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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