c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 1) // SPDX-License-Identifier: GPL-2.0
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 2) /*
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 3) * Routines that mimic syscalls, but don't use the user address space or file
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 4) * descriptors. Only for init/ and related early init code.
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 5) */
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 6) #include <linux/init.h>
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 7) #include <linux/mount.h>
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 8) #include <linux/namei.h>
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 9) #include <linux/fs.h>
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 10) #include <linux/fs_struct.h>
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 11) #include <linux/file.h>
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 12) #include <linux/init_syscalls.h>
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 13) #include <linux/security.h>
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 14) #include "internal.h"
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 15)
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 16) int __init init_mount(const char *dev_name, const char *dir_name,
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 17) const char *type_page, unsigned long flags, void *data_page)
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 18) {
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 19) struct path path;
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 20) int ret;
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 21)
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 22) ret = kern_path(dir_name, LOOKUP_FOLLOW, &path);
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 23) if (ret)
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 24) return ret;
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 25) ret = path_mount(dev_name, &path, type_page, flags, data_page);
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 26) path_put(&path);
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 27) return ret;
c60166f04283f (Christoph Hellwig 2020-07-21 11:12:08 +0200 28) }
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 29)
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 30) int __init init_umount(const char *name, int flags)
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 31) {
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 32) int lookup_flags = LOOKUP_MOUNTPOINT;
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 33) struct path path;
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 34) int ret;
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 35)
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 36) if (!(flags & UMOUNT_NOFOLLOW))
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 37) lookup_flags |= LOOKUP_FOLLOW;
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 38) ret = kern_path(name, lookup_flags, &path);
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 39) if (ret)
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 40) return ret;
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 41) return path_umount(&path, flags);
09267defa36aa (Christoph Hellwig 2020-07-23 08:23:08 +0200 42) }
8fb9f73e5a539 (Christoph Hellwig 2020-07-23 08:23:40 +0200 43)
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 44) int __init init_chdir(const char *filename)
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 45) {
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 46) struct path path;
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 47) int error;
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 48)
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 49) error = kern_path(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 50) if (error)
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 51) return error;
02f92b3868a1b (Christian Brauner 2021-01-21 14:19:22 +0100 52) error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 53) if (!error)
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 54) set_fs_pwd(current->fs, &path);
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 55) path_put(&path);
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 56) return error;
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 57) }
db63f1e315384 (Christoph Hellwig 2020-07-22 11:25:21 +0200 58)
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 59) int __init init_chroot(const char *filename)
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 60) {
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 61) struct path path;
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 62) int error;
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 63)
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 64) error = kern_path(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 65) if (error)
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 66) return error;
02f92b3868a1b (Christian Brauner 2021-01-21 14:19:22 +0100 67) error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 68) if (error)
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 69) goto dput_and_out;
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 70) error = -EPERM;
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 71) if (!ns_capable(current_user_ns(), CAP_SYS_CHROOT))
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 72) goto dput_and_out;
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 73) error = security_path_chroot(&path);
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 74) if (error)
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 75) goto dput_and_out;
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 76) set_fs_root(current->fs, &path);
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 77) dput_and_out:
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 78) path_put(&path);
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 79) return error;
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 80) }
4b7ca5014cbef (Christoph Hellwig 2020-07-22 11:26:13 +0200 81)
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 82) int __init init_chown(const char *filename, uid_t user, gid_t group, int flags)
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 83) {
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 84) int lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 85) struct path path;
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 86) int error;
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 87)
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 88) error = kern_path(filename, lookup_flags, &path);
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 89) if (error)
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 90) return error;
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 91) error = mnt_want_write(path.mnt);
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 92) if (!error) {
