Re: [PATCH v1 1/5] hostfs: Fix ephemeral inodes

["Mickaël Salaün" <mic@digikod.net>]

On 06/06/2023 15:12, Roberto Sassu wrote:
> On Thu, 2023-03-09 at 17:54 +0100, Mickaël Salaün wrote:
>> hostfs creates a new inode for each opened or created file, which created
>> useless inode allocations and forbade identifying a host file with a kernel
>> inode.
>>
>> Fix this uncommon filesystem behavior by tying kernel inodes to host
>> file's inode and device IDs.  Even if the host filesystem inodes may be
>> recycled, this cannot happen while a file referencing it is open, which
>> is the case with hostfs.  It should be noted that hostfs inode IDs may
>> not be unique for the same hostfs superblock because multiple host's
>> (backed) superblocks may be used.
> 
> I hoped that this patch solved an issue when testing the
> inode_setsecurity and inode_getsecurity combination. Unfortunately, it
> does not work, since after inode_setsecurity the inode is dropped. At
> the time inode_getsecurity is called, the security blob is lost.

Indeed, this is because inode[sg]etsecurity() rely on inode's xattr, 
which are not handled by hostfs. Why not simply use overlayfs with an 
upper tmpfs that supports xattr? This patch might be needed to such 
scenario though.


> 
> Roberto
> 
>> Delete inodes when dropping them to force backed host's file descriptors
>> closing.
>>
>> This enables to entirely remove ARCH_EPHEMERAL_INODES, and then makes
>> Landlock fully supported by UML.  This is very useful for testing
>> (ongoing and backported) changes.
>>
>> These changes also factor out and simplify some helpers thanks to the
>> new hostfs_inode_update() and the hostfs_iget() revamp: read_name(),
>> hostfs_create(), hostfs_lookup(), hostfs_mknod(), and
>> hostfs_fill_sb_common().
>>
>> A following commit with new Landlock tests check this new hostfs inode
>> consistency.
>>
>> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
>> Cc: Johannes Berg <johannes@sipsolutions.net>
>> Cc: Richard Weinberger <richard@nod.at>
>> Cc: <stable@vger.kernel.org> # 5.15.x: ce72750f04d6: hostfs: Fix writeback of dirty pages
>> Cc: <stable@vger.kernel.org> # 5.15+
>> Signed-off-by: Mickaël Salaün <mic@digikod.net>
>> Link: https://lore.kernel.org/r/20230309165455.175131-2-mic@digikod.net
>> ---
>>   arch/Kconfig              |   7 --
>>   arch/um/Kconfig           |   1 -
>>   fs/hostfs/hostfs.h        |   1 +
>>   fs/hostfs/hostfs_kern.c   | 213 +++++++++++++++++++-------------------
>>   fs/hostfs/hostfs_user.c   |   1 +
>>   security/landlock/Kconfig |   2 +-
>>   6 files changed, 109 insertions(+), 116 deletions(-)
>>
>> diff --git a/arch/Kconfig b/arch/Kconfig
>> index e3511afbb7f2..d5f0841ac3c1 100644
>> --- a/arch/Kconfig
>> +++ b/arch/Kconfig
>> @@ -1156,13 +1156,6 @@ config COMPAT_32BIT_TIME
>>   config ARCH_NO_PREEMPT
>>   	bool
>>   
>> -config ARCH_EPHEMERAL_INODES
>> -	def_bool n
>> -	help
>> -	  An arch should select this symbol if it doesn't keep track of inode
>> -	  instances on its own, but instead relies on something else (e.g. the
>> -	  host kernel for an UML kernel).
