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-rw-r--r--fs/ntfs3/namei.c620
1 files changed, 620 insertions, 0 deletions
diff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c
new file mode 100644
index 0000000000..eedacf94ed
--- /dev/null
+++ b/fs/ntfs3/namei.c
@@ -0,0 +1,620 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *
+ * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
+ *
+ */
+
+#include <linux/fs.h>
+#include <linux/nls.h>
+#include <linux/ctype.h>
+#include <linux/posix_acl.h>
+
+#include "debug.h"
+#include "ntfs.h"
+#include "ntfs_fs.h"
+
+/*
+ * fill_name_de - Format NTFS_DE in @buf.
+ */
+int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name,
+ const struct cpu_str *uni)
+{
+ int err;
+ struct NTFS_DE *e = buf;
+ u16 data_size;
+ struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1);
+
+#ifndef CONFIG_NTFS3_64BIT_CLUSTER
+ e->ref.high = fname->home.high = 0;
+#endif
+ if (uni) {
+#ifdef __BIG_ENDIAN
+ int ulen = uni->len;
+ __le16 *uname = fname->name;
+ const u16 *name_cpu = uni->name;
+
+ while (ulen--)
+ *uname++ = cpu_to_le16(*name_cpu++);
+#else
+ memcpy(fname->name, uni->name, uni->len * sizeof(u16));
+#endif
+ fname->name_len = uni->len;
+
+ } else {
+ /* Convert input string to unicode. */
+ err = ntfs_nls_to_utf16(sbi, name->name, name->len,
+ (struct cpu_str *)&fname->name_len,
+ NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN);
+ if (err < 0)
+ return err;
+ }
+
+ fname->type = FILE_NAME_POSIX;
+ data_size = fname_full_size(fname);
+
+ e->size = cpu_to_le16(ALIGN(data_size, 8) + sizeof(struct NTFS_DE));
+ e->key_size = cpu_to_le16(data_size);
+ e->flags = 0;
+ e->res = 0;
+
+ return 0;
+}
+
+/*
+ * ntfs_lookup - inode_operations::lookup
+ */
+static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry,
+ u32 flags)
+{
+ struct ntfs_inode *ni = ntfs_i(dir);
+ struct cpu_str *uni = __getname();
+ struct inode *inode;
+ int err;
+
+ if (!uni)
+ inode = ERR_PTR(-ENOMEM);
+ else {
+ err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
+ dentry->d_name.len, uni, NTFS_NAME_LEN,
+ UTF16_HOST_ENDIAN);
+ if (err < 0)
+ inode = ERR_PTR(err);
+ else {
+ ni_lock(ni);
+ inode = dir_search_u(dir, uni, NULL);
+ ni_unlock(ni);
+ }
+ __putname(uni);
+ }
+
+ /*
+ * Check for a null pointer
+ * If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL.
+ * This causes null pointer dereference in d_splice_alias().
+ */
+ if (!IS_ERR_OR_NULL(inode) && !inode->i_op) {
+ iput(inode);
+ inode = ERR_PTR(-EINVAL);
+ }
+
+ return d_splice_alias(inode, dentry);
+}
+
+/*
+ * ntfs_create - inode_operations::create
+ */
+static int ntfs_create(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
+{
+ struct inode *inode;
+
+ inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG | mode, 0,
+ NULL, 0, NULL);
+
+ return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+}
+
+/*
+ * ntfs_mknod
+ *
+ * inode_operations::mknod
+ */
+static int ntfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+ struct inode *inode;
+
+ inode = ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev, NULL, 0,
+ NULL);
+
