linux-kernel - Re: [scsi] 6aded12b10: kernel_BUG_at

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Message-ID: <20220323071409.GA25480@lst.de>
Date:   Wed, 23 Mar 2022 08:14:10 +0100
From:   Christoph Hellwig <hch@....de>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bart Van Assche <bvanassche@....org>,
        John Garry <john.garry@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com, Kees Cook <keescook@...omium.org>
Subject: Re: [scsi]  6aded12b10: kernel_BUG_at_mm/usercopy.c

The actual warning is;

[   34.496096][  T331] usercopy: Kernel memory overwrite attempt detected to spans multiple pages (off set 0, size 6)!

This is for the cmnd field in struct scsi_cmnd, which is allocated by
the block layer as part of the request allocator.  So with a specific
packing it can legitimately span pages.

Kees: how can we annotate that this is ok?