[CIFS] add ver= prefix to upcall format version

Acked-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Igor Mammedov <niallan@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c
index ad54a3a6e43490eff48f2e579a2ce60f687fbb01..d79eee41e9c5924a10196297409ab14bfcfc1d84 100644 (file)
--- a/fs/cifs/cifs_spnego.c
+++ b/fs/cifs/cifs_spnego.c
@@ -66,6 +66,11 @@ struct key_type cifs_spnego_key_type = {
        .describe       = user_describe,
 };
 
+#define MAX_VER_STR_LEN   9 /* length of longest version string e.g.
+                               strlen(";ver=0xFF) */
+#define MAX_MECH_STR_LEN 13 /* length of longest security mechanism name, eg
+                              in future could have strlen(";sec=ntlmsspi") */
+#define MAX_IPV6_ADDR_LEN 42 /* eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/60 */
 /* get a key struct with a SPNEGO security blob, suitable for session setup */
 struct key *
 cifs_get_spnego_key(struct cifsSesInfo *sesInfo, const char *hostname)
@@ -75,11 +80,11 @@ cifs_get_spnego_key(struct cifsSesInfo *sesInfo, const char *hostname)
        size_t desc_len;
        struct key *spnego_key;
 
-
-       /* version + ;ip{4|6}= + address + ;host=hostname +
-               ;sec= + ;uid= + NULL */
-       desc_len = 4 + 5 + 32 + 1 + 5 + strlen(hostname) +
-                  strlen(";sec=krb5") + 7 + sizeof(uid_t)*2 + 1;
+       /* BB: come up with better scheme for determining length */
+       /* length of fields (with semicolons): ver=0xyz ipv4= ipaddress host=
+          hostname sec=mechanism uid=0x uid */
+       desc_len = MAX_VER_STR_LEN + 5 + MAX_IPV6_ADDR_LEN + 1 + 6 +
+                 strlen(hostname) + MAX_MECH_STR_LEN + 8 + (sizeof(uid_t) * 2);
        spnego_key = ERR_PTR(-ENOMEM);
        description = kzalloc(desc_len, GFP_KERNEL);
        if (description == NULL)
@@ -88,7 +93,7 @@ cifs_get_spnego_key(struct cifsSesInfo *sesInfo, const char *hostname)
        dp = description;
        /* start with version and hostname portion of UNC string */
        spnego_key = ERR_PTR(-EINVAL);
-       sprintf(dp, "0x%2.2x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
+       sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
                hostname);
        dp = description + strlen(description);