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NFSv4.1: Ensure that test_stateid and free_stateid use correct credentials 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2013-05-20 11:20:27 -04:00
parent 965e9c23de
commit ab7cb0dfab
1 changed files with 50 additions and 15 deletions
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65
fs/nfs/nfs4proc.c
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@ -83,8 +83,10 @@ static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
struct nfs_fattr *fattr, struct iattr *sattr,
struct nfs4_state *state);
#ifdef CONFIG_NFS_V4_1
static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
struct rpc_cred *);
static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
struct rpc_cred *);
#endif
/* Prevent leaks of NFSv4 errors into userland */
static int nfs4_map_errors(int err)
@ -1855,18 +1857,30 @@ static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(state->inode);
nfs4_stateid *stateid = &state->stateid;
int status;
struct nfs_delegation *delegation;
struct rpc_cred *cred = NULL;
int status = -NFS4ERR_BAD_STATEID;
/* If a state reset has been done, test_stateid is unneeded */
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
return;
status = nfs41_test_stateid(server, stateid);
/* Get the delegation credential for use by test/free_stateid */
rcu_read_lock();
delegation = rcu_dereference(NFS_I(state->inode)->delegation);
if (delegation != NULL &&
nfs4_stateid_match(&delegation->stateid, stateid)) {
cred = get_rpccred(delegation->cred);
rcu_read_unlock();
status = nfs41_test_stateid(server, stateid, cred);
} else
rcu_read_unlock();
if (status != NFS_OK) {
/* Free the stateid unless the server explicitly
* informs us the stateid is unrecognized. */
if (status != -NFS4ERR_BAD_STATEID)
nfs41_free_stateid(server, stateid);
nfs41_free_stateid(server, stateid, cred);
nfs_remove_bad_delegation(state->inode);
write_seqlock(&state->seqlock);
@ -1874,6 +1888,9 @@ static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
write_sequnlock(&state->seqlock);
clear_bit(NFS_DELEGATED_STATE, &state->flags);
}
if (cred != NULL)
put_rpccred(cred);
}
/**
@ -1888,6 +1905,7 @@ static int nfs41_check_open_stateid(struct nfs4_state *state)
{
struct nfs_server *server = NFS_SERVER(state->inode);
nfs4_stateid *stateid = &state->open_stateid;
struct rpc_cred *cred = state->owner->so_cred;
int status;
/* If a state reset has been done, test_stateid is unneeded */
@ -1896,12 +1914,12 @@ static int nfs41_check_open_stateid(struct nfs4_state *state)
(test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
return -NFS4ERR_BAD_STATEID;
status = nfs41_test_stateid(server, stateid);
status = nfs41_test_stateid(server, stateid, cred);
if (status != NFS_OK) {
/* Free the stateid unless the server explicitly
* informs us the stateid is unrecognized. */
if (status != -NFS4ERR_BAD_STATEID)
nfs41_free_stateid(server, stateid);
nfs41_free_stateid(server, stateid, cred);
clear_bit(NFS_O_RDONLY_STATE, &state->flags);
clear_bit(NFS_O_WRONLY_STATE, &state->flags);
@ -5056,13 +5074,18 @@ static int nfs41_check_expired_locks(struct nfs4_state *state)
list_for_each_entry(lsp, &state->lock_states, ls_locks) {
if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
status = nfs41_test_stateid(server, &lsp->ls_stateid);
struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
status = nfs41_test_stateid(server,
&lsp->ls_stateid,
cred);
if (status != NFS_OK) {
/* Free the stateid unless the server
* informs us the stateid is unrecognized. */
if (status != -NFS4ERR_BAD_STATEID)
nfs41_free_stateid(server,
&lsp->ls_stateid);
&lsp->ls_stateid,
cred);
clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
ret = status;
}
@ -6737,7 +6760,9 @@ out:
return err;
}
static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
static int _nfs41_test_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred)
{
int status;
struct nfs41_test_stateid_args args = {
@ -6748,6 +6773,7 @@ static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = cred,
};
dprintk("NFS call test_stateid %p\n", stateid);
@ -6768,17 +6794,20 @@ static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
*
* @server: server / transport on which to perform the operation
* @stateid: state ID to test
* @cred: credential
*
* Returns NFS_OK if the server recognizes that "stateid" is valid.
* Otherwise a negative NFS4ERR value is returned if the operation
* failed or the state ID is not currently valid.
*/
static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
static int nfs41_test_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred)
{
struct nfs4_exception exception = { };
int err;
do {
err = _nfs41_test_stateid(server, stateid);
err = _nfs41_test_stateid(server, stateid, cred);
if (err != -NFS4ERR_DELAY)
break;
nfs4_handle_exception(server, err, &exception);
@ -6827,10 +6856,12 @@ const struct rpc_call_ops nfs41_free_stateid_ops = {
static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred,
bool privileged)
{
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
.rpc_cred = cred,
};
struct rpc_task_setup task_setup = {
.rpc_client = server->client,
@ -6863,16 +6894,19 @@ static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
*
* @server: server / transport on which to perform the operation
* @stateid: state ID to release
* @cred: credential
*
* Returns NFS_OK if the server freed "stateid". Otherwise a
* negative NFS4ERR value is returned.
*/
static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
static int nfs41_free_stateid(struct nfs_server *server,
nfs4_stateid *stateid,
struct rpc_cred *cred)
{
struct rpc_task *task;
int ret;
task = _nfs41_free_stateid(server, stateid, true);
task = _nfs41_free_stateid(server, stateid, cred, true);
if (IS_ERR(task))
return PTR_ERR(task);
ret = rpc_wait_for_completion_task(task);
@ -6885,8 +6919,9 @@ static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
{
struct rpc_task *task;
struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
task = _nfs41_free_stateid(server, &lsp->ls_stateid, false);
task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
nfs4_free_lock_state(server, lsp);
if (IS_ERR(task))
return PTR_ERR(task);