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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sat, Oct 23, 2010 at 12:25:11PM +0400, Vasiliy Kulikov wrote:
> 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.

leaking of contents of kernel stack memory to userland,
not a memory leak, just to be clear.

> 
> 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,
> -- 
> 1.7.0.4

Ack.  

Thanks.

I would think hpsa needs a similar fix, and also cciss_ioctl32_big_passthru().
I suppose it's possible the big passthru alignment just "works out", (I haven't
checked), but even if that is the case, probably best not to rely on such an
accident,

-- steve


--
To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Kernel Development]     [Kernel Announce]     [Kernel Newbies]     [Linux Networking Development]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Device Mapper]

  Powered by Linux