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linux/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
Mauro Carvalho Chehab 1d338b86e1 media: v4l2-compat-ioctl32: better document the code 
This file does a lot of non-trivial struff. Document it using
kernel-doc markups where needed and improve the comments inside
do_video_ioctl().

Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2018-04-20 08:24:13 -04:00

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/*
* ioctl32.c: Conversion between 32bit and 64bit native ioctls.
* Separated from fs stuff by Arnd Bergmann <arnd@arndb.de>
*
* Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
* Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
* Copyright (C) 2005 Philippe De Muyter (phdm@macqel.be)
* Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
*
* These routines maintain argument size conversion between 32bit and 64bit
* ioctls.
*/
#include <linux/compat.h>
#include <linux/module.h>
#include <linux/videodev2.h>
#include <linux/v4l2-subdev.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-ioctl.h>
/**
* assign_in_user() - Copy from one __user var to another one
*
* @to: __user var where data will be stored
* @from: __user var where data will be retrieved.
*
* As this code very often needs to allocate userspace memory, it is easier
* to have a macro that will do both get_user() and put_user() at once.
*
* This function complements the macros defined at asm-generic/uaccess.h.
* It uses the same argument order as copy_in_user()
*/
#define assign_in_user(to, from) \
({ \
typeof(*from) __assign_tmp; \
\
get_user(__assign_tmp, from) || put_user(__assign_tmp, to); \
})
/**
* get_user_cast() - Stores at a kernelspace local var the contents from a
* pointer with userspace data that is not tagged with __user.
*
* @__x: var where data will be stored
* @__ptr: var where data will be retrieved.
*
* Sometimes we need to declare a pointer without __user because it
* comes from a pointer struct field that will be retrieved from userspace
* by the 64-bit native ioctl handler. This function ensures that the
* @__ptr will be cast to __user before calling get_user() in order to
* avoid warnings with static code analyzers like smatch.
*/
#define get_user_cast(__x, __ptr) \
({ \
get_user(__x, (typeof(*__ptr) __user *)(__ptr)); \
})
/**
* put_user_force() - Stores the contents of a kernelspace local var
* into a userspace pointer, removing any __user cast.
*
* @__x: var where data will be stored
* @__ptr: var where data will be retrieved.
*
* Sometimes we need to remove the __user attribute from some data,
* by passing the __force macro. This function ensures that the
* @__ptr will be cast with __force before calling put_user(), in order to
* avoid warnings with static code analyzers like smatch.
*/
#define put_user_force(__x, __ptr) \
({ \
put_user((typeof(*__x) __force *)(__x), __ptr); \
})
/**
* assign_in_user_cast() - Copy from one __user var to another one
*
* @to: __user var where data will be stored
* @from: var where data will be retrieved that needs to be cast to __user.
*
* As this code very often needs to allocate userspace memory, it is easier
* to have a macro that will do both get_user_cast() and put_user() at once.
*
* This function should be used instead of assign_in_user() when the @from
* variable was not declared as __user. See get_user_cast() for more details.
*
* This function complements the macros defined at asm-generic/uaccess.h.
* It uses the same argument order as copy_in_user()
*/
#define assign_in_user_cast(to, from) \
({ \
typeof(*from) __assign_tmp; \
\
get_user_cast(__assign_tmp, from) || put_user(__assign_tmp, to);\
})
/**
* native_ioctl - Ancillary function that calls the native 64 bits ioctl
* handler.
*
* @file: pointer to &struct file with the file handler
* @cmd: ioctl to be called
* @arg: arguments passed from/to the ioctl handler
*
* This function calls the native ioctl handler at v4l2-dev, e. g. v4l2_ioctl()
*/
static long native_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret = -ENOIOCTLCMD;
if (file->f_op->unlocked_ioctl)
ret = file->f_op->unlocked_ioctl(file, cmd, arg);
return ret;
}
/*
* Per-ioctl data copy handlers.
*
* Those come in pairs, with a get_v4l2_foo() and a put_v4l2_foo() routine,
* where "v4l2_foo" is the name of the V4L2 struct.
*
* They basically get two __user pointers, one with a 32-bits struct that
* came from the userspace call and a 64-bits struct, also allocated as
* userspace, but filled internally by do_video_ioctl().
*
* For ioctls that have pointers inside it, the functions will also
* receive an ancillary buffer with extra space, used to pass extra
* data to the routine.
