@@ -258,7 +258,7 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
if (value) {
/* update the cached acl value */
@@ -251,7 +251,7 @@ int v9fs_init_inode(struct v9fs_session_info *v9ses,
{
int err = 0;
- inode_init_owner(inode, NULL, mode);
+ inode_init_owner(inode, &init_user_ns, NULL, mode);
inode->i_blocks = 0;
inode->i_rdev = rdev;
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
@@ -87,7 +87,7 @@ int setattr_prepare(struct dentry *dentry, struct iattr *attr)
/* Make sure a caller can chmod. */
if (ia_valid & ATTR_MODE) {
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
/* Also check the setgid bit! */
if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
@@ -98,7 +98,7 @@ int setattr_prepare(struct dentry *dentry, struct iattr *attr)
/* Check for setting the inode time. */
if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) {
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
}
@@ -243,7 +243,7 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
if (IS_IMMUTABLE(inode))
return -EPERM;
- if (!inode_owner_or_capable(inode)) {
+ if (!inode_owner_or_capable(&init_user_ns, inode)) {
error = inode_permission(&init_user_ns, inode,
MAY_WRITE);
if (error)
@@ -96,7 +96,7 @@ static int bfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
}
set_bit(ino, info->si_imap);
info->si_freei--;
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
inode->i_blocks = 0;
inode->i_op = &bfs_file_inops;
@@ -6015,7 +6015,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
if (ret != 0)
goto fail_unlock;
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode_set_bytes(inode, 0);
inode->i_mtime = current_time(inode);
@@ -205,7 +205,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
const char *comp = NULL;
u32 binode_flags;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
if (btrfs_root_readonly(root))
@@ -417,7 +417,7 @@ static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
unsigned old_i_flags;
int ret = 0;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
if (btrfs_root_readonly(root))
@@ -1811,7 +1811,7 @@ static noinline int __btrfs_ioctl_snap_create(struct file *file,
btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
"Snapshot src from another FS");
ret = -EXDEV;
- } else if (!inode_owner_or_capable(src_inode)) {
+ } else if (!inode_owner_or_capable(&init_user_ns, src_inode)) {
/*
* Subvolume creation is not restricted, but snapshots
* are limited to own subvolumes only
@@ -1931,7 +1931,7 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
u64 flags;
int ret = 0;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
ret = mnt_want_write_file(file);
@@ -4401,7 +4401,7 @@ static long _btrfs_ioctl_set_received_subvol(struct file *file,
int ret = 0;
int received_uuid_changed;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
ret = mnt_want_write_file(file);
@@ -56,7 +56,7 @@ struct inode *btrfs_new_test_inode(void)
inode = new_inode(test_mnt->mnt_sb);
if (inode)
- inode_init_owner(inode, NULL, S_IFREG);
+ inode_init_owner(inode, &init_user_ns, NULL, S_IFREG);
return inode;
}
@@ -462,7 +462,7 @@ int fscrypt_ioctl_set_policy(struct file *filp, const void __user *arg)
return -EFAULT;
policy.version = version;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@@ -137,7 +137,7 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg)
unsigned int oldflags = efivarfs_getflags(inode);
int error;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (copy_from_user(&flags, arg, sizeof(flags)))
@@ -551,7 +551,7 @@ struct inode *ext2_new_inode(struct inode *dir, umode_t mode,
inode->i_uid = current_fsuid();
inode->i_gid = dir->i_gid;
} else
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_ino = ino;
inode->i_blocks = 0;
@@ -39,7 +39,7 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (ret)
return ret;
- if (!inode_owner_or_capable(inode)) {
+ if (!inode_owner_or_capable(&init_user_ns, inode)) {
ret = -EACCES;
goto setflags_out;
}
@@ -84,7 +84,7 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case EXT2_IOC_SETVERSION: {
__u32 generation;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
ret = mnt_want_write_file(filp);
if (ret)
@@ -117,7 +117,7 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
return -ENOTTY;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (get_user(rsv_window_size, (int __user *)arg))
@@ -972,7 +972,7 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
inode->i_uid = current_fsuid();
inode->i_gid = dir->i_gid;
} else
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
if (ext4_has_feature_project(sb) &&
ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT))
@@ -139,7 +139,7 @@ static long swap_inode_boot_loader(struct super_block *sb,
}
if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
- !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
+ !inode_owner_or_capable(&init_user_ns, inode) || !capable(CAP_SYS_ADMIN)) {
err = -EPERM;
goto journal_err_out;
}
@@ -829,7 +829,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case FS_IOC_SETFLAGS: {
int err;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
@@ -871,7 +871,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
__u32 generation;
int err;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
