^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/exportfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/fs_struct.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/fsnotify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "mount.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static long do_sys_name_to_handle(struct path *path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct file_handle __user *ufh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) int __user *mnt_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) long retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct file_handle f_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) int handle_dwords, handle_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct file_handle *handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * We need to make sure whether the file system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * support decoding of the file handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) if (!path->dentry->d_sb->s_export_op ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) !path->dentry->d_sb->s_export_op->fh_to_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) if (copy_from_user(&f_handle, ufh, sizeof(struct file_handle)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) if (f_handle.handle_bytes > MAX_HANDLE_SZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) handle = kmalloc(sizeof(struct file_handle) + f_handle.handle_bytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (!handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* convert handle size to multiple of sizeof(u32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) handle_dwords = f_handle.handle_bytes >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /* we ask for a non connected handle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) retval = exportfs_encode_fh(path->dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) (struct fid *)handle->f_handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) &handle_dwords, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) handle->handle_type = retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* convert handle size to bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) handle_bytes = handle_dwords * sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) handle->handle_bytes = handle_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if ((handle->handle_bytes > f_handle.handle_bytes) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) (retval == FILEID_INVALID) || (retval == -ENOSPC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* As per old exportfs_encode_fh documentation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * we could return ENOSPC to indicate overflow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * But file system returned 255 always. So handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * both the values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * set the handle size to zero so we copy only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * non variable part of the file_handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) handle_bytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) retval = -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* copy the mount id */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (put_user(real_mount(path->mnt)->mnt_id, mnt_id) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) copy_to_user(ufh, handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) sizeof(struct file_handle) + handle_bytes))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) retval = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) kfree(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * sys_name_to_handle_at: convert name to handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * @dfd: directory relative to which name is interpreted if not absolute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * @name: name that should be converted to handle.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * @handle: resulting file handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * @mnt_id: mount id of the file system containing the file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * @flag: flag value to indicate whether to follow symlink or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * @handle->handle_size indicate the space available to store the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * variable part of the file handle in bytes. If there is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * enough space, the field is updated to return the minimum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * value required.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) SYSCALL_DEFINE5(name_to_handle_at, int, dfd, const char __user *, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct file_handle __user *, handle, int __user *, mnt_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) int, flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) int lookup_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if ((flag & ~(AT_SYMLINK_FOLLOW | AT_EMPTY_PATH)) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) lookup_flags = (flag & AT_SYMLINK_FOLLOW) ? LOOKUP_FOLLOW : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (flag & AT_EMPTY_PATH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) lookup_flags |= LOOKUP_EMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) err = user_path_at(dfd, name, lookup_flags, &path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) err = do_sys_name_to_handle(&path, handle, mnt_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) path_put(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static struct vfsmount *get_vfsmount_from_fd(int fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct vfsmount *mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (fd == AT_FDCWD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct fs_struct *fs = current->fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) spin_lock(&fs->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) mnt = mntget(fs->pwd.mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) spin_unlock(&fs->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct fd f = fdget(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (!f.file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return ERR_PTR(-EBADF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) mnt = mntget(f.file->f_path.mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static int vfs_dentry_acceptable(void *context, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static int do_handle_to_path(int mountdirfd, struct file_handle *handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct path *path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) int handle_dwords;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) path->mnt = get_vfsmount_from_fd(mountdirfd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (IS_ERR(path->mnt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) retval = PTR_ERR(path->mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* change the handle size to multiple of sizeof(u32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) handle_dwords = handle->handle_bytes >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) path->dentry = exportfs_decode_fh(path->mnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) (struct fid *)handle->f_handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) handle_dwords, handle->handle_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) vfs_dentry_acceptable, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (IS_ERR(path->dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) retval = PTR_ERR(path->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) goto out_mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) out_mnt:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) mntput(path->mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int handle_to_path(int mountdirfd, struct file_handle __user *ufh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct path *path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) int retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct file_handle f_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct file_handle *handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * With handle we don't look at the execute bit on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * the directory. Ideally we would like CAP_DAC_SEARCH.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * But we don't have that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (!capable(CAP_DAC_READ_SEARCH)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) retval = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (copy_from_user(&f_handle, ufh, sizeof(struct file_handle))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) retval = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if ((f_handle.handle_bytes > MAX_HANDLE_SZ) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) (f_handle.handle_bytes == 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) handle = kmalloc(sizeof(struct file_handle) + f_handle.handle_bytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (!handle) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* copy the full handle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) *handle = f_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (copy_from_user(&handle->f_handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) &ufh->f_handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) f_handle.handle_bytes)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) retval = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) goto out_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) retval = do_handle_to_path(mountdirfd, handle, path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) out_handle:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) kfree(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static long do_handle_open(int mountdirfd, struct file_handle __user *ufh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) int open_flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) long retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct file *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) retval = handle_to_path(mountdirfd, ufh, &path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) fd = get_unused_fd_flags(open_flag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) path_put(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) file = file_open_root(path.dentry, path.mnt, "", open_flag, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (IS_ERR(file)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) put_unused_fd(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) retval = PTR_ERR(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) retval = fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) fsnotify_open(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) fd_install(fd, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) path_put(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * sys_open_by_handle_at: Open the file handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * @mountdirfd: directory file descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * @handle: file handle to be opened
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * @flags: open flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * @mountdirfd indicate the directory file descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * of the mount point. file handle is decoded relative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * to the vfsmount pointed by the @mountdirfd. @flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * value is same as the open(2) flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct file_handle __user *, handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) int, flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (force_o_largefile())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) flags |= O_LARGEFILE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) ret = do_handle_open(mountdirfd, handle, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * doesn't set the O_LARGEFILE flag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) struct file_handle __user *, handle, int, flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return do_handle_open(mountdirfd, handle, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags