netdev - Re: [PATCH v2] af_key: add __GFP_ZERO flag for compose_sadb_supported in function pfkey

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Date:   Thu, 10 Mar 2022 07:42:01 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Haimin Zhang <tcs.kernel@...il.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
        Haimin Zhang <tcs_kernel@...cent.com>,
        TCS Robot <tcs_robot@...cent.com>
Subject: Re: [PATCH v2] af_key: add __GFP_ZERO flag for
 compose_sadb_supported in function pfkey_register

On Tue, Mar 08, 2022 at 11:20:28AM +0800, Haimin Zhang wrote:
> From: Haimin Zhang <tcs_kernel@...cent.com>
> 
> Add __GFP_ZERO flag for compose_sadb_supported in function pfkey_register
> to initialize the buffer of supp_skb to fix a kernel-info-leak issue.
> 1) Function pfkey_register calls compose_sadb_supported to request 
> a sk_buff. 2) compose_sadb_supported calls alloc_sbk to allocate
> a sk_buff, but it doesn't zero it. 3) If auth_len is greater 0, then
> compose_sadb_supported treats the memory as a struct sadb_supported and
> begins to initialize. But it just initializes the field sadb_supported_len
> and field sadb_supported_exttype without field sadb_supported_reserved.
> 
> Reported-by: TCS Robot <tcs_robot@...cent.com>
> Signed-off-by: Haimin Zhang <tcs_kernel@...cent.com>

Applied, thanks a lot!