[PATCH 09/14] NFS: Introduce lifecycle management for label attribute.

From: David P. Quigley
Date: Mon Sep 15 2008 - 17:10:41 EST

Two fields have been added to the nfs_fattr structure to carry the security
label and its length. This has raised the need to provide lifecycle management
for these values. This patch introduces two macros nfs_fattr_alloc and
nfs_fattr_fini which are used to allocate and destroy these fields inside the
nfs_fattr structure. These macros do not modify any other components of the
structure so nfs_fattr_init still has to be used on these structures. In the
event that CONFIG_SECURITY is not set these calls should compile away.

Signed-off-by: Matthew N. Dodd <Matthew.Dodd@xxxxxxxxxx>
Signed-off-by: David P. Quigley <dpquigl@xxxxxxxxxxxxx>
---
fs/nfs/client.c | 18 +++++++++-
fs/nfs/dir.c | 24 +++++++++++++
fs/nfs/getroot.c | 35 ++++++++++++++++++-
fs/nfs/inode.c | 16 +++++++++
fs/nfs/namespace.c | 3 ++
fs/nfs/nfs3proc.c | 7 ++++
fs/nfs/nfs4proc.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++-
fs/nfs/proc.c | 12 ++++++-
fs/nfs/super.c | 4 ++
include/linux/nfs_fs.h | 46 +++++++++++++++++++++++++
10 files changed, 248 insertions(+), 5 deletions(-)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 5ee23e7..756d554 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -902,6 +902,8 @@ struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
struct nfs_fattr fattr;
int error;

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
server = nfs_alloc_server();
if (!server)
return ERR_PTR(-ENOMEM);
@@ -952,10 +954,12 @@ struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
spin_unlock(&nfs_client_lock);

server->mount_time = jiffies;
+ nfs_fattr_fini(&fattr);
return server;

error:
nfs_free_server(server);
+ nfs_fattr_fini(&fattr);
return ERR_PTR(error);
}

@@ -1073,7 +1077,7 @@ static int nfs4_init_server(struct nfs_server *server,
goto error;

/* Initialise the client representation from the mount data */
- server->flags = data->flags & NFS_MOUNT_FLAGMASK;
+ server->flags = data->flags & NFS4_MOUNT_FLAGMASK;
server->caps |= NFS_CAP_ATOMIC_OPEN;

if (data->rsize)
@@ -1109,6 +1113,8 @@ struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,

dprintk("--> nfs4_create_server()\n");

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
server = nfs_alloc_server();
if (!server)
return ERR_PTR(-ENOMEM);
@@ -1149,11 +1155,13 @@ struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
spin_unlock(&nfs_client_lock);

server->mount_time = jiffies;
+ nfs_fattr_fini(&fattr);
dprintk("<-- nfs4_create_server() = %p\n", server);
return server;

error:
nfs_free_server(server);
+ nfs_fattr_fini(&fattr);
dprintk("<-- nfs4_create_server() = error %d\n", error);
return ERR_PTR(error);
}
@@ -1171,6 +1179,8 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,

dprintk("--> nfs4_create_referral_server()\n");

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
server = nfs_alloc_server();
if (!server)
return ERR_PTR(-ENOMEM);
@@ -1227,10 +1237,12 @@ struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
server->mount_time = jiffies;

dprintk("<-- nfs_create_referral_server() = %p\n", server);
+ nfs_fattr_fini(&fattr);
return server;

error:
nfs_free_server(server);
+ nfs_fattr_fini(&fattr);
dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
return ERR_PTR(error);
}
@@ -1252,6 +1264,8 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source,
(unsigned long long) fattr->fsid.major,
(unsigned long long) fattr->fsid.minor);

+ memset(&fattr_fsinfo, 0, sizeof(struct nfs_fattr));
+
server = nfs_alloc_server();
if (!server)
return ERR_PTR(-ENOMEM);
@@ -1294,11 +1308,13 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source,

server->mount_time = jiffies;

+ nfs_fattr_fini(&fattr_fsinfo);
dprintk("<-- nfs_clone_server() = %p\n", server);
return server;

out_free_server:
nfs_free_server(server);
+ nfs_fattr_fini(&fattr_fsinfo);
dprintk("<-- nfs_clone_server() = error %d\n", error);
return ERR_PTR(error);
}
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 74f92b7..db43b69 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -551,6 +551,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
my_entry.eof = 0;
my_entry.fh = &fh;
my_entry.fattr = &fattr;
+ memset(&fattr, 0, sizeof(struct nfs_fattr));
nfs_fattr_init(&fattr);
desc->entry = &my_entry;

