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linux-stable/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
Arnd Bergmann 965ccdedf1 media: v4l2-core: compat: ignore native command codes 
commit 4a873f3fa5 upstream.

The do_video_ioctl() compat handler converts the compat command
codes into the native ones before processing further, but this
causes problems for 32-bit user applications that pass a command
code that matches a 64-bit native number, which will then be
handled the same way.

Specifically, this breaks VIDIOC_DQEVENT_TIME from user space
applications with 64-bit time_t, as the structure layout is
the same as the native 64-bit layout on many architectures
(x86 being the notable exception).

Change the handler to use the converted command code only for
passing into the native ioctl handler, not for deciding on the
conversion, in order to make the compat behavior match the
native behavior.

Actual support for the 64-bit time_t version of VIDIOC_DQEVENT_TIME
and other commands still needs to be added in a separate patch.

Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-02-11 04:35:14 -08:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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(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
* @capabilities: capabilities of this buffer type.
* @reserved: future extensions
*/
struct v4l2_create_buffers32 {
__u32 index;
__u32 count;
__u32 memory; /* enum v4l2_memory */
struct v4l2_format32 format;
__u32 capabilities;
__u32 reserved[7];
};
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(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:
case V4L2_BUF_TYPE_META_OUTPUT:
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(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(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(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:
case V4L2_BUF_TYPE_META_OUTPUT:
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(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(p32, sizeof(*p32)) ||
copy_in_user(p32, p64,
offsetof(struct v4l2_create_buffers32, format)) ||
assign_in_user(&p32->capabilities, &p64->capabilities) ||
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(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(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;
__s32 request_fd;
};
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(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;
s32 request_fd;
enum v4l2_memory memory;
struct v4l2_plane32 __user *uplane32;
struct v4l2_plane __user *uplane;
compat_caddr_t p;
int ret;
if (!access_ok(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) ||
get_user(request_fd, &p32->request_fd) ||
put_user(request_fd, &p64->request_fd))
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(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(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->request_fd, &p64->request_fd) ||
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(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(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;
__s32 request_fd;
__u32 reserved[1];
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(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(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) ||
assign_in_user(&p64->request_fd, &p32->request_fd) ||
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(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(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) ||
assign_in_user(&p32->request_fd, &p64->request_fd) ||
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(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(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(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(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;
unsigned int ncmd;
/*
