458 lines
9.3 KiB
C
458 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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*
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* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
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*
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*/
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#include <linux/fs.h>
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#include "debug.h"
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#include "ntfs.h"
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#include "ntfs_fs.h"
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/*
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* al_is_valid_le
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*
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* Return: True if @le is valid.
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*/
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static inline bool al_is_valid_le(const struct ntfs_inode *ni,
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struct ATTR_LIST_ENTRY *le)
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{
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if (!le || !ni->attr_list.le || !ni->attr_list.size)
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return false;
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return PtrOffset(ni->attr_list.le, le) + le16_to_cpu(le->size) <=
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ni->attr_list.size;
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}
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void al_destroy(struct ntfs_inode *ni)
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{
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run_close(&ni->attr_list.run);
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kfree(ni->attr_list.le);
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ni->attr_list.le = NULL;
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ni->attr_list.size = 0;
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ni->attr_list.dirty = false;
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}
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/*
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* ntfs_load_attr_list
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*
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* This method makes sure that the ATTRIB list, if present,
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* has been properly set up.
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*/
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int ntfs_load_attr_list(struct ntfs_inode *ni, struct ATTRIB *attr)
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{
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int err;
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size_t lsize;
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void *le = NULL;
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if (ni->attr_list.size)
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return 0;
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if (!attr->non_res) {
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lsize = le32_to_cpu(attr->res.data_size);
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le = kmalloc(al_aligned(lsize), GFP_NOFS);
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if (!le) {
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err = -ENOMEM;
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goto out;
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}
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memcpy(le, resident_data(attr), lsize);
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} else if (attr->nres.svcn) {
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err = -EINVAL;
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goto out;
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} else {
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u16 run_off = le16_to_cpu(attr->nres.run_off);
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lsize = le64_to_cpu(attr->nres.data_size);
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run_init(&ni->attr_list.run);
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err = run_unpack_ex(&ni->attr_list.run, ni->mi.sbi, ni->mi.rno,
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0, le64_to_cpu(attr->nres.evcn), 0,
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Add2Ptr(attr, run_off),
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le32_to_cpu(attr->size) - run_off);
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if (err < 0)
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goto out;
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le = kmalloc(al_aligned(lsize), GFP_NOFS);
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if (!le) {
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err = -ENOMEM;
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goto out;
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}
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err = ntfs_read_run_nb(ni->mi.sbi, &ni->attr_list.run, 0, le,
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lsize, NULL);
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if (err)
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goto out;
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}
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ni->attr_list.size = lsize;
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ni->attr_list.le = le;
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return 0;
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out:
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ni->attr_list.le = le;
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al_destroy(ni);
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return err;
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}
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/*
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* al_enumerate
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*
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* Return:
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* * The next list le.
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* * If @le is NULL then return the first le.
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*/
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struct ATTR_LIST_ENTRY *al_enumerate(struct ntfs_inode *ni,
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struct ATTR_LIST_ENTRY *le)
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{
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size_t off;
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u16 sz;
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if (!le) {
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le = ni->attr_list.le;
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} else {
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sz = le16_to_cpu(le->size);
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if (sz < sizeof(struct ATTR_LIST_ENTRY)) {
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/* Impossible 'cause we should not return such le. */
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return NULL;
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}
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le = Add2Ptr(le, sz);
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}
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/* Check boundary. */
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off = PtrOffset(ni->attr_list.le, le);
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if (off + sizeof(struct ATTR_LIST_ENTRY) > ni->attr_list.size) {
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/* The regular end of list. */
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return NULL;
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}
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sz = le16_to_cpu(le->size);
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/* Check le for errors. */
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if (sz < sizeof(struct ATTR_LIST_ENTRY) ||
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off + sz > ni->attr_list.size ||
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sz < le->name_off + le->name_len * sizeof(short)) {
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return NULL;
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}
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return le;
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}
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/*
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* al_find_le
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*
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* Find the first le in the list which matches type, name and VCN.
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*
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* Return: NULL if not found.
