Why would enabling FIPS mode in the kernel break CIFS mounts?

Solution Verified - Updated -

Issue

  • CIFS mounts work well as long as FIPS mode is disabled.
  • Enabling FIPS mode and rebooting the server results in CIFS mounts failing. The kernel logs show this as:
CIFS VFS: could not allocate crypto hmacmd5

CIFS VFS: could not setup hash structures rc -2
CIFS VFS: cifs_mount failed w/return code = -2
  • The only difference between the success or failure of the CIFS mount is fips mode as enabled via fips=1 on the kernel command line in grub.conf.
  • Is FIPS mode supported with CIFS mounts?

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content