[PATCH 00/25] fscrypt: add some higher-level helper functions

[PATCH 00/25] fscrypt: add some higher-level helper functions

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

This series reduces code duplication among ext4, f2fs, and ubifs by
introducing a S_ENCRYPTED inode flag (so we don't have to call back into
the filesystem to test the filesystem-specific inode flag), then
introducing new helper functions that are called at the beginning of the
open, link, rename, lookup, and setattr operations.

In the future we maybe should even call these new helpers from the VFS
so that each individual filesystem doesn't have to do it.  But that's
not possible currently because fs/crypto/ can be built as a module.

Making changes like this is a bit challenging due to interdependencies
between fscrypt and the individual filesystems, all of which have
different maintainers.  For now my intent is that patches 1-10 be taken
through the fscrypt tree --- though it's not perfect since patches 1-4
do make some changes to each filesystem, as everyone must set
S_ENCRYPTED before we can use it everywhere in the shared code.  But
afterwards, patches 11-25 can be picked up by the individual filesystems
to switch to the new helpers.

Eric Biggers (25):
  fs, fscrypt: add an S_ENCRYPTED inode flag
  fscrypt: switch from ->is_encrypted() to IS_ENCRYPTED()
  fscrypt: remove ->is_encrypted()
  fscrypt: remove unneeded empty fscrypt_operations structs
  fscrypt: new helper function - fscrypt_require_key()
  fscrypt: new helper function - fscrypt_file_open()
  fscrypt: new helper function - fscrypt_prepare_link()
  fscrypt: new helper function - fscrypt_prepare_rename()
  fscrypt: new helper function - fscrypt_prepare_lookup()
  fscrypt: new helper function - fscrypt_prepare_setattr()
  ext4: switch to fscrypt_file_open()
  ext4: switch to fscrypt_prepare_link()
  ext4: switch to fscrypt_prepare_rename()
  ext4: switch to fscrypt_prepare_lookup()
  ext4: switch to fscrypt_prepare_setattr()
  f2fs: switch to fscrypt_file_open()
  f2fs: switch to fscrypt_prepare_link()
  f2fs: switch to fscrypt_prepare_rename()
  f2fs: switch to fscrypt_prepare_lookup()
  f2fs: switch to fscrypt_prepare_setattr()
  ubifs: switch to fscrypt_file_open()
  ubifs: switch to fscrypt_prepare_link()
  ubifs: switch to fscrypt_prepare_rename()
  ubifs: switch to fscrypt_prepare_lookup()
  ubifs: switch to fscrypt_prepare_setattr()

 fs/crypto/Makefile              |   2 +-
 fs/crypto/crypto.c              |   2 +-
 fs/crypto/fname.c               |   3 +-
 fs/crypto/hooks.c               | 112 +++++++++++++++++++++++++++++
 fs/crypto/keyinfo.c             |   2 +-
 fs/crypto/policy.c              |   6 +-
 fs/ext4/file.c                  |  23 ++----
 fs/ext4/inode.c                 |  19 +++--
 fs/ext4/namei.c                 |  62 +++++-----------
 fs/ext4/super.c                 |  15 ++--
 fs/f2fs/f2fs.h                  |   1 +
 fs/f2fs/file.c                  |  30 ++------
 fs/f2fs/inode.c                 |   5 +-
 fs/f2fs/namei.c                 |  54 ++++----------
 fs/f2fs/super.c                 |   7 +-
 fs/ubifs/crypto.c               |   1 -
 fs/ubifs/dir.c                  |  43 ++++-------
 fs/ubifs/file.c                 |  41 ++---------
 fs/ubifs/ioctl.c                |   5 +-
 fs/ubifs/super.c                |   8 +--
 fs/ubifs/ubifs.h                |   9 +--
 fs/ubifs/xattr.c                |   1 +
 include/linux/fs.h              |   2 +
 include/linux/fscrypt_common.h  |   1 -
 include/linux/fscrypt_notsupp.h |  54 +++++++++++++-
 include/linux/fscrypt_supp.h    | 153 ++++++++++++++++++++++++++++++++++++++++
 26 files changed, 418 insertions(+), 243 deletions(-)
 create mode 100644 fs/crypto/hooks.c

-- 
2.14.1.821.g8fa685d3b7-goog

[PATCH 01/25] fs, fscrypt: add an S_ENCRYPTED inode flag

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Introduce a flag S_ENCRYPTED which can be set in ->i_flags to indicate
that the inode is encrypted using the fscrypt (fs/crypto/) mechanism.

Checking this flag will give the same information that
inode->i_sb->s_cop->is_encrypted(inode) currently does, but will be more
efficient.  This will be useful for adding higher-level helper functions
for filesystems to use.  For example we'll be able to replace this:

	if (ext4_encrypted_inode(inode)) {
		ret = fscrypt_get_encryption_info(inode);
		if (ret)
			return ret;
		if (!fscrypt_has_encryption_key(inode))
			return -ENOKEY;
	}

with this:

	ret = fscrypt_require_key(inode);
	if (ret)
		return ret;

... since we'll be able to retain the fast path for unencrypted files as
a single flag check, using an inline function.  This wasn't possible
before because we'd have had to frequently call through the
->i_sb->s_cop->is_encrypted function pointer, even when the encryption
support was disabled or not being used.

Note: we don't define S_ENCRYPTED to 0 if CONFIG_FS_ENCRYPTION is
disabled because we want to continue to return an error if an encrypted
file is accessed without encryption support, rather than pretending that
it is unencrypted.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/inode.c    | 7 +++++--
 fs/ext4/super.c    | 8 ++++++--
 fs/f2fs/f2fs.h     | 1 +
 fs/f2fs/inode.c    | 5 ++++-
 fs/ubifs/ioctl.c   | 5 ++++-
 fs/ubifs/xattr.c   | 1 +
 include/linux/fs.h | 2 ++
 7 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 31db875bc7a1..d5a471939fbc 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4589,10 +4589,13 @@ void ext4_set_inode_flags(struct inode *inode)
 		new_fl |= S_DIRSYNC;
 	if (test_opt(inode->i_sb, DAX) && S_ISREG(inode->i_mode) &&
 	    !ext4_should_journal_data(inode) && !ext4_has_inline_data(inode) &&
-	    !ext4_encrypted_inode(inode))
+	    !(flags & EXT4_ENCRYPT_FL))
 		new_fl |= S_DAX;
+	if (flags & EXT4_ENCRYPT_FL)
+		new_fl |= S_ENCRYPTED;
 	inode_set_flags(inode, new_fl,
-			S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX);
+			S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX|
+			S_ENCRYPTED);
 }
 
 static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b104096fce9e..dcfb19539871 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1181,7 +1181,8 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
 			ext4_clear_inode_state(inode,
 					EXT4_STATE_MAY_INLINE_DATA);
 			/*
-			 * Update inode->i_flags - e.g. S_DAX may get disabled
+			 * Update inode->i_flags - S_ENCRYPTED will be enabled,
+			 * S_DAX may be disabled
 			 */
 			ext4_set_inode_flags(inode);
 		}
@@ -1206,7 +1207,10 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
 				    ctx, len, 0);
 	if (!res) {
 		ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
-		/* Update inode->i_flags - e.g. S_DAX may get disabled */
+		/*
+		 * Update inode->i_flags - S_ENCRYPTED will be enabled,
+		 * S_DAX may be disabled
+		 */
 		ext4_set_inode_flags(inode);
 		res = ext4_mark_inode_dirty(handle, inode);
 		if (res)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9a7c90386947..beaefddf2ff8 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2949,6 +2949,7 @@ static inline void f2fs_set_encrypted_inode(struct inode *inode)
 {
 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 	file_set_encrypt(inode);
+	inode->i_flags |= S_ENCRYPTED;
 #endif
 }
 