*/
struct v4l2_clip32 {
struct v4l2_rect c;
compat_caddr_t next;
};
struct v4l2_window32 {
struct v4l2_rect w;
__u32 field; /* enum v4l2_field */
__u32 chromakey;
compat_caddr_t clips; /* actually struct v4l2_clip32 * */
__u32 clipcount;
compat_caddr_t bitmap;
__u8 global_alpha;
};
static int get_v4l2_window32(struct v4l2_window __user *p64,
struct v4l2_window32 __user *p32,
void __user *aux_buf, u32 aux_space)
{
struct v4l2_clip32 __user *uclips;
struct v4l2_clip __user *kclips;
compat_caddr_t p;
u32 clipcount;
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
copy_in_user(&p64->w, &p32->w, sizeof(p32->w)) ||
assign_in_user(&p64->field, &p32->field) ||
assign_in_user(&p64->chromakey, &p32->chromakey) ||
assign_in_user(&p64->global_alpha, &p32->global_alpha) ||
get_user(clipcount, &p32->clipcount) ||
put_user(clipcount, &p64->clipcount))
return -EFAULT;
if (clipcount > 2048)
return -EINVAL;
if (!clipcount)
return put_user(NULL, &p64->clips);
if (get_user(p, &p32->clips))
return -EFAULT;
uclips = compat_ptr(p);
if (aux_space < clipcount * sizeof(*kclips))
return -EFAULT;
kclips = aux_buf;
if (put_user(kclips, &p64->clips))
return -EFAULT;
while (clipcount--) {
if (copy_in_user(&kclips->c, &uclips->c, sizeof(uclips->c)))
return -EFAULT;
if (put_user(clipcount ? kclips + 1 : NULL, &kclips->next))
return -EFAULT;
uclips++;
kclips++;
}
return 0;
}
static int put_v4l2_window32(struct v4l2_window __user *p64,
struct v4l2_window32 __user *p32)
{
struct v4l2_clip __user *kclips;
struct v4l2_clip32 __user *uclips;
compat_caddr_t p;
u32 clipcount;
if (copy_in_user(&p32->w, &p64->w, sizeof(p64->w)) ||
assign_in_user(&p32->field, &p64->field) ||
assign_in_user(&p32->chromakey, &p64->chromakey) ||
assign_in_user(&p32->global_alpha, &p64->global_alpha) ||
get_user(clipcount, &p64->clipcount) ||
put_user(clipcount, &p32->clipcount))
return -EFAULT;
if (!clipcount)
return 0;
if (get_user(kclips, &p64->clips))
return -EFAULT;
if (get_user(p, &p32->clips))
return -EFAULT;
uclips = compat_ptr(p);
while (clipcount--) {
if (copy_in_user(&uclips->c, &kclips->c, sizeof(uclips->c)))
return -EFAULT;
uclips++;
kclips++;
}
return 0;
}
struct v4l2_format32 {
__u32 type; /* enum v4l2_buf_type */
union {
struct v4l2_pix_format pix;
struct v4l2_pix_format_mplane pix_mp;
struct v4l2_window32 win;
struct v4l2_vbi_format vbi;
struct v4l2_sliced_vbi_format sliced;
struct v4l2_sdr_format sdr;
struct v4l2_meta_format meta;
__u8 raw_data[200]; /* user-defined */
} fmt;
};
/**
* struct v4l2_create_buffers32 - VIDIOC_CREATE_BUFS32 argument
* @index: on return, index of the first created buffer
* @count: entry: number of requested buffers,
* return: number of created buffers
* @memory: buffer memory type
* @format: frame format, for which buffers are requested
* @reserved: future extensions
*/
struct v4l2_create_buffers32 {
__u32 index;
__u32 count;
__u32 memory; /* enum v4l2_memory */
struct v4l2_format32 format;
__u32 reserved[8];
};
static int __bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size)
{
u32 type;
if (get_user(type, &p32->type))
return -EFAULT;
switch (type) {
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: {
u32 clipcount;
if (get_user(clipcount, &p32->fmt.win.clipcount))
return -EFAULT;
if (clipcount > 2048)
return -EINVAL;
*size = clipcount * sizeof(struct v4l2_clip);
return 0;
}
default:
*size = 0;
return 0;
}
}
static int bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size)
{
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)))
return -EFAULT;
return __bufsize_v4l2_format(p32, size);
}
static int __get_v4l2_format32(struct v4l2_format __user *p64,
struct v4l2_format32 __user *p32,
void __user *aux_buf, u32 aux_space)
{
u32 type;
if (get_user(type, &p32->type) || put_user(type, &p64->type))
return -EFAULT;
switch (type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
return copy_in_user(&p64->fmt.pix, &p32->fmt.pix,
sizeof(p64->fmt.pix)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
return copy_in_user(&p64->fmt.pix_mp, &p32->fmt.pix_mp,
sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
return get_v4l2_window32(&p64->fmt.win, &p32->fmt.win,
aux_buf, aux_space);
case V4L2_BUF_TYPE_VBI_CAPTURE:
case V4L2_BUF_TYPE_VBI_OUTPUT:
return copy_in_user(&p64->fmt.vbi, &p32->fmt.vbi,
sizeof(p64->fmt.vbi)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
return copy_in_user(&p64->fmt.sliced, &p32->fmt.sliced,
sizeof(p64->fmt.sliced)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_SDR_CAPTURE:
case V4L2_BUF_TYPE_SDR_OUTPUT:
return copy_in_user(&p64->fmt.sdr, &p32->fmt.sdr,
sizeof(p64->fmt.sdr)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_META_CAPTURE:
return copy_in_user(&p64->fmt.meta, &p32->fmt.meta,
sizeof(p64->fmt.meta)) ? -EFAULT : 0;
default:
return -EINVAL;
}
}
static int get_v4l2_format32(struct v4l2_format __user *p64,
struct v4l2_format32 __user *p32,
void __user *aux_buf, u32 aux_space)
{
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)))
return -EFAULT;
return __get_v4l2_format32(p64, p32, aux_buf, aux_space);
}
static int bufsize_v4l2_create(struct v4l2_create_buffers32 __user *p32,
u32 *size)
{
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)))
return -EFAULT;
return __bufsize_v4l2_format(&p32->format, size);
}
static int get_v4l2_create32(struct v4l2_create_buffers __user *p64,
struct v4l2_create_buffers32 __user *p32,
void __user *aux_buf, u32 aux_space)
{
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
copy_in_user(p64, p32,
offsetof(struct v4l2_create_buffers32, format)))
return -EFAULT;