>> -
>>   config ARCH_SUPPORTS_RT
>>   	bool
>>   
>> diff --git a/arch/um/Kconfig b/arch/um/Kconfig
>> index 541a9b18e343..4057d5267c6a 100644
>> --- a/arch/um/Kconfig
>> +++ b/arch/um/Kconfig
>> @@ -5,7 +5,6 @@ menu "UML-specific options"
>>   config UML
>>   	bool
>>   	default y
>> -	select ARCH_EPHEMERAL_INODES
>>   	select ARCH_HAS_FORTIFY_SOURCE
>>   	select ARCH_HAS_GCOV_PROFILE_ALL
>>   	select ARCH_HAS_KCOV
>> diff --git a/fs/hostfs/hostfs.h b/fs/hostfs/hostfs.h
>> index 69cb796f6270..0239e3af3945 100644
>> --- a/fs/hostfs/hostfs.h
>> +++ b/fs/hostfs/hostfs.h
>> @@ -65,6 +65,7 @@ struct hostfs_stat {
>>   	unsigned long long blocks;
>>   	unsigned int maj;
>>   	unsigned int min;
>> +	dev_t dev;
>>   };
>>   
>>   extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
>> diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
>> index 28b4f15c19eb..19496f732016 100644
>> --- a/fs/hostfs/hostfs_kern.c
>> +++ b/fs/hostfs/hostfs_kern.c
>> @@ -26,6 +26,7 @@ struct hostfs_inode_info {
>>   	fmode_t mode;
>>   	struct inode vfs_inode;
>>   	struct mutex open_mutex;
>> +	dev_t dev;
>>   };
>>   
>>   static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
>> @@ -182,14 +183,6 @@ static char *follow_link(char *link)
>>   	return ERR_PTR(n);
>>   }
>>   
>> -static struct inode *hostfs_iget(struct super_block *sb)
>> -{
>> -	struct inode *inode = new_inode(sb);
>> -	if (!inode)
>> -		return ERR_PTR(-ENOMEM);
>> -	return inode;
>> -}
>> -
>>   static int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
>>   {
>>   	/*
>> @@ -228,6 +221,7 @@ static struct inode *hostfs_alloc_inode(struct super_block *sb)
>>   		return NULL;
>>   	hi->fd = -1;
>>   	hi->mode = 0;
>> +	hi->dev = 0;
>>   	inode_init_once(&hi->vfs_inode);
>>   	mutex_init(&hi->open_mutex);
>>   	return &hi->vfs_inode;
>> @@ -240,6 +234,7 @@ static void hostfs_evict_inode(struct inode *inode)
>>   	if (HOSTFS_I(inode)->fd != -1) {
>>   		close_file(&HOSTFS_I(inode)->fd);
>>   		HOSTFS_I(inode)->fd = -1;
>> +		HOSTFS_I(inode)->dev = 0;
>>   	}
>>   }
>>   
>> @@ -265,6 +260,7 @@ static int hostfs_show_options(struct seq_file *seq, struct dentry *root)
>>   static const struct super_operations hostfs_sbops = {
>>   	.alloc_inode	= hostfs_alloc_inode,
>>   	.free_inode	= hostfs_free_inode,
>> +	.drop_inode	= generic_delete_inode,
>>   	.evict_inode	= hostfs_evict_inode,
>>   	.statfs		= hostfs_statfs,
>>   	.show_options	= hostfs_show_options,
>> @@ -512,18 +508,31 @@ static const struct address_space_operations hostfs_aops = {
>>   	.write_end	= hostfs_write_end,
>>   };
>>   
>> -static int read_name(struct inode *ino, char *name)
>> +static int hostfs_inode_update(struct inode *ino, const struct hostfs_stat *st)
>> +{
>> +	set_nlink(ino, st->nlink);
>> +	i_uid_write(ino, st->uid);
>> +	i_gid_write(ino, st->gid);
>> +	ino->i_atime =
>> +		(struct timespec64){ st->atime.tv_sec, st->atime.tv_nsec };
>> +	ino->i_mtime =
>> +		(struct timespec64){ st->mtime.tv_sec, st->mtime.tv_nsec };
>> +	ino->i_ctime =
>> +		(struct timespec64){ st->ctime.tv_sec, st->ctime.tv_nsec };
>> +	ino->i_size = st->size;
>> +	ino->i_blocks = st->blocks;
>> +	return 0;
>> +}
>> +
>> +static int hostfs_inode_set(struct inode *ino, void *data)
>>   {
>> +	struct hostfs_stat *st = data;
>>   	dev_t rdev;
>> -	struct hostfs_stat st;
>> -	int err = stat_file(name, &st, -1);
>> -	if (err)
>> -		return err;
>>   
>>   	/* Reencode maj and min with the kernel encoding.*/
>> -	rdev = MKDEV(st.maj, st.min);
>> +	rdev = MKDEV(st->maj, st->min);
>>   
>> -	switch (st.mode & S_IFMT) {
>> +	switch (st->mode & S_IFMT) {
>>   	case S_IFLNK:
>>   		ino->i_op = &hostfs_link_iops;
