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![Takeshi Misawa](/assets/img/avatar_default.png)
Commit9ebeddef58
("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record") Then release ref in __rxrpc_put_peer and rxrpc_put_peer_locked. struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp) - peer->local = local; + peer->local = rxrpc_get_local(local); rxrpc_discard_prealloc also need ref release in discarding. syzbot report: BUG: memory leak unreferenced object 0xffff8881080ddc00 (size 256): comm "syz-executor339", pid 8462, jiffies 4294942238 (age 12.350s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 0a 00 00 00 00 c0 00 08 81 88 ff ff ................ backtrace: [<000000002b6e495f>] kmalloc include/linux/slab.h:552 [inline] [<000000002b6e495f>] kzalloc include/linux/slab.h:682 [inline] [<000000002b6e495f>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline] [<000000002b6e495f>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244 [<000000006b43a77b>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149 [<00000000fd447a55>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64 [<000000007fd8867c>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126 [<0000000063d80ec1>] ops_init+0x4e/0x190 net/core/net_namespace.c:152 [<00000000073c5efa>] setup_net+0xde/0x2d0 net/core/net_namespace.c:342 [<00000000a6744d5b>] copy_net_ns+0x19f/0x3e0 net/core/net_namespace.c:483 [<0000000017d3aec3>] create_new_namespaces+0x199/0x4f0 kernel/nsproxy.c:110 [<00000000186271ef>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226 [<000000002de7bac4>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2957 [<00000000349b12ba>] __do_sys_unshare kernel/fork.c:3025 [inline] [<00000000349b12ba>] __se_sys_unshare kernel/fork.c:3023 [inline] [<00000000349b12ba>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3023 [<000000006d178ef7>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 [<00000000637076d4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes:9ebeddef58
("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record") Signed-off-by: Takeshi Misawa <jeliantsurux@gmail.com> Reported-and-tested-by: syzbot+305326672fed51b205f7@syzkaller.appspotmail.com Signed-off-by: David Howells <dhowells@redhat.com> Link: https://lore.kernel.org/r/161183091692.3506637.3206605651502458810.stgit@warthog.procyon.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>
491 lines
14 KiB
C
491 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* incoming call 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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#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 <linux/udp.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/icmp.h>
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#include <linux/gfp.h>
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#include <linux/circ_buf.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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static void rxrpc_dummy_notify(struct sock *sk, struct rxrpc_call *call,
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unsigned long user_call_ID)
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{
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}
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/*
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* Preallocate a single service call, connection and peer and, if possible,
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* give them a user ID and attach the user's side of the ID to them.
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*/
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static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
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struct rxrpc_backlog *b,
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rxrpc_notify_rx_t notify_rx,
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rxrpc_user_attach_call_t user_attach_call,
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unsigned long user_call_ID, gfp_t gfp,
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unsigned int debug_id)
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{
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const void *here = __builtin_return_address(0);
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struct rxrpc_call *call, *xcall;
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struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
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struct rb_node *parent, **pp;
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int max, tmp;
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unsigned int size = RXRPC_BACKLOG_MAX;
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unsigned int head, tail, call_head, call_tail;
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max = rx->sk.sk_max_ack_backlog;
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tmp = rx->sk.sk_ack_backlog;
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if (tmp >= max) {
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_leave(" = -ENOBUFS [full %u]", max);
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return -ENOBUFS;
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}
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max -= tmp;
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/* We don't need more conns and peers than we have calls, but on the
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* other hand, we shouldn't ever use more peers than conns or conns
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* than calls.
