Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *
0004  * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
0005  *
0006  */
0007 
0008 #include <linux/fs.h>
0009 #include <linux/posix_acl.h>
0010 #include <linux/posix_acl_xattr.h>
0011 #include <linux/xattr.h>
0012 
0013 #include "debug.h"
0014 #include "ntfs.h"
0015 #include "ntfs_fs.h"
0016 
0017 // clang-format off
0018 #define SYSTEM_DOS_ATTRIB    "system.dos_attrib"
0019 #define SYSTEM_NTFS_ATTRIB   "system.ntfs_attrib"
0020 #define SYSTEM_NTFS_SECURITY "system.ntfs_security"
0021 // clang-format on
0022 
0023 static inline size_t unpacked_ea_size(const struct EA_FULL *ea)
0024 {
0025     return ea->size ? le32_to_cpu(ea->size)
0026             : ALIGN(struct_size(ea, name,
0027                         1 + ea->name_len +
0028                             le16_to_cpu(ea->elength)),
0029                 4);
0030 }
0031 
0032 static inline size_t packed_ea_size(const struct EA_FULL *ea)
0033 {
0034     return struct_size(ea, name,
0035                1 + ea->name_len + le16_to_cpu(ea->elength)) -
0036            offsetof(struct EA_FULL, flags);
0037 }
0038 
0039 /*
0040  * find_ea
0041  *
0042  * Assume there is at least one xattr in the list.
0043  */
0044 static inline bool find_ea(const struct EA_FULL *ea_all, u32 bytes,
0045                const char *name, u8 name_len, u32 *off)
0046 {
0047     *off = 0;
0048 
0049     if (!ea_all || !bytes)
0050         return false;
0051 
0052     for (;;) {
0053         const struct EA_FULL *ea = Add2Ptr(ea_all, *off);
0054         u32 next_off = *off + unpacked_ea_size(ea);
0055 
0056         if (next_off > bytes)
0057             return false;
0058 
0059         if (ea->name_len == name_len &&
0060             !memcmp(ea->name, name, name_len))
0061             return true;
0062 
0063         *off = next_off;
0064         if (next_off >= bytes)
0065             return false;
0066     }
0067 }
0068 
0069 /*
0070  * ntfs_read_ea - Read all extended attributes.
0071  * @ea:     New allocated memory.
0072  * @info:   Pointer into resident data.
0073  */
0074 static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea,
0075             size_t add_bytes, const struct EA_INFO **info)
0076 {
0077     int err;
0078     struct ntfs_sb_info *sbi = ni->mi.sbi;
0079     struct ATTR_LIST_ENTRY *le = NULL;
0080     struct ATTRIB *attr_info, *attr_ea;
0081     void *ea_p;
0082     u32 size;
0083 
0084     static_assert(le32_to_cpu(ATTR_EA_INFO) < le32_to_cpu(ATTR_EA));
0085 
0086     *ea = NULL;
0087     *info = NULL;
0088 
0089     attr_info =
0090         ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, NULL);
0091     attr_ea =
0092         ni_find_attr(ni, attr_info, &le, ATTR_EA, NULL, 0, NULL, NULL);
0093 
0094     if (!attr_ea || !attr_info)
0095         return 0;
0096 
0097     *info = resident_data_ex(attr_info, sizeof(struct EA_INFO));
0098     if (!*info)
0099         return -EINVAL;
0100 
0101     /* Check Ea limit. */
0102     size = le32_to_cpu((*info)->size);
0103     if (size > sbi->ea_max_size)
0104         return -EFBIG;
0105 
0106     if (attr_size(attr_ea) > sbi->ea_max_size)
0107         return -EFBIG;
0108 
0109     /* Allocate memory for packed Ea. */
0110     ea_p = kmalloc(size + add_bytes, GFP_NOFS);
0111     if (!ea_p)
0112         return -ENOMEM;
0113 
0114     if (!size) {
0115         /* EA info persists, but xattr is empty. Looks like EA problem. */
0116     } else if (attr_ea->non_res) {
0117         struct runs_tree run;
0118 
0119         run_init(&run);
0120 
0121         err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &run, 0, size);
0122         if (!err)
0123             err = ntfs_read_run_nb(sbi, &run, 0, ea_p, size, NULL);
0124         run_close(&run);
0125 
0126         if (err)
0127             goto out;
0128     } else {
0129         void *p = resident_data_ex(attr_ea, size);
0130 
0131         if (!p) {
0132             err = -EINVAL;
0133             goto out;
0134         }
0135         memcpy(ea_p, p, size);
0136     }
0137 
0138     memset(Add2Ptr(ea_p, size), 0, add_bytes);
0139     *ea = ea_p;
0140     return 0;
0141 
0142 out:
0143     kfree(ea_p);
0144     *ea = NULL;
0145     return err;
0146 }
0147 
0148 /*
0149  * ntfs_list_ea
0150  *
0151  * Copy a list of xattrs names into the buffer
0152  * provided, or compute the buffer size required.
