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linux/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
Arnd Bergmann 678d92b612 media: v4l2-core: fix VIDIOC_DQEVENT handling on non-x86 
My previous bugfix addressed an API inconsistency found by syzbot,
and it correctly fixed the issue on x86-64 machines, which now behave
correctly for both native and compat tasks.

Unfortunately, John found that the patch broke compat mode on all other
architectures, as they can no longer rely on the VIDIOC_DQEVENT_TIME32
code from the native handler as a fallback in the compat code.

The best way I can see for addressing this is to generalize the
VIDIOC_DQEVENT32_TIME32 code from x86 and use that for all architectures,
leaving only the VIDIOC_DQEVENT32 variant as x86 specific. The original
code was trying to be clever and use the same conversion helper for native
32-bit code and compat mode, but that turned out to be too obscure so
even I missed that bit I had introduced myself when I made the fix.

Fixes: c344f07aa1 ("media: v4l2-core: ignore native time32 ioctls on 64-bit")
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2021-11-10 11:38:26 +00:00

1262 lines
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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>
/*
* 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 *p64,
struct v4l2_window32 __user *p32)
{
struct v4l2_window32 w32;
if (copy_from_user(&w32, p32, sizeof(w32)))
return -EFAULT;
*p64 = (struct v4l2_window) {
.w = w32.w,
.field = w32.field,
.chromakey = w32.chromakey,
.clips = (void __force *)compat_ptr(w32.clips),
.clipcount = w32.clipcount,
.bitmap = compat_ptr(w32.bitmap),
.global_alpha = w32.global_alpha,
};
if (p64->clipcount > 2048)
return -EINVAL;
if (!p64->clipcount)
p64->clips = NULL;
return 0;
}
static int put_v4l2_window32(struct v4l2_window *p64,
struct v4l2_window32 __user *p32)
{
struct v4l2_window32 w32;
memset(&w32, 0, sizeof(w32));
w32 = (struct v4l2_window32) {
.w = p64->w,
.field = p64->field,
.chromakey = p64->chromakey,
.clips = (uintptr_t)p64->clips,
.clipcount = p64->clipcount,
.bitmap = ptr_to_compat(p64->bitmap),
.global_alpha = p64->global_alpha,
};
/* copy everything except the clips pointer */
if (copy_to_user(p32, &w32, offsetof(struct v4l2_window32, clips)) ||
copy_to_user(&p32->clipcount, &w32.clipcount,
sizeof(w32) - offsetof(struct v4l2_window32, clipcount)))
return -EFAULT;
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.
* @flags: additional buffer management attributes (ignored unless the
* queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability and
* configured for MMAP streaming I/O).
* @reserved: future extensions
*/
struct v4l2_create_buffers32 {
__u32 index;
__u32 count;
__u32 memory; /* enum v4l2_memory */
struct v4l2_format32 format;
__u32 capabilities;
__u32 flags;
__u32 reserved[6];
};
static int get_v4l2_format32(struct v4l2_format *p64,
struct v4l2_format32 __user *p32)
{
if (get_user(p64->type, &p32->type))
return -EFAULT;
switch (p64->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
return copy_from_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_from_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);
case V4L2_BUF_TYPE_VBI_CAPTURE:
case V4L2_BUF_TYPE_VBI_OUTPUT:
return copy_from_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_from_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_from_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_from_user(&p64->fmt.meta, &p32->fmt.meta,
sizeof(p64->fmt.meta)) ? -EFAULT : 0;
default:
return -EINVAL;
}
}
static int get_v4l2_create32(struct v4l2_create_buffers *p64,
struct v4l2_create_buffers32 __user *p32)
{
if (copy_from_user(p64, p32,
offsetof(struct v4l2_create_buffers32, format)))
return -EFAULT;
if (copy_from_user(&p64->flags, &p32->flags, sizeof(p32->flags)))
return -EFAULT;
return get_v4l2_format32(&p64->format, &p32->format);
}
static int put_v4l2_format32(struct v4l2_format *p64,
struct v4l2_format32 __user *p32)
{
switch (p64->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
return copy_to_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_to_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_to_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_to_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_to_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_to_user(&p32->fmt.meta, &p64->fmt.meta,
sizeof(p64->fmt.meta)) ? -EFAULT : 0;
default:
return -EINVAL;
}
}
static int put_v4l2_create32(struct v4l2_create_buffers *p64,
struct v4l2_create_buffers32 __user *p32)
{
if (copy_to_user(p32, p64,
offsetof(struct v4l2_create_buffers32, format)) ||
put_user(p64->capabilities, &p32->capabilities) ||
put_user(p64->flags, &p32->flags) ||
copy_to_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 *p64,
struct v4l2_standard32 __user *p32)
{
/* other fields are not set by the user, nor used by the driver */
return get_user(p64->index, &p32->index);
}
static int put_v4l2_standard32(struct v4l2_standard *p64,
struct v4l2_standard32 __user *p32)
{
if (put_user(p64->index, &p32->index) ||
put_user(p64->id, &p32->id) ||
copy_to_user(p32->name, p64->name, sizeof(p32->name)) ||
copy_to_user(&p32->frameperiod, &p64->frameperiod,
sizeof(p32->frameperiod)) ||
put_user(p64->framelines, &p32->framelines) ||
copy_to_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];
};
/*
* This is correct for all architectures including i386, but not x32,
* which has different alignment requirements for timestamp
*/
struct v4l2_buffer32 {
__u32 index;
__u32 type; /* enum v4l2_buf_type */
__u32 bytesused;
__u32 flags;
__u32 field; /* enum v4l2_field */
struct {
compat_s64 tv_sec;
compat_s64 tv_usec;
} 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;
};
#ifdef CONFIG_COMPAT_32BIT_TIME
struct v4l2_buffer32_time32 {
__u32 index;
__u32 type; /* enum v4l2_buf_type */
__u32 bytesused;
__u32 flags;
__u32 field; /* enum v4l2_field */
struct old_timeval32 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;
};
#endif
static int get_v4l2_plane32(struct v4l2_plane *p64,
struct v4l2_plane32 __user *p32,
enum v4l2_memory memory)
{
struct v4l2_plane32 plane32;
typeof(p64->m) m = {};
if (copy_from_user(&plane32, p32, sizeof(plane32)))
return -EFAULT;
switch (memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
m.mem_offset = plane32.m.mem_offset;
break;
case V4L2_MEMORY_USERPTR:
m.userptr = (unsigned long)compat_ptr(plane32.m.userptr);
break;
case V4L2_MEMORY_DMABUF:
m.fd = plane32.m.fd;
break;
}
memset(p64, 0, sizeof(*p64));
*p64 = (struct v4l2_plane) {
.bytesused = plane32.bytesused,