@@ -588,6 +589,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
res = 0;
break;
}
+ nfs_fattr_fini(&fattr);
}
out:
nfs_unblock_sillyrename(dentry);
@@ -773,6 +775,8 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
struct nfs_fh fhandle;
struct nfs_fattr fattr;

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
parent = dget_parent(dentry);
dir = parent->d_inode;
nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
@@ -801,6 +805,11 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
if (NFS_STALE(inode))
goto out_bad;

+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL))
+ nfs_fattr_alloc(&fattr, GFP_NOWAIT);
+#endif
+
error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
if (error)
goto out_bad;
@@ -812,6 +821,7 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
out_valid:
dput(parent);
+ nfs_fattr_fini(&fattr);
dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n",
__func__, dentry->d_parent->d_name.name,
dentry->d_name.name);
@@ -830,6 +840,7 @@ out_zap_parent:
}
d_drop(dentry);
dput(parent);
+ nfs_fattr_fini(&fattr);
dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n",
__func__, dentry->d_parent->d_name.name,
dentry->d_name.name);
@@ -906,6 +917,8 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru
dentry->d_parent->d_name.name, dentry->d_name.name);
nfs_inc_stats(dir, NFSIOS_VFSLOOKUP);

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
res = ERR_PTR(-ENAMETOOLONG);
if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
goto out;
@@ -923,6 +936,11 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru
goto out;
}

+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL))
+ nfs_fattr_alloc(&fattr, GFP_NOWAIT);
+#endif
+
parent = dentry->d_parent;
/* Protect against concurrent sillydeletes */
nfs_block_sillyrename(parent);
@@ -949,6 +967,8 @@ no_entry:
out_unblock_sillyrename:
nfs_unblock_sillyrename(parent);
out:
+ /* Label will give 'unused' warning on 'no_entry' case. */
+ nfs_fattr_fini(&fattr);
return res;
}

@@ -1214,6 +1234,7 @@ static int nfs_create(struct inode *dir, struct dentry *dentry, int mode,
dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);

+ memset(&attr, 0, sizeof(struct iattr));
attr.ia_mode = mode;
attr.ia_valid = ATTR_MODE;

@@ -1244,6 +1265,7 @@ nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
if (!new_valid_dev(rdev))
return -EINVAL;

+ memset(&attr, 0, sizeof(struct iattr));
attr.ia_mode = mode;
attr.ia_valid = ATTR_MODE;

@@ -1267,6 +1289,7 @@ static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n",
dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);

+ memset(&attr, 0, sizeof(struct iattr));
attr.ia_valid = ATTR_MODE;
attr.ia_mode = mode | S_IFDIR;

@@ -1476,6 +1499,7 @@ static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *sym
if (pathlen > PAGE_SIZE)
return -ENAMETOOLONG;

+ memset(&attr, 0, sizeof(struct iattr));
attr.ia_mode = S_IFLNK | S_IRWXUGO;
attr.ia_valid = ATTR_MODE;

diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index fae9719..bc23077 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -31,7 +31,6 @@
#include <linux/vfs.h>
#include <linux/namei.h>
#include <linux/mnt_namespace.h>
-#include <linux/security.h>

#include <asm/system.h>
#include <asm/uaccess.h>
@@ -84,6 +83,8 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh)
struct inode *inode;
int error;

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
/* get the actual root for this mount */
fsinfo.fattr = &fattr;

@@ -119,6 +120,7 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh)
if (!mntroot->d_op)
mntroot->d_op = server->nfs_client->rpc_ops->dentry_ops;

+ nfs_fattr_fini(&fattr);
return mntroot;
}

@@ -143,6 +145,12 @@ int nfs4_path_walk(struct nfs_server *server,

dprintk("--> nfs4_path_walk(,,%s)\n", path);

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ /* Unconditional, no server caps yet. */
+ nfs_fattr_alloc(&fattr, GFP_KERNEL);
+#endif
+
fsinfo.fattr = &fattr;
nfs_fattr_init(&fattr);

@@ -154,12 +162,14 @@ int nfs4_path_walk(struct nfs_server *server,
ret = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo);
if (ret < 0) {
dprintk("nfs4_get_root: getroot error = %d\n", -ret);
+ nfs_fattr_fini(&fattr);
return ret;
}

if (fattr.type != NFDIR) {
printk(KERN_ERR "nfs4_get_root:"
" getroot encountered non-directory\n");
+ nfs_fattr_fini(&fattr);
return -ENOTDIR;
}

