| From | Kees Cook <> | Subject | [PATCH v2 56/63] RDMA/mlx5: Use struct_group() to zero struct mlx5_ib_mr | Date | Tue, 17 Aug 2021 23:05:26 -0700 |
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In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields.
Add struct_group() to mark region of struct mlx5_ib_mr that should be initialized to zero.
Cc: Leon Romanovsky <leon@kernel.org> Cc: Doug Ledford <dledford@redhat.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: linux-rdma@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> --- drivers/infiniband/hw/mlx5/mlx5_ib.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index bf20a388eabe..f63bf204a7a1 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -644,6 +644,7 @@ struct mlx5_ib_mr { struct ib_umem *umem; /* This is zero'd when the MR is allocated */ + struct_group(cleared, union { /* Used only while the MR is in the cache */ struct { @@ -691,12 +692,13 @@ struct mlx5_ib_mr { bool is_odp_implicit; }; }; + ); }; /* 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(&mr->cleared, 0, sizeof(mr->cleared)); } static inline bool is_odp_mr(struct mlx5_ib_mr *mr) -- 2.30.2
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