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  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]
Date:   Sat, 16 Jan 2021 13:20:33 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 1/2] net: dsa: mv88e6xxx: also read STU state in mv88e6250_g1_vtu_getnext

On Sat, Jan 16, 2021 at 03:39, Rasmus Villemoes <rasmus.villemoes@...vas.dk> wrote:
> mv88e6xxx_port_vlan_join checks whether the VTU already contains an
> entry for the given vid (via mv88e6xxx_vtu_getnext), and if so, merely
> changes the relevant .member[] element and loads the updated entry
> into the VTU.
>
> However, at least for the mv88e6250, the on-stack struct
> mv88e6xxx_vtu_entry vlan never has its .state[] array explicitly
> initialized, neither in mv88e6xxx_port_vlan_join() nor inside the
> getnext implementation. So the new entry has random garbage for the
> STU bits, breaking VLAN filtering.
>
> When the VTU entry is initially created, those bits are all zero, and
> we should make sure to keep them that way when the entry is updated.
>
> Fixes: 92307069a96c (net: dsa: mv88e6xxx: Avoid VTU corruption on 6097)
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>

Reviewed-by: Tobias Waldekranz <tobias@...dekranz.com>
Tested-by: Tobias Waldekranz <tobias@...dekranz.com>

Powered by blists - more mailing lists