[PATCH 1/8] nitro_enclaves: Let 32-bit processes use the ioctl interface

[Alexander Graf]

Neither the misc device nor an enclave fd sets .compat_ioctl, so every
NE ioctl answers -ENOTTY to a 32-bit process on a 64-bit kernel. Nothing
about the interface asks for that. Each ioctl argument is a fixed-width
type or a struct built out of fixed-width types, laid out the same
either way, and the one thing that does differ between a 32-bit and a
64-bit caller is the argument pointer, which is what compat_ptr_ioctl()
converts.

So point both file_operations at it. A 32-bit program that drives
enclaves works with no translation layer on either side, and the ioctl
added later in this series is reachable from such a program the day it
lands, instead of waiting for somebody to notice that it is not.

Fixes: 38907e124088 ("nitro_enclaves: Add logic for creating an enclave VM")
Assisted-by: Kiro:claude-opus-5
Signed-off-by: Alexander Graf <graf@xxxxxxxxxx>
---
 drivers/virt/nitro_enclaves/ne_misc_dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.c b/drivers/virt/nitro_enclaves/ne_misc_dev.c
index c91300a73f50..8222fbe75800 100644
--- a/drivers/virt/nitro_enclaves/ne_misc_dev.c
+++ b/drivers/virt/nitro_enclaves/ne_misc_dev.c
@@ -67,6 +67,7 @@ static const struct file_operations ne_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= noop_llseek,
 	.unlocked_ioctl	= ne_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
 
 static struct miscdevice ne_misc_dev = {
@@ -1569,6 +1570,7 @@ static const struct file_operations ne_enclave_fops = {
 	.llseek		= noop_llseek,
 	.poll		= ne_enclave_poll,
 	.unlocked_ioctl	= ne_enclave_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 	.release	= ne_enclave_release,
 };
 
-- 
2.47.1