From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 95)

Description of problem:
The passwd.c indicates that this is by design error:
passwd.c:L373
	i = read(STDIN_FILENO, newPassword,
	 sizeof(newPassword) - 1);
	newPassword[i - 1] = '\0';

I can assume this was done to strip line feed character when reading password 
from one-string files. This is not a correct behaviour. It's a user 
responsibility to supply just the data the user wants.

For compatibility reasons you may correct this error by introducing new option 
like '--not-strip'. When this option applied, passwd should not strip the last 
character.


Version-Release number of selected component (if applicable):
passwd-0.67-3

How reproducible:
Always

Steps to Reproduce:
1. Execute in bash:
echo -n boguspas | passwd --stdin someuser
2. Try to login as 'someuser'
    

Actual Results:  Can't login with 'boguspas', but can login with 'boguspa' 
password.

Expected Results:  Login with 'boguspas' password.