return __get_v4l2_format32(&p64->format, &p32->format,
aux_buf, aux_space);
}
static int __put_v4l2_format32(struct v4l2_format __user *p64,
struct v4l2_format32 __user *p32)
{
u32 type;
if (get_user(type, &p64->type))
return -EFAULT;
switch (type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
return copy_in_user(&p32->fmt.pix, &p64->fmt.pix,
sizeof(p64->fmt.pix)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
return copy_in_user(&p32->fmt.pix_mp, &p64->fmt.pix_mp,
sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
return put_v4l2_window32(&p64->fmt.win, &p32->fmt.win);
case V4L2_BUF_TYPE_VBI_CAPTURE:
case V4L2_BUF_TYPE_VBI_OUTPUT:
return copy_in_user(&p32->fmt.vbi, &p64->fmt.vbi,
sizeof(p64->fmt.vbi)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
return copy_in_user(&p32->fmt.sliced, &p64->fmt.sliced,
sizeof(p64->fmt.sliced)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_SDR_CAPTURE:
case V4L2_BUF_TYPE_SDR_OUTPUT:
return copy_in_user(&p32->fmt.sdr, &p64->fmt.sdr,
sizeof(p64->fmt.sdr)) ? -EFAULT : 0;
case V4L2_BUF_TYPE_META_CAPTURE:
return copy_in_user(&p32->fmt.meta, &p64->fmt.meta,
sizeof(p64->fmt.meta)) ? -EFAULT : 0;
default:
return -EINVAL;
}
}
static int put_v4l2_format32(struct v4l2_format __user *p64,
struct v4l2_format32 __user *p32)
{
if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)))
return -EFAULT;
return __put_v4l2_format32(p64, p32);
}
static int put_v4l2_create32(struct v4l2_create_buffers __user *p64,
struct v4l2_create_buffers32 __user *p32)
{
if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
copy_in_user(p32, p64,
offsetof(struct v4l2_create_buffers32, format)) ||
copy_in_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
return -EFAULT;
return __put_v4l2_format32(&p64->format, &p32->format);
}
struct v4l2_standard32 {
__u32 index;
compat_u64 id;
__u8 name[24];
struct v4l2_fract frameperiod; /* Frames, not fields */
__u32 framelines;
__u32 reserved[4];
};
static int get_v4l2_standard32(struct v4l2_standard __user *p64,
struct v4l2_standard32 __user *p32)
{
/* other fields are not set by the user, nor used by the driver */
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
assign_in_user(&p64->index, &p32->index))
return -EFAULT;
return 0;
}
static int put_v4l2_standard32(struct v4l2_standard __user *p64,
struct v4l2_standard32 __user *p32)
{
if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
assign_in_user(&p32->index, &p64->index) ||
assign_in_user(&p32->id, &p64->id) ||
copy_in_user(p32->name, p64->name, sizeof(p32->name)) ||
copy_in_user(&p32->frameperiod, &p64->frameperiod,
sizeof(p32->frameperiod)) ||
assign_in_user(&p32->framelines, &p64->framelines) ||
copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
return -EFAULT;
return 0;
}
struct v4l2_plane32 {
__u32 bytesused;
__u32 length;
union {
__u32 mem_offset;
compat_long_t userptr;
__s32 fd;
} m;
__u32 data_offset;
__u32 reserved[11];
};
struct v4l2_buffer32 {
__u32 index;
__u32 type; /* enum v4l2_buf_type */
__u32 bytesused;
__u32 flags;
__u32 field; /* enum v4l2_field */
struct compat_timeval timestamp;
struct v4l2_timecode timecode;
__u32 sequence;
/* memory location */
__u32 memory; /* enum v4l2_memory */
union {
__u32 offset;
compat_long_t userptr;
compat_caddr_t planes;
__s32 fd;
} m;
__u32 length;
__u32 reserved2;
__u32 reserved;
};
static int get_v4l2_plane32(struct v4l2_plane __user *p64,
struct v4l2_plane32 __user *p32,
enum v4l2_memory memory)
{
compat_ulong_t p;
if (copy_in_user(p64, p32, 2 * sizeof(__u32)) ||
copy_in_user(&p64->data_offset, &p32->data_offset,
sizeof(p64->data_offset)))
return -EFAULT;
switch (memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
if (copy_in_user(&p64->m.mem_offset, &p32->m.mem_offset,
sizeof(p32->m.mem_offset)))
return -EFAULT;
break;
case V4L2_MEMORY_USERPTR:
if (get_user(p, &p32->m.userptr) ||
put_user((unsigned long)compat_ptr(p), &p64->m.userptr))
return -EFAULT;
break;
case V4L2_MEMORY_DMABUF:
if (copy_in_user(&p64->m.fd, &p32->m.fd, sizeof(p32->m.fd)))
return -EFAULT;
break;
}
return 0;
}
static int put_v4l2_plane32(struct v4l2_plane __user *p64,
struct v4l2_plane32 __user *p32,
enum v4l2_memory memory)
{
unsigned long p;
if (copy_in_user(p32, p64, 2 * sizeof(__u32)) ||
copy_in_user(&p32->data_offset, &p64->data_offset,
sizeof(p64->data_offset)))
return -EFAULT;
switch (memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
if (copy_in_user(&p32->m.mem_offset, &p64->m.mem_offset,
sizeof(p64->m.mem_offset)))
return -EFAULT;
break;
case V4L2_MEMORY_USERPTR:
if (get_user(p, &p64->m.userptr) ||
put_user((compat_ulong_t)ptr_to_compat((void __user *)p),
&p32->m.userptr))
return -EFAULT;
break;
case V4L2_MEMORY_DMABUF:
if (copy_in_user(&p32->m.fd, &p64->m.fd, sizeof(p64->m.fd)))
return -EFAULT;
break;
}
return 0;
}
static int bufsize_v4l2_buffer(struct v4l2_buffer32 __user *p32, u32 *size)
{
u32 type;
u32 length;
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
get_user(type, &p32->type) ||
get_user(length, &p32->length))
return -EFAULT;
if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
if (length > VIDEO_MAX_PLANES)
return -EINVAL;
/*
* We don't really care if userspace decides to kill itself
* by passing a very big length value
*/
*size = length * sizeof(struct v4l2_plane);
} else {
*size = 0;
}
return 0;
}
static int get_v4l2_buffer32(struct v4l2_buffer __user *p64,
struct v4l2_buffer32 __user *p32,
void __user *aux_buf, u32 aux_space)
{
u32 type;
u32 length;
enum v4l2_memory memory;
struct v4l2_plane32 __user *uplane32;
struct v4l2_plane __user *uplane;
