linux-kernel - [PATCH 23/24] USB: serial: ftdi_sio: simplify TIOCGSERIAL permission check

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

Message-Id: <20210407103925.829-24-johan@kernel.org>
Date:   Wed,  7 Apr 2021 12:39:24 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 23/24] USB: serial: ftdi_sio: simplify TIOCGSERIAL permission check

Changing the deprecated custom_divisor field is an unprivileged
operation so after verifying that flag field does not contain any
privileged changes both updates can be carried out by any user.

Combine the two branches and drop the erroneous comment.

Note that private flags field is only used for ASYNC flags so there's no
need to try to retain any other bits when updating the flags.

Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/ftdi_sio.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 3fd7875200b9..9228e56a91c0 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1496,27 +1496,16 @@ static int set_serial_info(struct tty_struct *tty,
 	mutex_lock(&priv->cfg_lock);
 	old_priv = *priv;
 
-	/* Do error checking and permission checking */
-
 	if (!capable(CAP_SYS_ADMIN)) {
 		if ((ss->flags ^ priv->flags) & ~ASYNC_USR_MASK) {
 			mutex_unlock(&priv->cfg_lock);
 			return -EPERM;
 		}
-		priv->flags = ((priv->flags & ~ASYNC_USR_MASK) |
-			       (ss->flags & ASYNC_USR_MASK));
-		priv->custom_divisor = ss->custom_divisor;
-		goto check_and_exit;
 	}
 
-
-	/* Make the changes - these are privileged changes! */
-
-	priv->flags = ((priv->flags & ~ASYNC_FLAGS) |
-					(ss->flags & ASYNC_FLAGS));
+	priv->flags = ss->flags & ASYNC_FLAGS;
 	priv->custom_divisor = ss->custom_divisor;
 
-check_and_exit:
 	write_latency_timer(port);
 
 	if ((priv->flags ^ old_priv.flags) & ASYNC_SPD_MASK ||
-- 
2.26.3