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![Elena Reshetova](/assets/img/avatar_default.png)
atomic_t variables are currently used to implement reference counters with the following properties: - counter is initialized to 1 using atomic_set() - a resource is freed upon counter reaching zero - once counter reaches zero, its further increments aren't allowed - counter schema uses basic atomic operations (set, inc, inc_not_zero, dec_and_test, etc.) Such atomic variables should be converted to a newly provided refcount_t type and API that prevents accidental counter overflows and underflows. This is important since overflows and underflows can lead to use-after-free situation and be exploitable. The variable nsm_handle.sm_count is used as pure reference counter. Convert it to refcount_t and fix up the operations. **Important note for maintainers: Some functions from refcount_t API defined in lib/refcount.c have different memory ordering guarantees than their atomic counterparts. The full comparison can be seen in https://lkml.org/lkml/2017/11/15/57 and it is hopefully soon in state to be merged to the documentation tree. Normally the differences should not matter since refcount_t provides enough guarantees to satisfy the refcounting use cases, but in some rare cases it might matter. Please double check that you don't have some undocumented memory guarantees for this variable usage. For the nsm_handle.sm_count it might make a difference in following places: - nsm_release(): decrement in refcount_dec_and_lock() only provides RELEASE ordering, control dependency on success and holds a spin lock on success vs. fully ordered atomic counterpart. No change for the spin lock guarantees. Suggested-by: Kees Cook <keescook@chromium.org> Reviewed-by: David Windsor <dwindsor@gmail.com> Reviewed-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
577 lines
14 KiB
C
577 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/lockd/mon.c
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*
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* The kernel statd client.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/ktime.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/sunrpc/xprtsock.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/lockd/lockd.h>
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#include <asm/unaligned.h>
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#include "netns.h"
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#define NLMDBG_FACILITY NLMDBG_MONITOR
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#define NSM_PROGRAM 100024
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#define NSM_VERSION 1
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enum {
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NSMPROC_NULL,
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NSMPROC_STAT,
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NSMPROC_MON,
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NSMPROC_UNMON,
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NSMPROC_UNMON_ALL,
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NSMPROC_SIMU_CRASH,
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NSMPROC_NOTIFY,
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};
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struct nsm_args {
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struct nsm_private *priv;
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u32 prog; /* RPC callback info */
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u32 vers;
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u32 proc;
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char *mon_name;
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const char *nodename;
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};
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struct nsm_res {
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u32 status;
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u32 state;
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};
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static const struct rpc_program nsm_program;
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static DEFINE_SPINLOCK(nsm_lock);
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/*
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* Local NSM state
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*/
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u32 __read_mostly nsm_local_state;
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bool __read_mostly nsm_use_hostnames;
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static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
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{
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return (struct sockaddr *)&nsm->sm_addr;
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}
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static struct rpc_clnt *nsm_create(struct net *net, const char *nodename)
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{
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struct sockaddr_in sin = {
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.sin_family = AF_INET,
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.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
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};
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struct rpc_create_args args = {
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.net = net,
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.protocol = XPRT_TRANSPORT_TCP,
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.address = (struct sockaddr *)&sin,
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.addrsize = sizeof(sin),
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.servername = "rpc.statd",
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.nodename = nodename,
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.program = &nsm_program,
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.version = NSM_VERSION,
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.authflavor = RPC_AUTH_NULL,
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.flags = RPC_CLNT_CREATE_NOPING,
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};
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return rpc_create(&args);
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}
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static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
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const struct nlm_host *host)
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{
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int status;
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struct rpc_clnt *clnt;
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struct nsm_args args = {
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.priv = &nsm->sm_priv,
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.prog = NLM_PROGRAM,
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.vers = 3,
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.proc = NLMPROC_NSM_NOTIFY,
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.mon_name = nsm->sm_mon_name,
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.nodename = host->nodename,
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};
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struct rpc_message msg = {
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.rpc_argp = &args,
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.rpc_resp = res,
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};
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memset(res, 0, sizeof(*res));
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clnt = nsm_create(host->net, host->nodename);
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if (IS_ERR(clnt)) {
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dprintk("lockd: failed to create NSM upcall transport, "
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"status=%ld, net=%x\n", PTR_ERR(clnt),
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host->net->ns.inum);
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return PTR_ERR(clnt);
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}
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msg.rpc_proc = &clnt->cl_procinfo[proc];
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status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
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if (status == -ECONNREFUSED) {
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dprintk("lockd: NSM upcall RPC failed, status=%d, forcing rebind\n",
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status);
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rpc_force_rebind(clnt);
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status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
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}
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if (status < 0)
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dprintk("lockd: NSM upcall RPC failed, status=%d\n",
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status);
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else
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status = 0;
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rpc_shutdown_client(clnt);
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return status;
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}
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/**
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* nsm_monitor - Notify a peer in case we reboot
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* @host: pointer to nlm_host of peer to notify
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*
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* If this peer is not already monitored, this function sends an
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* upcall to the local rpc.statd to record the name/address of
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* the peer to notify in case we reboot.