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 50c88e37ed66..53fb08810ee9 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -43,8 +43,11 @@ void f2fs_set_inode_flags(struct inode *inode)
 		new_fl |= S_NOATIME;
 	if (flags & FS_DIRSYNC_FL)
 		new_fl |= S_DIRSYNC;
+	if (f2fs_encrypted_inode(inode))
+		new_fl |= S_ENCRYPTED;
 	inode_set_flags(inode, new_fl,
-			S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
+			S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|
+			S_ENCRYPTED);
 }
 
 static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c
index fdc311246807..0164bcc827f8 100644
--- a/fs/ubifs/ioctl.c
+++ b/fs/ubifs/ioctl.c
@@ -38,7 +38,8 @@ void ubifs_set_inode_flags(struct inode *inode)
 {
 	unsigned int flags = ubifs_inode(inode)->flags;
 
-	inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC);
+	inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC |
+			    S_ENCRYPTED);
 	if (flags & UBIFS_SYNC_FL)
 		inode->i_flags |= S_SYNC;
 	if (flags & UBIFS_APPEND_FL)
@@ -47,6 +48,8 @@ void ubifs_set_inode_flags(struct inode *inode)
 		inode->i_flags |= S_IMMUTABLE;
 	if (flags & UBIFS_DIRSYNC_FL)
 		inode->i_flags |= S_DIRSYNC;
+	if (flags & UBIFS_CRYPT_FL)
+		inode->i_flags |= S_ENCRYPTED;
 }
 
 /*
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index c13eae819cbc..5ddc89d564fd 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -170,6 +170,7 @@ static int create_xattr(struct ubifs_info *c, struct inode *host,
 	err = ubifs_jnl_update(c, host, nm, inode, 0, 1);
 	if (err)
 		goto out_cancel;
+	ubifs_set_inode_flags(host);
 	mutex_unlock(&host_ui->ui_mutex);
 
 	ubifs_release_budget(c, &req);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 339e73742e73..055d2fbf8eca 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1853,6 +1853,7 @@ struct super_operations {
 #else
 #define S_DAX		0	/* Make all the DAX code disappear */
 #endif
+#define S_ENCRYPTED	16384	/* Encrypted file (using fs/crypto/) */
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system
@@ -1892,6 +1893,7 @@ static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags
 #define IS_AUTOMOUNT(inode)	((inode)->i_flags & S_AUTOMOUNT)
 #define IS_NOSEC(inode)		((inode)->i_flags & S_NOSEC)
 #define IS_DAX(inode)		((inode)->i_flags & S_DAX)
+#define IS_ENCRYPTED(inode)	((inode)->i_flags & S_ENCRYPTED)
 
 #define IS_WHITEOUT(inode)	(S_ISCHR(inode->i_mode) && \
 				 (inode)->i_rdev == WHITEOUT_DEV)
-- 
2.14.1.821.g8fa685d3b7-goog

[PATCH 02/25] fscrypt: switch from ->is_encrypted() to IS_ENCRYPTED()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

IS_ENCRYPTED() now gives the same information as
i_sb->s_cop->is_encrypted() but is more efficient, since IS_ENCRYPTED()
is just a simple flag check.  Prepare to remove ->is_encrypted() by
switching all callers to IS_ENCRYPTED().

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/crypto/crypto.c              | 2 +-
 fs/crypto/fname.c               | 3 +--
 fs/crypto/keyinfo.c             | 2 +-
 fs/crypto/policy.c              | 6 +++---
 include/linux/fscrypt_notsupp.h | 2 +-
 5 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index c7835df7e7b8..608f6bbe0f31 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -340,7 +340,7 @@ static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags)
 		return -ECHILD;
 
 	dir = dget_parent(dentry);
-	if (!d_inode(dir)->i_sb->s_cop->is_encrypted(d_inode(dir))) {
+	if (!IS_ENCRYPTED(d_inode(dir))) {
 		dput(dir);
 		return 0;
 	}
diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
index ad9f814fdead..2878289b3ed2 100644
--- a/fs/crypto/fname.c
+++ b/fs/crypto/fname.c
@@ -382,8 +382,7 @@ int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname,
 	memset(fname, 0, sizeof(struct fscrypt_name));
 	fname->usr_fname = iname;
 
-	if (!dir->i_sb->s_cop->is_encrypted(dir) ||
-				fscrypt_is_dot_dotdot(iname)) {
+	if (!IS_ENCRYPTED(dir) || fscrypt_is_dot_dotdot(iname)) {
 		fname->disk_name.name = (unsigned char *)iname->name;
 		fname->disk_name.len = iname->len;
 		return 0;
diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
index 018c588c7ac3..236a68d4ea72 100644
--- a/fs/crypto/keyinfo.c
+++ b/fs/crypto/keyinfo.c
@@ -268,7 +268,7 @@ int fscrypt_get_encryption_info(struct inode *inode)
 	res = inode->i_sb->s_cop->get_context(inode, &ctx, sizeof(ctx));
 	if (res < 0) {
 		if (!fscrypt_dummy_context_enabled(inode) ||
-		    inode->i_sb->s_cop->is_encrypted(inode))
+		    IS_ENCRYPTED(inode))
 			return res;
 		/* Fake up a context for an unencrypted directory */
 		memset(&ctx, 0, sizeof(ctx));
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c
index ce07a86200f3..6a63b8a0d46c 100644
--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -109,7 +109,7 @@ int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg)
 	struct fscrypt_policy policy;
 	int res;
 
-	if (!inode->i_sb->s_cop->is_encrypted(inode))
+	if (!IS_ENCRYPTED(inode))
 		return -ENODATA;
 
 	res = inode->i_sb->s_cop->get_context(inode, &ctx, sizeof(ctx));
@@ -166,11 +166,11 @@ int fscrypt_has_permitted_context(struct inode *parent, struct inode *child)
 		return 1;
 
