![David Howells](/assets/img/avatar_default.png)
[ Upstream commit 8c2f826dc3
]
Don't put buffers of data to be handed to crypto on the stack as this may
cause an assertion failure in the kernel (see below). Fix this by using an
kmalloc'd buffer instead.
kernel BUG at ./include/linux/scatterlist.h:147!
...
RIP: 0010:rxkad_encrypt_response.isra.6+0x191/0x1b0 [rxrpc]
RSP: 0018:ffffbe2fc06cfca8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff989277d59900 RCX: 0000000000000028
RDX: 0000259dc06cfd88 RSI: 0000000000000025 RDI: ffffbe30406cfd88
RBP: ffffbe2fc06cfd60 R08: ffffbe2fc06cfd08 R09: ffffbe2fc06cfd08
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff7c5f80d9f95
R13: ffffbe2fc06cfd88 R14: ffff98927a3f7aa0 R15: ffffbe2fc06cfd08
FS: 0000000000000000(0000) GS:ffff98927fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b1ff28f0f8 CR3: 000000001b412003 CR4: 00000000003606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rxkad_respond_to_challenge+0x297/0x330 [rxrpc]
rxrpc_process_connection+0xd1/0x690 [rxrpc]
? process_one_work+0x1c3/0x680
? __lock_is_held+0x59/0xa0
process_one_work+0x249/0x680
worker_thread+0x3a/0x390
? process_one_work+0x680/0x680
kthread+0x121/0x140
? kthread_create_worker_on_cpu+0x70/0x70
ret_from_fork+0x3a/0x50
Reported-by: Jonathan Billings <jsbillings@jsbillings.org>
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Jonathan Billings <jsbillings@jsbillings.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
432 lines
10 KiB
C
432 lines
10 KiB
C
/* connection-level event handling
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/errqueue.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include <net/ip.h>
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#include "ar-internal.h"
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/*
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* Retransmit terminal ACK or ABORT of the previous call.
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*/
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static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
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struct sk_buff *skb)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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struct rxrpc_channel *chan;
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struct msghdr msg;
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struct kvec iov;
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struct {
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struct rxrpc_wire_header whdr;
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union {
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struct {
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__be32 code;
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} abort;
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struct {
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struct rxrpc_ackpacket ack;
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u8 padding[3];
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struct rxrpc_ackinfo info;
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};
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};
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} __attribute__((packed)) pkt;
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size_t len;
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u32 serial, mtu, call_id;
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_enter("%d", conn->debug_id);
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chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
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/* If the last call got moved on whilst we were waiting to run, just
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* ignore this packet.
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*/
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call_id = READ_ONCE(chan->last_call);
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/* Sync with __rxrpc_disconnect_call() */
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smp_rmb();
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if (call_id != sp->hdr.callNumber)
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return;
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msg.msg_name = &conn->params.peer->srx.transport;
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msg.msg_namelen = conn->params.peer->srx.transport_len;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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pkt.whdr.epoch = htonl(sp->hdr.epoch);
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pkt.whdr.cid = htonl(sp->hdr.cid);
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pkt.whdr.callNumber = htonl(sp->hdr.callNumber);
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pkt.whdr.seq = 0;
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pkt.whdr.type = chan->last_type;
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pkt.whdr.flags = conn->out_clientflag;
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pkt.whdr.userStatus = 0;
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pkt.whdr.securityIndex = conn->security_ix;
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pkt.whdr._rsvd = 0;
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pkt.whdr.serviceId = htons(conn->service_id);
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len = sizeof(pkt.whdr);
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switch (chan->last_type) {
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case RXRPC_PACKET_TYPE_ABORT:
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pkt.abort.code = htonl(chan->last_abort);
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len += sizeof(pkt.abort);
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break;
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case RXRPC_PACKET_TYPE_ACK:
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mtu = conn->params.peer->if_mtu;
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mtu -= conn->params.peer->hdrsize;
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pkt.ack.bufferSpace = 0;
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pkt.ack.maxSkew = htons(skb->priority);
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pkt.ack.firstPacket = htonl(chan->last_seq);
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pkt.ack.previousPacket = htonl(chan->last_seq - 1);
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pkt.ack.serial = htonl(sp->hdr.serial);
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pkt.ack.reason = RXRPC_ACK_DUPLICATE;
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pkt.ack.nAcks = 0;
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pkt.info.rxMTU = htonl(rxrpc_rx_mtu);
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pkt.info.maxMTU = htonl(mtu);
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pkt.info.rwind = htonl(rxrpc_rx_window_size);
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pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
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pkt.whdr.flags |= RXRPC_SLOW_START_OK;
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len += sizeof(pkt.ack) + sizeof(pkt.info);
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break;
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}
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/* Resync with __rxrpc_disconnect_call() and check that the last call
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* didn't get advanced whilst we were filling out the packets.