0153  *
0154  * Return:
0155  * * Number of bytes used / required on
0156  * * -ERRNO - on failure
0157  */
0158 static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
0159                 size_t bytes_per_buffer)
0160 {
0161     const struct EA_INFO *info;
0162     struct EA_FULL *ea_all = NULL;
0163     const struct EA_FULL *ea;
0164     u32 off, size;
0165     int err;
0166     size_t ret;
0167 
0168     err = ntfs_read_ea(ni, &ea_all, 0, &info);
0169     if (err)
0170         return err;
0171 
0172     if (!info || !ea_all)
0173         return 0;
0174 
0175     size = le32_to_cpu(info->size);
0176 
0177     /* Enumerate all xattrs. */
0178     for (ret = 0, off = 0; off < size; off += unpacked_ea_size(ea)) {
0179         ea = Add2Ptr(ea_all, off);
0180 
0181         if (buffer) {
0182             if (ret + ea->name_len + 1 > bytes_per_buffer) {
0183                 err = -ERANGE;
0184                 goto out;
0185             }
0186 
0187             memcpy(buffer + ret, ea->name, ea->name_len);
0188             buffer[ret + ea->name_len] = 0;
0189         }
0190 
0191         ret += ea->name_len + 1;
0192     }
0193 
0194 out:
0195     kfree(ea_all);
0196     return err ? err : ret;
0197 }
0198 
0199 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len,
0200                void *buffer, size_t size, size_t *required)
0201 {
0202     struct ntfs_inode *ni = ntfs_i(inode);
0203     const struct EA_INFO *info;
0204     struct EA_FULL *ea_all = NULL;
0205     const struct EA_FULL *ea;
0206     u32 off, len;
0207     int err;
0208 
0209     if (!(ni->ni_flags & NI_FLAG_EA))
0210         return -ENODATA;
0211 
0212     if (!required)
0213         ni_lock(ni);
0214 
0215     len = 0;
0216 
0217     if (name_len > 255) {
0218         err = -ENAMETOOLONG;
0219         goto out;
0220     }
0221 
0222     err = ntfs_read_ea(ni, &ea_all, 0, &info);
0223     if (err)
0224         goto out;
0225 
0226     if (!info)
0227         goto out;
0228 
0229     /* Enumerate all xattrs. */
0230     if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off)) {
0231         err = -ENODATA;
0232         goto out;
0233     }
0234     ea = Add2Ptr(ea_all, off);
0235 
0236     len = le16_to_cpu(ea->elength);
0237     if (!buffer) {
0238         err = 0;
0239         goto out;
0240     }
0241 
0242     if (len > size) {
0243         err = -ERANGE;
0244         if (required)
0245             *required = len;
0246         goto out;
0247     }
0248 
0249     memcpy(buffer, ea->name + ea->name_len + 1, len);
0250     err = 0;
0251 
0252 out:
0253     kfree(ea_all);
0254     if (!required)
0255         ni_unlock(ni);
0256 
0257     return err ? err : len;
0258 }
0259 
0260 static noinline int ntfs_set_ea(struct inode *inode, const char *name,
0261                 size_t name_len, const void *value,
0262                 size_t val_size, int flags, bool locked)
0263 {
0264     struct ntfs_inode *ni = ntfs_i(inode);
0265     struct ntfs_sb_info *sbi = ni->mi.sbi;
0266     int err;
0267     struct EA_INFO ea_info;
0268     const struct EA_INFO *info;
0269     struct EA_FULL *new_ea;
0270     struct EA_FULL *ea_all = NULL;
0271     size_t add, new_pack;
0272     u32 off, size;
0273     __le16 size_pack;
0274     struct ATTRIB *attr;
0275     struct ATTR_LIST_ENTRY *le;
0276     struct mft_inode *mi;
0277     struct runs_tree ea_run;
0278     u64 new_sz;
0279     void *p;
0280 
0281     if (!locked)
0282         ni_lock(ni);
0283 
0284     run_init(&ea_run);
0285 
0286     if (name_len > 255) {
0287         err = -ENAMETOOLONG;
0288         goto out;
0289     }
0290 
0291     add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4);
0292 
0293     err = ntfs_read_ea(ni, &ea_all, add, &info);
0294     if (err)
0295         goto out;
0296 
0297     if (!info) {
0298         memset(&ea_info, 0, sizeof(ea_info));
0299         size = 0;
0300         size_pack = 0;
0301     } else {
0302         memcpy(&ea_info, info, sizeof(ea_info));
0303         size = le32_to_cpu(ea_info.size);
0304         size_pack = ea_info.size_pack;
0305     }
0306 
0307     if (info && find_ea(ea_all, size, name, name_len, &off)) {
0308         struct EA_FULL *ea;
0309         size_t ea_sz;
0310 
0311         if (flags & XATTR_CREATE) {
0312             err = -EEXIST;
0313             goto out;
0314         }
0315 
0316         ea = Add2Ptr(ea_all, off);
0317 
0318         /*
0319          * Check simple case when we try to insert xattr with the same value
0320          * e.g. ntfs_save_wsl_perm
0321          */
0322         if (val_size && le16_to_cpu(ea->elength) == val_size &&
0323             !memcmp(ea->name + ea->name_len + 1, value, val_size)) {
0324             /* xattr already contains the required value. */
0325             goto out;
0326         }
0327 
0328         /* Remove current xattr. */
0329         if (ea->flags & FILE_NEED_EA)
0330             le16_add_cpu(&ea_info.count, -1);
0331 
0332         ea_sz = unpacked_ea_size(ea);
0333 
0334         le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea));
0335 
0336         memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz);
0337 
0338         size -= ea_sz;
0339         memset(Add2Ptr(ea_all, size), 0, ea_sz);
0340 
0341         ea_info.size = cpu_to_le32(size);
0342 
0343         if ((flags & XATTR_REPLACE) && !val_size) {
0344             /* Remove xattr. */
0345             goto update_ea;
0346         }
0347     } else {
0348         if (flags & XATTR_REPLACE) {
0349             err = -ENODATA;
0350             goto out;
0351         }
0352 
0353         if (!ea_all) {
0354             ea_all = kzalloc(add, GFP_NOFS);
0355             if (!ea_all) {
0356                 err = -ENOMEM;
0357                 goto out;
0358             }
0359         }
0360     }
0361 
0362     /* Append new xattr. */
0363     new_ea = Add2Ptr(ea_all, size);
0364     new_ea->size = cpu_to_le32(add);
0365     new_ea->flags = 0;
0366     new_ea->name_len = name_len;
0367     new_ea->elength = cpu_to_le16(val_size);
0368     memcpy(new_ea->name, name, name_len);
0369     new_ea->name[name_len] = 0;
0370     memcpy(new_ea->name + name_len + 1, value, val_size);
0371     new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea);
0372     ea_info.size_pack = cpu_to_le16(new_pack);
0373     /* New size of ATTR_EA. */
0374     size += add;
0375     ea_info.size = cpu_to_le32(size);
0376 
0377     /*
0378      * 1. Check ea_info.size_pack for overflow.
0379      * 2. New attibute size must fit value from $AttrDef
0380      */
0381     if (new_pack > 0xffff || size > sbi->ea_max_size) {
0382         ntfs_inode_warn(
0383             inode,
0384             "The size of extended attributes must not exceed 64KiB");
0385         err = -EFBIG; // -EINVAL?
0386         goto out;
0387     }
0388 
0389 update_ea:
0390 
0391     if (!info) {
0392         /* Create xattr. */
0393         if (!size) {
0394             err = 0;
0395             goto out;
0396         }
0397 
0398         err = ni_insert_resident(ni, sizeof(struct EA_INFO),
0399                      ATTR_EA_INFO, NULL, 0, NULL, NULL,
0400                      NULL);
0401         if (err)
0402             goto out;
0403 
0404         err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL,
0405                      NULL);
0406         if (err)
0407             goto out;
0408     }
0409 
0410     new_sz = size;
0411     err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz,
0412                 false, NULL);
0413     if (err)
0414         goto out;
0415 
0416     le = NULL;
0417     attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi);
0418     if (!attr) {
0419         err = -EINVAL;
0420         goto out;
0421     }
0422 
0423     if (!size) {
0424         /* Delete xattr, ATTR_EA_INFO */
0425         ni_remove_attr_le(ni, attr, mi, le);
0426     } else {
0427         p = resident_data_ex(attr, sizeof(struct EA_INFO));
0428         if (!p) {
0429             err = -EINVAL;
0430             goto out;
0431         }
0432         memcpy(p, &ea_info, sizeof(struct EA_INFO));
0433         mi->dirty = true;
0434     }
0435 
0436     le = NULL;
0437     attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi);
0438     if (!attr) {
0439         err = -EINVAL;
0440         goto out;
0441     }
0442 
0443     if (!size) {
0444         /* Delete xattr, ATTR_EA */
0445         ni_remove_attr_le(ni, attr, mi, le);
0446     } else if (attr->non_res) {
0447         err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0,
0448                        size);
0449         if (err)
0450             goto out;
0451 
0452         err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0);
0453         if (err)
0454             goto out;
0455     } else {
0456         p = resident_data_ex(attr, size);
0457         if (!p) {
0458             err = -EINVAL;
0459             goto out;
0460         }
0461         memcpy(p, ea_all, size);
0462         mi->dirty = true;
0463     }
0464 
0465     /* Check if we delete the last xattr. */
0466     if (size)
0467         ni->ni_flags |= NI_FLAG_EA;
0468     else
0469         ni->ni_flags &= ~NI_FLAG_EA;
0470 
0471     if (ea_info.size_pack != size_pack)
0472         ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
0473     mark_inode_dirty(&ni->vfs_inode);
0474 
0475 out:
0476     if (!locked)
0477         ni_unlock(ni);
0478 
0479     run_close(&ea_run);
0480     kfree(ea_all);
0481 
0482     return err;
0483 }
0484 
0485 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
0486 static struct posix_acl *ntfs_get_acl_ex(struct inode *inode, int type,
0487                      int locked)
0488 {
0489     struct ntfs_inode *ni = ntfs_i(inode);
0490     const char *name;
0491     size_t name_len;
0492     struct posix_acl *acl;
0493     size_t req;
0494     int err;
0495     void *buf;
0496 
0497     /* Allocate PATH_MAX bytes. */
0498     buf = __getname();
0499     if (!buf)
0500         return ERR_PTR(-ENOMEM);
0501 
0502     /* Possible values of 'type' was already checked above. */
0503     if (type == ACL_TYPE_ACCESS) {
0504         name = XATTR_NAME_POSIX_ACL_ACCESS;
0505         name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
0506     } else {
0507         name = XATTR_NAME_POSIX_ACL_DEFAULT;
0508         name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
0509     }
0510 
0511     if (!locked)
0512         ni_lock(ni);
0513 
0514     err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req);
0515 
0516     if (!locked)
0517         ni_unlock(ni);
0518 
0519     /* Translate extended attribute to acl. */
0520     if (err >= 0) {
0521         acl = posix_acl_from_xattr(&init_user_ns, buf, err);
0522     } else if (err == -ENODATA) {
0523         acl = NULL;
0524     } else {
0525         acl = ERR_PTR(err);
0526     }
0527 
0528     if (!IS_ERR(acl))
0529         set_cached_acl(inode, type, acl);
0530 
0531     __putname(buf);
0532 
0533     return acl;
0534 }
0535 
0536 /*
0537  * ntfs_get_acl - inode_operations::get_acl
0538  */
0539 struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu)
0540 {
0541     if (rcu)
0542         return ERR_PTR(-ECHILD);
0543 
0544     return ntfs_get_acl_ex(inode, type, 0);
0545 }
0546 
0547 static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
0548                     struct inode *inode, struct posix_acl *acl,
0549                     int type, bool init_acl)
0550 {
0551     const char *name;
0552     size_t size, name_len;
0553     void *value;
0554     int err;
0555     int flags;
0556     umode_t mode;
0557 
0558     if (S_ISLNK(inode->i_mode))
0559         return -EOPNOTSUPP;
0560 
0561     mode = inode->i_mode;
0562     switch (type) {
0563     case ACL_TYPE_ACCESS:
0564         /* Do not change i_mode if we are in init_acl */
0565         if (acl && !init_acl) {
0566             err = posix_acl_update_mode(mnt_userns, inode, &mode,
0567                             &acl);
0568             if (err)
0569                 return err;
0570         }
0571         name = XATTR_NAME_POSIX_ACL_ACCESS;
0572         name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
0573         break;
0574 
0575     case ACL_TYPE_DEFAULT:
0576         if (!S_ISDIR(inode->i_mode))
0577             return acl ? -EACCES : 0;
0578         name = XATTR_NAME_POSIX_ACL_DEFAULT;
0579         name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
0580         break;
0581 
0582     default:
0583         return -EINVAL;
0584     }
0585 
0586     if (!acl) {
0587         /* Remove xattr if it can be presented via mode. */
0588         size = 0;
0589         value = NULL;
0590         flags = XATTR_REPLACE;
0591     } else {
0592         size = posix_acl_xattr_size(acl->a_count);
0593         value = kmalloc(size, GFP_NOFS);
0594         if (!value)
0595             return -ENOMEM;
0596         err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
0597         if (err < 0)
0598             goto out;
0599         flags = 0;
0600     }
0601 
0602     err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0);
0603     if (err == -ENODATA && !size)
0604         err = 0; /* Removing non existed xattr. */
0605     if (!err) {
0606         set_cached_acl(inode, type, acl);
0607         if (inode->i_mode != mode) {
0608             inode->i_mode = mode;
0609             mark_inode_dirty(inode);
0610         }
0611     }
0612 
0613 out:
0614     kfree(value);
0615 
0616     return err;
0617 }
0618 
0619 /*
0620  * ntfs_set_acl - inode_operations::set_acl
0621  */
0622 int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
0623          struct posix_acl *acl, int type)
0624 {
0625     return ntfs_set_acl_ex(mnt_userns, inode, acl, type, false);
0626 }
0627 
0628 static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns,
0629                   struct inode *inode, int type, void *buffer,
0630                   size_t size)
0631 {
0632     struct posix_acl *acl;
0633     int err;
0634 
0635     if (!(inode->i_sb->s_flags & SB_POSIXACL)) {
0636         ntfs_inode_warn(inode, "add mount option \"acl\" to use acl");
0637         return -EOPNOTSUPP;
0638     }
0639 
0640     acl = ntfs_get_acl(inode, type, false);
0641     if (IS_ERR(acl))
0642         return PTR_ERR(acl);
0643 
0644     if (!acl)
0645         return -ENODATA;
0646 
0647     err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
0648     posix_acl_release(acl);
0649 
0650     return err;
0651 }
0652 
0653 static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns,
0654                   struct inode *inode, int type, const void *value,
0655                   size_t size)
0656 {
0657     struct posix_acl *acl;
0658     int err;
0659 
0660     if (!(inode->i_sb->s_flags & SB_POSIXACL)) {
0661         ntfs_inode_warn(inode, "add mount option \"acl\" to use acl");
0662         return -EOPNOTSUPP;
0663     }
0664 
0665     if (!inode_owner_or_capable(mnt_userns, inode))
0666         return -EPERM;
0667 
0668     if (!value) {
0669         acl = NULL;
0670     } else {
0671         acl = posix_acl_from_xattr(&init_user_ns, value, size);
0672         if (IS_ERR(acl))
0673             return PTR_ERR(acl);
0674 
0675         if (acl) {
0676             err = posix_acl_valid(&init_user_ns, acl);
0677             if (err)
0678                 goto release_and_out;
0679         }
0680     }
0681 
0682     err = ntfs_set_acl(mnt_userns, inode, acl, type);
0683 
0684 release_and_out:
0685     posix_acl_release(acl);
0686     return err;
0687 }
0688 
0689 /*
0690  * ntfs_init_acl - Initialize the ACLs of a new inode.
0691  *
0692  * Called from ntfs_create_inode().
0693  */
0694 int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
0695           struct inode *dir)
0696 {
0697     struct posix_acl *default_acl, *acl;
0698     int err;
0699 
0700     err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
0701     if (err)
0702         return err;
0703 
0704     if (default_acl) {
0705         err = ntfs_set_acl_ex(mnt_userns, inode, default_acl,
0706                       ACL_TYPE_DEFAULT, true);
0707         posix_acl_release(default_acl);
0708     } else {
0709         inode->i_default_acl = NULL;
0710     }
0711 
0712     if (acl) {
0713         if (!err)
0714             err = ntfs_set_acl_ex(mnt_userns, inode, acl,
0715                           ACL_TYPE_ACCESS, true);
0716         posix_acl_release(acl);
0717     } else {
0718         inode->i_acl = NULL;
0719     }
0720 
0721     return err;
0722 }
0723 #endif
0724 
0725 /*
0726  * ntfs_acl_chmod - Helper for ntfs3_setattr().
0727  */
0728 int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode)
0729 {
0730     struct super_block *sb = inode->i_sb;
0731 
0732     if (!(sb->s_flags & SB_POSIXACL))
0733         return 0;
0734 
0735     if (S_ISLNK(inode->i_mode))
0736         return -EOPNOTSUPP;
0737 
0738     return posix_acl_chmod(mnt_userns, inode, inode->i_mode);
0739 }
0740 
0741 /*
0742  * ntfs_permission - inode_operations::permission
0743  */
0744 int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
0745             int mask)
0746 {
0747     if (ntfs_sb(inode->i_sb)->options->noacsrules) {
0748         /* "No access rules" mode - Allow all changes. */
0749         return 0;
0750     }
0751 
0752     return generic_permission(mnt_userns, inode, mask);
0753 }
0754 
0755 /*
0756  * ntfs_listxattr - inode_operations::listxattr
0757  */
0758 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
0759 {
0760     struct inode *inode = d_inode(dentry);
0761     struct ntfs_inode *ni = ntfs_i(inode);
0762     ssize_t ret;
0763 
0764     if (!(ni->ni_flags & NI_FLAG_EA)) {
0765         /* no xattr in file */
0766         return 0;
0767     }
0768 
0769     ni_lock(ni);
0770 
0771     ret = ntfs_list_ea(ni, buffer, size);
0772 
0773     ni_unlock(ni);
0774 
0775     return ret;
0776 }
0777 
0778 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
0779              struct inode *inode, const char *name, void *buffer,
0780              size_t size)
0781 {
0782     int err;
0783     struct ntfs_inode *ni = ntfs_i(inode);
0784     size_t name_len = strlen(name);
0785 
0786     /* Dispatch request. */
0787     if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 &&
0788         !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) {
0789         /* system.dos_attrib */
0790         if (!buffer) {
0791             err = sizeof(u8);
0792         } else if (size < sizeof(u8)) {
0793             err = -ENODATA;
0794         } else {
0795             err = sizeof(u8);
0796             *(u8 *)buffer = le32_to_cpu(ni->std_fa);
0797         }
0798         goto out;
0799     }
0800 
0801     if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 &&
0802         !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) {
0803         /* system.ntfs_attrib */
0804         if (!buffer) {
0805             err = sizeof(u32);
0806         } else if (size < sizeof(u32)) {
0807             err = -ENODATA;
0808         } else {
0809             err = sizeof(u32);
0810             *(u32 *)buffer = le32_to_cpu(ni->std_fa);
0811         }
0812         goto out;
0813     }
0814 
0815     if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 &&
0816         !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) {
0817         /* system.ntfs_security*/
0818         struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL;
0819         size_t sd_size = 0;
0820 
0821         if (!is_ntfs3(ni->mi.sbi)) {
0822             /* We should get nt4 security. */
0823             err = -EINVAL;
0824             goto out;
0825         } else if (le32_to_cpu(ni->std_security_id) <
0826                SECURITY_ID_FIRST) {
0827             err = -ENOENT;
0828             goto out;
0829         }
0830 
0831         err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id,
0832                           &sd, &sd_size);
0833         if (err)
0834             goto out;
0835 
0836         if (!is_sd_valid(sd, sd_size)) {
0837             ntfs_inode_warn(
0838                 inode,
0839                 "looks like you get incorrect security descriptor id=%u",
0840                 ni->std_security_id);
0841         }
0842 
0843         if (!buffer) {
0844             err = sd_size;
0845         } else if (size < sd_size) {
0846             err = -ENODATA;
0847         } else {
0848             err = sd_size;
0849             memcpy(buffer, sd, sd_size);
0850         }
0851         kfree(sd);
0852         goto out;
0853     }
0854 
0855 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
0856     if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
0857          !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
0858              sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
0859         (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
0860          !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
0861              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
0862         /* TODO: init_user_ns? */
0863         err = ntfs_xattr_get_acl(
0864             &init_user_ns, inode,
0865             name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
0866                 ? ACL_TYPE_ACCESS
0867                 : ACL_TYPE_DEFAULT,
0868             buffer, size);
0869         goto out;
0870     }
0871 #endif
0872     /* Deal with NTFS extended attribute. */
0873     err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL);
0874 
0875 out:
0876     return err;
0877 }
0878 
0879 /*
0880  * ntfs_setxattr - inode_operations::setxattr
0881  */
0882 static noinline int ntfs_setxattr(const struct xattr_handler *handler,
0883                   struct user_namespace *mnt_userns,
0884                   struct dentry *de, struct inode *inode,
0885                   const char *name, const void *value,
0886                   size_t size, int flags)
0887 {
0888     int err = -EINVAL;
0889     struct ntfs_inode *ni = ntfs_i(inode);
0890     size_t name_len = strlen(name);
0891     enum FILE_ATTRIBUTE new_fa;
0892 
0893     /* Dispatch request. */
0894     if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 &&
0895         !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) {
0896         if (sizeof(u8) != size)
0897             goto out;
0898         new_fa = cpu_to_le32(*(u8 *)value);
0899         goto set_new_fa;
0900     }
0901 
0902     if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 &&
0903         !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) {
0904         if (size != sizeof(u32))
0905             goto out;
0906         new_fa = cpu_to_le32(*(u32 *)value);
0907 
0908         if (S_ISREG(inode->i_mode)) {
0909             /* Process compressed/sparsed in special way. */
0910             ni_lock(ni);
0911             err = ni_new_attr_flags(ni, new_fa);
0912             ni_unlock(ni);
0913             if (err)
0914                 goto out;
0915         }
0916 set_new_fa:
0917         /*
0918          * Thanks Mark Harmstone:
0919          * Keep directory bit consistency.
0920          */
0921         if (S_ISDIR(inode->i_mode))
0922             new_fa |= FILE_ATTRIBUTE_DIRECTORY;
0923         else
0924             new_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
0925 
0926         if (ni->std_fa != new_fa) {
0927             ni->std_fa = new_fa;
0928             if (new_fa & FILE_ATTRIBUTE_READONLY)
0929                 inode->i_mode &= ~0222;
0930             else
0931                 inode->i_mode |= 0222;
0932             /* Std attribute always in primary record. */
0933             ni->mi.dirty = true;
0934             mark_inode_dirty(inode);
0935         }
0936         err = 0;
0937 
0938         goto out;
0939     }
0940 
0941     if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 &&
0942         !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) {
0943         /* system.ntfs_security*/
0944         __le32 security_id;
0945         bool inserted;
0946         struct ATTR_STD_INFO5 *std;
0947 
0948         if (!is_ntfs3(ni->mi.sbi)) {
0949             /*
0950              * We should replace ATTR_SECURE.
0951              * Skip this way cause it is nt4 feature.
0952              */
0953             err = -EINVAL;
0954             goto out;
0955         }
0956 
0957         if (!is_sd_valid(value, size)) {
0958             err = -EINVAL;
0959             ntfs_inode_warn(
0960                 inode,
0961                 "you try to set invalid security descriptor");
0962             goto out;
0963         }
0964 
0965         err = ntfs_insert_security(ni->mi.sbi, value, size,
0966                        &security_id, &inserted);
0967         if (err)
0968             goto out;
0969 
0970         ni_lock(ni);
0971         std = ni_std5(ni);
0972         if (!std) {
0973             err = -EINVAL;
0974         } else if (std->security_id != security_id) {
0975             std->security_id = ni->std_security_id = security_id;
0976             /* Std attribute always in primary record. */
0977             ni->mi.dirty = true;
0978             mark_inode_dirty(&ni->vfs_inode);
0979         }
0980         ni_unlock(ni);
0981         goto out;
0982     }
0983 
0984 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
0985     if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
0986          !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
0987              sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
0988         (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
0989          !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
0990              sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
0991         err = ntfs_xattr_set_acl(
0992             mnt_userns, inode,
0993             name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
0994                 ? ACL_TYPE_ACCESS
0995                 : ACL_TYPE_DEFAULT,
0996             value, size);
0997         goto out;
0998     }
0999 #endif
1000     /* Deal with NTFS extended attribute. */
1001     err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0);
1002 
1003 out:
1004     inode->i_ctime = current_time(inode);
1005     mark_inode_dirty(inode);
1006 
1007     return err;
1008 }
1009 
1010 /*
1011  * ntfs_save_wsl_perm
1012  *
1013  * save uid/gid/mode in xattr
1014  */
1015 int ntfs_save_wsl_perm(struct inode *inode)
1016 {
1017     int err;
1018     __le32 value;
1019     struct ntfs_inode *ni = ntfs_i(inode);
1020 
1021     ni_lock(ni);
1022     value = cpu_to_le32(i_uid_read(inode));
1023     err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
1024               sizeof(value), 0, true); /* true == already locked. */
1025     if (err)
1026         goto out;
1027 
1028     value = cpu_to_le32(i_gid_read(inode));
1029     err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
1030               sizeof(value), 0, true);
1031     if (err)
1032         goto out;
1033 
1034     value = cpu_to_le32(inode->i_mode);
1035     err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
1036               sizeof(value), 0, true);
1037     if (err)
1038         goto out;
1039 
1040     if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1041         value = cpu_to_le32(inode->i_rdev);
1042         err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
1043                   sizeof(value), 0, true);
1044         if (err)
1045             goto out;
1046     }
1047 
1048 out:
1049     ni_unlock(ni);
1050     /* In case of error should we delete all WSL xattr? */
1051     return err;
1052 }
1053 
1054 /*
1055  * ntfs_get_wsl_perm
1056  *
1057  * get uid/gid/mode from xattr
1058  * it is called from ntfs_iget5->ntfs_read_mft
1059  */
1060 void ntfs_get_wsl_perm(struct inode *inode)
1061 {
1062     size_t sz;
1063     __le32 value[3];
1064 
1065     if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0],
1066             sizeof(value[0]), &sz) == sizeof(value[0]) &&
1067         ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1],
1068             sizeof(value[1]), &sz) == sizeof(value[1]) &&
1069         ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2],
1070             sizeof(value[2]), &sz) == sizeof(value[2])) {
1071         i_uid_write(inode, (uid_t)le32_to_cpu(value[0]));
1072         i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
1073         inode->i_mode = le32_to_cpu(value[2]);
1074 
1075         if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
1076                 &value[0], sizeof(value),
1077                 &sz) == sizeof(value[0])) {
1078             inode->i_rdev = le32_to_cpu(value[0]);
1079         }
1080     }
1081 }
1082 
1083 static bool ntfs_xattr_user_list(struct dentry *dentry)
1084 {
1085     return true;
1086 }
1087 
1088 // clang-format off
1089 static const struct xattr_handler ntfs_xattr_handler = {
1090     .prefix = "",
1091     .get    = ntfs_getxattr,
1092     .set    = ntfs_setxattr,
1093     .list   = ntfs_xattr_user_list,
1094 };
1095 
1096 const struct xattr_handler *ntfs_xattr_handlers[] = {
1097     &ntfs_xattr_handler,
1098     NULL,
1099 };
1100 // clang-format on
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!