linux-kernel - Re: [PATCH resend] bsg: Fix sense buffer bug in SG

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Message-ID: <20090203070412.GR30821@kernel.dk>
Date:	Tue, 3 Feb 2009 08:04:13 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	bharrosh@...asas.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, osd-dev@...n-osd.org
Subject: Re: [PATCH resend] bsg: Fix sense buffer bug in SG_IO

On Tue, Feb 03 2009, FUJITA Tomonori wrote:
> On Tue, 03 Feb 2009 08:34:07 +0200
> Boaz Harrosh <bharrosh@...asas.com> wrote:
> 
> > 
> > When submitting requests via SG_IO, which does a sync io, a
> > bsg_command is not allocated. So an in-Kernel sense_buffer was not
> > set. However when calling blk_execute_rq() with no sense buffer
> > one is provided from the stack. Now bsg at blk_complete_sgv4_hdr_rq()
> > would check if rq->sense_len and a sense was requested by sg_io_v4
> > the rq->sense was copy_user() back, but by now it is already mangled
> > stack memory.
> > 
> > I have fixed that by forcing a sense_buffer when calling bsg_map_hdr().
> > The bsg_command->sense is provided in the write/read path like before,
> > and on-the-stack buffer is provided when doing SG_IO.
> > 
> > I have also fixed a dprintk message to print rq->errors in hex because
> > of the scsi bit-field use of this member. For other block devices it
> > does not matter anyway.
> > 
> > Signed-off-by: Boaz Harrosh <bharrosh@...asas.com>
> > ---
> >  block/bsg.c |   17 ++++++++++-------
> >  1 files changed, 10 insertions(+), 7 deletions(-)
> 
> Acked-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> 
> 
> I think I did this in the previous submission though.

Yeah, I also added it.

-- 
Jens Axboe

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