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I'd like you to clarify one topic with the customer before triaging this bugzilla.

"--with-misc-conv-bufsize" defines the value for PAM_MISC_CONV_BUFSIZE, that is used to read the input string in a PAM conversation (i.e. password input). The PAM_MAX_MSG_SIZE macro mentioned in the bugzilla title is mostly used by pam_echo for printing text messages to the user.

Can you confirm with the customer that their request is related to PAM conversation limits (a.k.a. PAM_MISC_CONV_BUFSIZE)? And not with pam_echo?

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 (pam 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-2023:7111