* 1. When struct size is different, converts the command.
*/
switch (cmd) {
case VIDIOC_G_FMT32: ncmd = VIDIOC_G_FMT; break;
case VIDIOC_S_FMT32: ncmd = VIDIOC_S_FMT; break;
case VIDIOC_QUERYBUF32: ncmd = VIDIOC_QUERYBUF; break;
case VIDIOC_G_FBUF32: ncmd = VIDIOC_G_FBUF; break;
case VIDIOC_S_FBUF32: ncmd = VIDIOC_S_FBUF; break;
case VIDIOC_QBUF32: ncmd = VIDIOC_QBUF; break;
case VIDIOC_DQBUF32: ncmd = VIDIOC_DQBUF; break;
case VIDIOC_ENUMSTD32: ncmd = VIDIOC_ENUMSTD; break;
case VIDIOC_ENUMINPUT32: ncmd = VIDIOC_ENUMINPUT; break;
case VIDIOC_TRY_FMT32: ncmd = VIDIOC_TRY_FMT; break;
case VIDIOC_G_EXT_CTRLS32: ncmd = VIDIOC_G_EXT_CTRLS; break;
case VIDIOC_S_EXT_CTRLS32: ncmd = VIDIOC_S_EXT_CTRLS; break;
case VIDIOC_TRY_EXT_CTRLS32: ncmd = VIDIOC_TRY_EXT_CTRLS; break;
case VIDIOC_DQEVENT32: ncmd = VIDIOC_DQEVENT; break;
case VIDIOC_OVERLAY32: ncmd = VIDIOC_OVERLAY; break;
case VIDIOC_STREAMON32: ncmd = VIDIOC_STREAMON; break;
case VIDIOC_STREAMOFF32: ncmd = VIDIOC_STREAMOFF; break;
case VIDIOC_G_INPUT32: ncmd = VIDIOC_G_INPUT; break;
case VIDIOC_S_INPUT32: ncmd = VIDIOC_S_INPUT; break;
case VIDIOC_G_OUTPUT32: ncmd = VIDIOC_G_OUTPUT; break;
case VIDIOC_S_OUTPUT32: ncmd = VIDIOC_S_OUTPUT; break;
case VIDIOC_CREATE_BUFS32: ncmd = VIDIOC_CREATE_BUFS; break;
case VIDIOC_PREPARE_BUF32: ncmd = VIDIOC_PREPARE_BUF; break;
case VIDIOC_G_EDID32: ncmd = VIDIOC_G_EDID; break;
case VIDIOC_S_EDID32: ncmd = VIDIOC_S_EDID; break;
default: ncmd = cmd; 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_OVERLAY32:
case VIDIOC_STREAMON32:
case VIDIOC_STREAMOFF32:
case VIDIOC_S_INPUT32:
case VIDIOC_S_OUTPUT32:
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_INPUT32:
case VIDIOC_G_OUTPUT32:
err = alloc_userspace(sizeof(unsigned int), 0, &new_p64);
compatible_arg = 0;
break;
case VIDIOC_G_EDID32:
case VIDIOC_S_EDID32:
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_FMT32:
case VIDIOC_S_FMT32:
case VIDIOC_TRY_FMT32:
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_BUFS32:
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_BUF32:
case VIDIOC_QUERYBUF32:
case VIDIOC_QBUF32:
case VIDIOC_DQBUF32:
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_FBUF32:
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_FBUF32:
err = alloc_userspace(sizeof(struct v4l2_framebuffer), 0,
&new_p64);
compatible_arg = 0;
break;
case VIDIOC_ENUMSTD32:
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_ENUMINPUT32:
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_CTRLS32:
case VIDIOC_S_EXT_CTRLS32:
case VIDIOC_TRY_EXT_CTRLS32:
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_DQEVENT32:
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, ncmd, (unsigned long)p32);
else
err = native_ioctl(file, ncmd, (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_CTRLS32:
case VIDIOC_S_EXT_CTRLS32:
case VIDIOC_TRY_EXT_CTRLS32:
if (put_v4l2_ext_controls32(file, new_p64, p32))
err = -EFAULT;
break;
case VIDIOC_S_EDID32:
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_INPUT32:
case VIDIOC_S_OUTPUT32:
case VIDIOC_G_INPUT32:
case VIDIOC_G_OUTPUT32:
if (assign_in_user((compat_uint_t __user *)p32,
((unsigned int __user *)new_p64)))
err = -EFAULT;
break;
case VIDIOC_G_FBUF32:
err = put_v4l2_framebuffer32(new_p64, p32);
break;
case VIDIOC_DQEVENT32:
err = put_v4l2_event32(new_p64, p32);
break;
case VIDIOC_G_EDID32:
err = put_v4l2_edid32(new_p64, p32);
break;
case VIDIOC_G_FMT32:
case VIDIOC_S_FMT32:
case VIDIOC_TRY_FMT32:
err = put_v4l2_format32(new_p64, p32);
break;
case VIDIOC_CREATE_BUFS32:
err = put_v4l2_create32(new_p64, p32);
break;
case VIDIOC_PREPARE_BUF32:
case VIDIOC_QUERYBUF32:
case VIDIOC_QBUF32:
case VIDIOC_DQBUF32:
err = put_v4l2_buffer32(new_p64, p32);
break;
case VIDIOC_ENUMSTD32:
err = put_v4l2_standard32(new_p64, p32);
break;
case VIDIOC_ENUMINPUT32:
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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