compat_caddr_t p;
int ret;
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
assign_in_user(&p64->index, &p32->index) ||
get_user(type, &p32->type) ||
put_user(type, &p64->type) ||
assign_in_user(&p64->flags, &p32->flags) ||
get_user(memory, &p32->memory) ||
put_user(memory, &p64->memory) ||
get_user(length, &p32->length) ||
put_user(length, &p64->length))
return -EFAULT;
if (V4L2_TYPE_IS_OUTPUT(type))
if (assign_in_user(&p64->bytesused, &p32->bytesused) ||
assign_in_user(&p64->field, &p32->field) ||
assign_in_user(&p64->timestamp.tv_sec,
&p32->timestamp.tv_sec) ||
assign_in_user(&p64->timestamp.tv_usec,
&p32->timestamp.tv_usec))
return -EFAULT;
if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
u32 num_planes = length;
if (num_planes == 0) {
/*
* num_planes == 0 is legal, e.g. when userspace doesn't
* need planes array on DQBUF
*/
return put_user(NULL, &p64->m.planes);
}
if (num_planes > VIDEO_MAX_PLANES)
return -EINVAL;
if (get_user(p, &p32->m.planes))
return -EFAULT;
uplane32 = compat_ptr(p);
if (!access_ok(VERIFY_READ, uplane32,
num_planes * sizeof(*uplane32)))
return -EFAULT;
/*
* We don't really care if userspace decides to kill itself
* by passing a very big num_planes value
*/
if (aux_space < num_planes * sizeof(*uplane))
return -EFAULT;
uplane = aux_buf;
if (put_user_force(uplane, &p64->m.planes))
return -EFAULT;
while (num_planes--) {
ret = get_v4l2_plane32(uplane, uplane32, memory);
if (ret)
return ret;
uplane++;
uplane32++;
}
} else {
switch (memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
if (assign_in_user(&p64->m.offset, &p32->m.offset))
return -EFAULT;
break;
case V4L2_MEMORY_USERPTR: {
compat_ulong_t userptr;
if (get_user(userptr, &p32->m.userptr) ||
put_user((unsigned long)compat_ptr(userptr),
&p64->m.userptr))
return -EFAULT;
break;
}
case V4L2_MEMORY_DMABUF:
if (assign_in_user(&p64->m.fd, &p32->m.fd))
return -EFAULT;
break;
}
}
return 0;
}
static int put_v4l2_buffer32(struct v4l2_buffer __user *p64,
struct v4l2_buffer32 __user *p32)
{
u32 type;
u32 length;
enum v4l2_memory memory;
struct v4l2_plane32 __user *uplane32;
struct v4l2_plane *uplane;
compat_caddr_t p;
int ret;
if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
assign_in_user(&p32->index, &p64->index) ||
get_user(type, &p64->type) ||
put_user(type, &p32->type) ||
assign_in_user(&p32->flags, &p64->flags) ||
get_user(memory, &p64->memory) ||
put_user(memory, &p32->memory))
return -EFAULT;
if (assign_in_user(&p32->bytesused, &p64->bytesused) ||
assign_in_user(&p32->field, &p64->field) ||
assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) ||
assign_in_user(&p32->timestamp.tv_usec, &p64->timestamp.tv_usec) ||
copy_in_user(&p32->timecode, &p64->timecode, sizeof(p64->timecode)) ||
assign_in_user(&p32->sequence, &p64->sequence) ||
assign_in_user(&p32->reserved2, &p64->reserved2) ||
assign_in_user(&p32->reserved, &p64->reserved) ||
get_user(length, &p64->length) ||
put_user(length, &p32->length))
return -EFAULT;
if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
u32 num_planes = length;
if (num_planes == 0)
return 0;
/* We need to define uplane without __user, even though
* it does point to data in userspace here. The reason is
* that v4l2-ioctl.c copies it from userspace to kernelspace,
* so its definition in videodev2.h doesn't have a
* __user markup. Defining uplane with __user causes
* smatch warnings, so instead declare it without __user
* and cast it as a userspace pointer to put_v4l2_plane32().
*/
if (get_user(uplane, &p64->m.planes))
return -EFAULT;
if (get_user(p, &p32->m.planes))
return -EFAULT;
uplane32 = compat_ptr(p);
while (num_planes--) {
ret = put_v4l2_plane32((void __user *)uplane,
uplane32, memory);
if (ret)
return ret;
++uplane;
++uplane32;
}
} else {
switch (memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
if (assign_in_user(&p32->m.offset, &p64->m.offset))
return -EFAULT;
break;
case V4L2_MEMORY_USERPTR:
if (assign_in_user(&p32->m.userptr, &p64->m.userptr))
return -EFAULT;
break;
case V4L2_MEMORY_DMABUF:
if (assign_in_user(&p32->m.fd, &p64->m.fd))
return -EFAULT;
break;
}
}
return 0;
}
struct v4l2_framebuffer32 {
__u32 capability;
__u32 flags;
compat_caddr_t base;
struct {
__u32 width;
__u32 height;
__u32 pixelformat;
__u32 field;
__u32 bytesperline;
__u32 sizeimage;
__u32 colorspace;
__u32 priv;
} fmt;
};
static int get_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64,
struct v4l2_framebuffer32 __user *p32)
{
compat_caddr_t tmp;
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
get_user(tmp, &p32->base) ||
put_user_force(compat_ptr(tmp), &p64->base) ||
assign_in_user(&p64->capability, &p32->capability) ||
assign_in_user(&p64->flags, &p32->flags) ||
copy_in_user(&p64->fmt, &p32->fmt, sizeof(p64->fmt)))
return -EFAULT;
return 0;
}
static int put_v4l2_framebuffer32(struct v4l2_framebuffer __user *p64,
struct v4l2_framebuffer32 __user *p32)
{
void *base;
if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
get_user(base, &p64->base) ||
put_user(ptr_to_compat((void __user *)base), &p32->base) ||
assign_in_user(&p32->capability, &p64->capability) ||
assign_in_user(&p32->flags, &p64->flags) ||
copy_in_user(&p32->fmt, &p64->fmt, sizeof(p64->fmt)))
return -EFAULT;
return 0;
}
struct v4l2_input32 {
__u32 index; /* Which input */
__u8 name[32]; /* Label */
__u32 type; /* Type of input */
__u32 audioset; /* Associated audios (bitfield) */
__u32 tuner; /* Associated tuner */
compat_u64 std;
__u32 status;
__u32 capabilities;
__u32 reserved[3];
};
/*
* The 64-bit v4l2_input struct has extra padding at the end of the struct.