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*/
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smp_rmb();
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if (READ_ONCE(chan->last_call) != call_id)
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return;
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iov.iov_base = &pkt;
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iov.iov_len = len;
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serial = atomic_inc_return(&conn->serial);
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pkt.whdr.serial = htonl(serial);
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switch (chan->last_type) {
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case RXRPC_PACKET_TYPE_ABORT:
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_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
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break;
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case RXRPC_PACKET_TYPE_ACK:
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trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0,
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RXRPC_ACK_DUPLICATE, 0);
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_proto("Tx ACK %%%u [re]", serial);
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break;
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}
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kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
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_leave("");
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return;
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}
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/*
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* pass a connection-level abort onto all calls on that connection
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*/
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static void rxrpc_abort_calls(struct rxrpc_connection *conn,
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enum rxrpc_call_completion compl,
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u32 abort_code, int error)
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{
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struct rxrpc_call *call;
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int i;
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_enter("{%d},%x", conn->debug_id, abort_code);
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spin_lock(&conn->channel_lock);
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for (i = 0; i < RXRPC_MAXCALLS; i++) {
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call = rcu_dereference_protected(
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conn->channels[i].call,
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lockdep_is_held(&conn->channel_lock));
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if (call) {
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if (compl == RXRPC_CALL_LOCALLY_ABORTED)
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trace_rxrpc_abort("CON", call->cid,
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call->call_id, 0,
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abort_code, error);
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if (rxrpc_set_call_completion(call, compl,
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abort_code, error))
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rxrpc_notify_socket(call);
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}
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}
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spin_unlock(&conn->channel_lock);
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_leave("");
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}
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/*
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* generate a connection-level abort
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*/
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static int rxrpc_abort_connection(struct rxrpc_connection *conn,
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int error, u32 abort_code)
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{
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struct rxrpc_wire_header whdr;
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struct msghdr msg;
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struct kvec iov[2];
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__be32 word;
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size_t len;
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u32 serial;
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int ret;
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_enter("%d,,%u,%u", conn->debug_id, error, abort_code);
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/* generate a connection-level abort */
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spin_lock_bh(&conn->state_lock);
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if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
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spin_unlock_bh(&conn->state_lock);
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_leave(" = 0 [already dead]");
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return 0;
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}
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conn->state = RXRPC_CONN_LOCALLY_ABORTED;
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spin_unlock_bh(&conn->state_lock);
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rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
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msg.msg_name = &conn->params.peer->srx.transport;
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msg.msg_namelen = conn->params.peer->srx.transport_len;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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whdr.epoch = htonl(conn->proto.epoch);
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whdr.cid = htonl(conn->proto.cid);
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whdr.callNumber = 0;
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whdr.seq = 0;
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whdr.type = RXRPC_PACKET_TYPE_ABORT;
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whdr.flags = conn->out_clientflag;
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whdr.userStatus = 0;
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whdr.securityIndex = conn->security_ix;
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whdr._rsvd = 0;
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whdr.serviceId = htons(conn->service_id);
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word = htonl(conn->local_abort);
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iov[0].iov_base = &whdr;
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iov[0].iov_len = sizeof(whdr);
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iov[1].iov_base = &word;
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iov[1].iov_len = sizeof(word);
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len = iov[0].iov_len + iov[1].iov_len;
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serial = atomic_inc_return(&conn->serial);
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whdr.serial = htonl(serial);
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_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
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ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
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if (ret < 0) {
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_debug("sendmsg failed: %d", ret);
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return -EAGAIN;
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}
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_leave(" = 0");
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return 0;
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}
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/*
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* mark a call as being on a now-secured channel
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* - must be called with BH's disabled.