if (ext4_has_metadata_csum(inode->i_sb)) {
@@ -1010,7 +1010,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case EXT4_IOC_MIGRATE:
{
int err;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
err = mnt_want_write_file(filp);
@@ -1032,7 +1032,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case EXT4_IOC_ALLOC_DA_BLKS:
{
int err;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
err = mnt_want_write_file(filp);
@@ -1214,7 +1214,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case EXT4_IOC_CLEAR_ES_CACHE:
{
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ext4_clear_inode_es(inode);
return 0;
@@ -1260,7 +1260,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return -EFAULT;
/* Make sure caller has proper permission */
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
@@ -1955,7 +1955,7 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
u32 iflags;
int ret;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (get_user(fsflags, (int __user *)arg))
@@ -2002,7 +2002,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
int ret;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (!S_ISREG(inode->i_mode))
@@ -2069,7 +2069,7 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
struct inode *inode = file_inode(filp);
int ret;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@@ -2111,7 +2111,7 @@ static int f2fs_ioc_start_volatile_write(struct file *filp)
struct inode *inode = file_inode(filp);
int ret;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (!S_ISREG(inode->i_mode))
@@ -2146,7 +2146,7 @@ static int f2fs_ioc_release_volatile_write(struct file *filp)
struct inode *inode = file_inode(filp);
int ret;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@@ -2175,7 +2175,7 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp)
struct inode *inode = file_inode(filp);
int ret;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@@ -3153,7 +3153,7 @@ static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
return -EFAULT;
/* Make sure caller has proper permission */
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (fa.fsx_xflags & ~F2FS_SUPPORTED_XFLAGS)
@@ -46,7 +46,7 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
nid_free = true;
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_ino = ino;
inode->i_blocks = 0;
@@ -114,7 +114,7 @@ static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
unsigned char old_advise = F2FS_I(inode)->i_advise;
unsigned char new_advise;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
if (value == NULL)
return -EINVAL;
@@ -46,7 +46,7 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
/* O_NOATIME can only be set by the owner or superuser */
if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME))
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
/* required for strict SunOS emulation */
@@ -238,7 +238,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
goto out;
error = -EACCES;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
goto out;
error = 0;
@@ -376,7 +376,7 @@ struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
return NULL;
inode->i_ino = sbi->next_cnid++;
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
set_nlink(inode, 1);
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
@@ -91,7 +91,7 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
if (err)
goto out;
- if (!inode_owner_or_capable(inode)) {
+ if (!inode_owner_or_capable(&init_user_ns, inode)) {
err = -EACCES;
goto out_drop_write;
}
@@ -836,7 +836,7 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode);
inode->i_ino = get_next_ino();
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
lockdep_set_class(&inode->i_mapping->i_mmap_rwsem,
&hugetlbfs_i_mmap_rwsem_key);
inode->i_mapping->a_ops = &hugetlbfs_aops;
@@ -2132,13 +2132,14 @@ EXPORT_SYMBOL(init_special_inode);
/**
* inode_init_owner - Init uid,gid,mode for new inode according to posix standards
* @inode: New inode
+ * @user_ns: User namespace the inode is accessed from
* @dir: Directory inode
* @mode: mode of the new inode
*/
-void inode_init_owner(struct inode *inode, const struct inode *dir,
- umode_t mode)
+void inode_init_owner(struct inode *inode, struct user_namespace *user_ns,
+ const struct inode *dir, umode_t mode)
{
- inode->i_uid = current_fsuid();
+ inode->i_uid = fsuid_into_mnt(user_ns);
if (dir && dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
@@ -2146,31 +2147,35 @@ void inode_init_owner(struct inode *inode, const struct inode *dir,
if (S_ISDIR(mode))
mode |= S_ISGID;
else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
- !in_group_p(inode->i_gid) &&
- !capable_wrt_inode_uidgid(&init_user_ns, dir, CAP_FSETID))
+ !in_group_p(i_gid_into_mnt(user_ns, inode)) &&
+ !capable_wrt_inode_uidgid(user_ns, dir, CAP_FSETID))
mode &= ~S_ISGID;
} else
- inode->i_gid = current_fsgid();
+ inode->i_gid = fsgid_into_mnt(user_ns);
inode->i_mode = mode;
}
EXPORT_SYMBOL(inode_init_owner);
/**
* inode_owner_or_capable - check current task permissions to inode
+ * @user_ns: User namespace the inode is accessed from
* @inode: inode being checked
*
* Return true if current either has CAP_FOWNER in a namespace with the
* inode owner uid mapped, or owns the file.
