linux-hardening - Re: [PATCH] scsi: aacraid: Allocate cmd

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Date:   Tue, 14 Feb 2023 11:57:33 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Bart Van Assche <bvanassche@....org>,
        Kees Cook <keescook@...omium.org>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Hannes Reinecke <hare@...e.de>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        linux-scsi@...r.kernel.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] scsi: aacraid: Allocate cmd_priv with scsicmd

On Fri, 27 Jan 2023 16:04:13 -0800, Kees Cook wrote:

> The aac_priv() helper assumes that the private cmd area immediately
> follows struct scsi_cmnd. Allocate this space as part of scsicmd,
> else there is a risk of heap overflow. Seen with GCC 13:
> 
> ../drivers/scsi/aacraid/aachba.c: In function 'aac_probe_container':
> ../drivers/scsi/aacraid/aachba.c:841:26: warning: array subscript 16 is outside array bounds of 'void[392]' [-Warray-bounds=]
>   841 |         status = cmd_priv->status;
>       |                          ^~
> In file included from ../include/linux/resource_ext.h:11,
>                  from ../include/linux/pci.h:40,
>                  from ../drivers/scsi/aacraid/aachba.c:22:
> In function 'kmalloc',
>     inlined from 'kzalloc' at ../include/linux/slab.h:720:9,
>     inlined from 'aac_probe_container' at ../drivers/scsi/aacraid/aachba.c:821:30:
> ../include/linux/slab.h:580:24: note: at offset 392 into object of size 392 allocated by 'kmalloc_trace'
>   580 |                 return kmalloc_trace(
>       |                        ^~~~~~~~~~~~~~
>   581 |                                 kmalloc_caches[kmalloc_type(flags)][index],
>       |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   582 |                                 flags, size);
>       |                                 ~~~~~~~~~~~~
> 
> [...]

Applied to 6.3/scsi-queue, thanks!

[1/1] scsi: aacraid: Allocate cmd_priv with scsicmd
      https://git.kernel.org/mkp/scsi/c/7ab734fc7598

-- 
Martin K. Petersen	Oracle Linux Engineering