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Old 04-25-2011, 08:45 PM
Leann Ogasawara
 
Default IB/cm: Bump reference count on cm_id before invoking callback, CVE-2011-0695

On Mon, 2011-04-25 at 12:28 -0700, Brad Figg wrote:
> From: Sean Hefty <sean.hefty@intel.com>
>
> CVE-2011-0695
>
> BugLink: http://bugs.launchpad.net/bugs/770369
>
> When processing a SIDR REQ, the ib_cm allocates a new cm_id. The
> refcount of the cm_id is initialized to 1. However, cm_process_work
> will decrement the refcount after invoking all callbacks. The result
> is that the cm_id will end up with refcount set to 0 by the end of the
> sidr req handler.
>
> If a user tries to destroy the cm_id, the destruction will proceed,
> under the incorrect assumption that no other threads are referencing
> the cm_id. This can lead to a crash when the cm callback thread tries
> to access the cm_id.
>
> This problem was noticed as part of a larger investigation with kernel
> crashes in the rdma_cm when running on a real time OS.
>
> Signed-off-by: Sean Hefty <sean.hefty@intel.com>
> Acked-by: Doug Ledford <dledford@redhat.com>
> Cc: <stable@kernel.org>
> Signed-off-by: Roland Dreier <roland@purestorage.com>
>
> (backported from commit 29963437a48475036353b95ab142bf199adb909e)
> Signed-off-by: Brad Figg <brad.figg@canonical.com>

Acked-by: Leann Ogasawara <leann.ogasawara@canonical.com>

> ---
> drivers/infiniband/core/cm.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
> index 02110e0..c777dbd 100644
> --- a/drivers/infiniband/core/cm.c
> +++ b/drivers/infiniband/core/cm.c
> @@ -2648,6 +2648,7 @@ static int cm_sidr_req_handler(struct cm_work *work)
> goto out; /* No match. */
> }
> atomic_inc(&cur_cm_id_priv->refcount);
> + atomic_inc(&cm_id_priv->refcount);
> spin_unlock_irqrestore(&cm.lock, flags);
>
> cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
> --
> 1.7.0.4
>
>



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