*/
-bool inode_owner_or_capable(const struct inode *inode)
+bool inode_owner_or_capable(struct user_namespace *user_ns,
+ const struct inode *inode)
{
+ kuid_t i_uid;
struct user_namespace *ns;
- if (uid_eq(current_fsuid(), inode->i_uid))
+ i_uid = i_uid_into_mnt(user_ns, inode);
+ if (uid_eq(current_fsuid(), i_uid))
return true;
ns = current_user_ns();
- if (kuid_has_mapping(ns, inode->i_uid) && ns_capable(ns, CAP_FOWNER))
+ if (kuid_has_mapping(ns, i_uid) && ns_capable(ns, CAP_FOWNER))
return true;
return false;
}
@@ -76,7 +76,7 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (err)
return err;
- if (!inode_owner_or_capable(inode)) {
+ if (!inode_owner_or_capable(&init_user_ns, inode)) {
err = -EACCES;
goto setflags_out;
}
@@ -64,7 +64,7 @@ struct inode *ialloc(struct inode *parent, umode_t mode)
goto fail_put;
}
- inode_init_owner(inode, parent, mode);
+ inode_init_owner(inode, &init_user_ns, parent, mode);
/*
* New inodes need to save sane values on disk when
* uid & gid mount options are used
@@ -252,7 +252,7 @@ struct inode *minix_new_inode(const struct inode *dir, umode_t mode, int *error)
iput(inode);
return NULL;
}
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_ino = j;
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
inode->i_blocks = 0;
@@ -1047,7 +1047,7 @@ int may_linkat(struct path *link)
/* Source inode owner (or CAP_FOWNER) can hardlink all they like,
* otherwise, it must be a safe source.
*/
- if (safe_hardlink_source(inode) || inode_owner_or_capable(inode))
+ if (safe_hardlink_source(inode) || inode_owner_or_capable(&init_user_ns, inode))
return 0;
audit_log_path_denied(AUDIT_ANOM_LINK, "linkat");
@@ -2897,7 +2897,7 @@ static int may_open(const struct path *path, int acc_mode, int flag)
}
/* O_NOATIME can only be set by the owner or superuser */
- if (flag & O_NOATIME && !inode_owner_or_capable(inode))
+ if (flag & O_NOATIME && !inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
return 0;
@@ -348,7 +348,7 @@ struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
/* reference count of i_bh inherits from nilfs_mdt_read_block() */
atomic64_inc(&root->inodes_count);
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_ino = ino;
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
@@ -132,7 +132,7 @@ static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
unsigned int flags, oldflags;
int ret;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (get_user(flags, (int __user *)argp))
@@ -329,7 +329,7 @@ static struct inode *dlmfs_get_root_inode(struct super_block *sb)
if (inode) {
inode->i_ino = get_next_ino();
- inode_init_owner(inode, NULL, mode);
+ inode_init_owner(inode, &init_user_ns, NULL, mode);
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
inc_nlink(inode);
@@ -352,7 +352,7 @@ static struct inode *dlmfs_get_inode(struct inode *parent,
return NULL;
inode->i_ino = get_next_ino();
- inode_init_owner(inode, parent, mode);
+ inode_init_owner(inode, &init_user_ns, parent, mode);
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
ip = DLMFS_I(inode);
@@ -96,7 +96,7 @@ static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
}
status = -EACCES;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
goto bail_unlock;
if (!S_ISDIR(inode->i_mode))
@@ -198,7 +198,7 @@ static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
* callers. */
if (S_ISDIR(mode))
set_nlink(inode, 2);
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
status = dquot_initialize(inode);
if (status)
return ERR_PTR(status);