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*/
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call_head = b->call_backlog_head;
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call_tail = READ_ONCE(b->call_backlog_tail);
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tmp = CIRC_CNT(call_head, call_tail, size);
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if (tmp >= max) {
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_leave(" = -ENOBUFS [enough %u]", tmp);
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return -ENOBUFS;
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}
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max = tmp + 1;
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head = b->peer_backlog_head;
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tail = READ_ONCE(b->peer_backlog_tail);
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if (CIRC_CNT(head, tail, size) < max) {
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struct rxrpc_peer *peer = rxrpc_alloc_peer(rx->local, gfp);
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if (!peer)
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return -ENOMEM;
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b->peer_backlog[head] = peer;
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smp_store_release(&b->peer_backlog_head,
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(head + 1) & (size - 1));
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}
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head = b->conn_backlog_head;
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tail = READ_ONCE(b->conn_backlog_tail);
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if (CIRC_CNT(head, tail, size) < max) {
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struct rxrpc_connection *conn;
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conn = rxrpc_prealloc_service_connection(rxnet, gfp);
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if (!conn)
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return -ENOMEM;
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b->conn_backlog[head] = conn;
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smp_store_release(&b->conn_backlog_head,
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(head + 1) & (size - 1));
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trace_rxrpc_conn(conn->debug_id, rxrpc_conn_new_service,
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atomic_read(&conn->usage), here);
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}
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/* Now it gets complicated, because calls get registered with the
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* socket here, with a user ID preassigned by the user.
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*/
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call = rxrpc_alloc_call(rx, gfp, debug_id);
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if (!call)
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return -ENOMEM;
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call->flags |= (1 << RXRPC_CALL_IS_SERVICE);
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call->state = RXRPC_CALL_SERVER_PREALLOC;
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trace_rxrpc_call(call->debug_id, rxrpc_call_new_service,
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atomic_read(&call->usage),
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here, (const void *)user_call_ID);
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write_lock(&rx->call_lock);
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/* Check the user ID isn't already in use */
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pp = &rx->calls.rb_node;
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parent = NULL;
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while (*pp) {
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parent = *pp;
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xcall = rb_entry(parent, struct rxrpc_call, sock_node);
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if (user_call_ID < xcall->user_call_ID)
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pp = &(*pp)->rb_left;
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else if (user_call_ID > xcall->user_call_ID)
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pp = &(*pp)->rb_right;
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else
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goto id_in_use;
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}
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call->user_call_ID = user_call_ID;
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call->notify_rx = notify_rx;
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if (user_attach_call) {
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rxrpc_get_call(call, rxrpc_call_got_kernel);
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user_attach_call(call, user_call_ID);
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}
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rxrpc_get_call(call, rxrpc_call_got_userid);
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rb_link_node(&call->sock_node, parent, pp);
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rb_insert_color(&call->sock_node, &rx->calls);
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set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
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list_add(&call->sock_link, &rx->sock_calls);
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write_unlock(&rx->call_lock);
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rxnet = call->rxnet;
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write_lock(&rxnet->call_lock);
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list_add_tail(&call->link, &rxnet->calls);
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write_unlock(&rxnet->call_lock);
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b->call_backlog[call_head] = call;
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smp_store_release(&b->call_backlog_head, (call_head + 1) & (size - 1));
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_leave(" = 0 [%d -> %lx]", call->debug_id, user_call_ID);
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return 0;
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id_in_use:
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write_unlock(&rx->call_lock);
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rxrpc_cleanup_call(call);
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_leave(" = -EBADSLT");
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return -EBADSLT;
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}
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/*
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* Allocate the preallocation buffers for incoming service calls. These must
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* be charged manually.
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*/
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int rxrpc_service_prealloc(struct rxrpc_sock *rx, gfp_t gfp)
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{
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struct rxrpc_backlog *b = rx->backlog;
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if (!b) {
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b = kzalloc(sizeof(struct rxrpc_backlog), gfp);
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if (!b)
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return -ENOMEM;
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rx->backlog = b;
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}
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return 0;
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}
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/*
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* Discard the preallocation on a service.
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*/
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void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
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{
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struct rxrpc_backlog *b = rx->backlog;
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struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
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unsigned int size = RXRPC_BACKLOG_MAX, head, tail;
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if (!b)
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return;
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rx->backlog = NULL;
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/* Make sure that there aren't any incoming calls in progress before we
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* clear the preallocation buffers.
