What were you trying to do that didn't work?

`chpasswd` changes a user's password normally when SHA_CRYPT_MAX_ROUNDS is commented out. 

For whatever integer is specified in SHA_CRYPT_MAX_ROUNDS, `chpasswd` does not honour the value.

What is the impact of this issue to you?

`chpasswd` taking very long time to calculate a password hash

Please provide the package NVR for which the bug is seen:

shadow-utils-4.15.0-5.el10.x86_64

How reproducible is this bug?:

Steps to reproduce

# cat /etc/login.defs | grep SHA
ENCRYPT_METHOD SHA512
#SHA_CRYPT_MAX_ROUNDS 65535          <<<<<===== commented out

# echo 'jane:password' | chpasswd ;  <<<<<===== returns immediately
# grep jane /etc/shadow
jane:$6$zw0kufmCERVVev4p<...>:20504:0:99999:7:::


---

# cat /etc/login.defs | grep SHA
ENCRYPT_METHOD SHA512
SHA_CRYPT_MAX_ROUNDS 65535           <<<<<===== This integer value does not matter. 

# echo 'jane:password' | chpasswd ;  <<<<<===== taking very long time 
# grep jane /etc/shadow
jane:$6$rounds=657873445$p4CG4yGnsGg6SV8<...>:20504:0:99999:7:::
       ^^^^^^^^^^^^^^^^^ 

Expected results

chpasswd honours the SHA_CRYPT_MAX_ROUNDS value, and produce a password hash within reasonable time.

Actual results

chpasswd does not honour the SHA_CRYPT_MAX_ROUNDS value, and taking too much time when changing password.