@@ -167,6 +177,7 @@ int nfs4_path_walk(struct nfs_server *server,
if (fattr.valid & NFS_ATTR_FATTR_V4_REFERRAL) {
printk(KERN_ERR "nfs4_get_root:"
" getroot obtained referral\n");
+ nfs_fattr_fini(&fattr);
return -EREMOTE;
}

@@ -199,6 +210,7 @@ eat_dot_dir:
) {
printk(KERN_ERR "nfs4_get_root:"
" Mount path contains reference to \"..\"\n");
+ nfs_fattr_fini(&fattr);
return -EINVAL;
}

@@ -207,16 +219,25 @@ eat_dot_dir:

dprintk("LookupFH: %*.*s [%s]\n", name.len, name.len, name.name, path);

+ nfs_fattr_fini(&fattr);
+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL)
+ nfs_fattr_alloc(&fattr, GFP_KERNEL);
+#endif
+
ret = server->nfs_client->rpc_ops->lookupfh(server, &lastfh, &name,
mntfh, &fattr);
if (ret < 0) {
dprintk("nfs4_get_root: getroot error = %d\n", -ret);
+ nfs_fattr_fini(&fattr);
return ret;
}

if (fattr.type != NFDIR) {
printk(KERN_ERR "nfs4_get_root:"
" lookupfh encountered non-directory\n");
+ nfs_fattr_fini(&fattr);
return -ENOTDIR;
}

@@ -224,6 +245,7 @@ eat_dot_dir:
if (fattr.valid & NFS_ATTR_FATTR_V4_REFERRAL) {
printk(KERN_ERR "nfs4_get_root:"
" lookupfh obtained referral\n");
+ nfs_fattr_fini(&fattr);
return -EREMOTE;
}

@@ -231,6 +253,7 @@ eat_dot_dir:

path_walk_complete:
memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
+ nfs_fattr_fini(&fattr);
dprintk("<-- nfs4_path_walk() = 0\n");
return 0;
}
@@ -256,19 +279,29 @@ struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
return ERR_PTR(error);
}

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL)
+ nfs_fattr_alloc(&fattr, GFP_KERNEL);
+#endif
+
/* get the actual root for this mount */
error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
if (error < 0) {
+ nfs_fattr_fini(&fattr);
dprintk("nfs_get_root: getattr error = %d\n", -error);
return ERR_PTR(error);
}

inode = nfs_fhget(sb, mntfh, &fattr);
if (IS_ERR(inode)) {
+ nfs_fattr_fini(&fattr);
dprintk("nfs_get_root: get root inode failed\n");
return ERR_CAST(inode);
}

+ nfs_fattr_fini(&fattr);
+
error = nfs_superblock_set_dummy_root(sb, inode);
if (error != 0)
return ERR_PTR(error);
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 52daefa..40d7142 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -360,6 +360,12 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
attr->ia_valid &= ~ATTR_MODE;

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
+ nfs_fattr_alloc(&fattr, GFP_KERNEL);
+#endif
+
if (attr->ia_valid & ATTR_SIZE) {
if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
attr->ia_valid &= ~ATTR_SIZE;
@@ -383,6 +389,7 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
if (error == 0)
nfs_refresh_inode(inode, &fattr);
+ nfs_fattr_fini(&fattr);
return error;
}

@@ -698,6 +705,9 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
inode->i_sb->s_id, (long long)NFS_FILEID(inode));

nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
+
+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
if (is_bad_inode(inode))
goto out_nowait;
if (NFS_STALE(inode))
@@ -711,6 +721,11 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
if (NFS_STALE(inode))
goto out;

+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
+ nfs_fattr_alloc(&fattr, GFP_KERNEL);
+#endif
+
status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
if (status != 0) {
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
@@ -746,6 +761,7 @@ __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
nfs_wake_up_inode(inode);

out_nowait:
+ nfs_fattr_fini(&fattr);
return status;
}

diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 66df08d..a20b428 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -105,6 +105,8 @@ static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)

dprintk("--> nfs_follow_mountpoint()\n");