.length = plane32.length,
.m = m,
.data_offset = plane32.data_offset,
};
return 0;
}
static int put_v4l2_plane32(struct v4l2_plane *p64,
struct v4l2_plane32 __user *p32,
enum v4l2_memory memory)
{
struct v4l2_plane32 plane32;
memset(&plane32, 0, sizeof(plane32));
plane32 = (struct v4l2_plane32) {
.bytesused = p64->bytesused,
.length = p64->length,
.data_offset = p64->data_offset,
};
switch (memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
plane32.m.mem_offset = p64->m.mem_offset;
break;
case V4L2_MEMORY_USERPTR:
plane32.m.userptr = (uintptr_t)(p64->m.userptr);
break;
case V4L2_MEMORY_DMABUF:
plane32.m.fd = p64->m.fd;
break;
}
if (copy_to_user(p32, &plane32, sizeof(plane32)))
return -EFAULT;
return 0;
}
static int get_v4l2_buffer32(struct v4l2_buffer *vb,
struct v4l2_buffer32 __user *arg)
{
struct v4l2_buffer32 vb32;
if (copy_from_user(&vb32, arg, sizeof(vb32)))
return -EFAULT;
memset(vb, 0, sizeof(*vb));
*vb = (struct v4l2_buffer) {
.index = vb32.index,
.type = vb32.type,
.bytesused = vb32.bytesused,
.flags = vb32.flags,
.field = vb32.field,
.timestamp.tv_sec = vb32.timestamp.tv_sec,
.timestamp.tv_usec = vb32.timestamp.tv_usec,
.timecode = vb32.timecode,
.sequence = vb32.sequence,
.memory = vb32.memory,
.m.offset = vb32.m.offset,
.length = vb32.length,
.request_fd = vb32.request_fd,
};
switch (vb->memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
vb->m.offset = vb32.m.offset;
break;
case V4L2_MEMORY_USERPTR:
vb->m.userptr = (unsigned long)compat_ptr(vb32.m.userptr);
break;
case V4L2_MEMORY_DMABUF:
vb->m.fd = vb32.m.fd;
break;
}
if (V4L2_TYPE_IS_MULTIPLANAR(vb->type))
vb->m.planes = (void __force *)
compat_ptr(vb32.m.planes);
return 0;
}
#ifdef CONFIG_COMPAT_32BIT_TIME
static int get_v4l2_buffer32_time32(struct v4l2_buffer *vb,
struct v4l2_buffer32_time32 __user *arg)
{
struct v4l2_buffer32_time32 vb32;
if (copy_from_user(&vb32, arg, sizeof(vb32)))
return -EFAULT;
*vb = (struct v4l2_buffer) {
.index = vb32.index,
.type = vb32.type,
.bytesused = vb32.bytesused,
.flags = vb32.flags,
.field = vb32.field,
.timestamp.tv_sec = vb32.timestamp.tv_sec,
.timestamp.tv_usec = vb32.timestamp.tv_usec,
.timecode = vb32.timecode,
.sequence = vb32.sequence,
.memory = vb32.memory,
.m.offset = vb32.m.offset,
.length = vb32.length,
.request_fd = vb32.request_fd,
};
switch (vb->memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
vb->m.offset = vb32.m.offset;
break;
case V4L2_MEMORY_USERPTR:
vb->m.userptr = (unsigned long)compat_ptr(vb32.m.userptr);
break;
case V4L2_MEMORY_DMABUF:
vb->m.fd = vb32.m.fd;
break;
}
if (V4L2_TYPE_IS_MULTIPLANAR(vb->type))
vb->m.planes = (void __force *)
compat_ptr(vb32.m.planes);
return 0;
}
#endif
static int put_v4l2_buffer32(struct v4l2_buffer *vb,
struct v4l2_buffer32 __user *arg)
{
struct v4l2_buffer32 vb32;
memset(&vb32, 0, sizeof(vb32));
vb32 = (struct v4l2_buffer32) {
.index = vb->index,
.type = vb->type,
.bytesused = vb->bytesused,
.flags = vb->flags,
.field = vb->field,
.timestamp.tv_sec = vb->timestamp.tv_sec,
.timestamp.tv_usec = vb->timestamp.tv_usec,
.timecode = vb->timecode,
.sequence = vb->sequence,
.memory = vb->memory,
.m.offset = vb->m.offset,
.length = vb->length,
.request_fd = vb->request_fd,
};
switch (vb->memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
vb32.m.offset = vb->m.offset;
break;