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*/
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struct ATTR_LIST_ENTRY *al_find_le(struct ntfs_inode *ni,
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struct ATTR_LIST_ENTRY *le,
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const struct ATTRIB *attr)
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{
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CLST svcn = attr_svcn(attr);
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return al_find_ex(ni, le, attr->type, attr_name(attr), attr->name_len,
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&svcn);
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}
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/*
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* al_find_ex
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*
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* Find the first le in the list which matches type, name and VCN.
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*
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* Return: NULL if not found.
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*/
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struct ATTR_LIST_ENTRY *al_find_ex(struct ntfs_inode *ni,
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struct ATTR_LIST_ENTRY *le,
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enum ATTR_TYPE type, const __le16 *name,
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u8 name_len, const CLST *vcn)
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{
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struct ATTR_LIST_ENTRY *ret = NULL;
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u32 type_in = le32_to_cpu(type);
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while ((le = al_enumerate(ni, le))) {
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u64 le_vcn;
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int diff = le32_to_cpu(le->type) - type_in;
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/* List entries are sorted by type, name and VCN. */
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if (diff < 0)
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continue;
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if (diff > 0)
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return ret;
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if (le->name_len != name_len)
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continue;
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le_vcn = le64_to_cpu(le->vcn);
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if (!le_vcn) {
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/*
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* Compare entry names only for entry with vcn == 0.
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*/
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diff = ntfs_cmp_names(le_name(le), name_len, name,
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name_len, ni->mi.sbi->upcase,
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true);
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if (diff < 0)
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continue;
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if (diff > 0)
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return ret;
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}
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if (!vcn)
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return le;
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if (*vcn == le_vcn)
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return le;
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if (*vcn < le_vcn)
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return ret;
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ret = le;
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}
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return ret;
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}
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/*
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* al_find_le_to_insert
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*
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* Find the first list entry which matches type, name and VCN.
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*/
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static struct ATTR_LIST_ENTRY *al_find_le_to_insert(struct ntfs_inode *ni,
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enum ATTR_TYPE type,
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const __le16 *name,
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u8 name_len, CLST vcn)
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{
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struct ATTR_LIST_ENTRY *le = NULL, *prev;
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u32 type_in = le32_to_cpu(type);
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/* List entries are sorted by type, name and VCN. */
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while ((le = al_enumerate(ni, prev = le))) {
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int diff = le32_to_cpu(le->type) - type_in;
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if (diff < 0)
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continue;
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if (diff > 0)
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return le;
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if (!le->vcn) {
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/*
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* Compare entry names only for entry with vcn == 0.
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*/
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diff = ntfs_cmp_names(le_name(le), le->name_len, name,
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name_len, ni->mi.sbi->upcase,
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true);
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if (diff < 0)
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continue;
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if (diff > 0)
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return le;
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}
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if (le64_to_cpu(le->vcn) >= vcn)
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return le;
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}
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return prev ? Add2Ptr(prev, le16_to_cpu(prev->size)) : ni->attr_list.le;
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}
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/*
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* al_add_le
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*
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* Add an "attribute list entry" to the list.
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*/
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int al_add_le(struct ntfs_inode *ni, enum ATTR_TYPE type, const __le16 *name,
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u8 name_len, CLST svcn, __le16 id, const struct MFT_REF *ref,
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struct ATTR_LIST_ENTRY **new_le)
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{
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int err;
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struct ATTRIB *attr;
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struct ATTR_LIST_ENTRY *le;
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size_t off;
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u16 sz;
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size_t asize, new_asize, old_size;
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u64 new_size;
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typeof(ni->attr_list) *al = &ni->attr_list;
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/*
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* Compute the size of the new 'le'
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*/
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sz = le_size(name_len);
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old_size = al->size;
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new_size = old_size + sz;
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asize = al_aligned(old_size);
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new_asize = al_aligned(new_size);
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/* Scan forward to the point at which the new 'le' should be inserted. */
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le = al_find_le_to_insert(ni, type, name, name_len, svcn);
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off = PtrOffset(al->le, le);
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if (new_size > asize) {
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void *ptr = kmalloc(new_asize, GFP_NOFS);
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if (!ptr)
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return -ENOMEM;
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memcpy(ptr, al->le, off);
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memcpy(Add2Ptr(ptr, off + sz), le, old_size - off);
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le = Add2Ptr(ptr, off);
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kfree(al->le);
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al->le = ptr;
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} else {
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memmove(Add2Ptr(le, sz), le, old_size - off);
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}
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*new_le = le;
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al->size = new_size;
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le->type = type;
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le->size = cpu_to_le16(sz);
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le->name_len = name_len;
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le->name_off = offsetof(struct ATTR_LIST_ENTRY, name);
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le->vcn = cpu_to_le64(svcn);
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le->ref = *ref;
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le->id = id;
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memcpy(le->name, name, sizeof(short) * name_len);
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err = attr_set_size(ni, ATTR_LIST, NULL, 0, &al->run, new_size,
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&new_size, true, &attr);
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if (err) {
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/* Undo memmove above. */
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memmove(le, Add2Ptr(le, sz), old_size - off);
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al->size = old_size;
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return err;
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}
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al->dirty = true;
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if (attr && attr->non_res) {
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err = ntfs_sb_write_run(ni->mi.sbi, &al->run, 0, al->le,
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al->size, 0);
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if (err)
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return err;
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al->dirty = false;
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}
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return 0;
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}
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/*
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* al_remove_le - Remove @le from attribute list.