 	/* No restrictions if the parent directory is unencrypted */
-	if (!cops->is_encrypted(parent))
+	if (!IS_ENCRYPTED(parent))
 		return 1;
 
 	/* Encrypted directories must not contain unencrypted files */
-	if (!cops->is_encrypted(child))
+	if (!IS_ENCRYPTED(child))
 		return 0;
 
 	/*
diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index ec406aed2f2f..3f1325ec4646 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -97,7 +97,7 @@ static inline int fscrypt_setup_filename(struct inode *dir,
 					 const struct qstr *iname,
 					 int lookup, struct fscrypt_name *fname)
 {
-	if (dir->i_sb->s_cop->is_encrypted(dir))
+	if (IS_ENCRYPTED(dir))
 		return -EOPNOTSUPP;
 
 	memset(fname, 0, sizeof(struct fscrypt_name));
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 03/25] fscrypt: remove ->is_encrypted()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Now that all callers of fscrypt_operations.is_encrypted() have been
switched to IS_ENCRYPTED(), remove ->is_encrypted().

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/super.c                | 2 --
 fs/f2fs/super.c                | 2 --
 fs/ubifs/crypto.c              | 1 -
 fs/ubifs/super.c               | 1 -
 fs/ubifs/ubifs.h               | 9 ++-------
 include/linux/fscrypt_common.h | 1 -
 6 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index dcfb19539871..bc63cdf194e3 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1241,13 +1241,11 @@ static const struct fscrypt_operations ext4_cryptops = {
 	.get_context		= ext4_get_context,
 	.set_context		= ext4_set_context,
 	.dummy_context		= ext4_dummy_context,
-	.is_encrypted		= ext4_encrypted_inode,
 	.empty_dir		= ext4_empty_dir,
 	.max_namelen		= ext4_max_namelen,
 };
 #else
 static const struct fscrypt_operations ext4_cryptops = {
-	.is_encrypted		= ext4_encrypted_inode,
 };
 #endif
 
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 89f61eb3d167..1cb41f711ab8 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1594,13 +1594,11 @@ static const struct fscrypt_operations f2fs_cryptops = {
 	.key_prefix	= "f2fs:",
 	.get_context	= f2fs_get_context,
 	.set_context	= f2fs_set_context,
-	.is_encrypted	= f2fs_encrypted_inode,
 	.empty_dir	= f2fs_empty_dir,
 	.max_namelen	= f2fs_max_namelen,
 };
 #else
 static const struct fscrypt_operations f2fs_cryptops = {
-	.is_encrypted	= f2fs_encrypted_inode,
 };
 #endif
 
diff --git a/fs/ubifs/crypto.c b/fs/ubifs/crypto.c
index 114ba455bac3..8880fa7733d8 100644
--- a/fs/ubifs/crypto.c
+++ b/fs/ubifs/crypto.c
@@ -87,7 +87,6 @@ const struct fscrypt_operations ubifs_crypt_operations = {
 	.key_prefix		= "ubifs:",
 	.get_context		= ubifs_crypt_get_context,
 	.set_context		= ubifs_crypt_set_context,
-	.is_encrypted		= __ubifs_crypt_is_encrypted,
 	.empty_dir		= ubifs_crypt_empty_dir,
 	.max_namelen		= ubifs_crypt_max_namelen,
 };
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 5496b17b959c..adaca6088836 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2009,7 +2009,6 @@ static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
 
 #ifndef CONFIG_UBIFS_FS_ENCRYPTION
 const struct fscrypt_operations ubifs_crypt_operations = {
-	.is_encrypted		= __ubifs_crypt_is_encrypted,
 };
 #endif
 
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index cd43651f1731..7b17b70cbf33 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1835,18 +1835,13 @@ int ubifs_decrypt(const struct inode *inode, struct ubifs_data_node *dn,
 
 extern const struct fscrypt_operations ubifs_crypt_operations;
 
-static inline bool __ubifs_crypt_is_encrypted(struct inode *inode)
+static inline bool ubifs_crypt_is_encrypted(const struct inode *inode)
 {
-	struct ubifs_inode *ui = ubifs_inode(inode);
+	const struct ubifs_inode *ui = ubifs_inode(inode);
 
 	return ui->flags & UBIFS_CRYPT_FL;
 }
 
-static inline bool ubifs_crypt_is_encrypted(const struct inode *inode)
-{
-	return __ubifs_crypt_is_encrypted((struct inode *)inode);
-}

[PATCH 04/25] fscrypt: remove unneeded empty fscrypt_operations structs

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

In the case where a filesystem has been configured without encryption
support, there is no longer any need to initialize ->s_cop at all, since
none of the methods are ever called.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/super.c  | 5 ++---
 fs/f2fs/super.c  | 5 ++---
 fs/ubifs/super.c | 7 ++-----
 3 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index bc63cdf194e3..04f3670748e7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1244,9 +1244,6 @@ static const struct fscrypt_operations ext4_cryptops = {
 	.empty_dir		= ext4_empty_dir,
 	.max_namelen		= ext4_max_namelen,
 };
-#else
-static const struct fscrypt_operations ext4_cryptops = {
-};
 #endif
 
 #ifdef CONFIG_QUOTA
@@ -3998,7 +3995,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_op = &ext4_sops;
 	sb->s_export_op = &ext4_export_ops;
 	sb->s_xattr = ext4_xattr_handlers;
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
 	sb->s_cop = &ext4_cryptops;
+#endif
 #ifdef CONFIG_QUOTA
 	sb->dq_op = &ext4_quota_operations;
 	if (ext4_has_feature_quota(sb))
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 1cb41f711ab8..c1c7183b3527 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1597,9 +1597,6 @@ static const struct fscrypt_operations f2fs_cryptops = {
 	.empty_dir	= f2fs_empty_dir,
 	.max_namelen	= f2fs_max_namelen,
 };
-#else
-static const struct fscrypt_operations f2fs_cryptops = {
-};
 #endif
 
 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
@@ -2318,7 +2315,9 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 #endif
 
 	sb->s_op = &f2fs_sops;
+#ifdef CONFIG_F2FS_FS_ENCRYPTION
 	sb->s_cop = &f2fs_cryptops;
+#endif
 	sb->s_xattr = f2fs_xattr_handlers;
 	sb->s_export_op = &f2fs_export_ops;
 	sb->s_magic = F2FS_SUPER_MAGIC;
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index adaca6088836..7503e7cdf870 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2007,11 +2007,6 @@ static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
 	return c;
 }
 
