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-next>] [day] [month] [year] [list]
Date:   Tue, 22 Dec 2020 10:03:37 +0100
From:   "Ahmed S. Darwish" <>
To:     Michael Grzeschik <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
Cc:     LKML <>,
        Thomas Gleixner <>,
        "Sebastian A. Siewior" <>,
        "Ahmed S. Darwish" <>
Subject: [RFC PATCH 0/1] net: arcnet: Fix RESET sequence


At drivers/net/arcnet/arcnet.c, there is:

  irqreturn_t arcnet_interrupt(int irq, void *dev_id)
        if (status & RESETflag) {

  struct net_device_ops arcnet_netdev_ops = {
        .ndo_open = arcnet_open,
        .ndo_stop = arcnet_close,

which is wrong, in many ways:

  1) In general, interrupt handlers should never call ->ndo_stop() and
     ->ndo_open() functions. They are usually full of blocking calls and
     other methods that are expected to be called only from drivers
     init/exit code paths.

  2) arcnet_close() contains a del_timer_sync(). If the irq handler
     interrupts the to-be-deleted timer then call del_timer_sync(), it
     will just loop forever.

  3) arcnet_close() also calls tasklet_kill(), which has a warning if
     called from irq context.

  4) For device reset, the sequence "arcnet_close(); arcnet_open();" is
     not complete.  Some children arcnet drivers have special init/exit
     code sequences, which then embed a call to arcnet_open() and
     arcnet_close() accordingly. Check drivers/net/arcnet/com20020.c.

Included is an RFC patch to fix the points above: if the RESET flag is
encountered, a workqueue is scheduled to run the generic reset sequence.

Note: Only compile-tested, as I do not have the hardware in question.



Ahmed S. Darwish (1):
  net: arcnet: Fix RESET flag handling

 drivers/net/arcnet/arc-rimi.c     |  4 +-
 drivers/net/arcnet/arcdevice.h    |  6 +++
 drivers/net/arcnet/arcnet.c       | 69 +++++++++++++++++++++++++++++--
 drivers/net/arcnet/com20020-isa.c |  4 +-
 drivers/net/arcnet/com20020-pci.c |  2 +-
 drivers/net/arcnet/com20020_cs.c  |  2 +-
 drivers/net/arcnet/com90io.c      |  4 +-
 drivers/net/arcnet/com90xx.c      |  4 +-
 8 files changed, 81 insertions(+), 14 deletions(-)

base-commit: 2c85ebc57b3e1817b6ce1a6b703928e113a90442

Powered by blists - more mailing lists