agetty: Incorrect handling of backspace characters 0x08, '#'

["Athlon" <Athlon_@xxxxxxx>]

Package: util-linux
Version: 2.21
Severity: normal

Hello.

Bug description:
1. Run agetty on a virtual console (tty1, ...).
2. Type in username: "root"
3. Input Alt+8 or #. The backspace character will proceed correctly, but it
will be printed as is instead of printing "\b \b".

Function get_logname (agetty.c) erases characters only if ECHO flag is off.
...
			case BS:
			case DEL:
			case '#':
				cp->erase = ascval; /* set erase character
*/
			if (bp > logname) {
					if ((tp->c_lflag & ECHO) == 0)
						write_all(1,
erase[cp->parity], 3);
					bp--;	
			}
...

But when running agetty on a virtual console function termio_init calls
reset_vc, that sets
tp->c_lflag |=  (ISIG | ICANON | IEXTEN | ECHO|ECHOE|ECHOK|ECHOKE);

So, backspace characters will be echoed on the console: "\b" moves cursor
left and '#' will be printed as is.


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