linux-kernel - Re: [PATCH V2] net/nfc/nci: fix infoleak in struct nci_set_config

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Date:   Wed, 2 Mar 2022 12:13:04 +0800
From:   "weiyongjun (A)" <weiyongjun1@...wei.com>
To:     "cgel.zte@...il.com" <cgel.zte@...il.com>,
        "krzysztof.kozlowski@...onical.com" 
        <krzysztof.kozlowski@...onical.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Minghao Chi (CGEL ZTE)" <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH V2] net/nfc/nci: fix infoleak in struct
 nci_set_config_param


> From: "Minghao Chi (CGEL ZTE)" <chi.minghao@....com.cn>
>
> On 64-bit systems, struct nci_set_config_param has
> an added padding of 7 bytes between struct members
> id and len. Even though all struct members are initialized,
> the 7-byte hole will contain data from the kernel stack.
> This patch zeroes out struct nci_set_config_param before
> usage, preventing infoleaks to userspace.


How this info leaks to userspace?


nci_set_config_req() convert to use packed 'struct nci_core_set_config_cmd'

to send data, which does not contain hole.