@@ -48,7 +48,7 @@ struct inode *omfs_new_inode(struct inode *dir, umode_t mode)
goto fail;
inode->i_ino = new_block;
- inode_init_owner(inode, NULL, mode);
+ inode_init_owner(inode, &init_user_ns, NULL, mode);
inode->i_mapping->a_ops = &omfs_aops;
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
@@ -636,7 +636,7 @@ static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
inode->i_state |= I_CREATING;
spin_unlock(&inode->i_lock);
- inode_init_owner(inode, dentry->d_parent->d_inode, mode);
+ inode_init_owner(inode, &init_user_ns, dentry->d_parent->d_inode, mode);
attr.mode = inode->i_mode;
err = ovl_create_or_link(dentry, inode, &attr, false);
@@ -53,7 +53,7 @@ static struct file *ovl_open_realfile(const struct file *file,
err = inode_permission(&init_user_ns, realinode, MAY_OPEN | acc_mode);
if (err) {
realfile = ERR_PTR(err);
- } else if (!inode_owner_or_capable(realinode)) {
+ } else if (!inode_owner_or_capable(&init_user_ns, realinode)) {
realfile = ERR_PTR(-EPERM);
} else {
realfile = open_with_fake_path(&file->f_path, flags, realinode,
@@ -582,7 +582,7 @@ static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd,
struct inode *inode = file_inode(file);
unsigned int oldflags;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(file);
@@ -960,7 +960,7 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
goto out_acl_release;
}
err = -EPERM;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
goto out_acl_release;
posix_acl_release(acl);
@@ -481,7 +481,7 @@ struct file *ovl_path_open(struct path *path, int flags)
return ERR_PTR(err);
/* O_NOATIME is an optimization, don't fail if not permitted */
- if (inode_owner_or_capable(inode))
+ if (inode_owner_or_capable(&init_user_ns, inode))
flags |= O_NOATIME;
return dentry_open(path, flags, current_cred());
@@ -874,7 +874,7 @@ set_posix_acl(struct inode *inode, int type, struct posix_acl *acl)
if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
return acl ? -EACCES : 0;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
if (acl) {
@@ -67,7 +67,7 @@ struct inode *ramfs_get_inode(struct super_block *sb,
if (inode) {
inode->i_ino = get_next_ino();
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_mapping->a_ops = &ramfs_aops;
mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
mapping_set_unevictable(inode->i_mapping);
@@ -59,7 +59,7 @@ long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (err)
break;
- if (!inode_owner_or_capable(inode)) {
+ if (!inode_owner_or_capable(&init_user_ns, inode)) {
err = -EPERM;
goto setflags_out;
}
@@ -101,7 +101,7 @@ long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
err = put_user(inode->i_generation, (int __user *)arg);
break;
case REISERFS_IOC_SETVERSION:
- if (!inode_owner_or_capable(inode)) {
+ if (!inode_owner_or_capable(&init_user_ns, inode)) {
err = -EPERM;
break;
}
@@ -615,7 +615,7 @@ static int new_inode_init(struct inode *inode, struct inode *dir, umode_t mode)
* the quota init calls have to know who to charge the quota to, so
* we have to set uid and gid here
*/
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
return dquot_initialize(inode);
}
@@ -163,7 +163,7 @@ struct inode * sysv_new_inode(const struct inode * dir, umode_t mode)
*sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
fs16_add(sbi, sbi->s_sb_total_free_inodes, -1);
dirty_sb(sb);
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_ino = fs16_to_cpu(sbi, ino);
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
inode->i_blocks = 0;
@@ -94,7 +94,7 @@ struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