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*/
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spin_lock_bh(&rx->incoming_lock);
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spin_unlock_bh(&rx->incoming_lock);
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head = b->peer_backlog_head;
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tail = b->peer_backlog_tail;
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while (CIRC_CNT(head, tail, size) > 0) {
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struct rxrpc_peer *peer = b->peer_backlog[tail];
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rxrpc_put_local(peer->local);
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kfree(peer);
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tail = (tail + 1) & (size - 1);
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}
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head = b->conn_backlog_head;
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tail = b->conn_backlog_tail;
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while (CIRC_CNT(head, tail, size) > 0) {
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struct rxrpc_connection *conn = b->conn_backlog[tail];
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write_lock(&rxnet->conn_lock);
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list_del(&conn->link);
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list_del(&conn->proc_link);
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write_unlock(&rxnet->conn_lock);
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kfree(conn);
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if (atomic_dec_and_test(&rxnet->nr_conns))
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wake_up_var(&rxnet->nr_conns);
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tail = (tail + 1) & (size - 1);
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}
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head = b->call_backlog_head;
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tail = b->call_backlog_tail;
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while (CIRC_CNT(head, tail, size) > 0) {
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struct rxrpc_call *call = b->call_backlog[tail];
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rcu_assign_pointer(call->socket, rx);
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if (rx->discard_new_call) {
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_debug("discard %lx", call->user_call_ID);
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rx->discard_new_call(call, call->user_call_ID);
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if (call->notify_rx)
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call->notify_rx = rxrpc_dummy_notify;
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rxrpc_put_call(call, rxrpc_call_put_kernel);
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}
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rxrpc_call_completed(call);
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rxrpc_release_call(rx, call);
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rxrpc_put_call(call, rxrpc_call_put);
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tail = (tail + 1) & (size - 1);
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}
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kfree(b);
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}
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/*
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* Ping the other end to fill our RTT cache and to retrieve the rwind
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* and MTU parameters.
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*/
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static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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ktime_t now = skb->tstamp;
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if (call->peer->rtt_count < 3 ||
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ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now))
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rxrpc_propose_ACK(call, RXRPC_ACK_PING, sp->hdr.serial,
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true, true,
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rxrpc_propose_ack_ping_for_params);
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}
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/*
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* Allocate a new incoming call from the prealloc pool, along with a connection
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* and a peer as necessary.
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*/
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static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
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struct rxrpc_local *local,
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struct rxrpc_peer *peer,
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struct rxrpc_connection *conn,
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const struct rxrpc_security *sec,
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struct sk_buff *skb)
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{
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struct rxrpc_backlog *b = rx->backlog;
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struct rxrpc_call *call;
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unsigned short call_head, conn_head, peer_head;
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unsigned short call_tail, conn_tail, peer_tail;
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unsigned short call_count, conn_count;
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/* #calls >= #conns >= #peers must hold true. */
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call_head = smp_load_acquire(&b->call_backlog_head);
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call_tail = b->call_backlog_tail;
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call_count = CIRC_CNT(call_head, call_tail, RXRPC_BACKLOG_MAX);
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conn_head = smp_load_acquire(&b->conn_backlog_head);
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conn_tail = b->conn_backlog_tail;
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conn_count = CIRC_CNT(conn_head, conn_tail, RXRPC_BACKLOG_MAX);
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ASSERTCMP(conn_count, >=, call_count);
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peer_head = smp_load_acquire(&b->peer_backlog_head);
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peer_tail = b->peer_backlog_tail;
