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* [PATCH] compat_ioctl: fix reimplemented SG_IO handling causing -EINVAL from sg_io()
@ 2019-09-18 15:34 Steffen Maier
  2019-10-09 16:01 ` Arnd Bergmann
  0 siblings, 1 reply; 2+ messages in thread
From: Steffen Maier @ 2019-09-18 15:34 UTC (permalink / raw)
  To: Arnd Bergmann, James E . J . Bottomley, Martin K . Petersen,
	Doug Gilbert
  Cc: linux-scsi, linux-s390, Benjamin Block, Heiko Carstens,
	Vasily Gorbik, Steffen Maier, linux-kernel, Jens Axboe, viro,
	linux-fsdevel, Chaitanya Kulkarni, Thomas Gleixner,
	Mauro Carvalho Chehab, Omar Sandoval, linux-block, linux-next,
	Mark Brown, dm-devel

scsi_cmd_ioctl() had hdr as on stack auto variable and called
copy_{from,to}_user with the address operator &hdr and sizeof(hdr).

After the refactoring, {get,put}_sg_io_hdr() takes a pointer &hdr.
So the copy_{from,to}_user within the new helper functions should
just take the given pointer argument hdr and sizeof(*hdr).

I saw -EINVAL from sg_io() done by /usr/lib/udev/scsi_id which could
in turn no longer whitelist SCSI disks for devicemapper multipath.

Signed-off-by: Steffen Maier <>
Fixes: 4f45155c29fd ("compat_ioctl: reimplement SG_IO handling")

Arnd, I'm not sure about the sizeof(hdr32) change in the compat part in

This is for next, probably via Arnd's y2038/y2038,
and it fixes next-20190917 for me regarding SCSI generic.

 block/scsi_ioctl.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index cbeb629ee917..650bade5ea5a 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -607,14 +607,14 @@ int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
 			.info		 = hdr->info,
-		if (copy_to_user(argp, &hdr32, sizeof(hdr)))
+		if (copy_to_user(argp, &hdr32, sizeof(hdr32)))
 			return -EFAULT;
 		return 0;
-	if (copy_to_user(argp, &hdr, sizeof(hdr)))
+	if (copy_to_user(argp, hdr, sizeof(*hdr)))
 		return -EFAULT;
 	return 0;
@@ -659,7 +659,7 @@ int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
-	if (copy_from_user(&hdr, argp, sizeof(hdr)))
+	if (copy_from_user(hdr, argp, sizeof(*hdr)))
 		return -EFAULT;
 	return 0;

^ permalink raw reply related	[flat|nested] 2+ messages in thread

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2019-09-18 15:34 [PATCH] compat_ioctl: fix reimplemented SG_IO handling causing -EINVAL from sg_io() Steffen Maier
2019-10-09 16:01 ` Arnd Bergmann

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