>>   		break;
>> @@ -535,7 +544,7 @@ static int read_name(struct inode *ino, char *name)
>>   	case S_IFBLK:
>>   	case S_IFIFO:
>>   	case S_IFSOCK:
>> -		init_special_inode(ino, st.mode & S_IFMT, rdev);
>> +		init_special_inode(ino, st->mode & S_IFMT, rdev);
>>   		ino->i_op = &hostfs_iops;
>>   		break;
>>   	case S_IFREG:
>> @@ -547,17 +556,42 @@ static int read_name(struct inode *ino, char *name)
>>   		return -EIO;
>>   	}
>>   
>> -	ino->i_ino = st.ino;
>> -	ino->i_mode = st.mode;
>> -	set_nlink(ino, st.nlink);
>> -	i_uid_write(ino, st.uid);
>> -	i_gid_write(ino, st.gid);
>> -	ino->i_atime = (struct timespec64){ st.atime.tv_sec, st.atime.tv_nsec };
>> -	ino->i_mtime = (struct timespec64){ st.mtime.tv_sec, st.mtime.tv_nsec };
>> -	ino->i_ctime = (struct timespec64){ st.ctime.tv_sec, st.ctime.tv_nsec };
>> -	ino->i_size = st.size;
>> -	ino->i_blocks = st.blocks;
>> -	return 0;
>> +	HOSTFS_I(ino)->dev = st->dev;
>> +	ino->i_ino = st->ino;
>> +	ino->i_mode = st->mode;
>> +	return hostfs_inode_update(ino, st);
>> +}
>> +
>> +static int hostfs_inode_test(struct inode *inode, void *data)
>> +{
>> +	const struct hostfs_stat *st = data;
>> +
>> +	return inode->i_ino == st->ino && HOSTFS_I(inode)->dev == st->dev;
>> +}
>> +
>> +static struct inode *hostfs_iget(struct super_block *sb, char *name)
>> +{
>> +	struct inode *inode;
>> +	struct hostfs_stat st;
>> +	int err = stat_file(name, &st, -1);
>> +
>> +	if (err)
>> +		return ERR_PTR(err);
>> +
>> +	inode = iget5_locked(sb, st.ino, hostfs_inode_test, hostfs_inode_set,
>> +			     &st);
>> +	if (!inode)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	if (inode->i_state & I_NEW) {
>> +		unlock_new_inode(inode);
>> +	} else {
>> +		spin_lock(&inode->i_lock);
>> +		hostfs_inode_update(inode, &st);
>> +		spin_unlock(&inode->i_lock);
>> +	}
>> +
>> +	return inode;
>>   }
>>   
>>   static int hostfs_create(struct mnt_idmap *idmap, struct inode *dir,
>> @@ -565,62 +599,48 @@ static int hostfs_create(struct mnt_idmap *idmap, struct inode *dir,
>>   {
>>   	struct inode *inode;
>>   	char *name;
>> -	int error, fd;
>> -
>> -	inode = hostfs_iget(dir->i_sb);
>> -	if (IS_ERR(inode)) {
>> -		error = PTR_ERR(inode);
>> -		goto out;
>> -	}
>> +	int fd;
>>   
>> -	error = -ENOMEM;
>>   	name = dentry_name(dentry);
>>   	if (name == NULL)
>> -		goto out_put;
>> +		return -ENOMEM;
>>   
>>   	fd = file_create(name, mode & 0777);
>> -	if (fd < 0)
>> -		error = fd;
>> -	else
>> -		error = read_name(inode, name);
>> +	if (fd < 0) {
>> +		__putname(name);
>> +		return fd;
>> +	}
>>   
>> +	inode = hostfs_iget(dir->i_sb, name);
>>   	__putname(name);
>> -	if (error)
>> -		goto out_put;
>> +	if (IS_ERR(inode))
>> +		return PTR_ERR(inode);
>>   
>>   	HOSTFS_I(inode)->fd = fd;
>>   	HOSTFS_I(inode)->mode = FMODE_READ | FMODE_WRITE;
>>   	d_instantiate(dentry, inode);
>>   	return 0;
>> -
>> - out_put:
>> -	iput(inode);
>> - out:
>> -	return error;
>>   }
>>   
>>   static struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
>>   				    unsigned int flags)
>>   {
>> -	struct inode *inode;
>> +	struct inode *inode = NULL;
>>   	char *name;
>> -	int err;
>> -
>> -	inode = hostfs_iget(ino->i_sb);
>> -	if (IS_ERR(inode))
>> -		goto out;
>>   
>> -	err = -ENOMEM;
>>   	name = dentry_name(dentry);
>> -	if (name) {
>> -		err = read_name(inode, name);
>> -		__putname(name);
>> -	}
>> -	if (err) {
>> -		iput(inode);
>> -		inode = (err == -ENOENT) ? NULL : ERR_PTR(err);
>> +	if (name == NULL)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	inode = hostfs_iget(ino->i_sb, name);
>> +	__putname(name);
>> +	if (IS_ERR(inode)) {
>> +		if (PTR_ERR(inode) == -ENOENT)
>> +			inode = NULL;
