[PATCH 5.10 342/406] sctp: annotate data-races around sk->sk_wmem_queued

Greg Kroah-Hartman
2023-09-17T19:41:16Z

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit dc9511dd6f37fe803f6b15b61b030728d7057417 ]

sk->sk_wmem_queued can be read locklessly from sctp_poll()

Use sk_wmem_queued_add() when the field is changed,
and add READ_ONCE() annotations in sctp_writeable()
and sctp_assocs_seq_show()

syzbot reported:

BUG: KCSAN: data-race in sctp_poll / sctp_wfree

read-write to 0xffff888149d77810 of 4 bytes by interrupt on cpu 0:
sctp_wfree+0x170/0x4a0 net/sctp/socket.c:9147
skb_release_head_state+0xb7/0x1a0 net/core/skbuff.c:988
skb_release_all net/core/skbuff.c:1000 [inline]
__kfree_skb+0x16/0x140 net/core/skbuff.c:1016
consume_skb+0x57/0x180 net/core/skbuff.c:1232
sctp_chunk_destroy net/sctp/sm_make_chunk.c:1503 [inline]
sctp_chunk_put+0xcd/0x130 net/sctp/sm_make_chunk.c:1530
sctp_datamsg_put+0x29a/0x300 net/sctp/chunk.c:128
sctp_chunk_free+0x34/0x50 net/sctp/sm_make_chunk.c:1515
sctp_outq_sack+0xafa/0xd70 net/sctp/outqueue.c:1381
sctp_cmd_process_sack net/sctp/sm_sideeffect.c:834 [inline]
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1366 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
sctp_do_sm+0x12c7/0x31b0 net/sctp/sm_sideeffect.c:1169
sctp_assoc_bh_rcv+0x2b2/0x430 net/sctp/associola.c:1051
sctp_inq_push+0x108/0x120 net/sctp/inqueue.c:80
sctp_rcv+0x116e/0x1340 net/sctp/input.c:243
sctp6_rcv+0x25/0x40 net/sctp/ipv6.c:1120
ip6_protocol_deliver_rcu+0x92f/0xf30 net/ipv6/ip6_input.c:437
ip6_input_finish net/ipv6/ip6_input.c:482 [inline]
NF_HOOK include/linux/netfilter.h:303 [inline]
ip6_input+0xbd/0x1b0 net/ipv6/ip6_input.c:491
dst_input include/net/dst.h:468 [inline]
ip6_rcv_finish+0x1e2/0x2e0 net/ipv6/ip6_input.c:79
NF_HOOK include/linux/netfilter.h:303 [inline]
ipv6_rcv+0x74/0x150 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core net/core/dev.c:5452 [inline]
__netif_receive_skb+0x90/0x1b0 net/core/dev.c:5566
process_backlog+0x21f/0x380 net/core/dev.c:5894
__napi_poll+0x60/0x3b0 net/core/dev.c:6460
napi_poll net/core/dev.c:6527 [inline]
net_rx_action+0x32b/0x750 net/core/dev.c:6660
__do_softirq+0xc1/0x265 kernel/softirq.c:553
run_ksoftirqd+0x17/0x20 kernel/softirq.c:921
smpboot_thread_fn+0x30a/0x4a0 kernel/smpboot.c:164
kthread+0x1d7/0x210 kernel/kthread.c:389
ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff888149d77810 of 4 bytes by task 17828 on cpu 1:
sctp_writeable net/sctp/socket.c:9304 [inline]
sctp_poll+0x265/0x410 net/sctp/socket.c:8671
sock_poll+0x253/0x270 net/socket.c:1374
vfs_poll include/linux/poll.h:88 [inline]
do_pollfd fs/select.c:873 [inline]
do_poll fs/select.c:921 [inline]
do_sys_poll+0x636/0xc00 fs/select.c:1015
__do_sys_ppoll fs/select.c:1121 [inline]
__se_sys_ppoll+0x1af/0x1f0 fs/select.c:1101
__x64_sys_ppoll+0x67/0x80 fs/select.c:1101
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00019e80 -> 0x0000cc80

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17828 Comm: syz-executor.1 Not tainted 6.5.0-rc7-syzkaller-00185-g28f20a19294d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://lore.kernel.org/r/20230830094519.950007-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sctp/proc.c | 2 +-
net/sctp/socket.c | 10 +++++-----
2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index 982a87b3e11f8..963b94517ec20 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -284,7 +284,7 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
assoc->init_retries, assoc->shutdown_retries,
assoc->rtx_data_chunks,
refcount_read(&sk->sk_wmem_alloc),
- sk->sk_wmem_queued,
+ READ_ONCE(sk->sk_wmem_queued),
sk->sk_sndbuf,
sk->sk_rcvbuf);
seq_printf(seq, "\n");
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index fa4d31b507f29..68d53e3f0d07a 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -68,7 +68,7 @@
#include <net/sctp/stream_sched.h>

/* Forward declarations for internal helper functions. */
-static bool sctp_writeable(struct sock *sk);
+static bool sctp_writeable(const struct sock *sk);
static void sctp_wfree(struct sk_buff *skb);
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
size_t msg_len);
@@ -138,7 +138,7 @@ static inline void sctp_set_owner_w(struct sctp_chunk *chunk)

refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
- sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
+ sk_wmem_queued_add(sk, chunk->skb->truesize + sizeof(struct sctp_chunk));
sk_mem_charge(sk, chunk->skb->truesize);
}

@@ -8900,7 +8900,7 @@ static void sctp_wfree(struct sk_buff *skb)
struct sock *sk = asoc->base.sk;

sk_mem_uncharge(sk, skb->truesize);
- sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
+ sk_wmem_queued_add(sk, -(skb->truesize + sizeof(struct sctp_chunk)));
asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
&sk->sk_wmem_alloc));
@@ -9055,9 +9055,9 @@ void sctp_write_space(struct sock *sk)
* UDP-style sockets or TCP-style sockets, this code should work.
* - Daisy
*/
-static bool sctp_writeable(struct sock *sk)
+static bool sctp_writeable(const struct sock *sk)
{
- return sk->sk_sndbuf > sk->sk_wmem_queued;
+ return READ_ONCE(sk->sk_sndbuf) > READ_ONCE(sk->sk_wmem_queued);
}

/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
--
2.40.1