On Fri, Sep 15, 2023 at 12:06:21PM -0600, Gustavo A. R. Silva wrote:
>
>
> On 9/14/23 21:29, Kees Cook wrote:
> > On Mon, Sep 11, 2023 at 05:27:59PM -0600, Gustavo A. R. Silva wrote:
> > > Harden calls to struct_size() with size_add() and size_mul().
> >
> > Specifically, make sure that open-coded arithmetic cannot cause an
> > overflow/wraparound. (i.e. it will stay saturated at SIZE_MAX.)
>
> Yep; I have another patch where I explain this in similar terms.
>
> I'll send it, shortly.
You missed other places with similar arithmetic.
drivers/infiniband/core/device.c: pdata_rcu = kzalloc(struct_size(pdata_rcu, pdata,
drivers/infiniband/core/device.c- rdma_end_port(device) + 1),
drivers/infiniband/core/device.c- GFP_KERNEL);
drivers/infiniband/core/sa_query.c: sa_dev = kzalloc(struct_size(sa_dev, port, e - s + 1), GFP_KERNEL);
drivers/infiniband/core/user_mad.c: umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);
Thanks
>
> >
> > >
> > > Fixes: 467f432a521a ("RDMA/core: Split port and device counter sysfs attributes")
> > > Fixes: a4676388e2e2 ("RDMA/core: Simplify how the gid_attrs sysfs is created")
> > > Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
> >
> > Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
>
> Thanks!
>
> --
> Gustavo
>
> >
> > -Kees
> >
> > > ---
> > > Changes in v2:
> > > - Update changelog text: remove the part about binary differences (it
> > > was added by mistake).
> > >
> > > drivers/infiniband/core/sysfs.c | 10 +++++-----
> > > 1 file changed, 5 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
> > > index ee59d7391568..ec5efdc16660 100644
> > > --- a/drivers/infiniband/core/sysfs.c
> > > +++ b/drivers/infiniband/core/sysfs.c
> > > @@ -903,7 +903,7 @@ alloc_hw_stats_device(struct ib_device *ibdev)
> > > * Two extra attribue elements here, one for the lifespan entry and
> > > * one to NULL terminate the list for the sysfs core code
> > > */
> > > - data = kzalloc(struct_size(data, attrs, stats->num_counters + 1),
> > > + data = kzalloc(struct_size(data, attrs, size_add(stats->num_counters, 1)),
> > > GFP_KERNEL);
> > > if (!data)
> > > goto err_free_stats;
> > > @@ -1009,7 +1009,7 @@ alloc_hw_stats_port(struct ib_port *port, struct attribute_group *group)
> > > * Two extra attribue elements here, one for the lifespan entry and
> > > * one to NULL terminate the list for the sysfs core code
> > > */
> > > - data = kzalloc(struct_size(data, attrs, stats->num_counters + 1),
> > > + data = kzalloc(struct_size(data, attrs, size_add(stats->num_counters, 1)),
> > > GFP_KERNEL);
> > > if (!data)
> > > goto err_free_stats;
> > > @@ -1140,7 +1140,7 @@ static int setup_gid_attrs(struct ib_port *port,
> > > int ret;
> > > gid_attr_group = kzalloc(struct_size(gid_attr_group, attrs_list,
> > > - attr->gid_tbl_len * 2),
> > > + size_mul(attr->gid_tbl_len, 2)),
> > > GFP_KERNEL);
> > > if (!gid_attr_group)
> > > return -ENOMEM;
> > > @@ -1205,8 +1205,8 @@ static struct ib_port *setup_port(struct ib_core_device *coredev, int port_num,
> > > int ret;
> > > p = kvzalloc(struct_size(p, attrs_list,
> > > - attr->gid_tbl_len + attr->pkey_tbl_len),
> > > - GFP_KERNEL);
> > > + size_add(attr->gid_tbl_len, attr->pkey_tbl_len)),
> > > + GFP_KERNEL);
> > > if (!p)
> > > return ERR_PTR(-ENOMEM);
> > > p->ibdev = device;
> > > --
> > > 2.34.1
> > >
> >
