
u8 recvmsg_inq:1,
cork:1,
nodelay:1,
fastopening:1;
fastopening:1,
in_accept_queue:1;
int connect_flags;
struct work_struct work;
struct sk_buff *ooo_last_skb;
Expand Down Expand Up @@ -666,6 +667,8 @@ void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow);

bool mptcp_subflow_active(struct mptcp_subflow_context *subflow);

void mptcp_subflow_drop_ctx(struct sock *ssk);

static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
struct mptcp_subflow_context *ctx)
{
Expand Down
17 changes: 12 additions & 5 deletions net/mptcp/subflow.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -699,9 +699,10 @@ static bool subflow_hmac_valid(const struct request_sock *req,

static void mptcp_force_close(struct sock *sk)
{
/* the msk is not yet exposed to user-space */
/* the msk is not yet exposed to user-space, and refcount is 2 */
inet_sk_state_store(sk, TCP_CLOSE);
sk_common_release(sk);
sock_put(sk);
}

static void subflow_ulp_fallback(struct sock *sk,
Expand All @@ -717,7 +718,7 @@ static void subflow_ulp_fallback(struct sock *sk,
mptcp_subflow_ops_undo_override(sk);
}

static void subflow_drop_ctx(struct sock *ssk)
void mptcp_subflow_drop_ctx(struct sock *ssk)
{
struct mptcp_subflow_context *ctx = mptcp_subflow_ctx(ssk);

Expand Down Expand Up @@ -823,7 +824,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,

if (new_msk)
mptcp_copy_inaddrs(new_msk, child);
subflow_drop_ctx(child);
mptcp_subflow_drop_ctx(child);
goto out;
}

Expand Down Expand Up @@ -914,7 +915,7 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
return child;

dispose_child:
subflow_drop_ctx(child);
mptcp_subflow_drop_ctx(child);
tcp_rsk(req)->drop_req = true;
inet_csk_prepare_for_destroy_sock(child);
tcp_done(child);
Expand Down Expand Up @@ -1866,7 +1867,6 @@ void mptcp_subflow_queue_clean(struct sock *listener_sk, struct sock *listener_s
struct sock *sk = (struct sock *)msk;
bool do_cancel_work;

sock_hold(sk);
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
next = msk->dl_next;
msk->first = NULL;
Expand Down Expand Up @@ -1954,6 +1954,13 @@ static void subflow_ulp_release(struct sock *ssk)
* when the subflow is still unaccepted
*/
release = ctx->disposable || list_empty(&ctx->node);

/* inet_child_forget() does not call sk_state_change(),
* explicitly trigger the socket close machinery
*/
if (!release && !test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW,
&mptcp_sk(sk)->flags))
mptcp_schedule_work(sk);
sock_put(sk);
}

Expand Down

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