linux-kernel - Re: [PATCH] tty: hvc: Fix data abort due to race in hvc

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: <831bf548-a461-6160-f878-ee0f4c5c311b@web.de>
Date:   Tue, 28 Apr 2020 14:48:38 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Raghavendra Rao Ananta <rananta@...eaurora.org>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org,
        Andrew Melnychenko <andrew@...nix.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH] tty: hvc: Fix data abort due to race in hvc_open

> Hence, serialize hvc_open and check if tty->private_data is NULL before
> proceeding ahead.

How do you think about to add the tag “Fixes” because of adjustments
for the data synchronisation?


…
> +++ b/drivers/tty/hvc/hvc_console.c
…
@@ -384,6 +394,8 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
…
> +out:
> +	mutex_unlock(&hvc_open_mutex);
>  	return rc;
>  }

I suggest to use the label “unlock” instead.

Regards,
Markus