diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 196 |
1 files changed, 2 insertions, 194 deletions
diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c index b51fa680b4cf..58d29284db13 100644 --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -23,103 +23,6 @@ #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. * @@ -1307,102 +1210,6 @@ int v4l2_compat_put_array_args(struct file *file, void __user *user_ptr, } /** - * 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) { - 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) { - } - 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; - - /* - * 5. Copy the data returned at the 64 bits userspace pointer to - * the original 32 bits structure. - */ - switch (cmd) { - } - return err; -} - -/** * v4l2_compat_ioctl32() - Handles a compat32 ioctl call * * @file: pointer to &struct file with the file handler @@ -1425,7 +1232,8 @@ long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg) return ret; if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE) - ret = do_video_ioctl(file, cmd, arg); + 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); |