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SubjectRe: [PATCH v3 00/26] compat_ioctl: cleanups
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On 2019-04-16 4:19 p.m., Arnd Bergmann wrote:
> Hi Al,
>
> It took me way longer than I had hoped to revisit this series, see
> https://lore.kernel.org/lkml/20180912150142.157913-1-arnd@arndb.de/
> for the previously posted version.
>
> I've come to the point where all conversion handlers and most
> COMPATIBLE_IOCTL() entries are gone from this file, but for
> now, this series only has the parts that have either been reviewed
> previously, or that are simple enough to include.
>
> The main missing piece is the SG_IO/SG_GET_REQUEST_TABLE conversion.
> I'll post the patches I made for that later, as they need more
> testing and review from the scsi maintainers.

Perhaps you could look at the document in this url:
http://sg.danny.cz/sg/sg_v40.html

It is work-in-progress to modernize the SCSI generic driver. It
extends ioctl(sg_fd, SG_IO, &pt_obj) to additionally accept the sg v4
interface as defined in include/uapi/linux/bsg.h . Currently only the
bsg driver uses the sg v4 interface. Since struct sg_io_v4 is all
explicitly sized integers, I'm guessing it is immune "compat" problems.
[I can see no reference to bsg nor struct sg_io_v4 in the current
fs/compat_ioctl.c file.]

Other additions described in the that document are these new ioctls:
- SG_IOSUBMIT ultimately to replace write(sg_fd, ...)
- SG_IORECEIVE to replace read(sg_fd, ...)
- SG_IOABORT abort SCSI cmd in progress; new functionality
- SG_SET_GET_EXTENDED has associated struct sg_extended_info

The first three take a pointer to a struct sg_io_hdr (v3 interface) or
a struct sg_io_v4 object. Both objects start with a 32 bit integer:
'S' identifies the v3 interface while 'Q' identifies the v4 interface.

The SG_SET_GET_EXTENDED ioctl takes a pointer to a struct
sg_extended_info object which contains explicitly sized integers so it
may also be immune from "compat" problems. The ioctls section (13) of
that document referenced above has a table showing how many "sets and
gets" are hiding in the SG_SET_GET_EXTENDED ioctl.

BTW No change is proposed for this case:
ioctl(normal_block_device, SG_IO, &sg_v3_obj)
which is handled by block/scsi_ioctl.c


This would be a good time for me to address any "compat" concerns in the
proposed sg driver update.

