linux-kernel - [PATCH] tty: baudrate: Explicit usage of B0 for encoding input baudrate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20210927133516.8671-1-pali@kernel.org>
Date:   Mon, 27 Sep 2021 15:35:16 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] tty: baudrate: Explicit usage of B0 for encoding input baudrate

Function tty_termios_input_baud_rate() checks IBSHIFT & CBAUD against B0
constant to determinate if input speed equals to output speed. So do same
B0 check also in tty_termios_encode_baud_rate() function to make these two
functions compatible.

Currently macro B0 is defined to 0 so there is no functional change.

This change just make code more explicit to show that Bnnn constants are
stored in CBAUD.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 drivers/tty/tty_baudrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/tty_baudrate.c b/drivers/tty/tty_baudrate.c
index 426b1252781a..d903e111dbcb 100644
--- a/drivers/tty/tty_baudrate.c
+++ b/drivers/tty/tty_baudrate.c
@@ -154,7 +154,7 @@ void tty_termios_encode_baud_rate(struct ktermios *termios,
 	termios->c_ospeed = obaud;
 
 #ifdef IBSHIFT
-	if ((termios->c_cflag >> IBSHIFT) & CBAUD)
+	if (((termios->c_cflag >> IBSHIFT) & CBAUD) != B0)
 		ibinput = 1;	/* An input speed was specified */
 #endif
 #ifdef BOTHER
-- 
2.20.1