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

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Date:   Fri, 27 Jan 2023 16:04:13 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Kees Cook <keescook@...omium.org>, 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>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] scsi: aacraid: Allocate cmd_priv with scsicmd

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);
      |                                 ~~~~~~~~~~~~

Fixes: 76a3451b64c6 ("scsi: aacraid: Move the SCSI pointer to private command data")
Cc: Bart Van Assche <bvanassche@....org>
Cc: Hannes Reinecke <hare@...e.de>
Cc: Himanshu Madhani <himanshu.madhani@...cle.com>
Cc: Adaptec OEM Raid Solutions <aacraid@...rosemi.com>
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org
Cc: stable@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/scsi/aacraid/aachba.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index 4d4cb47b3846..24c049eff157 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -818,8 +818,8 @@ static void aac_probe_container_scsi_done(struct scsi_cmnd *scsi_cmnd)
 
 int aac_probe_container(struct aac_dev *dev, int cid)
 {
-	struct scsi_cmnd *scsicmd = kzalloc(sizeof(*scsicmd), GFP_KERNEL);
-	struct aac_cmd_priv *cmd_priv = aac_priv(scsicmd);
+	struct aac_cmd_priv *cmd_priv;
+	struct scsi_cmnd *scsicmd = kzalloc(sizeof(*scsicmd) + sizeof(*cmd_priv), GFP_KERNEL);
 	struct scsi_device *scsidev = kzalloc(sizeof(*scsidev), GFP_KERNEL);
 	int status;
 
@@ -838,6 +838,7 @@ int aac_probe_container(struct aac_dev *dev, int cid)
 		while (scsicmd->device == scsidev)
 			schedule();
 	kfree(scsidev);
+	cmd_priv = aac_priv(scsicmd);
 	status = cmd_priv->status;
 	kfree(scsicmd);
 	return status;
-- 
2.34.1