On Tue, Feb 18, 2014 at 07:19:31PM +0400, Stanislav Kinsbursky wrote:
> 18.02.2014 02:19, J. Bruce Fields пишет:
> >On Sat, Feb 15, 2014 at 09:51:20AM +0800, Weng Meiling wrote:
> >>Hi Bruce,
> >>
> >>The upstream has merged your git tree for-3.14, but there is no this patch?
> >>Do you forget this patch?
> >
> >Apologies, I'm not sure what happened.
> >
> >Looking back at it.... The patch causes all my pynfs reboot recovery
> >tests to fail. They're just doing a "systemctl restart
> >nfs-server.service", and "systemctl status nfs-server.service" shows in
> >part
> >
> > ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS $RPCNFSDCOUNT (code=exited, status=1/FAILURE)
> >
> >So the patch is causing rpc.nfsd to fail? No network namespaces should
> >be involved.
> >
> >I haven't investigated any further.
> >
>
> Hi Bruce,
> Are you sure, that exactly this patch broke your pynfs tests?
> BTW, systemd manipulates namespaces. Maybe the patch revealed some pynfs internal bugs?
> What do you think?
It's really just "systemctl restart nfs-server.service" that the patch
breaks, pynfs isn't involved much.
The patch I'm actually using follows, but I believe the only difference
is in the printk message?
--b
commit e1f2922c12cb59baba0f2c7726bee992a0861310
Author: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
Date: Mon Dec 30 17:23:59 2013 +0300
nfsd: check passed socket's net matches the NFSd superblock's
The file descriptor written to the nfsd/portlist file could be for a
socket in a different network namespace from the network namespace that
the nfsd filesystem was mounted in, and this can cause a crash.
For example: "ip netns exec" creates a new network and mount namespace,
which duplicates the nfsd mount point which was created in the init_net
context. Thus NFS server stop in the nested network context leads to
RPCBIND client destruction in init_net. Then, on nfsd start in the
nested network context, the rpc.nfsd process creates a socket in the
nested net and passes it into "write_ports", which leads to RPCBIND
socket creation in init_net context for the same reason (the nfsd mount
point was created in the init_net context). An attempt to register
passed socket in nested net leads to panic, because no RPCBIND client is
present in the nested network namespace.
This patch adds a check that the passed the socket's net matches the
nfsd superblock's net, and returns -EINVAL error to user space if not.
Reported-by: Weng Meiling <wengmeiling.weng@xxxxxxxxxx>
Signed-off-by: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7f55517..1331766 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -699,6 +699,11 @@ static ssize_t __write_ports_addfd(char *buf, struct net *net)
if (err != 0 || fd < 0)
return -EINVAL;
+ if (svc_alien_sock(net, fd)) {
+ printk(KERN_ERR "%s: socket net is different from NFSd's\n", __func__);
+ return -EINVAL;
+ }
+
err = nfsd_create_serv(net);
if (err != 0)
return err;
diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h
index 62fd1b7..947009e 100644
--- a/include/linux/sunrpc/svcsock.h
+++ b/include/linux/sunrpc/svcsock.h
@@ -56,6 +56,7 @@ int svc_recv(struct svc_rqst *, long);
int svc_send(struct svc_rqst *);
void svc_drop(struct svc_rqst *);
void svc_sock_update_bufs(struct svc_serv *serv);
+bool svc_alien_sock(struct net *net, int fd);
int svc_addsock(struct svc_serv *serv, const int fd,
char *name_return, const size_t len);
void svc_init_xprt_sock(void);
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index b6e59f0..3ba5b87 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1397,6 +1397,17 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
return svsk;
}
+bool svc_alien_sock(struct net *net, int fd)
+{
+ int err;
+ struct socket *sock = sockfd_lookup(fd, &err);
+
+ if (sock && (sock_net(sock->sk) != net))
+ return true;
+ return false;
+}
+EXPORT_SYMBOL_GPL(svc_alien_sock);
+
/**
* svc_addsock - add a listener socket to an RPC service
* @serv: pointer to RPC service to which to add a new listener
--
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