[media] uvcvideo: Implement compat_ioctl32 for custom ioctls
Support 32-bit/64-bit compatibility for the the UVCIOC_ ioctls. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart
Mauro Carvalho Chehab
Родитель
a3ec69b707
Коммит
1a5e4c867c
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@ -11,6 +11,7 @@
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*
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*/
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#include <linux/compat.h>
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#include <linux/kernel.h>
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#include <linux/version.h>
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#include <linux/list.h>
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@ -1030,6 +1031,207 @@ static long uvc_v4l2_ioctl(struct file *file,
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return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
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}
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#ifdef CONFIG_COMPAT
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struct uvc_xu_control_mapping32 {
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__u32 id;
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__u8 name[32];
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__u8 entity[16];
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__u8 selector;
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__u8 size;
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__u8 offset;
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__u32 v4l2_type;
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__u32 data_type;
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compat_caddr_t menu_info;
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__u32 menu_count;
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__u32 reserved[4];
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};
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static int uvc_v4l2_get_xu_mapping(struct uvc_xu_control_mapping *kp,
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const struct uvc_xu_control_mapping32 __user *up)
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{
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struct uvc_menu_info __user *umenus;
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struct uvc_menu_info __user *kmenus;
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compat_caddr_t p;
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if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
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__copy_from_user(kp, up, offsetof(typeof(*up), menu_info)) ||
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__get_user(kp->menu_count, &up->menu_count))
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return -EFAULT;
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memset(kp->reserved, 0, sizeof(kp->reserved));
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if (kp->menu_count == 0) {
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kp->menu_info = NULL;
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return 0;
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}
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if (__get_user(p, &up->menu_info))
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return -EFAULT;
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umenus = compat_ptr(p);
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if (!access_ok(VERIFY_READ, umenus, kp->menu_count * sizeof(*umenus)))
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return -EFAULT;
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kmenus = compat_alloc_user_space(kp->menu_count * sizeof(*kmenus));
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if (kmenus == NULL)
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return -EFAULT;
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kp->menu_info = kmenus;
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if (copy_in_user(kmenus, umenus, kp->menu_count * sizeof(*umenus)))
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return -EFAULT;
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return 0;
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}
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static int uvc_v4l2_put_xu_mapping(const struct uvc_xu_control_mapping *kp,
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struct uvc_xu_control_mapping32 __user *up)
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{
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struct uvc_menu_info __user *umenus;
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struct uvc_menu_info __user *kmenus = kp->menu_info;
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compat_caddr_t p;
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if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
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__copy_to_user(up, kp, offsetof(typeof(*up), menu_info)) ||
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__put_user(kp->menu_count, &up->menu_count))
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return -EFAULT;
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__clear_user(up->reserved, sizeof(up->reserved));
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if (kp->menu_count == 0)
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return 0;
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if (get_user(p, &up->menu_info))
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return -EFAULT;
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umenus = compat_ptr(p);
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if (!access_ok(VERIFY_WRITE, umenus, kp->menu_count * sizeof(*umenus)))
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return -EFAULT;
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if (copy_in_user(umenus, kmenus, kp->menu_count * sizeof(*umenus)))
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return -EFAULT;
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return 0;
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}
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struct uvc_xu_control_query32 {
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__u8 unit;
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__u8 selector;
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__u8 query;
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__u16 size;
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compat_caddr_t data;
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};
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static int uvc_v4l2_get_xu_query(struct uvc_xu_control_query *kp,
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const struct uvc_xu_control_query32 __user *up)
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{
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u8 __user *udata;
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u8 __user *kdata;
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compat_caddr_t p;
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if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
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__copy_from_user(kp, up, offsetof(typeof(*up), data)))
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return -EFAULT;
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if (kp->size == 0) {
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kp->data = NULL;
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return 0;
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}
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if (__get_user(p, &up->data))
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return -EFAULT;
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udata = compat_ptr(p);
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if (!access_ok(VERIFY_READ, udata, kp->size))
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return -EFAULT;
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kdata = compat_alloc_user_space(kp->size);
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if (kdata == NULL)
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return -EFAULT;
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kp->data = kdata;
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if (copy_in_user(kdata, udata, kp->size))
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return -EFAULT;
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return 0;
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}
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static int uvc_v4l2_put_xu_query(const struct uvc_xu_control_query *kp,
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struct uvc_xu_control_query32 __user *up)
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{
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u8 __user *udata;
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u8 __user *kdata = kp->data;
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compat_caddr_t p;
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if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
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__copy_to_user(up, kp, offsetof(typeof(*up), data)))
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return -EFAULT;
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if (kp->size == 0)
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return 0;
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if (get_user(p, &up->data))
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return -EFAULT;
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udata = compat_ptr(p);
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if (!access_ok(VERIFY_READ, udata, kp->size))
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return -EFAULT;
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if (copy_in_user(udata, kdata, kp->size))
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return -EFAULT;
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return 0;
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}
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#define UVCIOC_CTRL_MAP32 _IOWR('u', 0x20, struct uvc_xu_control_mapping32)
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#define UVCIOC_CTRL_QUERY32 _IOWR('u', 0x21, struct uvc_xu_control_query32)
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static long uvc_v4l2_compat_ioctl32(struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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union {
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struct uvc_xu_control_mapping xmap;
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struct uvc_xu_control_query xqry;
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} karg;
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void __user *up = compat_ptr(arg);
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mm_segment_t old_fs;
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long ret;
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switch (cmd) {
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case UVCIOC_CTRL_MAP32:
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cmd = UVCIOC_CTRL_MAP;
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ret = uvc_v4l2_get_xu_mapping(&karg.xmap, up);
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break;
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case UVCIOC_CTRL_QUERY32:
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cmd = UVCIOC_CTRL_QUERY;
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ret = uvc_v4l2_get_xu_query(&karg.xqry, up);
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break;
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default:
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return -ENOIOCTLCMD;
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}
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old_fs = get_fs();
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set_fs(KERNEL_DS);
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ret = uvc_v4l2_ioctl(file, cmd, (unsigned long)&karg);
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set_fs(old_fs);
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if (ret < 0)
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return ret;
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switch (cmd) {
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case UVCIOC_CTRL_MAP:
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ret = uvc_v4l2_put_xu_mapping(&karg.xmap, up);
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break;
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case UVCIOC_CTRL_QUERY:
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ret = uvc_v4l2_put_xu_query(&karg.xqry, up);
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break;
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}
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return ret;
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}
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#endif
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static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
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size_t count, loff_t *ppos)
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{
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@ -1076,6 +1278,9 @@ const struct v4l2_file_operations uvc_fops = {
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.open = uvc_v4l2_open,
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.release = uvc_v4l2_release,
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.unlocked_ioctl = uvc_v4l2_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl32 = uvc_v4l2_compat_ioctl32,
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#endif
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.read = uvc_v4l2_read,
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.mmap = uvc_v4l2_mmap,
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.poll = uvc_v4l2_poll,
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