*/
inode->i_flags |= S_NOCMTIME;
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_mtime = inode->i_atime = inode->i_ctime =
current_time(inode);
inode->i_mapping->nrpages = 0;
@@ -155,7 +155,7 @@ long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (IS_RDONLY(inode))
return -EROFS;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
@@ -103,7 +103,7 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode)
mutex_unlock(&sbi->s_alloc_mutex);
}
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
inode->i_uid = sbi->s_uid;
if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
@@ -289,7 +289,7 @@ struct inode *ufs_new_inode(struct inode *dir, umode_t mode)
ufs_mark_sb_dirty(sb);
inode->i_ino = cg * uspi->s_ipg + bit;
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_blocks = 0;
inode->i_generation = 0;
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
@@ -127,7 +127,7 @@ xattr_permission(struct inode *inode, const char *name, int mask)
if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
return (mask & MAY_WRITE) ? -EPERM : -ENODATA;
if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
- (mask & MAY_WRITE) && !inode_owner_or_capable(inode))
+ (mask & MAY_WRITE) && !inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
}
@@ -1300,7 +1300,7 @@ xfs_ioctl_setattr_get_trans(
* The user ID of the calling process must be equal to the file owner
* ID, except in cases where the CAP_FSETID capability is applicable.
*/
- if (!inode_owner_or_capable(VFS_I(ip))) {
+ if (!inode_owner_or_capable(&init_user_ns, VFS_I(ip))) {
error = -EPERM;
goto out_cancel;
}
@@ -1221,7 +1221,7 @@ static void zonefs_init_dir_inode(struct inode *parent, struct inode *inode,
struct super_block *sb = parent->i_sb;
inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk) + type + 1;
- inode_init_owner(inode, parent, S_IFDIR | 0555);
+ inode_init_owner(inode, &init_user_ns, parent, S_IFDIR | 0555);
inode->i_op = &zonefs_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
set_nlink(inode, 2);
@@ -1760,7 +1760,7 @@ static inline bool sb_start_intwrite_trylock(struct super_block *sb)
}
-extern bool inode_owner_or_capable(const struct inode *inode);
+extern bool inode_owner_or_capable(struct user_namespace *user_ns, const struct inode *inode);
/*
* VFS helper functions..
@@ -1802,8 +1802,9 @@ extern long compat_ptr_ioctl(struct file *file, unsigned int cmd,
/*
* VFS file helper functions.
*/
-extern void inode_init_owner(struct inode *inode, const struct inode *dir,
- umode_t mode);
+extern void inode_init_owner(struct inode *inode,
+ struct user_namespace *user_ns,
+ const struct inode *dir, umode_t mode);
extern bool may_open_dev(const struct path *path);
/*
@@ -122,7 +122,7 @@ static struct inode *bpf_get_inode(struct super_block *sb,
inode->i_mtime = inode->i_atime;
inode->i_ctime = inode->i_atime;
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
return inode;
}
@@ -539,7 +539,7 @@ static inline bool can_do_pageout(struct vm_area_struct *vma)
* otherwise we'd be including shared non-exclusive mappings, which
* opens a side channel.
*/
- return inode_owner_or_capable(file_inode(vma->vm_file)) ||
+ return inode_owner_or_capable(&init_user_ns, file_inode(vma->vm_file)) ||
inode_permission(&init_user_ns, file_inode(vma->vm_file), MAY_WRITE) == 0;
}
@@ -166,7 +166,7 @@ static inline bool can_do_mincore(struct vm_area_struct *vma)
* for writing; otherwise we'd be including shared non-exclusive
* mappings, which opens a side channel.