-#ifndef CONFIG_UBIFS_FS_ENCRYPTION
-const struct fscrypt_operations ubifs_crypt_operations = {
-};
-#endif
-
 static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct ubifs_info *c = sb->s_fs_info;
@@ -2054,7 +2049,9 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
 		sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
 	sb->s_op = &ubifs_super_operations;
 	sb->s_xattr = ubifs_xattr_handlers;
+#ifdef CONFIG_UBIFS_FS_ENCRYPTION
 	sb->s_cop = &ubifs_crypt_operations;
+#endif
 
 	mutex_lock(&c->umount_mutex);
 	err = mount_ubifs(c);
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 05/25] fscrypt: new helper function - fscrypt_require_key()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Add a helper function which checks if an inode is encrypted, and if so,
tries to set up its encryption key.  This is a pattern which is
duplicated in multiple places in each of ext4, f2fs, and ubifs --- for
example, when a regular file is asked to be opened or truncated.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 include/linux/fscrypt_notsupp.h |  8 ++++++++
 include/linux/fscrypt_supp.h    | 28 ++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index 3f1325ec4646..3cfc953fef71 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -174,4 +174,12 @@ static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
 	return -EOPNOTSUPP;
 }
 
+/* hooks.c */
+static inline int fscrypt_require_key(struct inode *inode)
+{
+	if (IS_ENCRYPTED(inode))
+		return -EOPNOTSUPP;
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_NOTSUPP_H */
diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
index 32e2fcf13b01..b6d4b5d303a3 100644
--- a/include/linux/fscrypt_supp.h
+++ b/include/linux/fscrypt_supp.h
@@ -142,4 +142,32 @@ extern void fscrypt_pullback_bio_page(struct page **, bool);
 extern int fscrypt_zeroout_range(const struct inode *, pgoff_t, sector_t,
 				 unsigned int);
 
+/* hooks.c */
+
+/**
+ * fscrypt_require_key - require an inode's encryption key
+ * @inode: the inode we need the key for
+ *
+ * If the inode is encrypted, set up its encryption key if not already done.
+ * Then require that the key be present and return -ENOKEY otherwise.
+ *
+ * No locks are needed, and currently the key will live as long as the struct
+ * inode --- so it won't go away from under you.
+ *
+ * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code
+ * if a problem occurred while setting up the encryption key.
+ */
+static inline int fscrypt_require_key(struct inode *inode)
+{
+	if (IS_ENCRYPTED(inode)) {
+		int err = fscrypt_get_encryption_info(inode);
+
+		if (err)
+			return err;
+		if (!fscrypt_has_encryption_key(inode))
+			return -ENOKEY;
+	}
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_SUPP_H */
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 06/25] fscrypt: new helper function - fscrypt_file_open()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Add a helper function which prepares to open a regular file which may be
encrypted.  It handles setting up the file's encryption key, then
checking that the file's encryption policy matches that of its parent
directory (if the parent directory is encrypted).  It may be set as the
->open() method or it can be called from another ->open() method.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/crypto/Makefile              |  2 +-
 fs/crypto/hooks.c               | 49 +++++++++++++++++++++++++++++++++++++++++
 include/linux/fscrypt_notsupp.h |  7 ++++++
 include/linux/fscrypt_supp.h    |  2 ++
 4 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 fs/crypto/hooks.c

diff --git a/fs/crypto/Makefile b/fs/crypto/Makefile
index 9f6607f17b53..cb496989a6b6 100644
--- a/fs/crypto/Makefile
+++ b/fs/crypto/Makefile
@@ -1,4 +1,4 @@
 obj-$(CONFIG_FS_ENCRYPTION)	+= fscrypto.o
 
-fscrypto-y := crypto.o fname.o policy.o keyinfo.o
+fscrypto-y := crypto.o fname.o hooks.o keyinfo.o policy.o
 fscrypto-$(CONFIG_BLOCK) += bio.o
diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c
new file mode 100644
index 000000000000..069088e91ea9
--- /dev/null
+++ b/fs/crypto/hooks.c
@@ -0,0 +1,49 @@
+/*
+ * fs/crypto/hooks.c
+ *
+ * Encryption hooks for higher-level filesystem operations.
+ */
+
+#include <linux/ratelimit.h>
+#include "fscrypt_private.h"
+
+/**
+ * fscrypt_file_open - prepare to open a possibly-encrypted regular file
+ * @inode: the inode being opened
+ * @filp: the struct file being set up
+ *
+ * Currently, an encrypted regular file can only be opened if its encryption key
+ * is available; access to the raw encrypted contents is not supported.
+ * Therefore, we first set up the inode's encryption key (if not already done)
+ * and return an error if it's unavailable.
+ *
+ * We also verify that if the parent directory (from the path via which the file
+ * is being opened) is encrypted, then the inode being opened uses the same
+ * encryption policy.  This is needed as part of the enforcement that all files
+ * in an encrypted directory tree use the same encryption policy, as a
+ * protection against certain types of offline attacks.  Note that this check is
+ * needed even when opening an *unencrypted* file, since it's forbidden to have
+ * an unencrypted file in an encrypted directory.
+ *
+ * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code
+ */
+int fscrypt_file_open(struct inode *inode, struct file *filp)
+{
+	int err;
+	struct dentry *dir;
+
+	err = fscrypt_require_key(inode);
+	if (err)
+		return err;
+
+	dir = dget_parent(file_dentry(filp));
+	if (IS_ENCRYPTED(d_inode(dir)) &&
+	    !fscrypt_has_permitted_context(d_inode(dir), inode)) {
+		pr_warn_ratelimited("fscrypt: inconsistent encryption contexts: %lu/%lu",
+				    d_inode(dir)->i_ino, inode->i_ino);
+		err = -EPERM;
+	}
+	dput(dir);
+	return err;
+}
+EXPORT_SYMBOL_GPL(fscrypt_file_open);
diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index 3cfc953fef71..99e8ee6f2ce4 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -182,4 +182,11 @@ static inline int fscrypt_require_key(struct inode *inode)
 	return 0;
 }
 
+static inline int fscrypt_file_open(struct inode *inode, struct file *filp)
+{
+	if (IS_ENCRYPTED(inode))
+		return -EOPNOTSUPP;
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_NOTSUPP_H */
diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
index b6d4b5d303a3..521f15adf83c 100644
--- a/include/linux/fscrypt_supp.h
+++ b/include/linux/fscrypt_supp.h
@@ -170,4 +170,6 @@ static inline int fscrypt_require_key(struct inode *inode)
 	return 0;
 }
 
