netdev - [PATCH net] sctp: prevent possible shift-out-of-bounds in sctp_transport_update

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Message-ID: <20251106111054.3288127-1-edumazet@google.com>
Date: Thu,  6 Nov 2025 11:10:54 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Marcelo Ricardo Leitner <marcelo.leitner@...il.com>, 
	Xin Long <lucien.xin@...il.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>, syzbot+f8c46c8b2b7f6e076e99@...kaller.appspotmail.com, 
	Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH net] sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto

syzbot reported a possible shift-out-of-bounds [1]

Blamed commit added rto_alpha_max and rto_beta_max set to 1000.

It is unclear if some sctp users are setting very large rto_alpha
and/or rto_beta.

In order to prevent user regression, perform the test at run time.

Also add READ_ONCE() annotations as sysctl values can change under us.

[1]

UBSAN: shift-out-of-bounds in net/sctp/transport.c:509:41
shift exponent 64 is too large for 32-bit type 'unsigned int'
CPU: 0 UID: 0 PID: 16704 Comm: syz.2.2320 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
  __dump_stack lib/dump_stack.c:94 [inline]
  dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
  ubsan_epilogue lib/ubsan.c:233 [inline]
  __ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494
  sctp_transport_update_rto.cold+0x1c/0x34b net/sctp/transport.c:509
  sctp_check_transmitted+0x11c4/0x1c30 net/sctp/outqueue.c:1502
  sctp_outq_sack+0x4ef/0x1b20 net/sctp/outqueue.c:1338
  sctp_cmd_process_sack net/sctp/sm_sideeffect.c:840 [inline]
  sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1372 [inline]

Fixes: b58537a1f562 ("net: sctp: fix permissions for rto_alpha and rto_beta knobs")
Reported-by: syzbot+f8c46c8b2b7f6e076e99@...kaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/690c81ae.050a0220.3d0d33.014e.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
---
 net/sctp/transport.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 0d48c61fe6adefc1a9c56ca1b8ab00072825d9e6..0c56d9673cc137e3f1a64311e79bd41db2cb1282 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -486,6 +486,7 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
 
 	if (tp->rttvar || tp->srtt) {
 		struct net *net = tp->asoc->base.net;
+		unsigned int rto_beta, rto_alpha;
 		/* 6.3.1 C3) When a new RTT measurement R' is made, set
 		 * RTTVAR <- (1 - RTO.Beta) * RTTVAR + RTO.Beta * |SRTT - R'|
 		 * SRTT <- (1 - RTO.Alpha) * SRTT + RTO.Alpha * R'
@@ -497,10 +498,14 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
 		 * For example, assuming the default value of RTO.Alpha of
 		 * 1/8, rto_alpha would be expressed as 3.
 		 */
-		tp->rttvar = tp->rttvar - (tp->rttvar >> net->sctp.rto_beta)
-			+ (((__u32)abs((__s64)tp->srtt - (__s64)rtt)) >> net->sctp.rto_beta);
-		tp->srtt = tp->srtt - (tp->srtt >> net->sctp.rto_alpha)
-			+ (rtt >> net->sctp.rto_alpha);
+		rto_beta = READ_ONCE(net->sctp.rto_beta);
+		if (rto_beta < 32)
+			tp->rttvar = tp->rttvar - (tp->rttvar >> rto_beta)
+				+ (((__u32)abs((__s64)tp->srtt - (__s64)rtt)) >> rto_beta);
+		rto_alpha = READ_ONCE(net->sctp.rto_alpha);
+		if (rto_alpha < 32)
+			tp->srtt = tp->srtt - (tp->srtt >> rto_alpha)
+				+ (rtt >> rto_alpha);
 	} else {
 		/* 6.3.1 C2) When the first RTT measurement R is made, set
 		 * SRTT <- R, RTTVAR <- R/2.
-- 
2.51.2.1026.g39e6a42477-goog