linux-kernel - Re: [PATCH] Fix: buffer overflow during hvc

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Message-Id: <a8ab8fe3-3200-9591-7572-abbbd2d505ff@linux.ibm.com>
Date:   Mon, 6 Apr 2020 10:31:40 +1000
From:   Andrew Donnellan <ajd@...ux.ibm.com>
To:     andrew@...nix.com, virtualization@...ts.linux-foundation.org
Cc:     gregkh@...uxfoundation.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, jslaby@...e.com
Subject: Re: [PATCH] Fix: buffer overflow during hvc_alloc().

On 6/4/20 6:40 am, andrew@...nix.com wrote:
> From: Andrew Melnychenko <andrew@...nix.com>
> 
> If there is a lot(more then 16) of virtio-console devices
> or virtio_console module is reloaded
> - buffers 'vtermnos' and 'cons_ops' are overflowed.
> In older kernels it overruns spinlock which leads to kernel freezing:
> https://bugzilla.redhat.com/show_bug.cgi?id=1786239
> 

This Bugzilla report isn't publicly accessible. Can you include a 
relevant summary here and/or make the report publicly viewable?

If it does indeed lead to a kernel freeze, this should be tagged with a 
Fixes: and a Cc: stable@...r.kernel.org.

-- 
Andrew Donnellan              OzLabs, ADL Canberra
ajd@...ux.ibm.com             IBM Australia Limited