+extern int fscrypt_file_open(struct inode *inode, struct file *filp);
+
 #endif	/* _LINUX_FSCRYPT_SUPP_H */
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 07/25] fscrypt: new helper function - fscrypt_prepare_link()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Introduce a helper function which prepares to link an inode into a
possibly-encrypted directory.  It handles setting up the target
directory's encryption key, then verifying that the link won't violate
the constraint that all files in an encrypted directory tree use the
same encryption policy.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/crypto/hooks.c               | 15 +++++++++++++++
 include/linux/fscrypt_notsupp.h |  9 +++++++++
 include/linux/fscrypt_supp.h    | 29 +++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)

diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c
index 069088e91ea9..8b90217320dd 100644
--- a/fs/crypto/hooks.c
+++ b/fs/crypto/hooks.c
@@ -47,3 +47,18 @@ int fscrypt_file_open(struct inode *inode, struct file *filp)
 	return err;
 }
 EXPORT_SYMBOL_GPL(fscrypt_file_open);
+
+int __fscrypt_prepare_link(struct inode *inode, struct inode *dir)
+{
+	int err;
+
+	err = fscrypt_require_key(dir);
+	if (err)
+		return err;
+
+	if (!fscrypt_has_permitted_context(dir, inode))
+		return -EPERM;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__fscrypt_prepare_link);
diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index 99e8ee6f2ce4..2cb400440be3 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -189,4 +189,13 @@ static inline int fscrypt_file_open(struct inode *inode, struct file *filp)
 	return 0;
 }
 
+static inline int fscrypt_prepare_link(struct dentry *old_dentry,
+				       struct inode *dir,
+				       struct dentry *dentry)
+{
+	if (IS_ENCRYPTED(dir))
+		return -EOPNOTSUPP;
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_NOTSUPP_H */
diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
index 521f15adf83c..ebc0cc41aaf9 100644
--- a/include/linux/fscrypt_supp.h
+++ b/include/linux/fscrypt_supp.h
@@ -172,4 +172,33 @@ static inline int fscrypt_require_key(struct inode *inode)
 
 extern int fscrypt_file_open(struct inode *inode, struct file *filp);
 
+extern int __fscrypt_prepare_link(struct inode *inode, struct inode *dir);
+
+/**
+ * fscrypt_prepare_link - prepare to link an inode into a possibly-encrypted directory
+ * @old_dentry: an existing dentry for the inode being linked
+ * @dir: the target directory
+ * @dentry: negative dentry for the target filename
+ *
+ * A new link can only be added to an encrypted directory if the directory's
+ * encryption key is available --- since otherwise we'd have no way to encrypt
+ * the filename.  Therefore, we first set up the directory's encryption key (if
+ * not already done) and return an error if it's unavailable.
+ *
+ * We also verify that the link will not violate the constraint that all files
+ * in an encrypted directory tree use the same encryption policy.
+ *
+ * Return: 0 on success, -ENOKEY if the directory's encryption key is missing,
+ * -EPERM if the link would result in an inconsistent encryption policy, or
+ * another -errno code.
+ */
+static inline int fscrypt_prepare_link(struct dentry *old_dentry,
+				       struct inode *dir,
+				       struct dentry *dentry)
+{
+	if (IS_ENCRYPTED(dir))
+		return __fscrypt_prepare_link(d_inode(old_dentry), dir);
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_SUPP_H */
-- 
2.14.1.821.g8fa685d3b7-goog

[PATCH 08/25] fscrypt: new helper function - fscrypt_prepare_rename()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Introduce a helper function which prepares to rename a file into a
possibly encrypted directory.  It handles loading the encryption keys
for the source and target directories if needed, and it handles
enforcing that if the target directory (and the source directory for a
cross-rename) is encrypted, then the file being moved into the directory
has the same encryption policy as its containing directory.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/crypto/hooks.c               | 30 ++++++++++++++++++++++++++++++
 include/linux/fscrypt_notsupp.h | 11 +++++++++++
 include/linux/fscrypt_supp.h    | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 80 insertions(+)

diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c
index 8b90217320dd..822cb78f9b45 100644
--- a/fs/crypto/hooks.c
+++ b/fs/crypto/hooks.c
@@ -62,3 +62,33 @@ int __fscrypt_prepare_link(struct inode *inode, struct inode *dir)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(__fscrypt_prepare_link);
+
+int __fscrypt_prepare_rename(struct inode *old_dir, struct dentry *old_dentry,
+			     struct inode *new_dir, struct dentry *new_dentry,
+			     unsigned int flags)
+{
+	int err;
+
+	err = fscrypt_require_key(old_dir);
+	if (err)
+		return err;
+
+	err = fscrypt_require_key(new_dir);
+	if (err)
+		return err;
+
+	if (old_dir != new_dir) {
+		if (IS_ENCRYPTED(new_dir) &&
+		    !fscrypt_has_permitted_context(new_dir,
+						   d_inode(old_dentry)))
+			return -EPERM;
+
+		if ((flags & RENAME_EXCHANGE) &&
+		    IS_ENCRYPTED(old_dir) &&
+		    !fscrypt_has_permitted_context(old_dir,
+						   d_inode(new_dentry)))
+			return -EPERM;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__fscrypt_prepare_rename);
diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index 2cb400440be3..a88a2959cd8c 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -198,4 +198,15 @@ static inline int fscrypt_prepare_link(struct dentry *old_dentry,
 	return 0;
 }
 
+static inline int fscrypt_prepare_rename(struct inode *old_dir,
+					 struct dentry *old_dentry,
+					 struct inode *new_dir,
+					 struct dentry *new_dentry,
+					 unsigned int flags)
+{
+	if (IS_ENCRYPTED(old_dir) || IS_ENCRYPTED(new_dir))
+		return -EOPNOTSUPP;
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_NOTSUPP_H */
diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
index ebc0cc41aaf9..fa062d41b39a 100644
--- a/include/linux/fscrypt_supp.h
+++ b/include/linux/fscrypt_supp.h
@@ -201,4 +201,43 @@ static inline int fscrypt_prepare_link(struct dentry *old_dentry,
 	return 0;
 }
 
+extern int __fscrypt_prepare_rename(struct inode *old_dir,
+				    struct dentry *old_dentry,
+				    struct inode *new_dir,
+				    struct dentry *new_dentry,
+				    unsigned int flags);
+
+/**
+ * fscrypt_prepare_rename - prepare for a rename between possibly-encrypted directories
+ * @old_dir: source directory
+ * @old_dentry: dentry for source file
+ * @new_dir: target directory
+ * @new_dentry: dentry for target location (may be negative unless exchanging)
+ * @flags: rename flags (we care at least about %RENAME_EXCHANGE)
+ *
+ * Prepare for ->rename() where the source and/or target directories may be
+ * encrypted.  A new link can only be added to an encrypted directory if the
+ * directory's encryption key is available --- since otherwise we'd have no way
+ * to encrypt the filename.  A rename to an existing name, on the other hand,
+ * *is* cryptographically possible without the key.  However, we take the more
+ * conservative approach and just forbid all no-key renames.
+ *
+ * We also verify that the rename will not violate the constraint that all files
+ * in an encrypted directory tree use the same encryption policy.
+ *
+ * Return: 0 on success, -ENOKEY if an encryption key is missing, -EPERM if the
+ * rename would cause inconsistent encryption policies, or another -errno code.
+ */
+static inline int fscrypt_prepare_rename(struct inode *old_dir,
+					 struct dentry *old_dentry,
+					 struct inode *new_dir,
+					 struct dentry *new_dentry,
+					 unsigned int flags)
+{
+	if (IS_ENCRYPTED(old_dir) || IS_ENCRYPTED(new_dir))
+		return __fscrypt_prepare_rename(old_dir, old_dentry,
+						new_dir, new_dentry, flags);
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_SUPP_H */
-- 
2.14.1.821.g8fa685d3b7-goog

[PATCH 09/25] fscrypt: new helper function - fscrypt_prepare_lookup()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Introduce a helper function which prepares to look up the given dentry
in the given directory.  If the directory is encrypted, it handles
loading the directory's encryption key, setting the dentry's ->d_op to
fscrypt_d_ops, and setting DCACHE_ENCRYPTED_WITH_KEY if the directory's
encryption key is available.