case V4L2_MEMORY_USERPTR:
vb32.m.userptr = (uintptr_t)(vb->m.userptr);
break;
case V4L2_MEMORY_DMABUF:
vb32.m.fd = vb->m.fd;
break;
}
if (V4L2_TYPE_IS_MULTIPLANAR(vb->type))
vb32.m.planes = (uintptr_t)vb->m.planes;
if (copy_to_user(arg, &vb32, sizeof(vb32)))
return -EFAULT;
return 0;
}
#ifdef CONFIG_COMPAT_32BIT_TIME
static int put_v4l2_buffer32_time32(struct v4l2_buffer *vb,
struct v4l2_buffer32_time32 __user *arg)
{
struct v4l2_buffer32_time32 vb32;
memset(&vb32, 0, sizeof(vb32));
vb32 = (struct v4l2_buffer32_time32) {
.index = vb->index,
.type = vb->type,
.bytesused = vb->bytesused,
.flags = vb->flags,
.field = vb->field,
.timestamp.tv_sec = vb->timestamp.tv_sec,
.timestamp.tv_usec = vb->timestamp.tv_usec,
.timecode = vb->timecode,
.sequence = vb->sequence,
.memory = vb->memory,
.m.offset = vb->m.offset,
.length = vb->length,
.request_fd = vb->request_fd,
};
switch (vb->memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_OVERLAY:
vb32.m.offset = vb->m.offset;
break;
case V4L2_MEMORY_USERPTR:
vb32.m.userptr = (uintptr_t)(vb->m.userptr);
break;
case V4L2_MEMORY_DMABUF:
vb32.m.fd = vb->m.fd;
break;
}
if (V4L2_TYPE_IS_MULTIPLANAR(vb->type))
vb32.m.planes = (uintptr_t)vb->m.planes;
if (copy_to_user(arg, &vb32, sizeof(vb32)))
return -EFAULT;
return 0;
}
#endif
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 *p64,
struct v4l2_framebuffer32 __user *p32)
{
compat_caddr_t tmp;
if (get_user(tmp, &p32->base) ||
get_user(p64->capability, &p32->capability) ||
get_user(p64->flags, &p32->flags) ||
copy_from_user(&p64->fmt, &p32->fmt, sizeof(p64->fmt)))
return -EFAULT;
p64->base = (void __force *)compat_ptr(tmp);
return 0;
}
static int put_v4l2_framebuffer32(struct v4l2_framebuffer *p64,
struct v4l2_framebuffer32 __user *p32)
{
if (put_user((uintptr_t)p64->base, &p32->base) ||
put_user(p64->capability, &p32->capability) ||
put_user(p64->flags, &p32->flags) ||
copy_to_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 *p64,
struct v4l2_input32 __user *p32)
{
if (copy_from_user(p64, p32, sizeof(*p32)))
return -EFAULT;
return 0;
}
static inline int put_v4l2_input32(struct v4l2_input *p64,
struct v4l2_input32 __user *p32)
{
if (copy_to_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 get_v4l2_ext_controls32(struct v4l2_ext_controls *p64,
struct v4l2_ext_controls32 __user *p32)
{
struct v4l2_ext_controls32 ec32;
if (copy_from_user(&ec32, p32, sizeof(ec32)))
return -EFAULT;
*p64 = (struct v4l2_ext_controls) {
.which = ec32.which,
.count = ec32.count,
.error_idx = ec32.error_idx,
.request_fd = ec32.request_fd,
.reserved[0] = ec32.reserved[0],
.controls = (void __force *)compat_ptr(ec32.controls),
};
return 0;
}
static int put_v4l2_ext_controls32(struct v4l2_ext_controls *p64,
struct v4l2_ext_controls32 __user *p32)
{
struct v4l2_ext_controls32 ec32;
memset(&ec32, 0, sizeof(ec32));
ec32 = (struct v4l2_ext_controls32) {
.which = p64->which,
.count = p64->count,
.error_idx = p64->error_idx,
.request_fd = p64->request_fd,
.reserved[0] = p64->reserved[0],
.controls = (uintptr_t)p64->controls,
};
if (copy_to_user(p32, &ec32, sizeof(ec32)))
return -EFAULT;
return 0;
}
#ifdef CONFIG_X86_64
/*
* x86 is the only compat architecture with different struct alignment
* between 32-bit and 64-bit tasks.
*/
struct v4l2_event32 {
__u32 type;
union {
