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Groups > linux.kernel > #1282580
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.13.y-ckt 23/86] lockd: create NSM handles per net namespace |
| Date | 2015-12-03 00:30 +0100 |
| Message-ID | <qBp0v-5qO-47@gated-at.bofh.it> (permalink) |
| References | <qBoxr-50H-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.13.11-ckt31 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Andrey Ryabinin <aryabinin@virtuozzo.com>
commit 0ad95472bf169a3501991f8f33f5147f792a8116 upstream.
Commit cb7323fffa85 ("lockd: create and use per-net NSM
RPC clients on MON/UNMON requests") introduced per-net
NSM RPC clients. Unfortunately this doesn't make any sense
without per-net nsm_handle.
E.g. the following scenario could happen
Two hosts (X and Y) in different namespaces (A and B) share
the same nsm struct.
1. nsm_monitor(host_X) called => NSM rpc client created,
nsm->sm_monitored bit set.
2. nsm_mointor(host-Y) called => nsm->sm_monitored already set,
we just exit. Thus in namespace B ln->nsm_clnt == NULL.
3. host X destroyed => nsm->sm_count decremented to 1
4. host Y destroyed => nsm_unmonitor() => nsm_mon_unmon() => NULL-ptr
dereference of *ln->nsm_clnt
So this could be fixed by making per-net nsm_handles list,
instead of global. Thus different net namespaces will not be able
share the same nsm_handle.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
fs/lockd/host.c | 7 ++++---
fs/lockd/mon.c | 36 ++++++++++++++++++++++--------------
fs/lockd/netns.h | 1 +
fs/lockd/svc.c | 1 +
fs/lockd/svc4proc.c | 2 +-
fs/lockd/svcproc.c | 2 +-
include/linux/lockd/lockd.h | 9 ++++++---
7 files changed, 36 insertions(+), 22 deletions(-)
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 969d589..b5f3c3a 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -116,7 +116,7 @@ static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni,
atomic_inc(&nsm->sm_count);
else {
host = NULL;
- nsm = nsm_get_handle(ni->sap, ni->salen,
+ nsm = nsm_get_handle(ni->net, ni->sap, ni->salen,
ni->hostname, ni->hostname_len);
if (unlikely(nsm == NULL)) {
dprintk("lockd: %s failed; no nsm handle\n",
@@ -534,17 +534,18 @@ static struct nlm_host *next_host_state(struct hlist_head *cache,
/**
* nlm_host_rebooted - Release all resources held by rebooted host
+ * @net: network namespace
* @info: pointer to decoded results of NLM_SM_NOTIFY call
*
* We were notified that the specified host has rebooted. Release
* all resources held by that peer.
*/
-void nlm_host_rebooted(const struct nlm_reboot *info)
+void nlm_host_rebooted(const struct net *net, const struct nlm_reboot *info)
{
struct nsm_handle *nsm;
struct nlm_host *host;
- nsm = nsm_reboot_lookup(info);
+ nsm = nsm_reboot_lookup(net, info);
if (unlikely(nsm == NULL))
return;
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 6ae664b..13fac49 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -51,7 +51,6 @@ struct nsm_res {
};
static const struct rpc_program nsm_program;
-static LIST_HEAD(nsm_handles);
static DEFINE_SPINLOCK(nsm_lock);
/*
@@ -259,33 +258,35 @@ void nsm_unmonitor(const struct nlm_host *host)
}
}
-static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
- const size_t len)
+static struct nsm_handle *nsm_lookup_hostname(const struct list_head *nsm_handles,
+ const char *hostname, const size_t len)
{
struct nsm_handle *nsm;
- list_for_each_entry(nsm, &nsm_handles, sm_link)
+ list_for_each_entry(nsm, nsm_handles, sm_link)
if (strlen(nsm->sm_name) == len &&
memcmp(nsm->sm_name, hostname, len) == 0)
return nsm;
return NULL;
}
-static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
+static struct nsm_handle *nsm_lookup_addr(const struct list_head *nsm_handles,
+ const struct sockaddr *sap)
{
struct nsm_handle *nsm;
- list_for_each_entry(nsm, &nsm_handles, sm_link)
+ list_for_each_entry(nsm, nsm_handles, sm_link)
if (rpc_cmp_addr(nsm_addr(nsm), sap))
return nsm;
return NULL;
}
-static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
+static struct nsm_handle *nsm_lookup_priv(const struct list_head *nsm_handles,
+ const struct nsm_private *priv)
{
struct nsm_handle *nsm;
- list_for_each_entry(nsm, &nsm_handles, sm_link)
+ list_for_each_entry(nsm, nsm_handles, sm_link)
if (memcmp(nsm->sm_priv.data, priv->data,
sizeof(priv->data)) == 0)
return nsm;
@@ -350,6 +351,7 @@ static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
/**
* nsm_get_handle - Find or create a cached nsm_handle
+ * @net: network namespace
* @sap: pointer to socket address of handle to find
* @salen: length of socket address
* @hostname: pointer to C string containing hostname to find
@@ -362,11 +364,13 @@ static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
* @hostname cannot be found in the handle cache. Returns NULL if
* an error occurs.
