Messages in this thread Patch in this message | | | From | Steffen Maier <> | Subject | [PATCH] compat_ioctl: fix reimplemented SG_IO handling causing -EINVAL from sg_io() | Date | Wed, 18 Sep 2019 17:34:45 +0200 |
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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 <maier@linux.ibm.com> Fixes: 4f45155c29fd ("compat_ioctl: reimplement SG_IO handling") ---
Arnd, I'm not sure about the sizeof(hdr32) change in the compat part in put_sg_io_hdr().
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; } #endif - 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) } #endif - if (copy_from_user(&hdr, argp, sizeof(hdr))) + if (copy_from_user(hdr, argp, sizeof(*hdr))) return -EFAULT; return 0; -- 2.17.1
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