>> +		else
>> +			return ERR_CAST(inode);
>>   	}
>> - out:
>> +
>>   	return d_splice_alias(inode, dentry);
>>   }
>>   
>> @@ -704,35 +724,23 @@ static int hostfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
>>   	char *name;
>>   	int err;
>>   
>> -	inode = hostfs_iget(dir->i_sb);
>> -	if (IS_ERR(inode)) {
>> -		err = PTR_ERR(inode);
>> -		goto out;
>> -	}
>> -
>> -	err = -ENOMEM;
>>   	name = dentry_name(dentry);
>>   	if (name == NULL)
>> -		goto out_put;
>> +		return -ENOMEM;
>>   
>>   	err = do_mknod(name, mode, MAJOR(dev), MINOR(dev));
>> -	if (err)
>> -		goto out_free;
>> +	if (err) {
>> +		__putname(name);
>> +		return err;
>> +	}
>>   
>> -	err = read_name(inode, name);
>> +	inode = hostfs_iget(dir->i_sb, name);
>>   	__putname(name);
>> -	if (err)
>> -		goto out_put;
>> +	if (IS_ERR(inode))
>> +		return PTR_ERR(inode);
>>   
>>   	d_instantiate(dentry, inode);
>>   	return 0;
>> -
>> - out_free:
>> -	__putname(name);
>> - out_put:
>> -	iput(inode);
>> - out:
>> -	return err;
>>   }
>>   
>>   static int hostfs_rename2(struct mnt_idmap *idmap,
>> @@ -929,49 +937,40 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
>>   	sb->s_maxbytes = MAX_LFS_FILESIZE;
>>   	err = super_setup_bdi(sb);
>>   	if (err)
>> -		goto out;
>> +		return err;
>>   
>>   	/* NULL is printed as '(null)' by printf(): avoid that. */
>>   	if (req_root == NULL)
>>   		req_root = "";
>>   
>> -	err = -ENOMEM;
>>   	sb->s_fs_info = host_root_path =
>>   		kasprintf(GFP_KERNEL, "%s/%s", root_ino, req_root);
>>   	if (host_root_path == NULL)
>> -		goto out;
>> -
>> -	root_inode = new_inode(sb);
>> -	if (!root_inode)
>> -		goto out;
>> +		return -ENOMEM;
>>   
>> -	err = read_name(root_inode, host_root_path);
>> -	if (err)
>> -		goto out_put;
>> +	root_inode = hostfs_iget(sb, host_root_path);
>> +	if (IS_ERR(root_inode))
>> +		return PTR_ERR(root_inode);
>>   
>>   	if (S_ISLNK(root_inode->i_mode)) {
>> -		char *name = follow_link(host_root_path);
>> -		if (IS_ERR(name)) {
>> -			err = PTR_ERR(name);
>> -			goto out_put;
>> -		}
>> -		err = read_name(root_inode, name);
>> +		char *name;
>> +
>> +		iput(root_inode);
>> +		name = follow_link(host_root_path);
>> +		if (IS_ERR(name))
>> +			return PTR_ERR(name);
>> +
>> +		root_inode = hostfs_iget(sb, name);
>>   		kfree(name);
>> -		if (err)
>> -			goto out_put;
>> +		if (IS_ERR(root_inode))
>> +			return PTR_ERR(root_inode);
>>   	}
>>   
>> -	err = -ENOMEM;
>>   	sb->s_root = d_make_root(root_inode);
>>   	if (sb->s_root == NULL)
>> -		goto out;
>> +		return -ENOMEM;
>>   
>>   	return 0;
>> -
>> -out_put:
>> -	iput(root_inode);
>> -out:
>> -	return err;
>>   }
>>   
>>   static struct dentry *hostfs_read_sb(struct file_system_type *type,
>> diff --git a/fs/hostfs/hostfs_user.c b/fs/hostfs/hostfs_user.c
>> index 5ecc4706172b..840619e39a1a 100644
>> --- a/fs/hostfs/hostfs_user.c
>> +++ b/fs/hostfs/hostfs_user.c
>> @@ -36,6 +36,7 @@ static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p)
>>   	p->blocks = buf->st_blocks;
>>   	p->maj = os_major(buf->st_rdev);
>>   	p->min = os_minor(buf->st_rdev);
>> +	p->dev = buf->st_dev;
>>   }
>>   
>>   int stat_file(const char *path, struct hostfs_stat *p, int fd)
>> diff --git a/security/landlock/Kconfig b/security/landlock/Kconfig
>> index 8e33c4e8ffb8..c1e862a38410 100644
>> --- a/security/landlock/Kconfig
>> +++ b/security/landlock/Kconfig
>> @@ -2,7 +2,7 @@
>>   
>>   config SECURITY_LANDLOCK
>>   	bool "Landlock support"
>> -	depends on SECURITY && !ARCH_EPHEMERAL_INODES
>> +	depends on SECURITY
>>   	select SECURITY_PATH
>>   	help
>>   	  Landlock is a sandboxing mechanism that enables processes to restrict
>