*/
- return inode_owner_or_capable(file_inode(vma->vm_file)) ||
+ return inode_owner_or_capable(&init_user_ns, file_inode(vma->vm_file)) ||
inode_permission(&init_user_ns, file_inode(vma->vm_file), MAY_WRITE) == 0;
}
@@ -2303,7 +2303,7 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
inode = new_inode(sb);
if (inode) {
inode->i_ino = ino;
- inode_init_owner(inode, dir, mode);
+ inode_init_owner(inode, &init_user_ns, dir, mode);
inode->i_blocks = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
inode->i_generation = prandom_u32();
@@ -3133,13 +3133,13 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
}
if (!selinux_initialized(&selinux_state))
- return (inode_owner_or_capable(inode) ? 0 : -EPERM);
+ return (inode_owner_or_capable(&init_user_ns, inode) ? 0 : -EPERM);
sbsec = inode->i_sb->s_security;
if (!(sbsec->flags & SBLABEL_MNT))
return -EOPNOTSUPP;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(&init_user_ns, inode))
return -EPERM;
ad.type = LSM_AUDIT_DATA_DENTRY;
The inode_owner_or_capable() helper determines whether the caller is the owner of the inode or is capable with respect to that inode. Allow it to handle idmapped mounts. If the inode is accessed through an idmapped mount we first need to map it according to the mount's user namespace. Afterwards the checks are identical to non-idmapped mounts. If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Similarly, we allow the inode_init_owner() helper to handle idmapped mounts. It initializes a new inode on idmapped mounts by mapping the fsuid and fsgid of the caller from the mount's user namespace. If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> --- /* v2 */ - Christoph Hellwig <hch@lst.de>: - Don't pollute the vfs with additional helpers simply extend the existing helpers with an additional argument and switch all callers. /* v3 */ unchanged --- fs/9p/acl.c | 2 +- fs/9p/vfs_inode.c | 2 +- fs/attr.c | 6 +++--- fs/bfs/dir.c | 2 +- fs/btrfs/inode.c | 2 +- fs/btrfs/ioctl.c | 10 +++++----- fs/btrfs/tests/btrfs-tests.c | 2 +- fs/crypto/policy.c | 2 +- fs/efivarfs/file.c | 2 +- fs/ext2/ialloc.c | 2 +- fs/ext2/ioctl.c | 6 +++--- fs/ext4/ialloc.c | 2 +- fs/ext4/ioctl.c | 14 +++++++------- fs/f2fs/file.c | 14 +++++++------- fs/f2fs/namei.c | 2 +- fs/f2fs/xattr.c | 2 +- fs/fcntl.c | 2 +- fs/gfs2/file.c | 2 +- fs/hfsplus/inode.c | 2 +- fs/hfsplus/ioctl.c | 2 +- fs/hugetlbfs/inode.c | 2 +- fs/inode.c | 23 ++++++++++++++--------- fs/jfs/ioctl.c | 2 +- fs/jfs/jfs_inode.c | 2 +- fs/minix/bitmap.c | 2 +- fs/namei.c | 4 ++-- fs/nilfs2/inode.c | 2 +- fs/nilfs2/ioctl.c | 2 +- fs/ocfs2/dlmfs/dlmfs.c | 4 ++-- fs/ocfs2/ioctl.c | 2 +- fs/ocfs2/namei.c | 2 +- fs/omfs/inode.c | 2 +- fs/overlayfs/dir.c | 2 +- fs/overlayfs/file.c | 4 ++-- fs/overlayfs/super.c | 2 +- fs/overlayfs/util.c | 2 +- fs/posix_acl.c | 2 +- fs/ramfs/inode.c | 2 +- fs/reiserfs/ioctl.c | 4 ++-- fs/reiserfs/namei.c | 2 +- fs/sysv/ialloc.c | 2 +- fs/ubifs/dir.c | 2 +- fs/ubifs/ioctl.c | 2 +- fs/udf/ialloc.c | 2 +- fs/ufs/ialloc.c | 2 +- fs/xattr.c | 2 +- fs/xfs/xfs_ioctl.c | 2 +- fs/zonefs/super.c | 2 +- include/linux/fs.h | 7 ++++--- kernel/bpf/inode.c | 2 +- mm/madvise.c | 2 +- mm/mincore.c | 2 +- mm/shmem.c | 2 +- security/selinux/hooks.c | 4 ++-- 54 files changed, 95 insertions(+), 89 deletions(-)