* Otherwise it is identical to the 32-bit version.
*/
static inline int get_v4l2_input32(struct v4l2_input __user *p64,
struct v4l2_input32 __user *p32)
{
if (copy_in_user(p64, p32, sizeof(*p32)))
return -EFAULT;
return 0;
}
static inline int put_v4l2_input32(struct v4l2_input __user *p64,
struct v4l2_input32 __user *p32)
{
if (copy_in_user(p32, p64, sizeof(*p32)))
return -EFAULT;
return 0;
}
struct v4l2_ext_controls32 {
__u32 which;
__u32 count;
__u32 error_idx;
__u32 reserved[2];
compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */
};
struct v4l2_ext_control32 {
__u32 id;
__u32 size;
__u32 reserved2[1];
union {
__s32 value;
__s64 value64;
compat_caddr_t string; /* actually char * */
};
} __attribute__ ((packed));
/* Return true if this control is a pointer type. */
static inline bool ctrl_is_pointer(struct file *file, u32 id)
{
struct video_device *vdev = video_devdata(file);
struct v4l2_fh *fh = NULL;
struct v4l2_ctrl_handler *hdl = NULL;
struct v4l2_query_ext_ctrl qec = { id };
const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;
if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags))
fh = file->private_data;
if (fh && fh->ctrl_handler)
hdl = fh->ctrl_handler;
else if (vdev->ctrl_handler)
hdl = vdev->ctrl_handler;
if (hdl) {
struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id);
return ctrl && ctrl->is_ptr;
}
if (!ops || !ops->vidioc_query_ext_ctrl)
return false;
return !ops->vidioc_query_ext_ctrl(file, fh, &qec) &&
(qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD);
}
static int bufsize_v4l2_ext_controls(struct v4l2_ext_controls32 __user *p32,
u32 *size)
{
u32 count;
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
get_user(count, &p32->count))
return -EFAULT;
if (count > V4L2_CID_MAX_CTRLS)
return -EINVAL;
*size = count * sizeof(struct v4l2_ext_control);
return 0;
}
static int get_v4l2_ext_controls32(struct file *file,
struct v4l2_ext_controls __user *p64,
struct v4l2_ext_controls32 __user *p32,
void __user *aux_buf, u32 aux_space)
{
struct v4l2_ext_control32 __user *ucontrols;
struct v4l2_ext_control __user *kcontrols;
u32 count;
u32 n;
compat_caddr_t p;
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
assign_in_user(&p64->which, &p32->which) ||
get_user(count, &p32->count) ||
put_user(count, &p64->count) ||
assign_in_user(&p64->error_idx, &p32->error_idx) ||
copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved)))
return -EFAULT;
if (count == 0)
return put_user(NULL, &p64->controls);
if (count > V4L2_CID_MAX_CTRLS)
return -EINVAL;
if (get_user(p, &p32->controls))
return -EFAULT;
ucontrols = compat_ptr(p);
if (!access_ok(VERIFY_READ, ucontrols, count * sizeof(*ucontrols)))
return -EFAULT;
if (aux_space < count * sizeof(*kcontrols))
return -EFAULT;
kcontrols = aux_buf;
if (put_user_force(kcontrols, &p64->controls))
return -EFAULT;
for (n = 0; n < count; n++) {
u32 id;
if (copy_in_user(kcontrols, ucontrols, sizeof(*ucontrols)))
return -EFAULT;
if (get_user(id, &kcontrols->id))
return -EFAULT;
if (ctrl_is_pointer(file, id)) {
void __user *s;
if (get_user(p, &ucontrols->string))
return -EFAULT;
s = compat_ptr(p);
if (put_user(s, &kcontrols->string))
return -EFAULT;
}
ucontrols++;
kcontrols++;
}
return 0;
}
static int put_v4l2_ext_controls32(struct file *file,
struct v4l2_ext_controls __user *p64,
struct v4l2_ext_controls32 __user *p32)
{
struct v4l2_ext_control32 __user *ucontrols;
struct v4l2_ext_control *kcontrols;
u32 count;
u32 n;
compat_caddr_t p;
/*
* We need to define kcontrols without __user, even though it does
* point to data in userspace here. The reason is that v4l2-ioctl.c
* copies it from userspace to kernelspace, so its definition in
* videodev2.h doesn't have a __user markup. Defining kcontrols
* with __user causes smatch warnings, so instead declare it
* without __user and cast it as a userspace pointer where needed.
