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[PATCH] nfsd4: check lock type against openmode.

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We shouldn't be allowing, e.g., write locks on files not open for read.  To
enforce this, we add a pointer from the lock stateid back to the open stateid
it came from, so that the check will continue to be correct even after the
open is upgraded or downgraded.

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-07-07 17:59:27 -07:00 committed by Linus Torvalds
parent 3a4f98bbf4
commit 4c4cd222ee
2 changed files with 38 additions and 16 deletions
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49
fs/nfsd/nfs4state.c
View File

@ -1160,6 +1160,7 @@ init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *
stp->st_deny_bmap = 0;
__set_bit(open->op_share_access, &stp->st_access_bmap);
__set_bit(open->op_share_deny, &stp->st_deny_bmap);
stp->st_openstp = NULL;
}
static void
@ -2158,12 +2159,18 @@ out:
return status;
}
static inline int
setlkflg (int type)
{
return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
RD_STATE : WR_STATE;
}
/*
* Checks for sequence id mutating operations.
*/
static int
nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
{
struct nfs4_stateid *stp;
struct nfs4_stateowner *sop;
@ -2201,21 +2208,31 @@ nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *statei
goto check_replay;
}
/* for new lock stateowners:
* check that the lock->v.new.open_stateid
* refers to an open stateowner
*
* check that the lockclid (nfs4_lock->v.new.clientid) is the same
* as the open_stateid->st_stateowner->so_client->clientid
*/
if (lockclid) {
if (lock) {
struct nfs4_stateowner *sop = stp->st_stateowner;
clientid_t *lockclid = &lock->v.new.clientid;
struct nfs4_client *clp = sop->so_client;
int lkflg = 0;
int status;
lkflg = setlkflg(lock->lk_type);
if (lock->lk_is_new) {
if (!sop->so_is_open_owner)
return nfserr_bad_stateid;
if (!cmp_clid(&clp->cl_clientid, lockclid))
return nfserr_bad_stateid;
/* stp is the open stateid */
status = nfs4_check_openmode(stp, lkflg);
if (status)
return status;
} else {
/* stp is the lock stateid */
status = nfs4_check_openmode(stp->st_openstp, lkflg);
if (status)
return status;
}
if (!sop->so_is_open_owner)
return nfserr_bad_stateid;
if (!cmp_clid(&clp->cl_clientid, lockclid))
return nfserr_bad_stateid;
}
if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
@ -2642,6 +2659,7 @@ alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struc
stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
stp->st_access_bmap = open_stp->st_access_bmap;
stp->st_deny_bmap = open_stp->st_deny_bmap;
stp->st_openstp = open_stp;
out:
return stp;
@ -2697,8 +2715,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
lock->lk_new_open_seqid,
&lock->lk_new_open_stateid,
CHECK_FH | OPEN_STATE,
&open_sop, &open_stp,
&lock->v.new.clientid);
&open_sop, &open_stp, lock);
if (status)
goto out;
/* create lockowner and lock stateid */
@ -2726,7 +2743,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
lock->lk_old_lock_seqid,
&lock->lk_old_lock_stateid,
CHECK_FH | LOCK_STATE,
&lock->lk_stateowner, &lock_stp, NULL);
&lock->lk_stateowner, &lock_stp, lock);
if (status)
goto out;
}

5
include/linux/nfsd/state.h
View File

@ -237,6 +237,10 @@ struct nfs4_file {
* st_perlockowner: (open stateid) list of lock nfs4_stateowners
* st_access_bmap: used only for open stateid
* st_deny_bmap: used only for open stateid
* st_openstp: open stateid lock stateid was derived from
*
* XXX: open stateids and lock stateids have diverged sufficiently that
* we should consider defining separate structs for the two cases.
*/
struct nfs4_stateid {
@ -250,6 +254,7 @@ struct nfs4_stateid {
struct file * st_vfs_file;
unsigned long st_access_bmap;
unsigned long st_deny_bmap;
struct nfs4_stateid * st_openstp;
};
/* flags for preprocess_seqid_op() */