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*/
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static void rxrpc_call_is_secure(struct rxrpc_call *call)
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{
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_enter("%p", call);
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if (call) {
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write_lock_bh(&call->state_lock);
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if (call->state == RXRPC_CALL_SERVER_SECURING) {
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call->state = RXRPC_CALL_SERVER_ACCEPTING;
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rxrpc_notify_socket(call);
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}
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write_unlock_bh(&call->state_lock);
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}
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}
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/*
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* connection-level Rx packet processor
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*/
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static int rxrpc_process_event(struct rxrpc_connection *conn,
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struct sk_buff *skb,
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u32 *_abort_code)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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__be32 wtmp;
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u32 abort_code;
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int loop, ret;
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if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
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_leave(" = -ECONNABORTED [%u]", conn->state);
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return -ECONNABORTED;
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}
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_enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
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switch (sp->hdr.type) {
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case RXRPC_PACKET_TYPE_DATA:
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case RXRPC_PACKET_TYPE_ACK:
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rxrpc_conn_retransmit_call(conn, skb);
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return 0;
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case RXRPC_PACKET_TYPE_BUSY:
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/* Just ignore BUSY packets for now. */
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return 0;
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case RXRPC_PACKET_TYPE_ABORT:
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if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
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&wtmp, sizeof(wtmp)) < 0) {
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trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
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tracepoint_string("bad_abort"));
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return -EPROTO;
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}
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abort_code = ntohl(wtmp);
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_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
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conn->state = RXRPC_CONN_REMOTELY_ABORTED;
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rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
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abort_code, -ECONNABORTED);
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return -ECONNABORTED;
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case RXRPC_PACKET_TYPE_CHALLENGE:
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return conn->security->respond_to_challenge(conn, skb,
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_abort_code);
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case RXRPC_PACKET_TYPE_RESPONSE:
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ret = conn->security->verify_response(conn, skb, _abort_code);
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if (ret < 0)
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return ret;
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ret = conn->security->init_connection_security(conn);
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if (ret < 0)
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return ret;
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ret = conn->security->prime_packet_security(conn);
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if (ret < 0)
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return ret;
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spin_lock(&conn->channel_lock);
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spin_lock(&conn->state_lock);
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if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
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conn->state = RXRPC_CONN_SERVICE;
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spin_unlock(&conn->state_lock);
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for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
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rxrpc_call_is_secure(
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rcu_dereference_protected(
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conn->channels[loop].call,
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lockdep_is_held(&conn->channel_lock)));
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} else {
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spin_unlock(&conn->state_lock);
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}
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spin_unlock(&conn->channel_lock);
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return 0;
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default:
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trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
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tracepoint_string("bad_conn_pkt"));
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return -EPROTO;
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}
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}
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/*
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* set up security and issue a challenge
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*/
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static void rxrpc_secure_connection(struct rxrpc_connection *conn)
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{
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u32 abort_code;
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int ret;
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_enter("{%d}", conn->debug_id);
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ASSERT(conn->security_ix != 0);
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if (!conn->params.key) {
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_debug("set up security");
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ret = rxrpc_init_server_conn_security(conn);
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switch (ret) {
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case 0:
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break;
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case -ENOENT:
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abort_code = RX_CALL_DEAD;
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goto abort;
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default:
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abort_code = RXKADNOAUTH;
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goto abort;
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}
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}
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if (conn->security->issue_challenge(conn) < 0) {
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abort_code = RX_CALL_DEAD;
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ret = -ENOMEM;
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goto abort;
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}
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_leave("");
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return;
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abort:
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_debug("abort %d, %d", ret, abort_code);
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rxrpc_abort_connection(conn, ret, abort_code);
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_leave(" [aborted]");
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}
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/*
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* connection-level event processor
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*/
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void rxrpc_process_connection(struct work_struct *work)
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{
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struct rxrpc_connection *conn =
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container_of(work, struct rxrpc_connection, processor);
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struct sk_buff *skb;
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u32 abort_code = RX_PROTOCOL_ERROR;
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int ret;
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rxrpc_see_connection(conn);
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if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
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rxrpc_secure_connection(conn);
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/* go through the conn-level event packets, releasing the ref on this
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* connection that each one has when we've finished with it */
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while ((skb = skb_dequeue(&conn->rx_queue))) {
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rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
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ret = rxrpc_process_event(conn, skb, &abort_code);
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switch (ret) {
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case -EPROTO:
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case -EKEYEXPIRED:
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case -EKEYREJECTED:
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goto protocol_error;
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case -ENOMEM:
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case -EAGAIN:
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goto requeue_and_leave;
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case -ECONNABORTED:
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default:
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rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
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break;
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}
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}
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out:
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rxrpc_put_connection(conn);
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_leave("");
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return;
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requeue_and_leave:
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skb_queue_head(&conn->rx_queue, skb);
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goto out;
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protocol_error:
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if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
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goto requeue_and_leave;
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rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
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goto out;
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}
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