Note: once all filesystems switch over to this, we'll be able to move
fscrypt_d_ops and fscrypt_set_encrypted_dentry() to fscrypt_private.h.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/crypto/hooks.c               | 18 ++++++++++++++++++
 include/linux/fscrypt_notsupp.h |  9 +++++++++
 include/linux/fscrypt_supp.h    | 30 ++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+)

diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c
index 822cb78f9b45..9f5fb2eb9cf7 100644
--- a/fs/crypto/hooks.c
+++ b/fs/crypto/hooks.c
@@ -92,3 +92,21 @@ int __fscrypt_prepare_rename(struct inode *old_dir, struct dentry *old_dentry,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(__fscrypt_prepare_rename);
+
+int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry)
+{
+	int err = fscrypt_get_encryption_info(dir);
+
+	if (err)
+		return err;
+
+	if (fscrypt_has_encryption_key(dir)) {
+		spin_lock(&dentry->d_lock);
+		dentry->d_flags |= DCACHE_ENCRYPTED_WITH_KEY;
+		spin_unlock(&dentry->d_lock);
+	}
+
+	d_set_d_op(dentry, &fscrypt_d_ops);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__fscrypt_prepare_lookup);
diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index a88a2959cd8c..e9b437605f9c 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -209,4 +209,13 @@ static inline int fscrypt_prepare_rename(struct inode *old_dir,
 	return 0;
 }
 
+static inline int fscrypt_prepare_lookup(struct inode *dir,
+					 struct dentry *dentry,
+					 unsigned int flags)
+{
+	if (IS_ENCRYPTED(dir))
+		return -EOPNOTSUPP;
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_NOTSUPP_H */
diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
index fa062d41b39a..2b99bc01c59b 100644
--- a/include/linux/fscrypt_supp.h
+++ b/include/linux/fscrypt_supp.h
@@ -240,4 +240,34 @@ static inline int fscrypt_prepare_rename(struct inode *old_dir,
 	return 0;
 }
 
+extern int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry);
+
+/**
+ * fscrypt_prepare_lookup - prepare to lookup a name in a possibly-encrypted directory
+ * @dir: directory being searched
+ * @dentry: filename being looked up
+ * @flags: lookup flags
+ *
+ * Prepare for ->lookup() in a directory which may be encrypted.  Lookups can be
+ * done with or without the directory's encryption key; without the key,
+ * filenames are presented in encrypted form.  Therefore, we'll try to set up
+ * the directory's encryption key, but even without it the lookup can continue.
+ *
+ * To allow invalidating stale dentries if the directory's encryption key is
+ * added later, we also install a custom ->d_revalidate() method and use the
+ * DCACHE_ENCRYPTED_WITH_KEY flag to indicate whether a given dentry is a
+ * plaintext name (flag set) or a ciphertext name (flag cleared).
+ *
+ * Return: 0 on success, -errno if a problem occurred while setting up the
+ * encryption key
+ */
+static inline int fscrypt_prepare_lookup(struct inode *dir,
+					 struct dentry *dentry,
+					 unsigned int flags)
+{
+	if (IS_ENCRYPTED(dir))
+		return __fscrypt_prepare_lookup(dir, dentry);
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_SUPP_H */
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 10/25] fscrypt: new helper function - fscrypt_prepare_setattr()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Introduce a helper function for filesystems to call when processing
->setattr() on a possibly-encrypted inode.  It handles enforcing that an
encrypted file can only be truncated if its encryption key is available.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 include/linux/fscrypt_notsupp.h |  8 ++++++++
 include/linux/fscrypt_supp.h    | 25 +++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index e9b437605f9c..b0dd2d1756b2 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -218,4 +218,12 @@ static inline int fscrypt_prepare_lookup(struct inode *dir,
 	return 0;
 }
 
+static inline int fscrypt_prepare_setattr(struct dentry *dentry,
+					  struct iattr *attr)
+{
+	if (IS_ENCRYPTED(d_inode(dentry)) && (attr->ia_valid & ATTR_SIZE))
+		return -EOPNOTSUPP;
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_NOTSUPP_H */
diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
index 2b99bc01c59b..bdd01e02435b 100644
--- a/include/linux/fscrypt_supp.h
+++ b/include/linux/fscrypt_supp.h
@@ -270,4 +270,29 @@ static inline int fscrypt_prepare_lookup(struct inode *dir,
 	return 0;
 }
 
+/**
+ * fscrypt_prepare_setattr - prepare to change a possibly-encrypted inode's attributes
+ * @dentry: dentry through which the inode is being changed
+ * @attr: attributes to change
+ *
+ * Prepare for ->setattr() on a possibly-encrypted inode.  On an encrypted file,
+ * most attribute changes are allowed even without the encryption key.  However,
+ * without the encryption key we do have to forbid truncates.  This is needed
+ * because the size being truncated to may not be a multiple of the filesystem
+ * block size, and in that case we'd have to decrypt the final block, zero the
+ * portion past i_size, and re-encrypt it.  (We *could* allow truncating to a
+ * filesystem block boundary, but it's simpler to just forbid all truncates ---
+ * and we already forbid all other contents modifications without the key.)
+ *
+ * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code
+ * if a problem occurred while setting up the encryption key.
+ */
+static inline int fscrypt_prepare_setattr(struct dentry *dentry,
+					  struct iattr *attr)
+{
+	if (IS_ENCRYPTED(d_inode(dentry)) && (attr->ia_valid & ATTR_SIZE))
+		return fscrypt_require_key(d_inode(dentry));
+	return 0;
+}
+
 #endif	/* _LINUX_FSCRYPT_SUPP_H */
-- 
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[PATCH 11/25] ext4: switch to fscrypt_file_open()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/file.c | 23 ++++-------------------
 1 file changed, 4 insertions(+), 19 deletions(-)

