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Date: Sun, 21 Nov 2021 15:54:55 +0200 From: Leon Romanovsky <leon@...nel.org> To: Kees Cook <keescook@...omium.org> Cc: Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>, linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] RDMA/mlx5: Use memset_after() to zero struct mlx5_ib_mr On Thu, Nov 18, 2021 at 12:31:38PM -0800, Kees Cook wrote: > In preparation for FORTIFY_SOURCE performing compile-time and run-time > field bounds checking for memset(), avoid intentionally writing across > neighboring fields. > > Use memset_after() to zero the end of struct mlx5_ib_mr that should > be initialized. > > Signed-off-by: Kees Cook <keescook@...omium.org> > --- > drivers/infiniband/hw/mlx5/mlx5_ib.h | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h > index e636e954f6bf..af94c9fe8753 100644 > --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h > +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h > @@ -665,8 +665,7 @@ struct mlx5_ib_mr { > /* User MR data */ > struct mlx5_cache_ent *cache_ent; > struct ib_umem *umem; > - > - /* This is zero'd when the MR is allocated */ > + /* Everything after umem is zero'd when the MR is allocated */ > union { > /* Used only while the MR is in the cache */ > struct { > @@ -718,7 +717,7 @@ struct mlx5_ib_mr { > /* Zero the fields in the mr that are variant depending on usage */ > static inline void mlx5_clear_mr(struct mlx5_ib_mr *mr) > { > - memset(mr->out, 0, sizeof(*mr) - offsetof(struct mlx5_ib_mr, out)); > + memset_after(mr, 0, umem); I think that it is not equivalent change and you need "memset_after(mr, 0, cache_ent);" to clear umem pointer too. > } > > static inline bool is_odp_mr(struct mlx5_ib_mr *mr) > -- > 2.30.2 >
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