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
BUG_ON(IS_ROOT(dentry));
dprintk("%s: enter\n", __func__);
dput(nd->path.dentry);
@@ -142,6 +144,7 @@ static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
nd->path.dentry = dget(mnt->mnt_root);
schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
out:
+ nfs_fattr_fini(&fattr);
dprintk("%s: done, returned %d\n", __func__, err);

dprintk("<-- nfs_follow_mountpoint() = %d\n", err);
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 1e750e4..c49a2aa 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -294,6 +294,9 @@ static int nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_

static void nfs3_free_createdata(struct nfs3_createdata *data)
{
+
+ nfs_fattr_fini(data->res.fattr);
+ nfs_fattr_fini(data->res.dir_attr);
kfree(data);
}

@@ -420,6 +423,7 @@ nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
return 0;
res = task->tk_msg.rpc_resp;
nfs_post_op_update_inode(dir, &res->dir_attr);
+ nfs_fattr_fini(&res->dir_attr);
return 1;
}

@@ -618,6 +622,9 @@ nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
dprintk("NFS call readdir%s %d\n",
plus? "plus" : "", (unsigned int) cookie);

+
+ memset(&dir_attr, 0, sizeof(struct nfs_fattr));
+
nfs_fattr_init(&dir_attr);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c910413..c4a4271 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -243,6 +243,8 @@ static void nfs4_init_opendata_res(struct nfs4_opendata *p)
p->o_res.seqid = p->o_arg.seqid;
p->c_res.seqid = p->c_arg.seqid;
p->o_res.server = p->o_arg.server;
+ memset(&p->f_attr, 0, sizeof(struct nfs_fattr));
+ memset(&p->dir_attr, 0, sizeof(struct nfs_fattr));
nfs_fattr_init(&p->f_attr);
nfs_fattr_init(&p->dir_attr);
}
@@ -288,6 +290,13 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
p->c_arg.seqid = p->o_arg.seqid;
nfs4_init_opendata_res(p);
kref_init(&p->kref);
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL) {
+ nfs_fattr_alloc(&p->f_attr, GFP_KERNEL);
+ nfs_fattr_alloc(&p->dir_attr, GFP_KERNEL);
+ }
+#endif
+
return p;
err_free:
kfree(p);
@@ -304,6 +313,8 @@ static void nfs4_opendata_free(struct kref *kref)
nfs_free_seqid(p->o_arg.seqid);
if (p->state != NULL)
nfs4_put_open_state(p->state);
+ nfs_fattr_fini(&p->f_attr);
+ nfs_fattr_fini(&p->dir_attr);
nfs4_put_state_owner(p->owner);
dput(p->dir);
path_put(&p->path);
@@ -1210,6 +1221,7 @@ static void nfs4_free_closedata(void *data)
nfs_free_seqid(calldata->arg.seqid);
nfs4_put_state_owner(sp);
path_put(&calldata->path);
+ nfs_fattr_fini(&calldata->fattr);
kfree(calldata);
}

@@ -1317,7 +1329,7 @@ int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
};
int status = -ENOMEM;

- calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
+ calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
if (calldata == NULL)
goto out;
calldata->inode = state->inode;
@@ -1335,6 +1347,10 @@ int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
calldata->path.mnt = mntget(path->mnt);
calldata->path.dentry = dget(path->dentry);

+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL)
+ nfs_fattr_alloc(&calldata->fattr, GFP_KERNEL);
+#endif
msg.rpc_argp = &calldata->arg,
msg.rpc_resp = &calldata->res,
task_setup_data.callback_data = calldata;
@@ -1347,6 +1363,7 @@ int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
rpc_put_task(task);
return status;
out_free_calldata:
+ nfs_fattr_fini(&calldata->fattr);
kfree(calldata);
out:
nfs4_put_open_state(state);
@@ -1762,6 +1779,8 @@ static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry
int mode = entry->mask;
int status;

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
/*
* Determine which access bits we want to ask for...
*/
@@ -1778,6 +1797,10 @@ static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry
if (mode & MAY_EXEC)
args.access |= NFS4_ACCESS_EXECUTE;
}
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL)
+ nfs_fattr_alloc(&fattr, GFP_KERNEL);
+#endif
nfs_fattr_init(&fattr);
status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
if (!status) {
@@ -1790,6 +1813,7 @@ static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry
entry->mask |= MAY_EXEC;
nfs_refresh_inode(inode, &fattr);
}
+ nfs_fattr_fini(&fattr);
return status;
}

