From: Dan Carpenter <dan.carpenter@oracle.com> To: Doug Ledford <dledford@redhat.com>, Matan Barak <matanb@mellanox.com> Cc: Jason Gunthorpe <jgg@ziepe.ca>, Yishai Hadas <yishaih@mellanox.com>, Leon Romanovsky <leon@kernel.org>, Shamir Rabinovitch <shamir.rabinovitch@oracle.com>, Michael Guralnik <michaelgur@mellanox.com>, Matthew Wilcox <willy@infradead.org>, linux-rdma@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH v2] uverbs: prevent potential underflow Date: Fri, 11 Oct 2019 16:34:19 +0300 [thread overview] Message-ID: <20191011133419.GA22905@mwanda> (raw) In-Reply-To: <20191008194425.GA28067@ziepe.ca> The issue is in drivers/infiniband/core/uverbs_std_types_cq.c in the UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE) function. We check that: if (attr.comp_vector >= attrs->ufile->device->num_comp_vectors) { But we don't check that "attr.comp_vector" whether negative. It could potentially lead to an array underflow. My concern would be where cq->vector is used in the create_cq() function from the cxgb4 driver. And really "attr.comp_vector" is appears as a u32 to user space so that's the right type to use. Fixes: 9ee79fce3642 ("IB/core: Add completion queue (cq) object actions") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> --- v2: Change both types to u32 drivers/infiniband/core/uverbs.h | 2 +- include/rdma/ib_verbs.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h index 1e5aeb39f774..63f7f7db5902 100644 --- a/drivers/infiniband/core/uverbs.h +++ b/drivers/infiniband/core/uverbs.h @@ -98,7 +98,7 @@ ib_uverbs_init_udata_buf_or_null(struct ib_udata *udata, struct ib_uverbs_device { atomic_t refcount; - int num_comp_vectors; + u32 num_comp_vectors; struct completion comp; struct device dev; /* First group for device attributes, NULL terminated array */ diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 6a47ba85c54c..e7e733add99f 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -366,7 +366,7 @@ struct ib_tm_caps { struct ib_cq_init_attr { unsigned int cqe; - int comp_vector; + u32 comp_vector; u32 flags; }; -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com> To: Doug Ledford <dledford@redhat.com>, Matan Barak <matanb@mellanox.com> Cc: Jason Gunthorpe <jgg@ziepe.ca>, Yishai Hadas <yishaih@mellanox.com>, Leon Romanovsky <leon@kernel.org>, Shamir Rabinovitch <shamir.rabinovitch@oracle.com>, Michael Guralnik <michaelgur@mellanox.com>, Matthew Wilcox <willy@infradead.org>, linux-rdma@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH v2] uverbs: prevent potential underflow Date: Fri, 11 Oct 2019 13:34:19 +0000 [thread overview] Message-ID: <20191011133419.GA22905@mwanda> (raw) In-Reply-To: <20191008194425.GA28067@ziepe.ca> The issue is in drivers/infiniband/core/uverbs_std_types_cq.c in the UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE) function. We check that: if (attr.comp_vector >= attrs->ufile->device->num_comp_vectors) { But we don't check that "attr.comp_vector" whether negative. It could potentially lead to an array underflow. My concern would be where cq->vector is used in the create_cq() function from the cxgb4 driver. And really "attr.comp_vector" is appears as a u32 to user space so that's the right type to use. Fixes: 9ee79fce3642 ("IB/core: Add completion queue (cq) object actions") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> --- v2: Change both types to u32 drivers/infiniband/core/uverbs.h | 2 +- include/rdma/ib_verbs.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h index 1e5aeb39f774..63f7f7db5902 100644 --- a/drivers/infiniband/core/uverbs.h +++ b/drivers/infiniband/core/uverbs.h @@ -98,7 +98,7 @@ ib_uverbs_init_udata_buf_or_null(struct ib_udata *udata, struct ib_uverbs_device { atomic_t refcount; - int num_comp_vectors; + u32 num_comp_vectors; struct completion comp; struct device dev; /* First group for device attributes, NULL terminated array */ diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 6a47ba85c54c..e7e733add99f 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -366,7 +366,7 @@ struct ib_tm_caps { struct ib_cq_init_attr { unsigned int cqe; - int comp_vector; + u32 comp_vector; u32 flags; }; -- 2.20.1
next prev parent reply other threads:[~2019-10-11 13:35 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-10-05 5:23 [PATCH] uverbs: prevent potential underflow Dan Carpenter 2019-10-05 5:23 ` Dan Carpenter 2019-10-08 19:44 ` Jason Gunthorpe 2019-10-08 19:44 ` Jason Gunthorpe 2019-10-09 7:35 ` Dan Carpenter 2019-10-09 7:35 ` Dan Carpenter 2019-10-11 13:34 ` Dan Carpenter [this message] 2019-10-11 13:34 ` [PATCH v2] " Dan Carpenter 2019-10-22 18:15 ` Jason Gunthorpe 2019-10-22 18:15 ` Jason Gunthorpe
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