[CIFS] Upgrade default dialect to SMB3 from cifs (SMB1) for improved security

Steve French smfrench at gmail.com
Sat Jul 8 22:47:13 UTC 2017

Due to recent publicity about security vulnerabilities in the
much older CIFS dialect, these patches move the default dialect to the
widely accepted (and quite secure) SMB3.0 dialect from the
old default of the CIFS dialect.

We do not want to be encouraging use of less secure dialects,
and both Microsoft and CERT now strongly recommend not using the
older CIFS dialect (SMB Security Best Practices
"recommends disabling SMBv1").

SMB3 is both secure and widely available: in Windows 8 and later,
Samba and Macs.

Users can still choose to explicitly mount with the less secure
dialect (for old servers) by choosing "vers=1.0" on the cifs
mount e.g. to take advantage of Samba's "CIFS POSIX Extensions"

The two patches for this are attached and also at:



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