*/
if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
assign_in_user(&p32->which, &p64->which) ||
get_user(count, &p64->count) ||
put_user(count, &p32->count) ||
assign_in_user(&p32->error_idx, &p64->error_idx) ||
copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)) ||
get_user(kcontrols, &p64->controls))
return -EFAULT;
if (!count || count > (U32_MAX/sizeof(*ucontrols)))
return 0;
if (get_user(p, &p32->controls))
return -EFAULT;
ucontrols = compat_ptr(p);
if (!access_ok(VERIFY_WRITE, ucontrols, count * sizeof(*ucontrols)))
return -EFAULT;
for (n = 0; n < count; n++) {
unsigned int size = sizeof(*ucontrols);
u32 id;
if (get_user_cast(id, &kcontrols->id) ||
put_user(id, &ucontrols->id) ||
assign_in_user_cast(&ucontrols->size, &kcontrols->size) ||
copy_in_user(&ucontrols->reserved2,
(void __user *)&kcontrols->reserved2,
sizeof(ucontrols->reserved2)))
return -EFAULT;
/*
* Do not modify the pointer when copying a pointer control.
* The contents of the pointer was changed, not the pointer
* itself.
*/
if (ctrl_is_pointer(file, id))
size -= sizeof(ucontrols->value64);
if (copy_in_user(ucontrols,
(void __user *)kcontrols, size))
return -EFAULT;
ucontrols++;
kcontrols++;
}
return 0;
}
struct v4l2_event32 {
__u32 type;
union {
compat_s64 value64;
__u8 data[64];
} u;
__u32 pending;
__u32 sequence;
struct compat_timespec timestamp;
__u32 id;
__u32 reserved[8];
};
static int put_v4l2_event32(struct v4l2_event __user *p64,
struct v4l2_event32 __user *p32)
{
if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
assign_in_user(&p32->type, &p64->type) ||
copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) ||
assign_in_user(&p32->pending, &p64->pending) ||
assign_in_user(&p32->sequence, &p64->sequence) ||
assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) ||
assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) ||
assign_in_user(&p32->id, &p64->id) ||
copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
return -EFAULT;
return 0;
}
struct v4l2_edid32 {
__u32 pad;
__u32 start_block;
__u32 blocks;
__u32 reserved[5];
compat_caddr_t edid;
};
static int get_v4l2_edid32(struct v4l2_edid __user *p64,
struct v4l2_edid32 __user *p32)
{
compat_uptr_t tmp;
if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) ||
assign_in_user(&p64->pad, &p32->pad) ||
assign_in_user(&p64->start_block, &p32->start_block) ||
assign_in_user_cast(&p64->blocks, &p32->blocks) ||
get_user(tmp, &p32->edid) ||
put_user_force(compat_ptr(tmp), &p64->edid) ||
copy_in_user(p64->reserved, p32->reserved, sizeof(p64->reserved)))
return -EFAULT;
return 0;
}
static int put_v4l2_edid32(struct v4l2_edid __user *p64,
struct v4l2_edid32 __user *p32)
{
void *edid;
if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) ||
assign_in_user(&p32->pad, &p64->pad) ||
assign_in_user(&p32->start_block, &p64->start_block) ||
assign_in_user(&p32->blocks, &p64->blocks) ||
get_user(edid, &p64->edid) ||
put_user(ptr_to_compat((void __user *)edid), &p32->edid) ||
copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
return -EFAULT;
return 0;
}
/*
* List of ioctls that require 32-bits/64-bits conversion
*
* The V4L2 ioctls that aren't listed there don't have pointer arguments
* and the struct size is identical for both 32 and 64 bits versions, so
* they don't need translations.
*/
#define VIDIOC_G_FMT32 _IOWR('V', 4, struct v4l2_format32)
#define VIDIOC_S_FMT32 _IOWR('V', 5, struct v4l2_format32)
#define VIDIOC_QUERYBUF32 _IOWR('V', 9, struct v4l2_buffer32)
#define VIDIOC_G_FBUF32 _IOR ('V', 10, struct v4l2_framebuffer32)
#define VIDIOC_S_FBUF32 _IOW ('V', 11, struct v4l2_framebuffer32)
#define VIDIOC_QBUF32 _IOWR('V', 15, struct v4l2_buffer32)
#define VIDIOC_DQBUF32 _IOWR('V', 17, struct v4l2_buffer32)
#define VIDIOC_ENUMSTD32 _IOWR('V', 25, struct v4l2_standard32)
#define VIDIOC_ENUMINPUT32 _IOWR('V', 26, struct v4l2_input32)
#define VIDIOC_G_EDID32 _IOWR('V', 40, struct v4l2_edid32)
#define VIDIOC_S_EDID32 _IOWR('V', 41, struct v4l2_edid32)
#define VIDIOC_TRY_FMT32 _IOWR('V', 64, struct v4l2_format32)
#define VIDIOC_G_EXT_CTRLS32 _IOWR('V', 71, struct v4l2_ext_controls32)
#define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32)
#define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32)
#define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32)
#define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32)
#define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32)
#define VIDIOC_OVERLAY32 _IOW ('V', 14, s32)
#define VIDIOC_STREAMON32 _IOW ('V', 18, s32)
#define VIDIOC_STREAMOFF32 _IOW ('V', 19, s32)
#define VIDIOC_G_INPUT32 _IOR ('V', 38, s32)
#define VIDIOC_S_INPUT32 _IOWR('V', 39, s32)
#define VIDIOC_G_OUTPUT32 _IOR ('V', 46, s32)
#define VIDIOC_S_OUTPUT32 _IOWR('V', 47, s32)
/**
* alloc_userspace() - Allocates a 64-bits userspace pointer compatible
* for calling the native 64-bits version of an ioctl.
*
* @size: size of the structure itself to be allocated.
* @aux_space: extra size needed to store "extra" data, e.g. space for
* other __user data that is pointed to fields inside the
* structure.