*/
-struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
+struct nsm_handle *nsm_get_handle(const struct net *net,
+ const struct sockaddr *sap,
const size_t salen, const char *hostname,
const size_t hostname_len)
{
struct nsm_handle *cached, *new = NULL;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
if (printk_ratelimit()) {
@@ -381,9 +385,10 @@ retry:
spin_lock(&nsm_lock);
if (nsm_use_hostnames && hostname != NULL)
- cached = nsm_lookup_hostname(hostname, hostname_len);
+ cached = nsm_lookup_hostname(&ln->nsm_handles,
+ hostname, hostname_len);
else
- cached = nsm_lookup_addr(sap);
+ cached = nsm_lookup_addr(&ln->nsm_handles, sap);
if (cached != NULL) {
atomic_inc(&cached->sm_count);
@@ -397,7 +402,7 @@ retry:
}
if (new != NULL) {
- list_add(&new->sm_link, &nsm_handles);
+ list_add(&new->sm_link, &ln->nsm_handles);
spin_unlock(&nsm_lock);
dprintk("lockd: created nsm_handle for %s (%s)\n",
new->sm_name, new->sm_addrbuf);
@@ -414,19 +419,22 @@ retry:
/**
* nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
+ * @net: network namespace
* @info: pointer to NLMPROC_SM_NOTIFY arguments
*
* Returns a matching nsm_handle if found in the nsm cache. The returned
* nsm_handle's reference count is bumped. Otherwise returns NULL if some
* error occurred.
*/
-struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
+struct nsm_handle *nsm_reboot_lookup(const struct net *net,
+ const struct nlm_reboot *info)
{
struct nsm_handle *cached;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
spin_lock(&nsm_lock);
- cached = nsm_lookup_priv(&info->priv);
+ cached = nsm_lookup_priv(&ln->nsm_handles, &info->priv);
if (unlikely(cached == NULL)) {
spin_unlock(&nsm_lock);
dprintk("lockd: never saw rebooted peer '%.*s' before\n",
diff --git a/fs/lockd/netns.h b/fs/lockd/netns.h
index 5010b55..414da99 100644
--- a/fs/lockd/netns.h
+++ b/fs/lockd/netns.h
@@ -16,6 +16,7 @@ struct lockd_net {
spinlock_t nsm_clnt_lock;
unsigned int nsm_users;
struct rpc_clnt *nsm_clnt;
+ struct list_head nsm_handles;
};
extern int lockd_net_id;
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 59a53f6..bb1ad4d 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -583,6 +583,7 @@ static int lockd_init_net(struct net *net)
INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
INIT_LIST_HEAD(&ln->grace_list);
spin_lock_init(&ln->nsm_clnt_lock);
+ INIT_LIST_HEAD(&ln->nsm_handles);
return 0;
}
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index b147d1a..09c576f 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -421,7 +421,7 @@ nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
return rpc_system_err;
}
- nlm_host_rebooted(argp);
+ nlm_host_rebooted(SVC_NET(rqstp), argp);
return rpc_success;
}
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
index 21171f0..fb26b9f 100644
--- a/fs/lockd/svcproc.c
+++ b/fs/lockd/svcproc.c
@@ -464,7 +464,7 @@ nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
return rpc_system_err;
}
- nlm_host_rebooted(argp);
+ nlm_host_rebooted(SVC_NET(rqstp), argp);
return rpc_success;
}
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index dcaad79..0adf073 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -236,7 +236,8 @@ void nlm_rebind_host(struct nlm_host *);
struct nlm_host * nlm_get_host(struct nlm_host *);
void nlm_shutdown_hosts(void);
void nlm_shutdown_hosts_net(struct net *net);
-void nlm_host_rebooted(const struct nlm_reboot *);
+void nlm_host_rebooted(const struct net *net,
+ const struct nlm_reboot *);
/*
* Host monitoring
@@ -244,11 +245,13 @@ void nlm_host_rebooted(const struct nlm_reboot *);
int nsm_monitor(const struct nlm_host *host);
void nsm_unmonitor(const struct nlm_host *host);
-struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
+struct nsm_handle *nsm_get_handle(const struct net *net,
+ const struct sockaddr *sap,
const size_t salen,
const char *hostname,
const size_t hostname_len);
-struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info);
+struct nsm_handle *nsm_reboot_lookup(const struct net *net,
+ const struct nlm_reboot *info);
void nsm_release(struct nsm_handle *nsm);
/*
--
1.9.1
--
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2015-12-03 00:20 +0100 [PATCH 3.13.y-ckt 51/86] KVM: Disable SMAP for guests in EPT realmode and EPT unpaging mode Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:20 +0100 [PATCH 3.13.y-ckt 52/86] KVM: VMX: fix SMEP and SMAP without EPT Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:20 +0100 [PATCH 3.13.y-ckt 13/86] net: fix a race in dst_release() Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:20 +0100 [PATCH 3.13.y-ckt 06/86] irda: precedence bug in irlmp_seq_hb_idx() Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 08/86] RDS-TCP: Recover correctly from pskb_pull()/pksb_trim() failure in rds_tcp_data_recv Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 16/86] [media] v4l2-compat-ioctl32: fix alignment for ARM64 Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 33/86] Bluetooth: ath3k: Add new AR3012 0930:021c id Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 02/86] x86/setup: Fix low identity map for >= 2GB kernel range Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 20/86] ARM: 8426/1: dma-mapping: add missing range check in dma_mmap() Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 29/86] ext4, jbd2: ensure entering into panic after recording an error in superblock Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 25/86] iommu/vt-d: Fix error in detect ATS capability Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 05/86] drm/radeon: fix quirk for MSI R7 370 Armor 2X Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 22/86] spi: ti-qspi: Fix data corruption seen on r/w stress test Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 28/86] [PATCH] fix calculation of meta_bg descriptor backups Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 10/86] ipmr: fix possible race resulting from improper usage of IP_INC_STATS_BH() in preemptible context. Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 23/86] lockd: create NSM handles per net namespace Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 07/86] macvtap: unbreak receiving of gro skb with frag list Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 15/86] HID: core: Avoid uninitialized buffer access Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 01/86] x86/setup: Extend low identity map to cover whole kernel range Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 03/86] drm/radeon: add quirk for MSI R7 370 Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 09/86] stmmac: Correctly report PTP capabilities. Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 24/86] ARM: common: edma: Fix channel parameter for irq callbacks Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 21/86] ARM: 8427/1: dma-mapping: add support for offset parameter in dma_mmap() Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 26/86] iommu/vt-d: Fix ATSR handling for Root-Complex integrated endpoints Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 27/86] ext4: fix potential use after free in __ext4_journal_stop Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100 [PATCH 3.13.y-ckt 30/86] vTPM: fix memory allocation flag for rtce buffer at kernel boot Kamal Mostafa <kamal@canonical.com> - 2015-12-03 00:30 +0100
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