+ return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+}
+
+/*
+ * ntfs_link - inode_operations::link
+ */
+static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de)
+{
+ int err;
+ struct inode *inode = d_inode(ode);
+ struct ntfs_inode *ni = ntfs_i(inode);
+
+ if (S_ISDIR(inode->i_mode))
+ return -EPERM;
+
+ if (inode->i_nlink >= NTFS_LINK_MAX)
+ return -EMLINK;
+
+ ni_lock_dir(ntfs_i(dir));
+ if (inode != dir)
+ ni_lock(ni);
+
+ inc_nlink(inode);
+ ihold(inode);
+
+ err = ntfs_link_inode(inode, de);
+
+ if (!err) {
+ dir->i_mtime = inode_set_ctime_to_ts(
+ inode, inode_set_ctime_current(dir));
+ mark_inode_dirty(inode);
+ mark_inode_dirty(dir);
+ d_instantiate(de, inode);
+ } else {
+ drop_nlink(inode);
+ iput(inode);
+ }
+
+ if (inode != dir)
+ ni_unlock(ni);
+ ni_unlock(ntfs_i(dir));
+
+ return err;
+}
+
+/*
+ * ntfs_unlink - inode_operations::unlink
+ */
+static int ntfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct ntfs_inode *ni = ntfs_i(dir);
+ int err;
+
+ ni_lock_dir(ni);
+
+ err = ntfs_unlink_inode(dir, dentry);
+
+ ni_unlock(ni);
+
+ return err;
+}
+
+/*
+ * ntfs_symlink - inode_operations::symlink
+ */
+static int ntfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, const char *symname)
+{
+ u32 size = strlen(symname);
+ struct inode *inode;
+
+ inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK | 0777, 0,
+ symname, size, NULL);
+
+ return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+}
+
+/*
+ * ntfs_mkdir- inode_operations::mkdir
+ */
+static int ntfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode)
+{
+ struct inode *inode;
+
+ inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR | mode, 0,
+ NULL, 0, NULL);
+
+ return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+}
+
+/*
+ * ntfs_rmdir - inode_operations::rmdir
+ */
+static int ntfs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct ntfs_inode *ni = ntfs_i(dir);
+ int err;
+
+ ni_lock_dir(ni);
+
+ err = ntfs_unlink_inode(dir, dentry);
+
+ ni_unlock(ni);
+
+ return err;
+}
+
+/*
+ * ntfs_rename - inode_operations::rename
+ */
+static int ntfs_rename(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, struct inode *new_dir,
+ struct dentry *new_dentry, u32 flags)
+{
+ int err;
+ struct super_block *sb = dir->i_sb;
+ struct ntfs_sb_info *sbi = sb->s_fs_info;
+ struct ntfs_inode *dir_ni = ntfs_i(dir);
+ struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
+ struct inode *inode = d_inode(dentry);
+ struct ntfs_inode *ni = ntfs_i(inode);
+ struct inode *new_inode = d_inode(new_dentry);
+ struct NTFS_DE *de, *new_de;
+ bool is_same, is_bad;
+ /*
+ * de - memory of PATH_MAX bytes:
+ * [0-1024) - original name (dentry->d_name)
+ * [1024-2048) - paired to original name, usually DOS variant of dentry->d_name
+ * [2048-3072) - new name (new_dentry->d_name)
+ */
+ static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
+ static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
+ 1024);
+ static_assert(PATH_MAX >= 4 * 1024);
+
+ if (flags & ~RENAME_NOREPLACE)
+ return -EINVAL;
+
+ is_same = dentry->d_name.len == new_dentry->d_name.len &&