@@ -1902,10 +1926,16 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
if (flags & O_EXCL) {
struct nfs_fattr fattr;
+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (nfs_server_capable(state->inode, NFS_CAP_SECURITY_LABEL))
+ nfs_fattr_alloc(&fattr, GFP_KERNEL);
+#endif
status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
if (status == 0)
nfs_setattr_update_inode(state->inode, sattr);
nfs_post_op_update_inode(state->inode, &fattr);
+ nfs_fattr_fini(&fattr);
}
if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
status = nfs4_intent_set_file(nd, &path, state);
@@ -1936,12 +1966,18 @@ static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
};
int status;

+ memset(&res.dir_attr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL)
+ nfs_fattr_alloc(&res.dir_attr, GFP_KERNEL);
+#endif
nfs_fattr_init(&res.dir_attr);
status = rpc_call_sync(server->client, &msg, 0);
if (status == 0) {
update_changeattr(dir, &res.cinfo);
nfs_post_op_update_inode(dir, &res.dir_attr);
}
+ nfs_fattr_fini(&res.dir_attr);
return status;
}

@@ -1966,6 +2002,13 @@ static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
args->bitmask = server->attr_bitmask;
res->server = server;
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
+
+ memset(&res->dir_attr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL)
+ nfs_fattr_alloc(&res->dir_attr, GFP_KERNEL);
+#endif
+ nfs_fattr_init(&res->dir_attr);
}

static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
@@ -1976,6 +2019,7 @@ static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
return 0;
update_changeattr(dir, &res->cinfo);
nfs_post_op_update_inode(dir, &res->dir_attr);
+ nfs_fattr_fini(&res->dir_attr);
return 1;
}

@@ -2003,6 +2047,15 @@ static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
};
int status;

+ memset(&old_fattr, 0, sizeof(struct nfs_fattr));
+ memset(&new_fattr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL) {
+ nfs_fattr_alloc(&old_fattr, GFP_KERNEL);
+ nfs_fattr_alloc(&new_fattr, GFP_KERNEL);
+ }
+#endif
+
nfs_fattr_init(res.old_fattr);
nfs_fattr_init(res.new_fattr);
status = rpc_call_sync(server->client, &msg, 0);
@@ -2013,6 +2066,8 @@ static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
update_changeattr(new_dir, &res.new_cinfo);
nfs_post_op_update_inode(new_dir, res.new_fattr);
}
+ nfs_fattr_fini(&old_fattr);
+ nfs_fattr_fini(&new_fattr);
return status;
}

@@ -2052,6 +2107,15 @@ static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *
};
int status;

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+ memset(&dir_attr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL) {
+ nfs_fattr_alloc(&fattr, GFP_KERNEL);
+ nfs_fattr_alloc(&dir_attr, GFP_KERNEL);
+ }
+#endif
+
nfs_fattr_init(res.fattr);
nfs_fattr_init(res.dir_attr);
status = rpc_call_sync(server->client, &msg, 0);
@@ -2061,6 +2125,8 @@ static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *
nfs_post_op_update_inode(inode, res.fattr);
}

+ nfs_fattr_fini(&fattr);
+ nfs_fattr_fini(&dir_attr);
return status;
}

@@ -2107,6 +2173,14 @@ static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
data->res.fh = &data->fh;
data->res.fattr = &data->fattr;
data->res.dir_fattr = &data->dir_fattr;
+ memset(&data->fattr, 0, sizeof(struct nfs_fattr));
+ memset(&data->dir_fattr, 0, sizeof(struct nfs_fattr));
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL) {
+ nfs_fattr_alloc(&data->fattr, GFP_KERNEL);
+ nfs_fattr_alloc(&data->dir_fattr, GFP_KERNEL);
+ }
+#endif
nfs_fattr_init(data->res.fattr);
nfs_fattr_init(data->res.dir_fattr);
}
@@ -2126,6 +2200,8 @@ static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_

static void nfs4_free_createdata(struct nfs4_createdata *data)
{
+ nfs_fattr_fini(&data->fattr);
+ nfs_fattr_fini(&data->dir_fattr);
kfree(data);
}

@@ -2958,6 +3034,9 @@ static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)

static void nfs4_delegreturn_release(void *calldata)
{
+ struct nfs4_delegreturndata *data = calldata;
+
+ nfs_fattr_fini(data->res.fattr);
kfree(calldata);
}

@@ -2983,7 +3062,7 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
};
int status = 0;

- data = kmalloc(sizeof(*data), GFP_KERNEL);
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
data->args.fhandle = &data->fh;
@@ -2997,6 +3076,11 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
data->timestamp = jiffies;
data->rpc_status = 0;

