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UPSTREAM: tipc: improve size validations for received domain records

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commit 9aa422ad326634b76309e8ff342c246800621216 upstream.

The function tipc_mon_rcv() allows a node to receive and process
domain_record structs from peer nodes to track their views of the
network topology.

This patch verifies that the number of members in a received domain
record does not exceed the limit defined by MAX_MON_DOMAIN, something
that may otherwise lead to a stack overflow.

tipc_mon_rcv() is called from the function tipc_link_proto_rcv(), where
we are reading a 32 bit message data length field into a uint16.  To
avert any risk of bit overflow, we add an extra sanity check for this in
that function.  We cannot see that happen with the current code, but
future designers being unaware of this risk, may introduce it by
allowing delivery of very large (> 64k) sk buffers from the bearer
layer.  This potential problem was identified by Eric Dumazet.

This fixes CVE-2022-0435

Reported-by: Samuel Page <samuel.page@appgate.com>
Reported-by: Eric Dumazet <edumazet@google.com>
Fixes: 35c55c9877 ("tipc: add neighbor monitoring framework")
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Samuel Page <samuel.page@appgate.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit d692e3406e)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I5da5bc6880456ec91e6d3f3a283d2c24b6cc269c
This commit is contained in:
Jon Maloy 2022-02-05 14:11:18 -05:00 committed by Greg Kroah-Hartman
parent 617c7432b5
commit 717add4ec8
2 changed files with 9 additions and 3 deletions

10
net/tipc/link.c
View File

@ -1953,15 +1953,18 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
u16 peers_tol = msg_link_tolerance(hdr);
u16 peers_prio = msg_linkprio(hdr);
u16 rcv_nxt = l->rcv_nxt;
u16 dlen = msg_data_sz(hdr);
u32 dlen = msg_data_sz(hdr), glen = 0;
int mtyp = msg_type(hdr);
bool reply = msg_probe(hdr);
u16 glen = 0;
void *data;
char *if_name;
int rc = 0;
trace_tipc_proto_rcv(skb, false, l->name);
if (dlen > U16_MAX)
goto exit;
if (tipc_link_is_blocked(l) || !xmitq)
goto exit;
@ -2063,7 +2066,8 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
if (glen != tipc_gap_ack_blks_sz(ga->gack_cnt))
ga = NULL;
}
if(glen > dlen)
break;
tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr,
&l->mon_state, l->bearer_id);

2
net/tipc/monitor.c
View File

@ -457,6 +457,8 @@ void tipc_mon_rcv(struct net *net, void *data, u16 dlen, u32 addr,
state->probing = false;
/* Sanity check received domain record */
if (new_member_cnt > MAX_MON_DOMAIN)
return;
if (dlen < dom_rec_len(arrv_dom, 0))
return;
if (dlen != dom_rec_len(arrv_dom, new_member_cnt))