[SCSI] aacraid: prohibit access to array container space

Problem description:
--------------------

The issue reported by one of the customer was able to read LBA beyond
the array reported size with "sg_read" utility. If N is the last block
address reported, then should not be able to read past N,
i.e. N+1. But in their case, reported last LBA=143134719.  So should
not have been able to read with LBA=143134720, but it is read without
failure, which means reported size to the OS is not correct and is
less than the actual last block address.

Solution:
---------

Firmware layer exposes lesser container capacity than the actual
one. It exposes [Actual size - Spitfire space(10MB)] to the OS, IO's
to the 10MB should be prohibited from the Linux driver. Driver checks
LBA boundary, if its greater than the array reported size then sets
sensekey to HARDWARE_ERROR and sends the notification to the MID
layer.

Signed-off-by: Mahesh Rajashekhara <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index fdc7d9935aeb..7df2dd1d2c6f 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -1608,6 +1608,7 @@ static int aac_read(struct scsi_cmnd * scsicmd)
         int status;
         struct aac_dev *dev;
         struct fib * cmd_fibcontext;
+        int cid;
 
         dev = (struct aac_dev *)scsicmd->device->host->hostdata;
         /*
@@ -1657,6 +1658,22 @@ static int aac_read(struct scsi_cmnd * scsicmd)
                 count = (scsicmd->cmnd[7] << 8) | scsicmd->cmnd[8];
                 break;
         }
+
+        if ((lba + count) > (dev->fsa_dev[scmd_id(scsicmd)].size)) {
+                cid = scmd_id(scsicmd);
+                dprintk((KERN_DEBUG "aacraid: Illegal lba\n"));
+                scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 |
+                        SAM_STAT_CHECK_CONDITION;
+                set_sense(&dev->fsa_dev[cid].sense_data,
+                          HARDWARE_ERROR, SENCODE_INTERNAL_TARGET_FAILURE,
+                          ASENCODE_INTERNAL_TARGET_FAILURE, 0, 0);
+                memcpy(scsicmd->sense_buffer, &dev->fsa_dev[cid].sense_data,
+                       min_t(size_t, sizeof(dev->fsa_dev[cid].sense_data),
+                             SCSI_SENSE_BUFFERSIZE));
+                scsicmd->scsi_done(scsicmd);
+                return 1;
+        }
+
         dprintk((KERN_DEBUG "aac_read[cpu %d]: lba = %llu, t = %ld.\n",
           smp_processor_id(), (unsigned long long)lba, jiffies));
         if (aac_adapter_bounds(dev,scsicmd,lba))
@@ -1698,6 +1715,7 @@ static int aac_write(struct scsi_cmnd * scsicmd)
         int status;
         struct aac_dev *dev;
         struct fib * cmd_fibcontext;
+        int cid;
 
         dev = (struct aac_dev *)scsicmd->device->host->hostdata;
         /*
@@ -1737,6 +1755,22 @@ static int aac_write(struct scsi_cmnd * scsicmd)
                 count = (scsicmd->cmnd[7] << 8) | scsicmd->cmnd[8];
                 fua = scsicmd->cmnd[1] & 0x8;
         }
+
+        if ((lba + count) > (dev->fsa_dev[scmd_id(scsicmd)].size)) {
+                cid = scmd_id(scsicmd);
+                dprintk((KERN_DEBUG "aacraid: Illegal lba\n"));
+                scsicmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8 |
+                        SAM_STAT_CHECK_CONDITION;
+                set_sense(&dev->fsa_dev[cid].sense_data,
+                          HARDWARE_ERROR, SENCODE_INTERNAL_TARGET_FAILURE,
+                          ASENCODE_INTERNAL_TARGET_FAILURE, 0, 0);
+                memcpy(scsicmd->sense_buffer, &dev->fsa_dev[cid].sense_data,
+                       min_t(size_t, sizeof(dev->fsa_dev[cid].sense_data),
+                             SCSI_SENSE_BUFFERSIZE));
+                scsicmd->scsi_done(scsicmd);
+                return 1;
+        }
+
         dprintk((KERN_DEBUG "aac_write[cpu %d]: lba = %llu, t = %ld.\n",
           smp_processor_id(), (unsigned long long)lba, jiffies));
         if (aac_adapter_bounds(dev,scsicmd,lba))