Re: [RFC / BUG] mtd: provide proper 32/64-bit compat_ioctl() support for BLKPG

From: Brian Norris
Date: Mon Aug 31 2015 - 14:01:49 EST

On Fri, Aug 28, 2015 at 07:12:36PM -0700, Brian Norris wrote:
> The same bug applies to block/ioctl.c

Actually I'll correct myself: it looks like block/ already has OK
compat_ioctl support for this. Block devices do a copy to/from user
space to marshal a new struct. Personally, I find my approach a little

> But then: which tree should it go in?

I guess since this is only an MTD bug, then it'd be fair to take via
MTD. I'll plan to do that eventually if there are no objections.

> Tested only on MTD, with an ARM32 user space on an ARM64 kernel.
> Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx>
> ---
> drivers/mtd/mtdchar.c | 42 +++++++++++++++++++++++++++++++++---------
> include/uapi/linux/blkpg.h | 10 ++++++++++
> 2 files changed, 43 insertions(+), 9 deletions(-)

I also suspect it might make more sense to move the compat definitions
to a new non-UAPI include/linux/blkpg.h. I'll probably put that in v2.

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