compat_s64 value64;
__u8 data[64];
} u;
__u32 pending;
__u32 sequence;
struct {
compat_s64 tv_sec;
compat_s64 tv_nsec;
} timestamp;
__u32 id;
__u32 reserved[8];
};
static int put_v4l2_event32(struct v4l2_event *p64,
struct v4l2_event32 __user *p32)
{
if (put_user(p64->type, &p32->type) ||
copy_to_user(&p32->u, &p64->u, sizeof(p64->u)) ||
put_user(p64->pending, &p32->pending) ||
put_user(p64->sequence, &p32->sequence) ||
put_user(p64->timestamp.tv_sec, &p32->timestamp.tv_sec) ||
put_user(p64->timestamp.tv_nsec, &p32->timestamp.tv_nsec) ||
put_user(p64->id, &p32->id) ||
copy_to_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
return -EFAULT;
return 0;
}
#endif
#ifdef CONFIG_COMPAT_32BIT_TIME
struct v4l2_event32_time32 {
__u32 type;
union {
compat_s64 value64;
__u8 data[64];
} u;
__u32 pending;
__u32 sequence;
struct old_timespec32 timestamp;
__u32 id;
__u32 reserved[8];
};
static int put_v4l2_event32_time32(struct v4l2_event *p64,
struct v4l2_event32_time32 __user *p32)
{
if (put_user(p64->type, &p32->type) ||
copy_to_user(&p32->u, &p64->u, sizeof(p64->u)) ||
put_user(p64->pending, &p32->pending) ||
put_user(p64->sequence, &p32->sequence) ||
put_user(p64->timestamp.tv_sec, &p32->timestamp.tv_sec) ||
put_user(p64->timestamp.tv_nsec, &p32->timestamp.tv_nsec) ||
put_user(p64->id, &p32->id) ||
copy_to_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
return -EFAULT;
return 0;
}
#endif
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 *p64,
struct v4l2_edid32 __user *p32)
{
compat_uptr_t edid;
if (copy_from_user(p64, p32, offsetof(struct v4l2_edid32, edid)) ||
get_user(edid, &p32->edid))
return -EFAULT;
p64->edid = (void __force *)compat_ptr(edid);
return 0;
}
static int put_v4l2_edid32(struct v4l2_edid *p64,
struct v4l2_edid32 __user *p32)
{
if (copy_to_user(p32, p64, offsetof(struct v4l2_edid32, edid)))
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)
#ifdef CONFIG_COMPAT_32BIT_TIME
#define VIDIOC_QUERYBUF32_TIME32 _IOWR('V', 9, struct v4l2_buffer32_time32)
#define VIDIOC_QBUF32_TIME32 _IOWR('V', 15, struct v4l2_buffer32_time32)
#define VIDIOC_DQBUF32_TIME32 _IOWR('V', 17, struct v4l2_buffer32_time32)
#define VIDIOC_DQEVENT32_TIME32 _IOR ('V', 89, struct v4l2_event32_time32)
#define VIDIOC_PREPARE_BUF32_TIME32 _IOWR('V', 93, struct v4l2_buffer32_time32)
#endif
unsigned int v4l2_compat_translate_cmd(unsigned int cmd)
{
switch (cmd) {
case VIDIOC_G_FMT32:
return VIDIOC_G_FMT;
case VIDIOC_S_FMT32:
return VIDIOC_S_FMT;
case VIDIOC_TRY_FMT32:
return VIDIOC_TRY_FMT;
case VIDIOC_G_FBUF32:
return VIDIOC_G_FBUF;
case VIDIOC_S_FBUF32:
return VIDIOC_S_FBUF;
#ifdef CONFIG_COMPAT_32BIT_TIME
case VIDIOC_QUERYBUF32_TIME32:
return VIDIOC_QUERYBUF;
case VIDIOC_QBUF32_TIME32:
return VIDIOC_QBUF;
case VIDIOC_DQBUF32_TIME32:
return VIDIOC_DQBUF;
case VIDIOC_PREPARE_BUF32_TIME32:
return VIDIOC_PREPARE_BUF;
#endif
case VIDIOC_QUERYBUF32:
return VIDIOC_QUERYBUF;
case VIDIOC_QBUF32:
return VIDIOC_QBUF;
case VIDIOC_DQBUF32:
return VIDIOC_DQBUF;
case VIDIOC_CREATE_BUFS32:
return VIDIOC_CREATE_BUFS;
case VIDIOC_G_EXT_CTRLS32:
return VIDIOC_G_EXT_CTRLS;
case VIDIOC_S_EXT_CTRLS32:
return VIDIOC_S_EXT_CTRLS;
case VIDIOC_TRY_EXT_CTRLS32:
return VIDIOC_TRY_EXT_CTRLS;
case VIDIOC_PREPARE_BUF32:
return VIDIOC_PREPARE_BUF;
case VIDIOC_ENUMSTD32:
return VIDIOC_ENUMSTD;
case VIDIOC_ENUMINPUT32:
return VIDIOC_ENUMINPUT;
case VIDIOC_G_EDID32:
return VIDIOC_G_EDID;
case VIDIOC_S_EDID32:
return VIDIOC_S_EDID;
#ifdef CONFIG_X86_64
case VIDIOC_DQEVENT32:
return VIDIOC_DQEVENT;
#endif
#ifdef CONFIG_COMPAT_32BIT_TIME
case VIDIOC_DQEVENT32_TIME32:
return VIDIOC_DQEVENT;
#endif
}
return cmd;
}
int v4l2_compat_get_user(void __user *arg, void *parg, unsigned int cmd)
{
switch (cmd) {
case VIDIOC_G_FMT32:
case VIDIOC_S_FMT32:
case VIDIOC_TRY_FMT32:
return get_v4l2_format32(parg, arg);
case VIDIOC_S_FBUF32:
return get_v4l2_framebuffer32(parg, arg);
#ifdef CONFIG_COMPAT_32BIT_TIME
case VIDIOC_QUERYBUF32_TIME32:
case VIDIOC_QBUF32_TIME32:
case VIDIOC_DQBUF32_TIME32:
case VIDIOC_PREPARE_BUF32_TIME32:
return get_v4l2_buffer32_time32(parg, arg);
#endif
case VIDIOC_QUERYBUF32:
case VIDIOC_QBUF32:
case VIDIOC_DQBUF32:
case VIDIOC_PREPARE_BUF32:
return get_v4l2_buffer32(parg, arg);
case VIDIOC_G_EXT_CTRLS32:
case VIDIOC_S_EXT_CTRLS32:
case VIDIOC_TRY_EXT_CTRLS32:
return get_v4l2_ext_controls32(parg, arg);
case VIDIOC_CREATE_BUFS32:
return get_v4l2_create32(parg, arg);
case VIDIOC_ENUMSTD32:
return get_v4l2_standard32(parg, arg);
case VIDIOC_ENUMINPUT32:
return get_v4l2_input32(parg, arg);
case VIDIOC_G_EDID32:
case VIDIOC_S_EDID32:
return get_v4l2_edid32(parg, arg);
}
return 0;
}
int v4l2_compat_put_user(void __user *arg, void *parg, unsigned int cmd)
{
switch (cmd) {
case VIDIOC_G_FMT32:
case VIDIOC_S_FMT32:
case VIDIOC_TRY_FMT32:
return put_v4l2_format32(parg, arg);
case VIDIOC_G_FBUF32:
return put_v4l2_framebuffer32(parg, arg);
#ifdef CONFIG_COMPAT_32BIT_TIME
case VIDIOC_QUERYBUF32_TIME32:
case VIDIOC_QBUF32_TIME32:
case VIDIOC_DQBUF32_TIME32:
case VIDIOC_PREPARE_BUF32_TIME32:
return put_v4l2_buffer32_time32(parg, arg);
#endif
case VIDIOC_QUERYBUF32:
case VIDIOC_QBUF32:
case VIDIOC_DQBUF32:
case VIDIOC_PREPARE_BUF32:
return put_v4l2_buffer32(parg, arg);
case VIDIOC_G_EXT_CTRLS32:
case VIDIOC_S_EXT_CTRLS32:
case VIDIOC_TRY_EXT_CTRLS32:
return put_v4l2_ext_controls32(parg, arg);
case VIDIOC_CREATE_BUFS32:
return put_v4l2_create32(parg, arg);
case VIDIOC_ENUMSTD32:
return put_v4l2_standard32(parg, arg);
case VIDIOC_ENUMINPUT32:
return put_v4l2_input32(parg, arg);
case VIDIOC_G_EDID32:
case VIDIOC_S_EDID32:
return put_v4l2_edid32(parg, arg);
#ifdef CONFIG_X86_64
case VIDIOC_DQEVENT32:
return put_v4l2_event32(parg, arg);
#endif
#ifdef CONFIG_COMPAT_32BIT_TIME
case VIDIOC_DQEVENT32_TIME32:
return put_v4l2_event32_time32(parg, arg);
#endif
}
return 0;
}
int v4l2_compat_get_array_args(struct file *file, void *mbuf,
void __user *user_ptr, size_t array_size,
unsigned int cmd, void *arg)
{
int err = 0;
switch (cmd) {
case VIDIOC_G_FMT32:
case VIDIOC_S_FMT32:
case VIDIOC_TRY_FMT32: {
struct v4l2_format *f64 = arg;
struct v4l2_clip *c64 = mbuf;
struct v4l2_clip32 __user *c32 = user_ptr;
u32 clipcount = f64->fmt.win.clipcount;
if ((f64->type != V4L2_BUF_TYPE_VIDEO_OVERLAY &&
f64->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY) ||
clipcount == 0)
return 0;
if (clipcount > 2048)
return -EINVAL;
while (clipcount--) {
if (copy_from_user(c64, c32, sizeof(c64->c)))
return -EFAULT;
c64->next = NULL;
c64++;
c32++;
}
break;
}
#ifdef CONFIG_COMPAT_32BIT_TIME
case VIDIOC_QUERYBUF32_TIME32:
case VIDIOC_QBUF32_TIME32:
case VIDIOC_DQBUF32_TIME32:
case VIDIOC_PREPARE_BUF32_TIME32:
#endif
case VIDIOC_QUERYBUF32:
case VIDIOC_QBUF32:
case VIDIOC_DQBUF32:
case VIDIOC_PREPARE_BUF32: {
struct v4l2_buffer *b64 = arg;
struct v4l2_plane *p64 = mbuf;
struct v4l2_plane32 __user *p32 = user_ptr;
if (V4L2_TYPE_IS_MULTIPLANAR(b64->type)) {
u32 num_planes = b64->length;
if (num_planes == 0)
return 0;
while (num_planes--) {
err = get_v4l2_plane32(p64, p32, b64->memory);
if (err)
return err;
++p64;
++p32;
}
}
break;
}
case VIDIOC_G_EXT_CTRLS32:
case VIDIOC_S_EXT_CTRLS32:
case VIDIOC_TRY_EXT_CTRLS32: {
struct v4l2_ext_controls *ecs64 = arg;
struct v4l2_ext_control *ec64 = mbuf;
struct v4l2_ext_control32 __user *ec32 = user_ptr;
int n;
for (n = 0; n < ecs64->count; n++) {
if (copy_from_user(ec64, ec32, sizeof(*ec32)))
return -EFAULT;
if (ctrl_is_pointer(file, ec64->id)) {
compat_uptr_t p;
if (get_user(p, &ec32->string))
return -EFAULT;
ec64->string = compat_ptr(p);
}
ec32++;
ec64++;
}
break;
}
default:
if (copy_from_user(mbuf, user_ptr, array_size))
err = -EFAULT;
break;
}
return err;
}
int v4l2_compat_put_array_args(struct file *file, void __user *user_ptr,
void *mbuf, size_t array_size,
unsigned int cmd, void *arg)
{
int err = 0;
switch (cmd) {
case VIDIOC_G_FMT32:
case VIDIOC_S_FMT32:
case VIDIOC_TRY_FMT32: {
struct v4l2_format *f64 = arg;
struct v4l2_clip *c64 = mbuf;
struct v4l2_clip32 __user *c32 = user_ptr;
u32 clipcount = f64->fmt.win.clipcount;
if ((f64->type != V4L2_BUF_TYPE_VIDEO_OVERLAY &&
f64->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY) ||
clipcount == 0)
return 0;
if (clipcount > 2048)
return -EINVAL;
while (clipcount--) {
if (copy_to_user(c32, c64, sizeof(c64->c)))
return -EFAULT;
c64++;
c32++;
}
break;
}
#ifdef CONFIG_COMPAT_32BIT_TIME
case VIDIOC_QUERYBUF32_TIME32:
case VIDIOC_QBUF32_TIME32:
case VIDIOC_DQBUF32_TIME32:
case VIDIOC_PREPARE_BUF32_TIME32:
#endif
case VIDIOC_QUERYBUF32:
case VIDIOC_QBUF32:
case VIDIOC_DQBUF32:
case VIDIOC_PREPARE_BUF32: {
struct v4l2_buffer *b64 = arg;
struct v4l2_plane *p64 = mbuf;
struct v4l2_plane32 __user *p32 = user_ptr;
if (V4L2_TYPE_IS_MULTIPLANAR(b64->type)) {
u32 num_planes = b64->length;
if (num_planes == 0)
return 0;
while (num_planes--) {
err = put_v4l2_plane32(p64, p32, b64->memory);
if (err)
return err;
++p64;
++p32;
}
}
break;
}
case VIDIOC_G_EXT_CTRLS32:
case VIDIOC_S_EXT_CTRLS32:
case VIDIOC_TRY_EXT_CTRLS32: {
struct v4l2_ext_controls *ecs64 = arg;
struct v4l2_ext_control *ec64 = mbuf;
struct v4l2_ext_control32 __user *ec32 = user_ptr;
int n;
for (n = 0; n < ecs64->count; n++) {
unsigned int size = sizeof(*ec32);
/*
* Do not modify the pointer when copying a pointer
* control. The contents of the pointer was changed,
* not the pointer itself.
* The structures are otherwise compatible.
*/
if (ctrl_is_pointer(file, ec64->id))
size -= sizeof(ec32->value64);
if (copy_to_user(ec32, ec64, size))
return -EFAULT;
ec32++;
ec64++;
}
break;
}
default:
if (copy_to_user(user_ptr, mbuf, array_size))
err = -EFAULT;
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 (!video_is_registered(vdev))
return -ENODEV;
if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
ret = file->f_op->unlocked_ioctl(file, cmd,
(unsigned long)compat_ptr(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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