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*
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* Returns zero if the peer is monitored by the local rpc.statd;
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* otherwise a negative errno value is returned.
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*/
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int nsm_monitor(const struct nlm_host *host)
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{
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struct nsm_handle *nsm = host->h_nsmhandle;
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struct nsm_res res;
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int status;
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dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
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if (nsm->sm_monitored)
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return 0;
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/*
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* Choose whether to record the caller_name or IP address of
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* this peer in the local rpc.statd's database.
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*/
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nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
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status = nsm_mon_unmon(nsm, NSMPROC_MON, &res, host);
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if (unlikely(res.status != 0))
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status = -EIO;
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if (unlikely(status < 0)) {
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pr_notice_ratelimited("lockd: cannot monitor %s\n", nsm->sm_name);
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return status;
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}
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nsm->sm_monitored = 1;
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if (unlikely(nsm_local_state != res.state)) {
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nsm_local_state = res.state;
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dprintk("lockd: NSM state changed to %d\n", nsm_local_state);
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}
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return 0;
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}
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/**
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* nsm_unmonitor - Unregister peer notification
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* @host: pointer to nlm_host of peer to stop monitoring
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*
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* If this peer is monitored, this function sends an upcall to
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* tell the local rpc.statd not to send this peer a notification
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* when we reboot.
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*/
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void nsm_unmonitor(const struct nlm_host *host)
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{
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struct nsm_handle *nsm = host->h_nsmhandle;
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struct nsm_res res;
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int status;
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if (refcount_read(&nsm->sm_count) == 1
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&& nsm->sm_monitored && !nsm->sm_sticky) {
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dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
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status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res, host);
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if (res.status != 0)
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status = -EIO;
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if (status < 0)
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printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
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nsm->sm_name);
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else
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nsm->sm_monitored = 0;
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}
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}
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static struct nsm_handle *nsm_lookup_hostname(const struct list_head *nsm_handles,
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const char *hostname, const size_t len)
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{
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struct nsm_handle *nsm;
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list_for_each_entry(nsm, nsm_handles, sm_link)
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if (strlen(nsm->sm_name) == len &&
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memcmp(nsm->sm_name, hostname, len) == 0)
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return nsm;
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return NULL;
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}
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static struct nsm_handle *nsm_lookup_addr(const struct list_head *nsm_handles,
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const struct sockaddr *sap)
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{
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struct nsm_handle *nsm;
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list_for_each_entry(nsm, nsm_handles, sm_link)
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if (rpc_cmp_addr(nsm_addr(nsm), sap))
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return nsm;
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return NULL;
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}
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static struct nsm_handle *nsm_lookup_priv(const struct list_head *nsm_handles,
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const struct nsm_private *priv)
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{
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struct nsm_handle *nsm;
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list_for_each_entry(nsm, nsm_handles, sm_link)
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if (memcmp(nsm->sm_priv.data, priv->data,
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sizeof(priv->data)) == 0)
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return nsm;
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return NULL;
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}
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/*
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* Construct a unique cookie to match this nsm_handle to this monitored
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* host. It is passed to the local rpc.statd via NSMPROC_MON, and
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* returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
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* requests.
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*
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* The NSM protocol requires that these cookies be unique while the
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* system is running. We prefer a stronger requirement of making them
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* unique across reboots. If user space bugs cause a stale cookie to
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* be sent to the kernel, it could cause the wrong host to lose its
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* lock state if cookies were not unique across reboots.
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*
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* The cookies are exposed only to local user space via loopback. They
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* do not appear on the physical network. If we want greater security
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* for some reason, nsm_init_private() could perform a one-way hash to
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* obscure the contents of the cookie.
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*/
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static void nsm_init_private(struct nsm_handle *nsm)
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{
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u64 *p = (u64 *)&nsm->sm_priv.data;
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s64 ns;
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ns = ktime_get_ns();
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put_unaligned(ns, p);
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put_unaligned((unsigned long)nsm, p + 1);
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}
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static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
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const size_t salen,
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const char *hostname,
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const size_t hostname_len)
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{
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struct nsm_handle *new;
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new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
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if (unlikely(new == NULL))
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return NULL;
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refcount_set(&new->sm_count, 1);
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new->sm_name = (char *)(new + 1);
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memcpy(nsm_addr(new), sap, salen);
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new->sm_addrlen = salen;
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nsm_init_private(new);
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if (rpc_ntop(nsm_addr(new), new->sm_addrbuf,
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sizeof(new->sm_addrbuf)) == 0)
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(void)snprintf(new->sm_addrbuf, sizeof(new->sm_addrbuf),
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"unsupported address family");
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memcpy(new->sm_name, hostname, hostname_len);
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new->sm_name[hostname_len] = '\0';
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return new;
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}
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/**
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* nsm_get_handle - Find or create a cached nsm_handle
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* @net: network namespace
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* @sap: pointer to socket address of handle to find
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* @salen: length of socket address
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* @hostname: pointer to C string containing hostname to find
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* @hostname_len: length of C string
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*
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* Behavior is modulated by the global nsm_use_hostnames variable.
