diff options
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-compat-ioctl32.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 1799 |
1 files changed, 1799 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c new file mode 100644 index 000000000..a99e82ec9 --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -0,0 +1,1799 @@ +// 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]; +}; + +/* + * 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; +}; + +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; +}; + +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 bufsize_v4l2_buffer_time32(struct v4l2_buffer32_time32 __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 get_v4l2_buffer32_time32(struct v4l2_buffer_time32 __user *p64, + struct v4l2_buffer32_time32 __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; +} + +static int put_v4l2_buffer32_time32(struct v4l2_buffer_time32 __user *p64, + struct v4l2_buffer32_time32 __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; +} + +#ifdef CONFIG_X86_64 +/* + * x86 is the only compat architecture with different struct alignment + * between 32-bit and 64-bit tasks. + * + * On all other architectures, v4l2_event32 and v4l2_event32_time32 are + * the same as v4l2_event and v4l2_event_time32, so we can use the native + * handlers, converting v4l2_event to v4l2_event_time32 if necessary. + */ +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]; +}; + +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(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; +} + +static int put_v4l2_event32_time32(struct v4l2_event_time32 __user *p64, + struct v4l2_event32_time32 __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; +} +#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 __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_QUERYBUF32_TIME32 _IOWR('V', 9, struct v4l2_buffer32_time32) +#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_QBUF32_TIME32 _IOWR('V', 15, struct v4l2_buffer32_time32) +#define VIDIOC_DQBUF32 _IOWR('V', 17, struct v4l2_buffer32) +#define VIDIOC_DQBUF32_TIME32 _IOWR('V', 17, struct v4l2_buffer32_time32) +#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_DQEVENT32_TIME32 _IOR ('V', 89, struct v4l2_event32_time32) +#define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32) +#define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32) +#define VIDIOC_PREPARE_BUF32_TIME32 _IOWR('V', 93, struct v4l2_buffer32_time32) + +#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_QUERYBUF32_TIME32: ncmd = VIDIOC_QUERYBUF_TIME32; 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_QBUF32_TIME32: ncmd = VIDIOC_QBUF_TIME32; break; + case VIDIOC_DQBUF32: ncmd = VIDIOC_DQBUF; break; + case VIDIOC_DQBUF32_TIME32: ncmd = VIDIOC_DQBUF_TIME32; 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; +#ifdef CONFIG_X86_64 + case VIDIOC_DQEVENT32: ncmd = VIDIOC_DQEVENT; break; + case VIDIOC_DQEVENT32_TIME32: ncmd = VIDIOC_DQEVENT_TIME32; break; +#endif + 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_PREPARE_BUF32_TIME32: ncmd = VIDIOC_PREPARE_BUF_TIME32; 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_PREPARE_BUF32_TIME32: + case VIDIOC_QUERYBUF32_TIME32: + case VIDIOC_QBUF32_TIME32: + case VIDIOC_DQBUF32_TIME32: + err = bufsize_v4l2_buffer_time32(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_time32(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; +#ifdef CONFIG_X86_64 + case VIDIOC_DQEVENT32: + err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64); + compatible_arg = 0; + break; + case VIDIOC_DQEVENT32_TIME32: + err = alloc_userspace(sizeof(struct v4l2_event_time32), 0, &new_p64); + compatible_arg = 0; + break; +#endif + } + 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; + +#ifdef CONFIG_X86_64 + case VIDIOC_DQEVENT32: + err = put_v4l2_event32(new_p64, p32); + break; + + case VIDIOC_DQEVENT32_TIME32: + err = put_v4l2_event32_time32(new_p64, p32); + break; +#endif + + 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_PREPARE_BUF32_TIME32: + case VIDIOC_QUERYBUF32_TIME32: + case VIDIOC_QBUF32_TIME32: + case VIDIOC_DQBUF32_TIME32: + err = put_v4l2_buffer32_time32(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); |