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b1da660ac3bc..ffe9144088f8 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -364,7 +364,6 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
 	struct super_block *sb = inode->i_sb;
 	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 	struct vfsmount *mnt = filp->f_path.mnt;
-	struct dentry *dir;
 	struct path path;
 	char buf[64], *cp;
 	int ret;
@@ -404,25 +403,11 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
 			ext4_journal_stop(handle);
 		}
 	}
-	if (ext4_encrypted_inode(inode)) {
-		ret = fscrypt_get_encryption_info(inode);
-		if (ret)
-			return -EACCES;
-		if (!fscrypt_has_encryption_key(inode))
-			return -ENOKEY;
-	}
 
-	dir = dget_parent(file_dentry(filp));
-	if (ext4_encrypted_inode(d_inode(dir)) &&
-			!fscrypt_has_permitted_context(d_inode(dir), inode)) {
-		ext4_warning(inode->i_sb,
-			     "Inconsistent encryption contexts: %lu/%lu",
-			     (unsigned long) d_inode(dir)->i_ino,
-			     (unsigned long) inode->i_ino);
-		dput(dir);
-		return -EPERM;
-	}
-	dput(dir);
+	ret = fscrypt_file_open(inode, filp);
+	if (ret)
+		return ret;
+
 	/*
 	 * Set up the jbd2_inode if we are opening the inode for
 	 * writing and the journal is present
-- 
2.14.1.821.g8fa685d3b7-goog


------------------------------------------------------------------------------
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[PATCH 12/25] ext4: switch to fscrypt_prepare_link()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/namei.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index c1cf020d1889..b2058500f1dc 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3221,9 +3221,10 @@ static int ext4_link(struct dentry *old_dentry,
 
 	if (inode->i_nlink >= EXT4_LINK_MAX)
 		return -EMLINK;
-	if (ext4_encrypted_inode(dir) &&
-			!fscrypt_has_permitted_context(dir, inode))
-		return -EPERM;
+
+	err = fscrypt_prepare_link(old_dentry, dir, dentry);
+	if (err)
+		return err;
 
        if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
 	   (!projid_eq(EXT4_I(dir)->i_projid,
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 13/25] ext4: switch to fscrypt_prepare_rename()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/namei.c | 33 +++++++--------------------------
 1 file changed, 7 insertions(+), 26 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index b2058500f1dc..b2fbc2b87bcf 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3516,12 +3516,6 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 			EXT4_I(old_dentry->d_inode)->i_projid)))
 		return -EXDEV;
 
-	if ((ext4_encrypted_inode(old_dir) &&
-	     !fscrypt_has_encryption_key(old_dir)) ||
-	    (ext4_encrypted_inode(new_dir) &&
-	     !fscrypt_has_encryption_key(new_dir)))
-		return -ENOKEY;
-
 	retval = dquot_initialize(old.dir);
 	if (retval)
 		return retval;
@@ -3550,13 +3544,6 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
 		goto end_rename;
 
-	if ((old.dir != new.dir) &&
-	    ext4_encrypted_inode(new.dir) &&
-	    !fscrypt_has_permitted_context(new.dir, old.inode)) {
-		retval = -EPERM;
-		goto end_rename;
-	}
-
 	new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
 				 &new.de, &new.inlined);
 	if (IS_ERR(new.bh)) {
@@ -3722,19 +3709,6 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 	int retval;
 	struct timespec ctime;
 
-	if ((ext4_encrypted_inode(old_dir) &&
-	     !fscrypt_has_encryption_key(old_dir)) ||
-	    (ext4_encrypted_inode(new_dir) &&
-	     !fscrypt_has_encryption_key(new_dir)))
-		return -ENOKEY;
-
-	if ((ext4_encrypted_inode(old_dir) ||
-	     ext4_encrypted_inode(new_dir)) &&
-	    (old_dir != new_dir) &&
-	    (!fscrypt_has_permitted_context(new_dir, old.inode) ||
-	     !fscrypt_has_permitted_context(old_dir, new.inode)))
-		return -EPERM;
-
 	if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
 	     !projid_eq(EXT4_I(new_dir)->i_projid,
 			EXT4_I(old_dentry->d_inode)->i_projid)) ||
@@ -3861,12 +3835,19 @@ static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
+	int err;
+
 	if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb))))
 		return -EIO;
 
 	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 		return -EINVAL;
 
+	err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
+				     flags);
+	if (err)
+		return err;
+
 	if (flags & RENAME_EXCHANGE) {
 		return ext4_cross_rename(old_dir, old_dentry,
 					 new_dir, new_dentry);
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 14/25] ext4: switch to fscrypt_prepare_lookup()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/namei.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index b2fbc2b87bcf..a6b6f09e0a88 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1538,24 +1538,14 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
 	struct inode *inode;
 	struct ext4_dir_entry_2 *de;
 	struct buffer_head *bh;
+	int err;
 
-	if (ext4_encrypted_inode(dir)) {
-		int res = fscrypt_get_encryption_info(dir);
-
-		/*
-		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
-		 * created while the directory was encrypted and we
-		 * have access to the key.
-		 */
-		if (fscrypt_has_encryption_key(dir))
-			fscrypt_set_encrypted_dentry(dentry);
-		fscrypt_set_d_op(dentry);
-		if (res && res != -ENOKEY)
-			return ERR_PTR(res);
-	}
+	err = fscrypt_prepare_lookup(dir, dentry, flags);
+	if (err)
+		return ERR_PTR(err);
 
-       if (dentry->d_name.len > EXT4_NAME_LEN)
-	       return ERR_PTR(-ENAMETOOLONG);
+	if (dentry->d_name.len > EXT4_NAME_LEN)
+		return ERR_PTR(-ENAMETOOLONG);
 
 	bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
 	if (IS_ERR(bh))
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 15/25] ext4: switch to fscrypt_prepare_setattr()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ext4/inode.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d5a471939fbc..617c7feced24 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5311,6 +5311,10 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 	if (error)
 		return error;
 
+	error = fscrypt_prepare_setattr(dentry, attr);
+	if (error)
+		return error;
+
 	if (is_quota_modification(inode, attr)) {
 		error = dquot_initialize(inode);
 		if (error)
@@ -5356,14 +5360,6 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 		loff_t oldsize = inode->i_size;
 		int shrink = (attr->ia_size <= inode->i_size);
 
-		if (ext4_encrypted_inode(inode)) {
-			error = fscrypt_get_encryption_info(inode);
-			if (error)
-				return error;
-			if (!fscrypt_has_encryption_key(inode))
-				return -ENOKEY;
-		}
-
 		if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
 			struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 16/25] f2fs: switch to fscrypt_file_open()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/f2fs/file.c | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 517e112c8a9a..8cef3931a00b 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -455,22 +455,10 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 
 static int f2fs_file_open(struct inode *inode, struct file *filp)
 {
-	struct dentry *dir;
+	int err = fscrypt_file_open(inode, filp);
 