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 93) error = chown_common(&path, user, group);
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 94) mnt_drop_write(path.mnt);
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 95) }
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 96) path_put(&path);
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 97) return error;
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 98) }
b873498f99c77 (Christoph Hellwig 2020-07-22 11:13:26 +0200 99)
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 100) int __init init_chmod(const char *filename, umode_t mode)
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 101) {
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 102) struct path path;
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 103) int error;
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 104)
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 105) error = kern_path(filename, LOOKUP_FOLLOW, &path);
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 106) if (error)
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 107) return error;
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 108) error = chmod_common(&path, mode);
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 109) path_put(&path);
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 110) return error;
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 111) }
1097742efc643 (Christoph Hellwig 2020-07-22 11:41:02 +0200 112)
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 113) int __init init_eaccess(const char *filename)
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 114) {
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 115) struct path path;
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 116) int error;
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 117)
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 118) error = kern_path(filename, LOOKUP_FOLLOW, &path);
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 119) if (error)
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 120) return error;
02f92b3868a1b (Christian Brauner 2021-01-21 14:19:22 +0100 121) error = path_permission(&path, MAY_ACCESS);
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 122) path_put(&path);
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 123) return error;
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 124) }
eb9d7d390e511 (Christoph Hellwig 2020-07-22 11:14:02 +0200 125)
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 126) int __init init_stat(const char *filename, struct kstat *stat, int flags)
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 127) {
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 128) int lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 129) struct path path;
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 130) int error;
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 131)
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 132) error = kern_path(filename, lookup_flags, &path);
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 133) if (error)
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 134) return error;
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 135) error = vfs_getattr(&path, stat, STATX_BASIC_STATS,
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 136) flags | AT_NO_AUTOMOUNT);
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 137) path_put(&path);
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 138) return error;
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 139) }
716308a5331bf (Christoph Hellwig 2020-07-22 11:15:40 +0200 140)
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 141) int __init init_mknod(const char *filename, umode_t mode, unsigned int dev)
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 142) {
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 143) struct dentry *dentry;
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 144) struct path path;
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 145) int error;
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 146)
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 147) if (S_ISFIFO(mode) || S_ISSOCK(mode))
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 148) dev = 0;
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 149) else if (!(S_ISBLK(mode) || S_ISCHR(mode)))
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 150) return -EINVAL;
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 151)
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 152) dentry = kern_path_create(AT_FDCWD, filename, &path, 0);
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 153) if (IS_ERR(dentry))
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 154) return PTR_ERR(dentry);
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 155)
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 156) if (!IS_POSIXACL(path.dentry->d_inode))
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 157) mode &= ~current_umask();
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 158) error = security_path_mknod(&path, dentry, mode, dev);
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 159) if (!error)
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 160) error = vfs_mknod(mnt_user_ns(path.mnt), path.dentry->d_inode,
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 161) dentry, mode, new_decode_dev(dev));
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 162) done_path_create(&path, dentry);
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 163) return error;
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 164) }
5fee64fcde077 (Christoph Hellwig 2020-07-22 11:41:20 +0200 165)
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 166) int __init init_link(const char *oldname, const char *newname)
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 167) {
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 168) struct dentry *new_dentry;
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 169) struct path old_path, new_path;
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 170) struct user_namespace *mnt_userns;
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 171) int error;
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 172)
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 173) error = kern_path(oldname, 0, &old_path);
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 174) if (error)
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 175) return error;
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 176)
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 177) new_dentry = kern_path_create(AT_FDCWD, newname, &new_path, 0);
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 178) error = PTR_ERR(new_dentry);
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 179) if (IS_ERR(new_dentry))
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 180) goto out;
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 181)
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 182) error = -EXDEV;
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 183) if (old_path.mnt != new_path.mnt)
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 184) goto out_dput;
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 185) mnt_userns = mnt_user_ns(new_path.mnt);
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 186) error = may_linkat(mnt_userns, &old_path);
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 187) if (unlikely(error))
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 188) goto out_dput;
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 189) error = security_path_link(old_path.dentry, &new_path, new_dentry);
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 190) if (error)
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 191) goto out_dput;
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 192) error = vfs_link(old_path.dentry, mnt_userns, new_path.dentry->d_inode,
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 193) new_dentry, NULL);
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 194) out_dput:
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 195) done_path_create(&new_path, new_dentry);
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 196) out:
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 197) path_put(&old_path);
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 198) return error;
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 199) }
812931d693da5 (Christoph Hellwig 2020-07-22 11:14:19 +0200 200)
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 201) int __init init_symlink(const char *oldname, const char *newname)
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 202) {
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 203) struct dentry *dentry;
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 204) struct path path;
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 205) int error;
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 206)
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 207) dentry = kern_path_create(AT_FDCWD, newname, &path, 0);
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 208) if (IS_ERR(dentry))
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 209) return PTR_ERR(dentry);
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 210) error = security_path_symlink(&path, dentry, oldname);
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 211) if (!error)
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 212) error = vfs_symlink(mnt_user_ns(path.mnt), path.dentry->d_inode,
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 213) dentry, oldname);
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 214) done_path_create(&path, dentry);
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 215) return error;
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 216) }
cd3acb6a79349 (Christoph Hellwig 2020-07-22 11:14:36 +0200 217)
8fb9f73e5a539 (Christoph Hellwig 2020-07-23 08:23:40 +0200 218) int __init init_unlink(const char *pathname)
8fb9f73e5a539 (Christoph Hellwig 2020-07-23 08:23:40 +0200 219) {
8fb9f73e5a539 (Christoph Hellwig 2020-07-23 08:23:40 +0200 220) return do_unlinkat(AT_FDCWD, getname_kernel(pathname));
8fb9f73e5a539 (Christoph Hellwig 2020-07-23 08:23:40 +0200 221) }
20cce026c3e09 (Christoph Hellwig 2020-07-22 11:11:45 +0200 222)
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 223) int __init init_mkdir(const char *pathname, umode_t mode)
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 224) {
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 225) struct dentry *dentry;
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 226) struct path path;
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 227) int error;
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 228)
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 229) dentry = kern_path_create(AT_FDCWD, pathname, &path, LOOKUP_DIRECTORY);
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 230) if (IS_ERR(dentry))
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 231) return PTR_ERR(dentry);
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 232) if (!IS_POSIXACL(path.dentry->d_inode))
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 233) mode &= ~current_umask();
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 234) error = security_path_mkdir(&path, dentry, mode);
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 235) if (!error)
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 236) error = vfs_mkdir(mnt_user_ns(path.mnt), path.dentry->d_inode,
b816dd5ddeae3 (Christian Brauner 2021-01-21 14:19:39 +0100 237) dentry, mode);
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 238) done_path_create(&path, dentry);
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 239) return error;
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 240) }
83ff98c3e9cd2 (Christoph Hellwig 2020-07-22 11:14:59 +0200 241)
20cce026c3e09 (Christoph Hellwig 2020-07-22 11:11:45 +0200 242) int __init init_rmdir(const char *pathname)
20cce026c3e09 (Christoph Hellwig 2020-07-22 11:11:45 +0200 243) {
20cce026c3e09 (Christoph Hellwig 2020-07-22 11:11:45 +0200 244) return do_rmdir(AT_FDCWD, getname_kernel(pathname));
20cce026c3e09 (Christoph Hellwig 2020-07-22 11:11:45 +0200 245) }
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 246)
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 247) int __init init_utimes(char *filename, struct timespec64 *ts)
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 248) {
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 249) struct path path;
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 250) int error;
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 251)
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 252) error = kern_path(filename, 0, &path);
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 253) if (error)
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 254) return error;
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 255) error = vfs_utimes(&path, ts);
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 256) path_put(&path);
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 257) return error;
235e57935bf32 (Christoph Hellwig 2020-07-21 16:05:31 +0200 258) }
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 259)
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 260) int __init init_dup(struct file *file)
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 261) {
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 262) int fd;
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 263)
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 264) fd = get_unused_fd_flags(0);
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 265) if (fd < 0)
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 266) return fd;
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 267) fd_install(fd, get_file(file));
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 268) return 0;
f073531070d24 (Christoph Hellwig 2020-07-28 17:49:47 +0200 269) }
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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