1 files changed, 58 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0271-char-vcio-Add-compat-ioctl-handling.patch b/target/linux/brcm2708/patches-4.19/950-0271-char-vcio-Add-compat-ioctl-handling.patch
new file mode 100644
index 0000000000..a9b55722e5
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0271-char-vcio-Add-compat-ioctl-handling.patch
@@ -0,0 +1,58 @@
+From 70194b474d22974cd46356e5b3d3b0582abd02da Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.org>
+Date: Thu, 24 Jan 2019 13:56:30 +0000
+Subject: [PATCH] char: vcio: Add compat ioctl handling
+
+There was no compat ioctl handler, so 32 bit userspace on a
+64 bit kernel failed as IOCTL_MBOX_PROPERTY used the size
+of char*.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
+---
+ drivers/char/broadcom/vcio.c | 22 +++++++++++++++++++++-
+ 1 file changed, 21 insertions(+), 1 deletion(-)
+
+--- a/drivers/char/broadcom/vcio.c
++++ b/drivers/char/broadcom/vcio.c
+@@ -24,6 +24,9 @@
+ 
+ #define VCIO_IOC_MAGIC 100
+ #define IOCTL_MBOX_PROPERTY _IOWR(VCIO_IOC_MAGIC, 0, char *)
++#ifdef CONFIG_COMPAT
++#define IOCTL_MBOX_PROPERTY32 _IOWR(VCIO_IOC_MAGIC, 0, compat_uptr_t)
++#endif
+ 
+ static struct {
+ 	dev_t devt;
+@@ -87,13 +90,30 @@ static long vcio_device_ioctl(struct fil
+ 	case IOCTL_MBOX_PROPERTY:
+ 		return vcio_user_property_list((void *)ioctl_param);
+ 	default:
+-		pr_err("unknown ioctl: %d\n", ioctl_num);
++		pr_err("unknown ioctl: %x\n", ioctl_num);
+ 		return -EINVAL;
+ 	}
+ }
+ 
++#ifdef CONFIG_COMPAT
++static long vcio_device_compat_ioctl(struct file *file, unsigned int ioctl_num,
++				     unsigned long ioctl_param)
++{
++	switch (ioctl_num) {
++	case IOCTL_MBOX_PROPERTY32:
++		return vcio_user_property_list(compat_ptr(ioctl_param));
++	default:
++		pr_err("unknown ioctl: %x\n", ioctl_num);
++		return -EINVAL;
++	}
++}
++#endif
++
+ const struct file_operations vcio_fops = {
+ 	.unlocked_ioctl = vcio_device_ioctl,
++#ifdef CONFIG_COMPAT
++	.compat_ioctl = vcio_device_compat_ioctl,
++#endif
+ 	.open = vcio_device_open,
+ 	.release = vcio_device_release,
+ };