Doug Gilbert


> I hope you can still take these for the coming merge window, unless
> new problems come up.
>
> Arnd
>
> Arnd Bergmann (26):
> compat_ioctl: pppoe: fix PPPOEIOCSFWD handling
> compat_ioctl: move simple ppp command handling into driver
> compat_ioctl: avoid unused function warning for do_ioctl
> compat_ioctl: move PPPIOCSCOMPRESS32 to ppp-generic.c
> compat_ioctl: move PPPIOCSPASS32/PPPIOCSACTIVE32 to ppp_generic.c
> compat_ioctl: handle PPPIOCGIDLE for 64-bit time_t
> compat_ioctl: move rtc handling into rtc-dev.c
> compat_ioctl: add compat_ptr_ioctl()
> compat_ioctl: move drivers to compat_ptr_ioctl
> compat_ioctl: use correct compat_ptr() translation in drivers
> ceph: fix compat_ioctl for ceph_dir_operations
> compat_ioctl: move more drivers to compat_ptr_ioctl
> compat_ioctl: move tape handling into drivers
> compat_ioctl: move ATYFB_CLK handling to atyfb driver
> compat_ioctl: move isdn/capi ioctl translation into driver
> compat_ioctl: move rfcomm handlers into driver
> compat_ioctl: move hci_sock handlers into driver
> compat_ioctl: remove HCIUART handling
> compat_ioctl: remove HIDIO translation
> compat_ioctl: remove translation for sound ioctls
> compat_ioctl: remove IGNORE_IOCTL()
> compat_ioctl: remove /dev/random commands
> compat_ioctl: remove joystick ioctl translation
> compat_ioctl: remove PCI ioctl translation
> compat_ioctl: remove /dev/raw ioctl translation
> compat_ioctl: remove last RAID handling code
>
> Documentation/networking/ppp_generic.txt | 2 +
> arch/um/drivers/hostaudio_kern.c | 1 +
> drivers/android/binder.c | 2 +-
> drivers/char/ppdev.c | 12 +-
> drivers/char/random.c | 1 +
> drivers/char/tpm/tpm_vtpm_proxy.c | 12 +-
> drivers/crypto/qat/qat_common/adf_ctl_drv.c | 2 +-
> drivers/dma-buf/dma-buf.c | 4 +-
> drivers/dma-buf/sw_sync.c | 2 +-
> drivers/dma-buf/sync_file.c | 2 +-
> drivers/firewire/core-cdev.c | 12 +-
> drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 2 +-
> drivers/hid/hidraw.c | 4 +-
> drivers/hid/usbhid/hiddev.c | 11 +-
> drivers/hwtracing/stm/core.c | 12 +-
> drivers/ide/ide-tape.c | 31 +-
> drivers/iio/industrialio-core.c | 2 +-
> drivers/infiniband/core/uverbs_main.c | 4 +-
> drivers/isdn/capi/capi.c | 31 +
> drivers/isdn/i4l/isdn_ppp.c | 14 +-
> drivers/media/rc/lirc_dev.c | 4 +-
> drivers/mfd/cros_ec_dev.c | 4 +-
> drivers/misc/cxl/flash.c | 8 +-
> drivers/misc/genwqe/card_dev.c | 23 +-
> drivers/misc/mei/main.c | 22 +-
> drivers/misc/vmw_vmci/vmci_host.c | 2 +-
> drivers/mtd/ubi/cdev.c | 36 +-
> drivers/net/ppp/ppp_generic.c | 99 +++-
> drivers/net/ppp/pppoe.c | 7 +
> drivers/net/ppp/pptp.c | 3 +
> drivers/net/tap.c | 12 +-
> drivers/nvdimm/bus.c | 4 +-
> drivers/nvme/host/core.c | 2 +-
> drivers/pci/switch/switchtec.c | 2 +-
> drivers/platform/x86/wmi.c | 2 +-
> drivers/rpmsg/rpmsg_char.c | 4 +-
> drivers/rtc/dev.c | 13 +-
> drivers/rtc/rtc-vr41xx.c | 10 +
> drivers/s390/char/tape_char.c | 41 +-
> drivers/sbus/char/display7seg.c | 2 +-
> drivers/sbus/char/envctrl.c | 4 +-
> drivers/scsi/3w-xxxx.c | 4 +-
> drivers/scsi/cxlflash/main.c | 2 +-
> drivers/scsi/esas2r/esas2r_main.c | 2 +-
> drivers/scsi/megaraid/megaraid_mm.c | 28 +-
> drivers/scsi/osst.c | 34 +-
> drivers/scsi/pmcraid.c | 4 +-
> drivers/scsi/st.c | 35 +-
> drivers/staging/android/ion/ion.c | 4 +-
> drivers/staging/pi433/pi433_if.c | 12 +-
> drivers/staging/vme/devices/vme_user.c | 2 +-
> drivers/tee/tee_core.c | 2 +-
> drivers/usb/class/cdc-wdm.c | 2 +-
> drivers/usb/class/usbtmc.c | 4 +-
> drivers/usb/core/devio.c | 16 +-
> drivers/usb/gadget/function/f_fs.c | 12 +-
> drivers/vfio/vfio.c | 39 +-
> drivers/vhost/net.c | 12 +-
> drivers/vhost/scsi.c | 12 +-
> drivers/vhost/test.c | 12 +-
> drivers/vhost/vsock.c | 12 +-
> drivers/video/fbdev/aty/atyfb_base.c | 12 +-
> drivers/virt/fsl_hypervisor.c | 2 +-
> fs/btrfs/super.c | 2 +-
> fs/ceph/dir.c | 1 +
> fs/ceph/file.c | 2 +-
> fs/compat_ioctl.c | 602 +-------------------
> fs/fat/file.c | 13 +-
> fs/fuse/dev.c | 2 +-
> fs/notify/fanotify/fanotify_user.c | 2 +-
> fs/userfaultfd.c | 2 +-
> include/linux/fs.h | 7 +
> include/linux/if_pppox.h | 2 +
> include/linux/mtio.h | 58 ++
> include/uapi/linux/ppp-ioctl.h | 2 +
> include/uapi/linux/ppp_defs.h | 14 +
> net/bluetooth/hci_sock.c | 21 +-
> net/bluetooth/rfcomm/sock.c | 14 +-
> net/l2tp/l2tp_ppp.c | 3 +
> net/rfkill/core.c | 2 +-
> sound/core/oss/pcm_oss.c | 4 +
> sound/oss/dmasound/dmasound_core.c | 2 +
> 82 files changed, 452 insertions(+), 1034 deletions(-)
> create mode 100644 include/linux/mtio.h
>

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