On 9 May 2014 15:39, Yuvaraj Kumar C D <yuvaraj.cd@xxxxxxxxx> wrote:
> From: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
>
> The RPMB partition should only be accessed through the RPMB ioctls
> and not through read()/write(). This patch makes mmc_blk_open()
> reject open attempts to the RPMB partition in read or write mode.
>
> Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@xxxxxxxxxxx>
> ---
> drivers/mmc/card/block.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 452782b..fd59090 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -297,7 +297,15 @@ static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
> check_disk_change(bdev);
> ret = 0;
>
> - if ((mode & FMODE_WRITE) && md->read_only) {
> + /*
> + * Reject read/write access to the RPMB partition. It should
> + * only be accessed through ioctls.
> + */
> + if ((mode & (FMODE_READ | FMODE_WRITE)) &&
> + md->area_type & MMC_BLK_DATA_AREA_RPMB) {
> + mmc_blk_put(md);
> + ret = -EACCES;
How shall user space be able to receive a file descriptor, unless it's
allowed to open the device?
Kind regards
Ulf Hansson
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