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ASSERTCMP(CIRC_CNT(peer_head, peer_tail, RXRPC_BACKLOG_MAX), >=,
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conn_count);
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if (call_count == 0)
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return NULL;
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if (!conn) {
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if (peer && !rxrpc_get_peer_maybe(peer))
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peer = NULL;
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if (!peer) {
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peer = b->peer_backlog[peer_tail];
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if (rxrpc_extract_addr_from_skb(&peer->srx, skb) < 0)
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return NULL;
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b->peer_backlog[peer_tail] = NULL;
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smp_store_release(&b->peer_backlog_tail,
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(peer_tail + 1) &
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(RXRPC_BACKLOG_MAX - 1));
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rxrpc_new_incoming_peer(rx, local, peer);
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}
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/* Now allocate and set up the connection */
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conn = b->conn_backlog[conn_tail];
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b->conn_backlog[conn_tail] = NULL;
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smp_store_release(&b->conn_backlog_tail,
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(conn_tail + 1) & (RXRPC_BACKLOG_MAX - 1));
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conn->params.local = rxrpc_get_local(local);
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conn->params.peer = peer;
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rxrpc_see_connection(conn);
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rxrpc_new_incoming_connection(rx, conn, sec, skb);
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} else {
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rxrpc_get_connection(conn);
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}
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/* And now we can allocate and set up a new call */
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call = b->call_backlog[call_tail];
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b->call_backlog[call_tail] = NULL;
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smp_store_release(&b->call_backlog_tail,
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(call_tail + 1) & (RXRPC_BACKLOG_MAX - 1));
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rxrpc_see_call(call);
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call->conn = conn;
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call->security = conn->security;
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call->security_ix = conn->security_ix;
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call->peer = rxrpc_get_peer(conn->params.peer);
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call->cong_cwnd = call->peer->cong_cwnd;
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return call;
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}
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/*
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* Set up a new incoming call. Called in BH context with the RCU read lock
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* held.
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*
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* If this is for a kernel service, when we allocate the call, it will have
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* three refs on it: (1) the kernel service, (2) the user_call_ID tree, (3) the
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* retainer ref obtained from the backlog buffer. Prealloc calls for userspace
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* services only have the ref from the backlog buffer. We want to pass this
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* ref to non-BH context to dispose of.
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*
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* If we want to report an error, we mark the skb with the packet type and
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* abort code and return NULL.
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*
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* The call is returned with the user access mutex held.
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*/
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struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
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struct rxrpc_sock *rx,
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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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const struct rxrpc_security *sec = NULL;
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struct rxrpc_connection *conn;
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struct rxrpc_peer *peer = NULL;
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struct rxrpc_call *call = NULL;
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_enter("");
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spin_lock(&rx->incoming_lock);
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if (rx->sk.sk_state == RXRPC_SERVER_LISTEN_DISABLED ||
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rx->sk.sk_state == RXRPC_CLOSE) {
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trace_rxrpc_abort(0, "CLS", sp->hdr.cid, sp->hdr.callNumber,
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sp->hdr.seq, RX_INVALID_OPERATION, ESHUTDOWN);
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skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
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skb->priority = RX_INVALID_OPERATION;
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goto no_call;
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}
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/* The peer, connection and call may all have sprung into existence due
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* to a duplicate packet being handled on another CPU in parallel, so
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* we have to recheck the routing. However, we're now holding
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* rx->incoming_lock, so the values should remain stable.
