On Sun, Feb 10, 2008 at 02:38:46PM +0100, Bartlomiej Zolnierkiewicz wrote:
> The OOPS is most likely (again) my fault - I was rushing out to push out
> the fix and memset() line didn't get converted.
The new patch works fine for me.
> I prepared the new patch, documented it and started looking into SCSI
> build breakage... and I no longer feel comfortable with the hack :(
>
> It seems that fixing IDE properly will be easier than auditing the whole
> SCSI for all the weird assumptions on rq->cmd[] size (James?) so I'm back
> to the code, in the meantime here's the updated patch:
Yeah, this is quite nasty. I'll attach the patch below which just
rejects a command in scsi_setup_blk_pc_cmnd if it's too large for
the scsi_cmnd cmnd array. This is probably enough but I haven't
audited all of the scsi code yet. But as James said this is
too much of a memory vastage to put it into the tree.
Long-term the Panasas folks have looked into killing the scsi_cmnd.cmnd
filed entirely and make the struct request.cmd field dynamically sized
which would solve your problem, but probably won't be ready for 2.6.25.
Index: linux-2.6/drivers/scsi/scsi_lib.c
===================================================================
--- linux-2.6.orig/drivers/scsi/scsi_lib.c 2008-02-10 07:49:50.000000000
+0100
+++ linux-2.6/drivers/scsi/scsi_lib.c 2008-02-10 15:19:42.000000000 +0100
@@ -1129,7 +1129,12 @@ int scsi_setup_blk_pc_cmnd(struct scsi_d
req->buffer = NULL;
}
- BUILD_BUG_ON(sizeof(req->cmd) > sizeof(cmd->cmnd));
+ if (req->cmd_len > sizeof(cmd->cmnd)) {
+ scsi_release_buffers(cmd);
+ scsi_put_command(cmd);
+ return BLKPREP_KILL;
+ }
+
memcpy(cmd->cmnd, req->cmd, sizeof(cmd->cmnd));
cmd->cmd_len = req->cmd_len;
if (!req->data_len)
-
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