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*
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* Returns a cached nsm_handle after bumping its ref count, or
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* returns a fresh nsm_handle if a handle that matches @sap and/or
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* @hostname cannot be found in the handle cache. Returns NULL if
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* an error occurs.
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*/
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struct nsm_handle *nsm_get_handle(const struct net *net,
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const struct sockaddr *sap,
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const size_t salen, const char *hostname,
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const size_t hostname_len)
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{
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struct nsm_handle *cached, *new = NULL;
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struct lockd_net *ln = net_generic(net, lockd_net_id);
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if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
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if (printk_ratelimit()) {
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printk(KERN_WARNING "Invalid hostname \"%.*s\" "
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"in NFS lock request\n",
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(int)hostname_len, hostname);
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}
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return NULL;
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}
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retry:
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spin_lock(&nsm_lock);
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if (nsm_use_hostnames && hostname != NULL)
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cached = nsm_lookup_hostname(&ln->nsm_handles,
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hostname, hostname_len);
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else
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cached = nsm_lookup_addr(&ln->nsm_handles, sap);
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if (cached != NULL) {
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refcount_inc(&cached->sm_count);
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spin_unlock(&nsm_lock);
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kfree(new);
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dprintk("lockd: found nsm_handle for %s (%s), "
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"cnt %d\n", cached->sm_name,
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cached->sm_addrbuf,
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refcount_read(&cached->sm_count));
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return cached;
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}
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if (new != NULL) {
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list_add(&new->sm_link, &ln->nsm_handles);
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spin_unlock(&nsm_lock);
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dprintk("lockd: created nsm_handle for %s (%s)\n",
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new->sm_name, new->sm_addrbuf);
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return new;
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}
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spin_unlock(&nsm_lock);
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new = nsm_create_handle(sap, salen, hostname, hostname_len);
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if (unlikely(new == NULL))
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return NULL;
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goto retry;
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}
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/**
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* nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
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* @net: network namespace
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* @info: pointer to NLMPROC_SM_NOTIFY arguments
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*
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* Returns a matching nsm_handle if found in the nsm cache. The returned
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* nsm_handle's reference count is bumped. Otherwise returns NULL if some
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* error occurred.
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*/
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struct nsm_handle *nsm_reboot_lookup(const struct net *net,
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const struct nlm_reboot *info)
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{
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struct nsm_handle *cached;
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struct lockd_net *ln = net_generic(net, lockd_net_id);
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spin_lock(&nsm_lock);
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cached = nsm_lookup_priv(&ln->nsm_handles, &info->priv);
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if (unlikely(cached == NULL)) {
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spin_unlock(&nsm_lock);
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dprintk("lockd: never saw rebooted peer '%.*s' before\n",
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info->len, info->mon);
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return cached;
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}
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refcount_inc(&cached->sm_count);
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spin_unlock(&nsm_lock);
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dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
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cached->sm_name, cached->sm_addrbuf,
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refcount_read(&cached->sm_count));
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return cached;
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}
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/**
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* nsm_release - Release an NSM handle
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* @nsm: pointer to handle to be released
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*
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*/
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void nsm_release(struct nsm_handle *nsm)
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{
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if (refcount_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
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list_del(&nsm->sm_link);
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spin_unlock(&nsm_lock);
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dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
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nsm->sm_name, nsm->sm_addrbuf);
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kfree(nsm);
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}
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}
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/*
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* XDR functions for NSM.
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*
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* See http://www.opengroup.org/ for details on the Network
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* Status Monitor wire protocol.
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*/
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static void encode_nsm_string(struct xdr_stream *xdr, const char *string)
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{
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const u32 len = strlen(string);
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__be32 *p;
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p = xdr_reserve_space(xdr, 4 + len);
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xdr_encode_opaque(p, string, len);
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}
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/*
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* "mon_name" specifies the host to be monitored.
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*/
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static void encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
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{
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encode_nsm_string(xdr, argp->mon_name);
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}
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/*
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* The "my_id" argument specifies the hostname and RPC procedure
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* to be called when the status manager receives notification
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* (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
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* has changed.