+ !memcmp(dentry->d_name.name, new_dentry->d_name.name,
+ dentry->d_name.len);
+
+ if (is_same && dir == new_dir) {
+ /* Nothing to do. */
+ return 0;
+ }
+
+ if (ntfs_is_meta_file(sbi, inode->i_ino)) {
+ /* Should we print an error? */
+ return -EINVAL;
+ }
+
+ if (new_inode) {
+ /* Target name exists. Unlink it. */
+ dget(new_dentry);
+ ni_lock_dir(new_dir_ni);
+ err = ntfs_unlink_inode(new_dir, new_dentry);
+ ni_unlock(new_dir_ni);
+ dput(new_dentry);
+ if (err)
+ return err;
+ }
+
+ /* Allocate PATH_MAX bytes. */
+ de = __getname();
+ if (!de)
+ return -ENOMEM;
+
+ /* Translate dentry->d_name into unicode form. */
+ err = fill_name_de(sbi, de, &dentry->d_name, NULL);
+ if (err < 0)
+ goto out;
+
+ if (is_same) {
+ /* Reuse 'de'. */
+ new_de = de;
+ } else {
+ /* Translate new_dentry->d_name into unicode form. */
+ new_de = Add2Ptr(de, 2048);
+ err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
+ if (err < 0)
+ goto out;
+ }
+
+ ni_lock_dir(dir_ni);
+ ni_lock(ni);
+ if (dir_ni != new_dir_ni)
+ ni_lock_dir2(new_dir_ni);
+
+ is_bad = false;
+ err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad);
+ if (is_bad) {
+ /* Restore after failed rename failed too. */
+ _ntfs_bad_inode(inode);
+ } else if (!err) {
+ simple_rename_timestamp(dir, dentry, new_dir, new_dentry);
+ mark_inode_dirty(inode);
+ mark_inode_dirty(dir);
+ if (dir != new_dir)
+ mark_inode_dirty(new_dir);
+
+ if (IS_DIRSYNC(dir))
+ ntfs_sync_inode(dir);
+
+ if (IS_DIRSYNC(new_dir))
+ ntfs_sync_inode(inode);
+ }
+
+ if (dir_ni != new_dir_ni)
+ ni_unlock(new_dir_ni);
+ ni_unlock(ni);
+ ni_unlock(dir_ni);
+out:
+ __putname(de);
+ return err;
+}
+
+/*
+ * ntfs_atomic_open
+ *
+ * inode_operations::atomic_open
+ */
+static int ntfs_atomic_open(struct inode *dir, struct dentry *dentry,
+ struct file *file, u32 flags, umode_t mode)
+{
+ int err;
+ struct inode *inode;
+ struct ntfs_fnd *fnd = NULL;
+ struct ntfs_inode *ni = ntfs_i(dir);
+ struct dentry *d = NULL;
+ struct cpu_str *uni = __getname();
+ bool locked = false;
+
+ if (!uni)
+ return -ENOMEM;
+
+ err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
+ dentry->d_name.len, uni, NTFS_NAME_LEN,
+ UTF16_HOST_ENDIAN);
+ if (err < 0)
+ goto out;
+
+#ifdef CONFIG_NTFS3_FS_POSIX_ACL
+ if (IS_POSIXACL(dir)) {
+ /*
+ * Load in cache current acl to avoid ni_lock(dir):
+ * ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
+ * ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
+ */
+ struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
+
+ if (IS_ERR(p)) {
+ err = PTR_ERR(p);
+ goto out;
+ }
+ posix_acl_release(p);
+ }
+#endif
+
+ if (d_in_lookup(dentry)) {
+ ni_lock_dir(ni);
+ locked = true;
+ fnd = fnd_get();
+ if (!fnd) {
+ err = -ENOMEM;
+ goto out1;
+ }
+
+ d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
+ if (IS_ERR(d)) {
+ err = PTR_ERR(d);
+ d = NULL;
+ goto out2;
+ }
+
+ if (d)
+ dentry = d;
+ }
+
+ if (!(flags & O_CREAT) || d_really_is_positive(dentry)) {
+ err = finish_no_open(file, d);
+ goto out2;
+ }
+
+ file->f_mode |= FMODE_CREATED;
+
+ /*
+ * fnd contains tree's path to insert to.
+ * If fnd is not NULL then dir is locked.
