Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Description of problem:

When you copy a 5GB file to a Samba File Server using an encrypted SMB3 connection with AES-CCM, the used memory grows up to the file size. If you transfer a 5GB file it will use 5GB of RAM.

It doesn't happen with AES-GCM!

Samba creates a cipher handle and attches it to the SMB session to avoid reallocation during a file transfer. The memory is freed once the file is transferred.

For decryption we normally call gnutls_aead_cipher_decryptv2() which grows the memory to the file size using AES-CCM. It doesn't happen with gnutls_aead_cipher_decrypt().

Note that gnutls_aead_cipher_decryptv2() will be used in RHEL 8.3 with Samba 4.12. RHEL 8.2 used gnutls_aead_cipher_decrypt().

Someone created a MR for GnuTLS to address the issue, see https://gitlab.com/gnutls/gnutls/-/merge_requests/1277

Ping. When do we get a fix for RHEL 8.3?

Trying to add back the exception flag Mark, gave with the needed ITR/ITM fields

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (gnutls bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4526