* @new_p64: pointer to a pointer to be filled with the allocated struct.
*
* Return:
*
* if it can't allocate memory, either -ENOMEM or -EFAULT will be returned.
* Zero otherwise.
*/
static int alloc_userspace(unsigned int size, u32 aux_space,
void __user **new_p64)
{
*new_p64 = compat_alloc_user_space(size + aux_space);
if (!*new_p64)
return -ENOMEM;
if (clear_user(*new_p64, size))
return -EFAULT;
return 0;
}
/**
* do_video_ioctl() - Ancillary function with handles a compat32 ioctl call
*
* @file: pointer to &struct file with the file handler
* @cmd: ioctl to be called
* @arg: arguments passed from/to the ioctl handler
*
* This function is called when a 32 bits application calls a V4L2 ioctl
* and the Kernel is compiled with 64 bits.
*
* This function is called by v4l2_compat_ioctl32() when the function is
* not private to some specific driver.
*
* It converts a 32-bits struct into a 64 bits one, calls the native 64-bits
* ioctl handler and fills back the 32-bits struct with the results of the
* native call.
*/
static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *p32 = compat_ptr(arg);
void __user *new_p64 = NULL;
void __user *aux_buf;
u32 aux_space;
int compatible_arg = 1;
long err = 0;
/*
* 1. When struct size is different, converts the command.
*/
switch (cmd) {
case VIDIOC_G_FMT32: cmd = VIDIOC_G_FMT; break;
case VIDIOC_S_FMT32: cmd = VIDIOC_S_FMT; break;
case VIDIOC_QUERYBUF32: cmd = VIDIOC_QUERYBUF; break;
case VIDIOC_G_FBUF32: cmd = VIDIOC_G_FBUF; break;
case VIDIOC_S_FBUF32: cmd = VIDIOC_S_FBUF; break;
case VIDIOC_QBUF32: cmd = VIDIOC_QBUF; break;
case VIDIOC_DQBUF32: cmd = VIDIOC_DQBUF; break;
case VIDIOC_ENUMSTD32: cmd = VIDIOC_ENUMSTD; break;
case VIDIOC_ENUMINPUT32: cmd = VIDIOC_ENUMINPUT; break;
case VIDIOC_TRY_FMT32: cmd = VIDIOC_TRY_FMT; break;
case VIDIOC_G_EXT_CTRLS32: cmd = VIDIOC_G_EXT_CTRLS; break;
case VIDIOC_S_EXT_CTRLS32: cmd = VIDIOC_S_EXT_CTRLS; break;
case VIDIOC_TRY_EXT_CTRLS32: cmd = VIDIOC_TRY_EXT_CTRLS; break;
case VIDIOC_DQEVENT32: cmd = VIDIOC_DQEVENT; break;
case VIDIOC_OVERLAY32: cmd = VIDIOC_OVERLAY; break;
case VIDIOC_STREAMON32: cmd = VIDIOC_STREAMON; break;
case VIDIOC_STREAMOFF32: cmd = VIDIOC_STREAMOFF; break;
case VIDIOC_G_INPUT32: cmd = VIDIOC_G_INPUT; break;
case VIDIOC_S_INPUT32: cmd = VIDIOC_S_INPUT; break;
case VIDIOC_G_OUTPUT32: cmd = VIDIOC_G_OUTPUT; break;
case VIDIOC_S_OUTPUT32: cmd = VIDIOC_S_OUTPUT; break;
case VIDIOC_CREATE_BUFS32: cmd = VIDIOC_CREATE_BUFS; break;
case VIDIOC_PREPARE_BUF32: cmd = VIDIOC_PREPARE_BUF; break;
case VIDIOC_G_EDID32: cmd = VIDIOC_G_EDID; break;
case VIDIOC_S_EDID32: cmd = VIDIOC_S_EDID; break;
}
/*
* 2. Allocates a 64-bits userspace pointer to store the
* values of the ioctl and copy data from the 32-bits __user
* argument into it.
*/
switch (cmd) {
case VIDIOC_OVERLAY:
case VIDIOC_STREAMON:
case VIDIOC_STREAMOFF:
case VIDIOC_S_INPUT:
case VIDIOC_S_OUTPUT:
err = alloc_userspace(sizeof(unsigned int), 0, &new_p64);
if (!err && assign_in_user((unsigned int __user *)new_p64,
(compat_uint_t __user *)p32))
err = -EFAULT;
compatible_arg = 0;
break;
case VIDIOC_G_INPUT:
case VIDIOC_G_OUTPUT:
err = alloc_userspace(sizeof(unsigned int), 0, &new_p64);
compatible_arg = 0;
break;
case VIDIOC_G_EDID:
case VIDIOC_S_EDID:
err = alloc_userspace(sizeof(struct v4l2_edid), 0, &new_p64);
if (!err)
err = get_v4l2_edid32(new_p64, p32);
compatible_arg = 0;
break;
case VIDIOC_G_FMT:
case VIDIOC_S_FMT:
case VIDIOC_TRY_FMT:
err = bufsize_v4l2_format(p32, &aux_space);
if (!err)
err = alloc_userspace(sizeof(struct v4l2_format),
aux_space, &new_p64);
if (!err) {
aux_buf = new_p64 + sizeof(struct v4l2_format);
err = get_v4l2_format32(new_p64, p32,
aux_buf, aux_space);
}
compatible_arg = 0;
break;
case VIDIOC_CREATE_BUFS:
err = bufsize_v4l2_create(p32, &aux_space);
if (!err)
err = alloc_userspace(sizeof(struct v4l2_create_buffers),
aux_space, &new_p64);
if (!err) {
aux_buf = new_p64 + sizeof(struct v4l2_create_buffers);
err = get_v4l2_create32(new_p64, p32,
aux_buf, aux_space);
}
compatible_arg = 0;
break;
case VIDIOC_PREPARE_BUF:
case VIDIOC_QUERYBUF:
case VIDIOC_QBUF:
case VIDIOC_DQBUF:
err = bufsize_v4l2_buffer(p32, &aux_space);
if (!err)
err = alloc_userspace(sizeof(struct v4l2_buffer),
aux_space, &new_p64);
if (!err) {
