btw, I mentioned on irc, but someone *really* ought to go through the
ioclt structs and split each struct member into it's own line, so
things like '__u32 width, height' aren't so sneaky ;-)
On Mon, Jul 13, 2015 at 11:56 AM, Tvrtko Ursulin
<tvrtko.ursulin@xxxxxxxxxxxxxxx> wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
>
> Frame buffer modifiers extensions provided in;
>
> commit e3eb3250d84ef97b766312345774367b6a310db8
> Author: Rob Clark <robdclark@xxxxxxxxx>
> Date: Thu Feb 5 14:41:52 2015 +0000
>
> drm: add support for tiled/compressed/etc modifier in addfb2
>
> Missed the structure packing/alignment problem where 64-bit
> members were added after the odd number of 32-bit ones. This
> makes the compiler produce structures of different sizes under
> 32- and 64-bit x86 targets and makes the ioctl need explicit
> compat handling.
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Rob Clark <robdclark@xxxxxxxxx>
> Cc: Daniel Stone <daniels@xxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_ioc32.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 60 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_ioc32.c b/drivers/gpu/drm/drm_ioc32.c
> index aa8bbb460c57..2bea11bfb3ae 100644
> --- a/drivers/gpu/drm/drm_ioc32.c
> +++ b/drivers/gpu/drm/drm_ioc32.c
> @@ -70,6 +70,8 @@
>
> #define DRM_IOCTL_WAIT_VBLANK32 DRM_IOWR(0x3a, drm_wait_vblank32_t)
>
> +#define DRM_IOCTL_MODE_ADDFB232 DRM_IOWR(0xb8, drm_mode_fb_cmd232_t)
> +
> typedef struct drm_version_32 {
> int version_major; /**< Major version */
> int version_minor; /**< Minor version */
> @@ -1016,6 +1018,63 @@ static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,
> return 0;
> }
>
> +typedef struct drm_mode_fb_cmd232 {
> + u32 fb_id;
> + u32 width;
> + u32 height;
> + u32 pixel_format;
> + u32 flags;
> + u32 handles[4];
> + u32 pitches[4];
> + u32 offsets[4];
> + u64 modifier[4];
> +} __attribute__((packed)) drm_mode_fb_cmd232_t;
> +
> +static int compat_drm_mode_addfb2(struct file *file, unsigned int cmd,
> + unsigned long arg)
> +{
> + drm_mode_fb_cmd232_t __user *argp = (void __user *)arg;
> + struct drm_mode_fb_cmd232 req32;
> + struct drm_mode_fb_cmd2 __user *req64;
> + int i;
> + int err;
> +
> + if (copy_from_user(&req32, argp, sizeof(req32)))
> + return -EFAULT;
> +
> + req64 = compat_alloc_user_space(sizeof(*req64));
> +
> + if (!access_ok(VERIFY_WRITE, req64, sizeof(*req64))
> + || __put_user(req32.width, &req64->width)
> + || __put_user(req32.height, &req64->height)
> + || __put_user(req32.pixel_format, &req64->pixel_format)
> + || __put_user(req32.flags, &req64->flags))
> + return -EFAULT;
> +
> + for (i = 0; i < 4; i++) {
> + if (__put_user(req32.handles[i], &req64->handles[i]))
> + return -EFAULT;
> + if (__put_user(req32.pitches[i], &req64->pitches[i]))
> + return -EFAULT;
> + if (__put_user(req32.offsets[i], &req64->offsets[i]))
> + return -EFAULT;
> + if (__put_user(req32.modifier[i], &req64->modifier[i]))
> + return -EFAULT;
> + }
> +
> + err = drm_ioctl(file, DRM_IOCTL_MODE_ADDFB2, (unsigned long)req64);
> + if (err)
> + return err;
> +
> + if (__get_user(req32.fb_id, &req64->fb_id))
> + return -EFAULT;
> +
> + if (copy_to_user(argp, &req32, sizeof(req32)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> static drm_ioctl_compat_t *drm_compat_ioctls[] = {
> [DRM_IOCTL_NR(DRM_IOCTL_VERSION32)] = compat_drm_version,
> [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE32)] = compat_drm_getunique,
> @@ -1048,6 +1107,7 @@ static drm_ioctl_compat_t *drm_compat_ioctls[] = {
> [DRM_IOCTL_NR(DRM_IOCTL_UPDATE_DRAW32)] = compat_drm_update_draw,
> #endif
> [DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK32)] = compat_drm_wait_vblank,
> + [DRM_IOCTL_NR(DRM_IOCTL_MODE_ADDFB232)] = compat_drm_mode_addfb2,
> };
>
> /**
> --
> 2.4.2
>
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