linux-kernel - RE: [PATCH 1/2] block: cciss: fix information leak to userland

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Message-ID: <0F5B06BAB751E047AB5C87D1F77A77887D0E280943@GVW0547EXC.americas.hpqcorp.net>
Date:	Mon, 25 Oct 2010 16:36:28 +0000
From:	"Miller, Mike (OS Dev)" <Mike.Miller@...com>
To:	"Miller, Mike (OS Dev)" <Mike.Miller@...com>,
	Vasiliy Kulikov <segooon@...il.com>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
CC:	Jens Axboe <jaxboe@...ionio.com>,
	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ISS StorageDev <iss_storagedev@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] block: cciss: fix information leak to userland



> -----Original Message-----
> From: Miller, Mike (OS Dev)
> Sent: Monday, October 25, 2010 9:41 AM
> To: Vasiliy Kulikov; kernel-janitors@...r.kernel.org
> Cc: Jens Axboe; Stephen M. Cameron; Andrew Morton; ISS StorageDev;
> linux-kernel@...r.kernel.org
> Subject: RE: [PATCH 1/2] block: cciss: fix information leak to userland
> 
> 
> 
> > -----Original Message-----
> > From: Vasiliy Kulikov [mailto:segooon@...il.com]
> > Sent: Saturday, October 23, 2010 3:25 AM
> > To: kernel-janitors@...r.kernel.org
> > Cc: Miller, Mike (OS Dev); Jens Axboe; Stephen M. Cameron;
> > Andrew Morton; ISS StorageDev; linux-kernel@...r.kernel.org
> > Subject: [PATCH 1/2] block: cciss: fix information leak to userland
> >
> > Structure IOCTL_Command_struct is copied to userland with
> > some padding fields at the end of the struct unitialized.
> > It leads to leaking of stack memory.
> >
> > Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
> > ---
> >  drivers/block/cciss.c |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> > index 762a81a..cd08324 100644
> > --- a/drivers/block/cciss.c
> > +++ b/drivers/block/cciss.c
> > @@ -1142,6 +1142,7 @@ static int
> > cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
> >  	int err;
> >  	u32 cp;
> >
> > +	memset(&arg64, 0, sizeof(arg64));
> >  	err = 0;
> >  	err |=
> >  	    copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
> > --
> 
> Acked-by: Mike Miller <mike.miller@...com>

BTW: this change needs to go into the cciss_ioctl32_big_passthru and the other passthru ioctls, also.

-- mikem

> 
> > 1.7.0.4
> >
> >
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