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-rw-r--r--fs/cifs/README5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/cifs/README b/fs/cifs/README
index 46c2cfa5acf3..7986d0d97ace 100644
--- a/fs/cifs/README
+++ b/fs/cifs/README
@@ -443,7 +443,10 @@ A partial list of the supported mount options follows:
SFU does). In the future the bottom 9 bits of the mode
mode also will be emulated using queries of the security
descriptor (ACL).
-sec Security mode. Allowed values are:
+ sign Must use packet signing (helps avoid unwanted data modification
+ by intermediate systems in the route). Note that signing
+ does not work with lanman or plaintext authentication.
+ sec Security mode. Allowed values are:
none attempt to connection as a null user (no name)
krb5 Use Kerberos version 5 authentication
krb5i Use Kerberos authentication and packet signing