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From: Jason Gunthorpe <jgg@ziepe.ca>
To: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org, Leon Romanovsky <leon@kernel.org>,
	Doug Ledford <dledford@redhat.com>,
	linux-rdma@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev,
	linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org,
	clang-built-linux@googlegroups.com,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	linux-hardening@vger.kernel.org
Subject: Re: [PATCH v2 56/63] RDMA/mlx5: Use struct_group() to zero struct mlx5_ib_mr
Date: Thu, 19 Aug 2021 09:27:16 -0300	[thread overview]
Message-ID: <20210819122716.GP543798@ziepe.ca> (raw)
In-Reply-To: <20210818060533.3569517-57-keescook@chromium.org>

On Tue, Aug 17, 2021 at 11:05:26PM -0700, 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.
> 
> 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));
>  }

Why not use the memset_after(mr->umem) here?

Jason

  reply	other threads:[~2021-08-19 12:27 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210818060533.3569517-1-keescook@chromium.org>
2021-08-18  6:04 ` [PATCH v2 02/63] net/mlx5e: Avoid field-overflowing memcpy() Kees Cook
2021-08-18  6:04 ` [PATCH v2 21/63] net/mlx5e: Use struct_group() for memcpy() region Kees Cook
2021-08-18  6:05 ` [PATCH v2 46/63] iw_cxgb4: Use memset_startat() for cpl_t5_pass_accept_rpl Kees Cook
2021-08-18  6:05 ` [PATCH v2 48/63] IB/mthca: Use memset_startat() for clearing mpt_entry Kees Cook
2021-08-18  6:05 ` [PATCH v2 56/63] RDMA/mlx5: Use struct_group() to zero struct mlx5_ib_mr Kees Cook
2021-08-19 12:27   ` Jason Gunthorpe [this message]
2021-08-19 16:19     ` Kees Cook
2021-08-19 16:47       ` Jason Gunthorpe
2021-08-19 18:14         ` Kees Cook
2021-08-20 12:34           ` Jason Gunthorpe
2021-08-20 15:56             ` Kees Cook

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