linux-kernel - Re: [PATCH] mpt3sas_ctl: fix double-fetch bug in _ctl_ioctl

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Message-ID: <yq1ef4gy94k.fsf@oracle.com>
Date:   Wed, 29 May 2019 22:22:03 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Gen Zhang <blackgod016574@...il.com>
Cc:     sathya.prakash@...adcom.com, chaitra.basappa@...adcom.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        suganath-prabu.subramani@...adcom.com,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mpt3sas_ctl: fix double-fetch bug in _ctl_ioctl_main()


Gen,

> In _ctl_ioctl_main(), 'ioctl_header' is fetched the first time from 
> userspace. 'ioctl_header.ioc_number' is then checked. The legal result 
> is saved to 'ioc'. Then, in condition MPT3COMMAND, the whole struct is
> fetched again from the userspace. Then _ctl_do_mpt_command() is called,
> 'ioc' and 'karg' as inputs.
>
> However, a malicious user can change the 'ioc_number' between the two 
> fetches, which will cause a potential security issues.  Moreover, a 
> malicious user can provide a valid 'ioc_number' to pass the check in 
> first fetch, and then modify it in the second fetch.
>
> To fix this, we need to recheck the 'ioc_number' in the second fetch.

Applied to 5.3/scsi-queue, thanks.

-- 
Martin K. Petersen	Oracle Linux Engineering