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*/
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conn = rxrpc_find_connection_rcu(local, skb, &peer);
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if (!conn) {
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sec = rxrpc_get_incoming_security(rx, skb);
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if (!sec)
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goto no_call;
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}
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call = rxrpc_alloc_incoming_call(rx, local, peer, conn, sec, skb);
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if (!call) {
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skb->mark = RXRPC_SKB_MARK_REJECT_BUSY;
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goto no_call;
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}
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trace_rxrpc_receive(call, rxrpc_receive_incoming,
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sp->hdr.serial, sp->hdr.seq);
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/* Make the call live. */
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rxrpc_incoming_call(rx, call, skb);
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conn = call->conn;
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if (rx->notify_new_call)
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rx->notify_new_call(&rx->sk, call, call->user_call_ID);
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spin_lock(&conn->state_lock);
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switch (conn->state) {
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case RXRPC_CONN_SERVICE_UNSECURED:
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conn->state = RXRPC_CONN_SERVICE_CHALLENGING;
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set_bit(RXRPC_CONN_EV_CHALLENGE, &call->conn->events);
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rxrpc_queue_conn(call->conn);
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break;
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case RXRPC_CONN_SERVICE:
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write_lock(&call->state_lock);
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if (call->state < RXRPC_CALL_COMPLETE)
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call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
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write_unlock(&call->state_lock);
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break;
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|
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case RXRPC_CONN_REMOTELY_ABORTED:
|
|
rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
|
|
conn->abort_code, conn->error);
|
|
break;
|
|
case RXRPC_CONN_LOCALLY_ABORTED:
|
|
rxrpc_abort_call("CON", call, sp->hdr.seq,
|
|
conn->abort_code, conn->error);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
spin_unlock(&conn->state_lock);
|
|
spin_unlock(&rx->incoming_lock);
|
|
|
|
rxrpc_send_ping(call, skb);
|
|
|
|
/* We have to discard the prealloc queue's ref here and rely on a
|
|
* combination of the RCU read lock and refs held either by the socket
|
|
* (recvmsg queue, to-be-accepted queue or user ID tree) or the kernel
|
|
* service to prevent the call from being deallocated too early.
|
|
*/
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
|
|
_leave(" = %p{%d}", call, call->debug_id);
|
|
return call;
|
|
|
|
no_call:
|
|
spin_unlock(&rx->incoming_lock);
|
|
_leave(" = NULL [%u]", skb->mark);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Charge up socket with preallocated calls, attaching user call IDs.
|
|
*/
|
|
int rxrpc_user_charge_accept(struct rxrpc_sock *rx, unsigned long user_call_ID)
|
|
{
|
|
struct rxrpc_backlog *b = rx->backlog;
|
|
|
|
if (rx->sk.sk_state == RXRPC_CLOSE)
|
|
return -ESHUTDOWN;
|
|
|
|
return rxrpc_service_prealloc_one(rx, b, NULL, NULL, user_call_ID,
|
|
GFP_KERNEL,
|
|
atomic_inc_return(&rxrpc_debug_id));
|
|
}
|
|
|
|
/*
|
|
* rxrpc_kernel_charge_accept - Charge up socket with preallocated calls
|
|
* @sock: The socket on which to preallocate
|
|
* @notify_rx: Event notification function for the call
|
|
* @user_attach_call: Func to attach call to user_call_ID
|
|
* @user_call_ID: The tag to attach to the preallocated call
|
|
* @gfp: The allocation conditions.
|
|
* @debug_id: The tracing debug ID.
|
|
*
|
|
* Charge up the socket with preallocated calls, each with a user ID. A
|
|
* function should be provided to effect the attachment from the user's side.
|
|
* The user is given a ref to hold on the call.
|
|
*
|
|
* Note that the call may be come connected before this function returns.
|
|
*/
|
|
int rxrpc_kernel_charge_accept(struct socket *sock,
|
|
rxrpc_notify_rx_t notify_rx,
|
|
rxrpc_user_attach_call_t user_attach_call,
|
|
unsigned long user_call_ID, gfp_t gfp,
|
|
unsigned int debug_id)
|
|
{
|
|
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
|
|
struct rxrpc_backlog *b = rx->backlog;
|
|
|
|
if (sock->sk->sk_state == RXRPC_CLOSE)
|
|
return -ESHUTDOWN;
|
|
|
|
return rxrpc_service_prealloc_one(rx, b, notify_rx,
|
|
user_attach_call, user_call_ID,
|
|
gfp, debug_id);
|
|
}
|
|
EXPORT_SYMBOL(rxrpc_kernel_charge_accept);
|