lockd: Don't expose the process pid to the NLM server
Instead we use the nlm_lockowner->pid.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index da6354b..8ae79ae 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -125,7 +125,15 @@
list_for_each_entry(block, &nlm_blocked, b_list) {
struct file_lock *fl_blocked = block->b_lock;
- if (!nlm_compare_locks(fl_blocked, fl))
+ if (fl_blocked->fl_start != fl->fl_start)
+ continue;
+ if (fl_blocked->fl_end != fl->fl_end)
+ continue;
+ /*
+ * Careful! The NLM server will return the 32-bit "pid" that
+ * we put on the wire: in this case the lockowner "pid".
+ */
+ if (fl_blocked->fl_u.nfs_fl.owner->pid != lock->svid)
continue;
if (!nlm_cmp_addr(&block->b_host->h_addr, addr))
continue;
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 615a988..acc3eb1 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -132,8 +132,10 @@
memcpy(&lock->fh, NFS_FH(fl->fl_file->f_dentry->d_inode), sizeof(struct nfs_fh));
lock->caller = system_utsname.nodename;
lock->oh.data = req->a_owner;
- lock->oh.len = sprintf(req->a_owner, "%d@%s",
- current->pid, system_utsname.nodename);
+ lock->oh.len = snprintf(req->a_owner, sizeof(req->a_owner), "%u@%s",
+ (unsigned int)fl->fl_u.nfs_fl.owner->pid,
+ system_utsname.nodename);
+ lock->svid = fl->fl_u.nfs_fl.owner->pid;
locks_copy_lock(&lock->fl, fl);
}
@@ -159,6 +161,7 @@
/* set default data area */
call->a_args.lock.oh.data = call->a_owner;
+ call->a_args.lock.svid = lock->fl.fl_pid;
if (lock->oh.len > NLMCLNT_OHSIZE) {
void *data = kmalloc(lock->oh.len, GFP_KERNEL);
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 9cfced6..a525a14 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -397,6 +397,7 @@
(long long)fl->fl_end);
conflock->caller = "somehost"; /* FIXME */
conflock->oh.len = 0; /* don't return OH info */
+ conflock->svid = fl->fl_pid;
conflock->fl = *fl;
return nlm_lck_denied;
}
diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c
index 200fbda..1e984ab 100644
--- a/fs/lockd/xdr.c
+++ b/fs/lockd/xdr.c
@@ -131,10 +131,11 @@
|| !(p = nlm_decode_fh(p, &lock->fh))
|| !(p = nlm_decode_oh(p, &lock->oh)))
return NULL;
+ lock->svid = ntohl(*p++);
locks_init_lock(fl);
fl->fl_owner = current->files;
- fl->fl_pid = ntohl(*p++);
+ fl->fl_pid = (pid_t)lock->svid;
fl->fl_flags = FL_POSIX;
fl->fl_type = F_RDLCK; /* as good as anything else */
start = ntohl(*p++);
@@ -174,7 +175,7 @@
else
len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
- *p++ = htonl(fl->fl_pid);
+ *p++ = htonl(lock->svid);
*p++ = htonl(start);
*p++ = htonl(len);
@@ -197,7 +198,7 @@
struct file_lock *fl = &resp->lock.fl;
*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
- *p++ = htonl(fl->fl_pid);
+ *p++ = htonl(resp->lock.svid);
/* Encode owner handle. */
if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
@@ -298,7 +299,8 @@
memset(lock, 0, sizeof(*lock));
locks_init_lock(&lock->fl);
- lock->fl.fl_pid = ~(u32) 0;
+ lock->svid = ~(u32) 0;
+ lock->fl.fl_pid = (pid_t)lock->svid;
if (!(p = nlm_decode_cookie(p, &argp->cookie))
|| !(p = xdr_decode_string_inplace(p, &lock->caller,
@@ -415,7 +417,8 @@
memset(&resp->lock, 0, sizeof(resp->lock));
locks_init_lock(fl);
excl = ntohl(*p++);
- fl->fl_pid = ntohl(*p++);
+ resp->lock.svid = ntohl(*p++);
+ fl->fl_pid = (pid_t)resp->lock.svid;
if (!(p = nlm_decode_oh(p, &resp->lock.oh)))
return -EIO;
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
index fdcf105a..906ddc2 100644
--- a/fs/lockd/xdr4.c
+++ b/fs/lockd/xdr4.c
@@ -130,10 +130,11 @@
|| !(p = nlm4_decode_fh(p, &lock->fh))
|| !(p = nlm4_decode_oh(p, &lock->oh)))
return NULL;
+ lock->svid = ntohl(*p++);
locks_init_lock(fl);
fl->fl_owner = current->files;
- fl->fl_pid = ntohl(*p++);
+ fl->fl_pid = (pid_t)lock->svid;
fl->fl_flags = FL_POSIX;
fl->fl_type = F_RDLCK; /* as good as anything else */
p = xdr_decode_hyper(p, &start);
@@ -167,7 +168,7 @@
|| (fl->fl_end > NLM4_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
return NULL;
- *p++ = htonl(fl->fl_pid);
+ *p++ = htonl(lock->svid);
start = loff_t_to_s64(fl->fl_start);
if (fl->fl_end == OFFSET_MAX)
@@ -198,7 +199,7 @@
struct file_lock *fl = &resp->lock.fl;
*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
- *p++ = htonl(fl->fl_pid);
+ *p++ = htonl(resp->lock.svid);
/* Encode owner handle. */
if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
@@ -212,8 +213,8 @@
p = xdr_encode_hyper(p, start);
p = xdr_encode_hyper(p, len);
- dprintk("xdr: encode_testres (status %d pid %d type %d start %Ld end %Ld)\n",
- resp->status, fl->fl_pid, fl->fl_type,
+ dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
+ resp->status, (int)resp->lock.svid, fl->fl_type,
(long long)fl->fl_start, (long long)fl->fl_end);
}
@@ -303,7 +304,8 @@
memset(lock, 0, sizeof(*lock));
locks_init_lock(&lock->fl);
- lock->fl.fl_pid = ~(u32) 0;
+ lock->svid = ~(u32) 0;
+ lock->fl.fl_pid = (pid_t)lock->svid;
if (!(p = nlm4_decode_cookie(p, &argp->cookie))
|| !(p = xdr_decode_string_inplace(p, &lock->caller,
@@ -420,7 +422,8 @@
memset(&resp->lock, 0, sizeof(resp->lock));
locks_init_lock(fl);
excl = ntohl(*p++);
- fl->fl_pid = ntohl(*p++);
+ resp->lock.svid = ntohl(*p++);
+ fl->fl_pid = (pid_t)resp->lock.svid;
if (!(p = nlm4_decode_oh(p, &resp->lock.oh)))
return -EIO;