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authorChuck Lever <chuck.lever@oracle.com>2021-06-03 16:52:22 -0400
committerJ. Bruce Fields <bfields@redhat.com>2021-07-06 20:14:43 -0400
commit345b4159a075b15dc4ae70f1db90fa8abf85d2e7 (patch)
tree4f71b134a4f2355359ab192363107c440a313a05 /fs
parent7956521aac58e434a05cf3c68c1b66c1312e5649 (diff)
lockd: Update the NLMv4 TEST arguments decoder to use struct xdr_stream
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/lockd/xdr4.c72
1 files changed, 66 insertions, 6 deletions
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
index d0960a8551f8..cf64794fdc1f 100644
--- a/fs/lockd/xdr4.c
+++ b/fs/lockd/xdr4.c
@@ -97,6 +97,32 @@ nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
}
/*
+ * NLM file handles are defined by specification to be a variable-length
+ * XDR opaque no longer than 1024 bytes. However, this implementation
+ * limits their length to the size of an NFSv3 file handle.
+ */
+static bool
+svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
+{
+ __be32 *p;
+ u32 len;
+
+ if (xdr_stream_decode_u32(xdr, &len) < 0)
+ return false;
+ if (len > NFS_MAXFHSIZE)
+ return false;
+
+ p = xdr_inline_decode(xdr, len);
+ if (!p)
+ return false;
+ fh->size = len;
+ memcpy(fh->data, p, len);
+ memset(fh->data + len, 0, sizeof(fh->data) - len);
+
+ return true;
+}
+
+/*
* Encode and decode owner handle
*/
static __be32 *
@@ -135,6 +161,39 @@ nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
return p;
}
+static bool
+svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
+{
+ struct file_lock *fl = &lock->fl;
+ u64 len, start;
+ s64 end;
+
+ if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
+ return false;
+ if (!svcxdr_decode_fhandle(xdr, &lock->fh))
+ return false;
+ if (!svcxdr_decode_owner(xdr, &lock->oh))
+ return false;
+ if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
+ return false;
+ if (xdr_stream_decode_u64(xdr, &start) < 0)
+ return false;
+ if (xdr_stream_decode_u64(xdr, &len) < 0)
+ return false;
+
+ locks_init_lock(fl);
+ fl->fl_flags = FL_POSIX;
+ fl->fl_type = F_RDLCK;
+ end = start + len - 1;
+ fl->fl_start = s64_to_loff_t(start);
+ if (len == 0 || end < 0)
+ fl->fl_end = OFFSET_MAX;
+ else
+ fl->fl_end = s64_to_loff_t(end);
+
+ return true;
+}
+
/*
* Encode result of a TEST/TEST_MSG call
*/
@@ -189,19 +248,20 @@ nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
int
nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
{
+ struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_args *argp = rqstp->rq_argp;
- u32 exclusive;
+ u32 exclusive;
- if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+ if (!svcxdr_decode_cookie(xdr, &argp->cookie))
return 0;
-
- exclusive = ntohl(*p++);
- if (!(p = nlm4_decode_lock(p, &argp->lock)))
+ if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
+ return 0;
+ if (!svcxdr_decode_lock(xdr, &argp->lock))
return 0;
if (exclusive)
argp->lock.fl.fl_type = F_WRLCK;
- return xdr_argsize_check(rqstp, p);
+ return 1;
}
int