+ */
+ inode = ntfs_create_inode(mnt_idmap(file->f_path.mnt), dir, dentry, uni,
+ mode, 0, NULL, 0, fnd);
+ err = IS_ERR(inode) ? PTR_ERR(inode) :
+ finish_open(file, dentry, ntfs_file_open);
+ dput(d);
+
+out2:
+ fnd_put(fnd);
+out1:
+ if (locked)
+ ni_unlock(ni);
+out:
+ __putname(uni);
+ return err;
+}
+
+struct dentry *ntfs3_get_parent(struct dentry *child)
+{
+ struct inode *inode = d_inode(child);
+ struct ntfs_inode *ni = ntfs_i(inode);
+
+ struct ATTR_LIST_ENTRY *le = NULL;
+ struct ATTRIB *attr = NULL;
+ struct ATTR_FILE_NAME *fname;
+
+ while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
+ NULL))) {
+ fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
+ if (!fname)
+ continue;
+
+ return d_obtain_alias(
+ ntfs_iget5(inode->i_sb, &fname->home, NULL));
+ }
+
+ return ERR_PTR(-ENOENT);
+}
+
+/*
+ * dentry_operations::d_hash
+ */
+static int ntfs_d_hash(const struct dentry *dentry, struct qstr *name)
+{
+ struct ntfs_sb_info *sbi;
+ const char *n = name->name;
+ unsigned int len = name->len;
+ unsigned long hash;
+ struct cpu_str *uni;
+ unsigned int c;
+ int err;
+
+ /* First try fast implementation. */
+ hash = init_name_hash(dentry);
+
+ for (;;) {
+ if (!len--) {
+ name->hash = end_name_hash(hash);
+ return 0;
+ }
+
+ c = *n++;
+ if (c >= 0x80)
+ break;
+
+ hash = partial_name_hash(toupper(c), hash);
+ }
+
+ /*
+ * Try slow way with current upcase table
+ */
+ uni = __getname();
+ if (!uni)
+ return -ENOMEM;
+
+ sbi = dentry->d_sb->s_fs_info;
+
+ err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
+ UTF16_HOST_ENDIAN);
+ if (err < 0)
+ goto out;
+
+ if (!err) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ hash = ntfs_names_hash(uni->name, uni->len, sbi->upcase,
+ init_name_hash(dentry));
+ name->hash = end_name_hash(hash);
+ err = 0;
+
+out:
+ __putname(uni);
+ return err;
+}
+
+/*
+ * dentry_operations::d_compare
+ */
+static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1,
+ const char *str, const struct qstr *name)
+{
+ struct ntfs_sb_info *sbi;
+ int ret;
+ const char *n1 = str;
+ const char *n2 = name->name;
+ unsigned int len2 = name->len;
+ unsigned int lm = min(len1, len2);
+ unsigned char c1, c2;
+ struct cpu_str *uni1;
+ struct le_str *uni2;
+
+ /* First try fast implementation. */
+ for (;;) {
+ if (!lm--)
+ return len1 != len2;
+
+ if ((c1 = *n1++) == (c2 = *n2++))
+ continue;
+
+ if (c1 >= 0x80 || c2 >= 0x80)
+ break;
+
+ if (toupper(c1) != toupper(c2))
+ return 1;
+ }
+
+ /*
+ * Try slow way with current upcase table
+ */
+ sbi = dentry->d_sb->s_fs_info;
+ uni1 = __getname();
+ if (!uni1)
+ return -ENOMEM;
+
+ ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN,
+ UTF16_HOST_ENDIAN);
+ if (ret < 0)
+ goto out;
+
+ if (!ret) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ uni2 = Add2Ptr(uni1, 2048);
+
+ ret = ntfs_nls_to_utf16(sbi, name->name, name->len,
+ (struct cpu_str *)uni2, NTFS_NAME_LEN,
+ UTF16_LITTLE_ENDIAN);
+ if (ret < 0)
+ goto out;
+
+ if (!ret) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = !ntfs_cmp_names_cpu(uni1, uni2, sbi->upcase, false) ? 0 : 1;
+
+out:
+ __putname(uni1);
+ return ret;
+}
+
+// clang-format off
+const struct inode_operations ntfs_dir_inode_operations = {
+ .lookup = ntfs_lookup,
+ .create = ntfs_create,
+ .link = ntfs_link,
+ .unlink = ntfs_unlink,
+ .symlink = ntfs_symlink,
+ .mkdir = ntfs_mkdir,
+ .rmdir = ntfs_rmdir,
+ .mknod = ntfs_mknod,
+ .rename = ntfs_rename,
+ .get_acl = ntfs_get_acl,
+ .set_acl = ntfs_set_acl,
+ .setattr = ntfs3_setattr,
+ .getattr = ntfs_getattr,
+ .listxattr = ntfs_listxattr,
+ .atomic_open = ntfs_atomic_open,
+ .fiemap = ntfs_fiemap,
+};
+
+const struct inode_operations ntfs_special_inode_operations = {
+ .setattr = ntfs3_setattr,
+ .getattr = ntfs_getattr,
+ .listxattr = ntfs_listxattr,
+ .get_acl = ntfs_get_acl,
+ .set_acl = ntfs_set_acl,
+};
+
+const struct dentry_operations ntfs_dentry_ops = {
+ .d_hash = ntfs_d_hash,
+ .d_compare = ntfs_d_compare,
+};
+
+// clang-format on