+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+ if (server->caps & NFS_CAP_SECURITY_LABEL)
+ nfs_fattr_alloc(&data->fattr, GFP_KERNEL);
+#endif
+
task_setup_data.callback_data = data;
msg.rpc_argp = &data->args,
msg.rpc_resp = &data->res,
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 4dbb84d..3ff1bdf 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -210,12 +210,14 @@ nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
};
int status;

- nfs_fattr_init(&fattr);
dprintk("NFS call create %s\n", dentry->d_name.name);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+ nfs_fattr_init(&fattr);
nfs_mark_for_revalidate(dir);
if (status == 0)
status = nfs_instantiate(dentry, &fhandle, &fattr);
+ nfs_fattr_fini(&fattr);
dprintk("NFS reply create: %d\n", status);
return status;
}
@@ -257,6 +259,7 @@ nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
}

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
nfs_fattr_init(&fattr);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_mark_for_revalidate(dir);
@@ -268,6 +271,7 @@ nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
}
if (status == 0)
status = nfs_instantiate(dentry, &fhandle, &fattr);
+ nfs_fattr_fini(&fattr);
dprintk("NFS reply mknod: %d\n", status);
return status;
}
@@ -380,6 +384,8 @@ nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,

dprintk("NFS call symlink %s\n", dentry->d_name.name);

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_mark_for_revalidate(dir);

@@ -394,6 +400,7 @@ nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
status = nfs_instantiate(dentry, &fhandle, &fattr);
}

+ nfs_fattr_fini(&fattr);
dprintk("NFS reply symlink: %d\n", status);
return status;
}
@@ -421,11 +428,14 @@ nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
int status;

dprintk("NFS call mkdir %s\n", dentry->d_name.name);
+
+ memset(&fattr, 0, sizeof(struct nfs_fattr));
nfs_fattr_init(&fattr);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_mark_for_revalidate(dir);
if (status == 0)
status = nfs_instantiate(dentry, &fhandle, &fattr);
+ nfs_fattr_fini(&fattr);
dprintk("NFS reply mkdir: %d\n", status);
return status;
}
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 256ce27..81cf6c5 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -377,6 +377,8 @@ static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
};
int error;

+ memset(&fattr, 0, sizeof(struct nfs_fattr));
+
error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
if (error < 0)
goto out_err;
@@ -408,10 +410,12 @@ static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)

buf->f_namelen = server->namelen;

+ nfs_fattr_fini(&fattr);
return 0;

out_err:
dprintk("%s: statfs error = %d\n", __func__, -error);
+ nfs_fattr_fini(&fattr);
return error;
}

diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 78a5922..192c056 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -355,6 +355,52 @@ static inline void nfs_fattr_init(struct nfs_fattr *fattr)
fattr->time_start = jiffies;
}

+#ifdef CONFIG_SECURITY
+void security_release_secctx(char *secdata, u32 seclen);
+
+static inline void nfs_fattr_alloc(struct nfs_fattr *fattr, gfp_t flags)
+{
+ fattr->label = kzalloc(NFS4_MAXLABELLEN, flags);
+ if (fattr->label == NULL)
+ panic("Can't allocate security label.");
+ fattr->label_len = NFS4_MAXLABELLEN;
+}
+
+#define nfs_fattr_fini(fattr) _nfs_fattr_fini(fattr, __FILE__, __LINE__, __func__)
+static inline void _nfs_fattr_fini(struct nfs_fattr *fattr,
+ const char *file, int line, const char *func)
+{
+ if ((fattr)->label == NULL) {
+ if (fattr->label_len != 0) {
+ printk(KERN_WARNING
+ "%s:%d %s() nfs_fattr label available (%d)\n",
+ file, line, func,
+ fattr->label_len);
+ }
+ } else {
+ if (fattr->label_len == NFS4_MAXLABELLEN)
+ printk(KERN_WARNING
+ "%s:%d %s() nfs_fattr label unused\n",
+ file, line, func);
+ else
+ if (fattr->label_len != (strlen(fattr->label) + 1))
+ printk(KERN_WARNING
+ "%s:%d %s() nfs_fattr label size mismatch (label_len %d, strlen %d)\n",
+ file, line, func,
+ fattr->label_len, strlen(fattr->label) + 1);
+
+
+ security_release_secctx(fattr->label, fattr->label_len);
+ fattr->label = NULL;
+ fattr->label_len = 0;
+ }
+}
+#else
+#define nfs_fattr_alloc(fattr, flags)
+#define nfs_fattr_fini(fattr)
+#endif
+
+
/*
* linux/fs/nfs/file.c
*/
--
1.5.5.1

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