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media: v4l2: prepare compat-ioctl rework
The v4l2-compat-ioctl32() currently takes an extra round trip through user space pointers when converting the data structure formats. In particular, this involves using the compat_alloc_user_space() and copy_in_user() helpers that often lead to worse compat handlers compared to using in_compat_syscall() checks when copying the data. The native implementation already gained a simpler method to deal with the conversion for the time32 conversion. Hook into the same places to provide a location for reading and writing user space data from inside of the generic video_usercopy() helper. Hans Verkuil rewrote the video_get_user() function here to simplify the zeroing of the extra input fields and fixed a couple of bugs in the original implementation. [hverkuil: fix: CHECK: Please don't use multiple blank lines] Co-developed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Arnd Bergmann
Mauro Carvalho Chehab
parent
3650b228f8
commit
8dbcc3fa38
@ -1414,6 +1414,59 @@ static int put_v4l2_edid32(struct v4l2_edid __user *p64,
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#define VIDIOC_G_OUTPUT32 _IOR ('V', 46, s32)
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#define VIDIOC_S_OUTPUT32 _IOWR('V', 47, s32)
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unsigned int v4l2_compat_translate_cmd(unsigned int cmd)
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{
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switch (cmd) {
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}
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return cmd;
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}
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int v4l2_compat_get_user(void __user *arg, void *parg, unsigned int cmd)
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{
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switch (cmd) {
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}
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return 0;
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}
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int v4l2_compat_put_user(void __user *arg, void *parg, unsigned int cmd)
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{
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switch (cmd) {
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}
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return 0;
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}
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int v4l2_compat_get_array_args(struct file *file, void *mbuf,
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void __user *user_ptr, size_t array_size,
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unsigned int cmd, void *arg)
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{
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int err = 0;
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switch (cmd) {
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default:
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if (copy_from_user(mbuf, user_ptr, array_size))
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err = -EFAULT;
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break;
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}
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return err;
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}
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int v4l2_compat_put_array_args(struct file *file, void __user *user_ptr,
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void *mbuf, size_t array_size,
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unsigned int cmd, void *arg)
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{
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int err = 0;
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switch (cmd) {
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default:
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if (copy_to_user(user_ptr, mbuf, array_size))
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err = -EFAULT;
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break;
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}
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return err;
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}
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/**
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* alloc_userspace() - Allocates a 64-bits userspace pointer compatible
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* for calling the native 64-bits version of an ioctl.
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@ -8,6 +8,7 @@
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* Mauro Carvalho Chehab <mchehab@kernel.org> (version 2)
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*/
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#include <linux/compat.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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@ -3104,14 +3105,18 @@ static unsigned int video_translate_cmd(unsigned int cmd)
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return VIDIOC_PREPARE_BUF;
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#endif
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}
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if (in_compat_syscall())
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return v4l2_compat_translate_cmd(cmd);
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return cmd;
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}
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static int video_get_user(void __user *arg, void *parg, unsigned int cmd,
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static int video_get_user(void __user *arg, void *parg,
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unsigned int real_cmd, unsigned int cmd,
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bool *always_copy)
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{
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unsigned int n = _IOC_SIZE(cmd);
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unsigned int n = _IOC_SIZE(real_cmd);
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int err = 0;
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if (!(_IOC_DIR(cmd) & _IOC_WRITE)) {
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/* read-only ioctl */
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@ -3119,73 +3124,82 @@ static int video_get_user(void __user *arg, void *parg, unsigned int cmd,
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return 0;
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}
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switch (cmd) {
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#ifdef CONFIG_COMPAT_32BIT_TIME
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case VIDIOC_QUERYBUF_TIME32:
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case VIDIOC_QBUF_TIME32:
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case VIDIOC_DQBUF_TIME32:
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case VIDIOC_PREPARE_BUF_TIME32: {
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struct v4l2_buffer_time32 vb32;
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struct v4l2_buffer *vb = parg;
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/*
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* In some cases, only a few fields are used as input,
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* i.e. when the app sets "index" and then the driver
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* fills in the rest of the structure for the thing
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* with that index. We only need to copy up the first
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* non-input field.
