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| author |   Andrey Ryabinin <aryabinin@virtuozzo.com> | 2015-09-23 15:49:29 +0300 |
|---|---|---|
| committer |   J. Bruce Fields <bfields@redhat.com> | 2015-10-12 17:31:05 -0400 |
| commit | 0ad95472bf169a3501991f8f33f5147f792a8116 (patch) | |
| tree | 3c2303ba0350c2dcd54db07c9883954ed9092c49 /include/linux/lockd | |
| parent | nfsd: switch unsigned char flags in svc_fh to bools (diff) | |
| download | wireguard-linux-0ad95472bf169a3501991f8f33f5147f792a8116.tar.xz wireguard-linux-0ad95472bf169a3501991f8f33f5147f792a8116.zip | |
lockd: create NSM handles per net namespace
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>
Cc: <stable@vger.kernel.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'include/linux/lockd')
| -rw-r--r-- | include/linux/lockd/lockd.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index ff82a32871b5..fd3b65bf51b5 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -235,7 +235,8 @@ 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 @@ -243,11 +244,13 @@ 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); /* |