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

[Miller, Mike (OS Dev)]

> -----Original Message-----
> From: Miller, Mike (OS Dev)
> Sent: Monday, October 25, 2010 9:41 AM
> To: Vasiliy Kulikov; kernel-janitors@xxxxxxxxxxxxxxx
> Cc: Jens Axboe; Stephen M. Cameron; Andrew Morton; ISS StorageDev;
> linux-kernel@xxxxxxxxxxxxxxx
> Subject: RE: [PATCH 1/2] block: cciss: fix information leak to userland
> 
> 
> 
> > -----Original Message-----
> > From: Vasiliy Kulikov [mailto:segooon@xxxxxxxxx]
> > Sent: Saturday, October 23, 2010 3:25 AM
> > To: kernel-janitors@xxxxxxxxxxxxxxx
> > Cc: Miller, Mike (OS Dev); Jens Axboe; Stephen M. Cameron;
> > Andrew Morton; ISS StorageDev; linux-kernel@xxxxxxxxxxxxxxx
> > 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@xxxxxxxxx>
> > ---
> >  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@xxxxxx>

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

-- mikem

> 
> > 1.7.0.4
> >
> >
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/