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*/
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if (v4l2_is_known_ioctl(real_cmd)) {
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u32 flags = v4l2_ioctls[_IOC_NR(real_cmd)].flags;
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if (copy_from_user(&vb32, arg, sizeof(vb32)))
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return -EFAULT;
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*vb = (struct v4l2_buffer) {
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.index = vb32.index,
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.type = vb32.type,
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.bytesused = vb32.bytesused,
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.flags = vb32.flags,
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.field = vb32.field,
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.timestamp.tv_sec = vb32.timestamp.tv_sec,
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.timestamp.tv_usec = vb32.timestamp.tv_usec,
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.timecode = vb32.timecode,
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.sequence = vb32.sequence,
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.memory = vb32.memory,
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.m.userptr = vb32.m.userptr,
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.length = vb32.length,
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.request_fd = vb32.request_fd,
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};
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if (cmd == VIDIOC_QUERYBUF_TIME32)
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vb->request_fd = 0;
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break;
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if (flags & INFO_FL_CLEAR_MASK)
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n = (flags & INFO_FL_CLEAR_MASK) >> 16;
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*always_copy = flags & INFO_FL_ALWAYS_COPY;
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}
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#endif
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default:
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/*
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* In some cases, only a few fields are used as input,
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* i.e. when the app sets "index" and then the driver
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* fills in the rest of the structure for the thing
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* with that index. We only need to copy up the first
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* non-input field.
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*/
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if (v4l2_is_known_ioctl(cmd)) {
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u32 flags = v4l2_ioctls[_IOC_NR(cmd)].flags;
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if (flags & INFO_FL_CLEAR_MASK)
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n = (flags & INFO_FL_CLEAR_MASK) >> 16;
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*always_copy = flags & INFO_FL_ALWAYS_COPY;
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}
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if (cmd == real_cmd) {
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if (copy_from_user(parg, (void __user *)arg, n))
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return -EFAULT;
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err = -EFAULT;
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} else if (in_compat_syscall()) {
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err = v4l2_compat_get_user(arg, parg, cmd);
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} else {
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switch (cmd) {
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#ifdef CONFIG_COMPAT_32BIT_TIME
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case VIDIOC_QUERYBUF_TIME32:
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case VIDIOC_QBUF_TIME32:
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case VIDIOC_DQBUF_TIME32:
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case VIDIOC_PREPARE_BUF_TIME32: {
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struct v4l2_buffer_time32 vb32;
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struct v4l2_buffer *vb = parg;
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/* zero out anything we don't copy from userspace */
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if (n < _IOC_SIZE(cmd))
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memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
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break;
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if (copy_from_user(&vb32, arg, sizeof(vb32)))
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return -EFAULT;
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*vb = (struct v4l2_buffer) {
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.index = vb32.index,
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.type = vb32.type,
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.bytesused = vb32.bytesused,
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.flags = vb32.flags,
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.field = vb32.field,
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.timestamp.tv_sec = vb32.timestamp.tv_sec,
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.timestamp.tv_usec = vb32.timestamp.tv_usec,
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.timecode = vb32.timecode,
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.sequence = vb32.sequence,
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.memory = vb32.memory,
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.m.userptr = vb32.m.userptr,
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.length = vb32.length,
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.request_fd = vb32.request_fd,
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};
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break;
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}
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#endif
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}
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}
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return 0;
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/* zero out anything we don't copy from userspace */
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if (!err && n < _IOC_SIZE(real_cmd))
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memset((u8 *)parg + n, 0, _IOC_SIZE(real_cmd) - n);
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return err;
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}
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static int video_put_user(void __user *arg, void *parg, unsigned int cmd)
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static int video_put_user(void __user *arg, void *parg,
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unsigned int real_cmd, unsigned int cmd)
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{