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*/
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static void encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
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{
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__be32 *p;
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encode_nsm_string(xdr, argp->nodename);
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p = xdr_reserve_space(xdr, 4 + 4 + 4);
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*p++ = cpu_to_be32(argp->prog);
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*p++ = cpu_to_be32(argp->vers);
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*p = cpu_to_be32(argp->proc);
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}
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/*
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* The "mon_id" argument specifies the non-private arguments
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* of an NSMPROC_MON or NSMPROC_UNMON call.
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*/
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static void encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
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{
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encode_mon_name(xdr, argp);
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encode_my_id(xdr, argp);
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}
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/*
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* The "priv" argument may contain private information required
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* by the NSMPROC_MON call. This information will be supplied in the
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* NLMPROC_SM_NOTIFY call.
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*/
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static void encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
|
|
xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
|
|
}
|
|
|
|
static void nsm_xdr_enc_mon(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
const void *argp)
|
|
{
|
|
encode_mon_id(xdr, argp);
|
|
encode_priv(xdr, argp);
|
|
}
|
|
|
|
static void nsm_xdr_enc_unmon(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
const void *argp)
|
|
{
|
|
encode_mon_id(xdr, argp);
|
|
}
|
|
|
|
static int nsm_xdr_dec_stat_res(struct rpc_rqst *rqstp,
|
|
struct xdr_stream *xdr,
|
|
void *data)
|
|
{
|
|
struct nsm_res *resp = data;
|
|
__be32 *p;
|
|
|
|
p = xdr_inline_decode(xdr, 4 + 4);
|
|
if (unlikely(p == NULL))
|
|
return -EIO;
|
|
resp->status = be32_to_cpup(p++);
|
|
resp->state = be32_to_cpup(p);
|
|
|
|
dprintk("lockd: %s status %d state %d\n",
|
|
__func__, resp->status, resp->state);
|
|
return 0;
|
|
}
|
|
|
|
static int nsm_xdr_dec_stat(struct rpc_rqst *rqstp,
|
|
struct xdr_stream *xdr,
|
|
void *data)
|
|
{
|
|
struct nsm_res *resp = data;
|
|
__be32 *p;
|
|
|
|
p = xdr_inline_decode(xdr, 4);
|
|
if (unlikely(p == NULL))
|
|
return -EIO;
|
|
resp->state = be32_to_cpup(p);
|
|
|
|
dprintk("lockd: %s state %d\n", __func__, resp->state);
|
|
return 0;
|
|
}
|
|
|
|
#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
|
|
#define SM_my_id_sz (SM_my_name_sz+3)
|
|
#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
|
|
#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
|
|
#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
|
|
#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
|
|
#define SM_monres_sz 2
|
|
#define SM_unmonres_sz 1
|
|
|
|
static const struct rpc_procinfo nsm_procedures[] = {
|
|
[NSMPROC_MON] = {
|
|
.p_proc = NSMPROC_MON,
|
|
.p_encode = nsm_xdr_enc_mon,
|
|
.p_decode = nsm_xdr_dec_stat_res,
|
|
.p_arglen = SM_mon_sz,
|
|
.p_replen = SM_monres_sz,
|
|
.p_statidx = NSMPROC_MON,
|
|
.p_name = "MONITOR",
|
|
},
|
|
[NSMPROC_UNMON] = {
|
|
.p_proc = NSMPROC_UNMON,
|
|
.p_encode = nsm_xdr_enc_unmon,
|
|
.p_decode = nsm_xdr_dec_stat,
|
|
.p_arglen = SM_mon_id_sz,
|
|
.p_replen = SM_unmonres_sz,
|
|
.p_statidx = NSMPROC_UNMON,
|
|
.p_name = "UNMONITOR",
|
|
},
|
|
};
|
|
|
|
static unsigned int nsm_version1_counts[ARRAY_SIZE(nsm_procedures)];
|
|
static const struct rpc_version nsm_version1 = {
|
|
.number = 1,
|
|
.nrprocs = ARRAY_SIZE(nsm_procedures),
|
|
.procs = nsm_procedures,
|
|
.counts = nsm_version1_counts,
|
|
};
|
|
|
|
static const struct rpc_version *nsm_version[] = {
|
|
[1] = &nsm_version1,
|
|
};
|
|
|
|
static struct rpc_stat nsm_stats;
|
|
|
|
static const struct rpc_program nsm_program = {
|
|
.name = "statd",
|
|
.number = NSM_PROGRAM,
|
|
.nrvers = ARRAY_SIZE(nsm_version),
|
|
.version = nsm_version,
|
|
.stats = &nsm_stats
|
|
};
|