aux_buf = new_p64 + sizeof(struct v4l2_buffer);
err = get_v4l2_buffer32(new_p64, p32,
aux_buf, aux_space);
}
compatible_arg = 0;
break;
case VIDIOC_S_FBUF:
err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0,
&new_p64);
if (!err)
err = get_v4l2_framebuffer32(new_p64, p32);
compatible_arg = 0;
break;
case VIDIOC_G_FBUF:
err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0,
&new_p64);
compatible_arg = 0;
break;
case VIDIOC_ENUMSTD:
err = alloc_userspace(sizeof(struct v4l2_standard), 0,
&new_p64);
if (!err)
err = get_v4l2_standard32(new_p64, p32);
compatible_arg = 0;
break;
case VIDIOC_ENUMINPUT:
err = alloc_userspace(sizeof(struct v4l2_input), 0, &new_p64);
if (!err)
err = get_v4l2_input32(new_p64, p32);
compatible_arg = 0;
break;
case VIDIOC_G_EXT_CTRLS:
case VIDIOC_S_EXT_CTRLS:
case VIDIOC_TRY_EXT_CTRLS:
err = bufsize_v4l2_ext_controls(p32, &aux_space);
if (!err)
err = alloc_userspace(sizeof(struct v4l2_ext_controls),
aux_space, &new_p64);
if (!err) {
aux_buf = new_p64 + sizeof(struct v4l2_ext_controls);
err = get_v4l2_ext_controls32(file, new_p64, p32,
aux_buf, aux_space);
}
compatible_arg = 0;
break;
case VIDIOC_DQEVENT:
err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64);
compatible_arg = 0;
break;
}
if (err)
return err;
/*
* 3. Calls the native 64-bits ioctl handler.
*
* For the functions where a conversion was not needed,
* compatible_arg is true, and it will call it with the arguments
* provided by userspace and stored at @p32 var.
*
* Otherwise, it will pass the newly allocated @new_p64 argument.
*/
if (compatible_arg)
err = native_ioctl(file, cmd, (unsigned long)p32);
else
err = native_ioctl(file, cmd, (unsigned long)new_p64);
if (err == -ENOTTY)
return err;
/*
* 4. Special case: even after an error we need to put the
* results back for some ioctls.
*
* In the case of EXT_CTRLS, the error_idx will contain information
* on which control failed.
*
* In the case of S_EDID, the driver can return E2BIG and set
* the blocks to maximum allowed value.
*/
switch (cmd) {
case VIDIOC_G_EXT_CTRLS:
case VIDIOC_S_EXT_CTRLS:
case VIDIOC_TRY_EXT_CTRLS:
if (put_v4l2_ext_controls32(file, new_p64, p32))
err = -EFAULT;
break;
case VIDIOC_S_EDID:
if (put_v4l2_edid32(new_p64, p32))
err = -EFAULT;
break;
}
if (err)
return err;
/*
* 5. Copy the data returned at the 64 bits userspace pointer to
* the original 32 bits structure.
*/
switch (cmd) {
case VIDIOC_S_INPUT:
case VIDIOC_S_OUTPUT:
case VIDIOC_G_INPUT:
case VIDIOC_G_OUTPUT:
if (assign_in_user((compat_uint_t __user *)p32,
((unsigned int __user *)new_p64)))
err = -EFAULT;
break;
case VIDIOC_G_FBUF:
err = put_v4l2_framebuffer32(new_p64, p32);
break;
case VIDIOC_DQEVENT:
err = put_v4l2_event32(new_p64, p32);
break;
case VIDIOC_G_EDID:
err = put_v4l2_edid32(new_p64, p32);
break;
case VIDIOC_G_FMT:
case VIDIOC_S_FMT:
case VIDIOC_TRY_FMT:
err = put_v4l2_format32(new_p64, p32);
break;
case VIDIOC_CREATE_BUFS:
err = put_v4l2_create32(new_p64, p32);
break;
case VIDIOC_PREPARE_BUF:
case VIDIOC_QUERYBUF:
case VIDIOC_QBUF:
case VIDIOC_DQBUF:
err = put_v4l2_buffer32(new_p64, p32);
break;
case VIDIOC_ENUMSTD:
err = put_v4l2_standard32(new_p64, p32);
break;
case VIDIOC_ENUMINPUT:
err = put_v4l2_input32(new_p64, p32);
break;
}
return err;
}
/**
* v4l2_compat_ioctl32() - Handles a compat32 ioctl call
*
* @file: pointer to &struct file with the file handler
* @cmd: ioctl to be called
* @arg: arguments passed from/to the ioctl handler
*
* This function is meant to be used as .compat_ioctl fops at v4l2-dev.c
* in order to deal with 32-bit calls on a 64-bits Kernel.
*
* This function calls do_video_ioctl() for non-private V4L2 ioctls.
* If the function is a private one it calls vdev->fops->compat_ioctl32
* instead.
*/
long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)
{
struct video_device *vdev = video_devdata(file);
long ret = -ENOIOCTLCMD;
if (!file->f_op->unlocked_ioctl)
return ret;
if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
ret = do_video_ioctl(file, cmd, arg);
else if (vdev->fops->compat_ioctl32)
ret = vdev->fops->compat_ioctl32(file, cmd, arg);
if (ret == -ENOIOCTLCMD)
pr_debug("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)\n",
_IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32);
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