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if (!(_IOC_DIR(cmd) & _IOC_READ))
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return 0;
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if (cmd == real_cmd) {
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/* Copy results into user buffer */
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if (copy_to_user(arg, parg, _IOC_SIZE(cmd)))
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return -EFAULT;
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return 0;
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}
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if (in_compat_syscall())
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return v4l2_compat_put_user(arg, parg, cmd);
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switch (cmd) {
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#ifdef CONFIG_COMPAT_32BIT_TIME
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case VIDIOC_DQEVENT_TIME32: {
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@ -3236,11 +3250,6 @@ static int video_put_user(void __user *arg, void *parg, unsigned int cmd)
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break;
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}
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#endif
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default:
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/* Copy results into user buffer */
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if (copy_to_user(arg, parg, _IOC_SIZE(cmd)))
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return -EFAULT;
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break;
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}
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return 0;
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@ -3274,8 +3283,8 @@ video_usercopy(struct file *file, unsigned int orig_cmd, unsigned long arg,
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parg = mbuf;
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}
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err = video_get_user((void __user *)arg, parg, orig_cmd,
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&always_copy);
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err = video_get_user((void __user *)arg, parg, cmd,
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orig_cmd, &always_copy);
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if (err)
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goto out;
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}
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@ -3297,7 +3306,14 @@ video_usercopy(struct file *file, unsigned int orig_cmd, unsigned long arg,
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if (NULL == mbuf)
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goto out_array_args;
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err = -EFAULT;
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if (copy_from_user(mbuf, user_ptr, array_size))
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if (in_compat_syscall())
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err = v4l2_compat_get_array_args(file, mbuf, user_ptr,
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array_size, orig_cmd,
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parg);
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else
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err = copy_from_user(mbuf, user_ptr, array_size) ?
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-EFAULT : 0;
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if (err)
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goto out_array_args;
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*kernel_ptr = mbuf;
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}
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@ -3318,8 +3334,17 @@ video_usercopy(struct file *file, unsigned int orig_cmd, unsigned long arg,
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if (has_array_args) {
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*kernel_ptr = (void __force *)user_ptr;
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if (copy_to_user(user_ptr, mbuf, array_size))
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if (in_compat_syscall()) {
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int put_err;
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put_err = v4l2_compat_put_array_args(file, user_ptr, mbuf,
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array_size, orig_cmd,
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parg);
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if (put_err)
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err = put_err;
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} else if (copy_to_user(user_ptr, mbuf, array_size)) {
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err = -EFAULT;
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}
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goto out_array_args;
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}
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/*
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@ -3330,7 +3355,7 @@ video_usercopy(struct file *file, unsigned int orig_cmd, unsigned long arg,
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goto out;
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out_array_args:
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if (video_put_user((void __user *)arg, parg, orig_cmd))
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if (video_put_user((void __user *)arg, parg, cmd, orig_cmd))
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err = -EFAULT;
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out:
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kvfree(mbuf);
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@ -686,6 +686,16 @@ long int v4l2_compat_ioctl32(struct file *file, unsigned int cmd,
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unsigned long arg);
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#endif
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unsigned int v4l2_compat_translate_cmd(unsigned int cmd);
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int v4l2_compat_get_user(void __user *arg, void *parg, unsigned int cmd);
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int v4l2_compat_put_user(void __user *arg, void *parg, unsigned int cmd);
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int v4l2_compat_get_array_args(struct file *file, void *mbuf,
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void __user *user_ptr, size_t array_size,
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unsigned int cmd, void *arg);
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int v4l2_compat_put_array_args(struct file *file, void __user *user_ptr,
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void *mbuf, size_t array_size,
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unsigned int cmd, void *arg);
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/**
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* typedef v4l2_kioctl - Typedef used to pass an ioctl handler.
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*
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