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*/
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bool al_remove_le(struct ntfs_inode *ni, struct ATTR_LIST_ENTRY *le)
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{
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u16 size;
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size_t off;
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typeof(ni->attr_list) *al = &ni->attr_list;
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if (!al_is_valid_le(ni, le))
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return false;
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/* Save on stack the size of 'le' */
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size = le16_to_cpu(le->size);
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off = PtrOffset(al->le, le);
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memmove(le, Add2Ptr(le, size), al->size - (off + size));
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al->size -= size;
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al->dirty = true;
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return true;
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}
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/*
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* al_delete_le - Delete first le from the list which matches its parameters.
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*/
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bool al_delete_le(struct ntfs_inode *ni, enum ATTR_TYPE type, CLST vcn,
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const __le16 *name, size_t name_len,
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const struct MFT_REF *ref)
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{
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u16 size;
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struct ATTR_LIST_ENTRY *le;
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size_t off;
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typeof(ni->attr_list) *al = &ni->attr_list;
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/* Scan forward to the first le that matches the input. */
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le = al_find_ex(ni, NULL, type, name, name_len, &vcn);
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if (!le)
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return false;
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off = PtrOffset(al->le, le);
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next:
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if (off >= al->size)
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return false;
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if (le->type != type)
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return false;
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if (le->name_len != name_len)
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return false;
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if (name_len && ntfs_cmp_names(le_name(le), name_len, name, name_len,
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ni->mi.sbi->upcase, true))
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return false;
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if (le64_to_cpu(le->vcn) != vcn)
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return false;
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/*
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* The caller specified a segment reference, so we have to
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* scan through the matching entries until we find that segment
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* reference or we run of matching entries.
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*/
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if (ref && memcmp(ref, &le->ref, sizeof(*ref))) {
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off += le16_to_cpu(le->size);
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le = Add2Ptr(al->le, off);
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goto next;
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}
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/* Save on stack the size of 'le'. */
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size = le16_to_cpu(le->size);
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/* Delete the le. */
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memmove(le, Add2Ptr(le, size), al->size - (off + size));
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al->size -= size;
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al->dirty = true;
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return true;
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}
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int al_update(struct ntfs_inode *ni, int sync)
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{
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int err;
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struct ATTRIB *attr;
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typeof(ni->attr_list) *al = &ni->attr_list;
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if (!al->dirty || !al->size)
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return 0;
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/*
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* Attribute list increased on demand in al_add_le.
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* Attribute list decreased here.
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*/
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err = attr_set_size(ni, ATTR_LIST, NULL, 0, &al->run, al->size, NULL,
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false, &attr);
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if (err)
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goto out;
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if (!attr->non_res) {
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memcpy(resident_data(attr), al->le, al->size);
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} else {
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err = ntfs_sb_write_run(ni->mi.sbi, &al->run, 0, al->le,
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al->size, sync);
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if (err)
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goto out;
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attr->nres.valid_size = attr->nres.data_size;
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}
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ni->mi.dirty = true;
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al->dirty = false;
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out:
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return err;
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}
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