-	if (f2fs_encrypted_inode(inode)) {
-		int ret = fscrypt_get_encryption_info(inode);
-		if (ret)
-			return -EACCES;
-		if (!fscrypt_has_encryption_key(inode))
-			return -ENOKEY;
-	}
-	dir = dget_parent(file_dentry(filp));
-	if (f2fs_encrypted_inode(d_inode(dir)) &&
-			!fscrypt_has_permitted_context(d_inode(dir), inode)) {
-		dput(dir);
-		return -EPERM;
-	}
-	dput(dir);
+	if (err)
+		return err;
 	return dquot_file_open(inode, filp);
 }
 
-- 
2.14.1.821.g8fa685d3b7-goog

[PATCH 17/25] f2fs: switch to fscrypt_prepare_link()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/f2fs/namei.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index a4dab98c4b7b..cf4e4294e450 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -221,9 +221,9 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	int err;
 
-	if (f2fs_encrypted_inode(dir) &&
-			!fscrypt_has_permitted_context(dir, inode))
-		return -EPERM;
+	err = fscrypt_prepare_link(old_dentry, dir, dentry);
+	if (err)
+		return err;
 
 	if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 			(!projid_eq(F2FS_I(dir)->i_projid,
-- 
2.14.1.821.g8fa685d3b7-goog


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[PATCH 18/25] f2fs: switch to fscrypt_prepare_rename()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/f2fs/namei.c | 31 +++++++------------------------
 1 file changed, 7 insertions(+), 24 deletions(-)

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index cf4e4294e450..80bcf2185fd8 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -742,18 +742,6 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 	int err = -ENOENT;
 
-	if ((f2fs_encrypted_inode(old_dir) &&
-			!fscrypt_has_encryption_key(old_dir)) ||
-			(f2fs_encrypted_inode(new_dir) &&
-			!fscrypt_has_encryption_key(new_dir)))
-		return -ENOKEY;
-
-	if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
-			!fscrypt_has_permitted_context(new_dir, old_inode)) {
-		err = -EPERM;
-		goto out;
-	}
-
 	if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 			(!projid_eq(F2FS_I(new_dir)->i_projid,
 			F2FS_I(old_dentry->d_inode)->i_projid)))
@@ -935,18 +923,6 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 	int old_nlink = 0, new_nlink = 0;
 	int err = -ENOENT;
 
-	if ((f2fs_encrypted_inode(old_dir) &&
-			!fscrypt_has_encryption_key(old_dir)) ||
-			(f2fs_encrypted_inode(new_dir) &&
-			!fscrypt_has_encryption_key(new_dir)))
-		return -ENOKEY;
-
-	if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
-			(old_dir != new_dir) &&
-			(!fscrypt_has_permitted_context(new_dir, old_inode) ||
-			 !fscrypt_has_permitted_context(old_dir, new_inode)))
-		return -EPERM;
-
 	if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 			!projid_eq(F2FS_I(new_dir)->i_projid,
 			F2FS_I(old_dentry->d_inode)->i_projid)) ||
@@ -1086,9 +1062,16 @@ static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
+	int err;
+
 	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 		return -EINVAL;
 
+	err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
+				     flags);
+	if (err)
+		return err;
+
 	if (flags & RENAME_EXCHANGE) {
 		return f2fs_cross_rename(old_dir, old_dentry,
 					 new_dir, new_dentry);
-- 
2.14.1.821.g8fa685d3b7-goog

[PATCH 19/25] f2fs: switch to fscrypt_prepare_lookup()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/f2fs/namei.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 80bcf2185fd8..f4b99f1468d8 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -335,20 +335,9 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 	int err = 0;
 	unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 
-	if (f2fs_encrypted_inode(dir)) {
-		int res = fscrypt_get_encryption_info(dir);
-
-		/*
-		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
-		 * created while the directory was encrypted and we
-		 * don't have access to the key.
-		 */
-		if (fscrypt_has_encryption_key(dir))
-			fscrypt_set_encrypted_dentry(dentry);
-		fscrypt_set_d_op(dentry);
-		if (res && res != -ENOKEY)
-			return ERR_PTR(res);
-	}
+	err = fscrypt_prepare_lookup(dir, dentry, flags);
+	if (err)
+		return ERR_PTR(err);
 
 	if (dentry->d_name.len > F2FS_NAME_LEN)
 		return ERR_PTR(-ENAMETOOLONG);
-- 
2.14.1.821.g8fa685d3b7-goog


------------------------------------------------------------------------------
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[PATCH 20/25] f2fs: switch to fscrypt_prepare_setattr()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/f2fs/file.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 8cef3931a00b..629bb91fa44e 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -714,6 +714,10 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 	if (err)
 		return err;
 
+	err = fscrypt_prepare_setattr(dentry, attr);
+	if (err)
+		return err;
+
 	if (is_quota_modification(inode, attr)) {
 		err = dquot_initialize(inode);
 		if (err)
@@ -729,14 +733,6 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 	}
 
 	if (attr->ia_valid & ATTR_SIZE) {
-		if (f2fs_encrypted_inode(inode)) {
-			err = fscrypt_get_encryption_info(inode);
-			if (err)
-				return err;
-			if (!fscrypt_has_encryption_key(inode))
-				return -ENOKEY;
-		}
-
 		if (attr->ia_size <= i_size_read(inode)) {
 			down_write(&F2FS_I(inode)->i_mmap_sem);
 			truncate_setsize(inode, attr->ia_size);
-- 
2.14.1.821.g8fa685d3b7-goog


------------------------------------------------------------------------------
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[PATCH 21/25] ubifs: switch to fscrypt_file_open()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ubifs/file.c | 31 +------------------------------
 1 file changed, 1 insertion(+), 30 deletions(-)

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index a02aa59d1e24..31dc632a52fc 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1629,35 +1629,6 @@ static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
 	return 0;
 }
 
-static int ubifs_file_open(struct inode *inode, struct file *filp)
-{
-	int ret;
-	struct dentry *dir;
-	struct ubifs_info *c = inode->i_sb->s_fs_info;
-
-	if (ubifs_crypt_is_encrypted(inode)) {
-		ret = fscrypt_get_encryption_info(inode);
-		if (ret)
-			return -EACCES;
-		if (!fscrypt_has_encryption_key(inode))
-			return -ENOKEY;
-	}
-
-	dir = dget_parent(file_dentry(filp));
-	if (ubifs_crypt_is_encrypted(d_inode(dir)) &&
-			!fscrypt_has_permitted_context(d_inode(dir), inode)) {
-		ubifs_err(c, "Inconsistent encryption contexts: %lu/%lu",
-			  (unsigned long) d_inode(dir)->i_ino,
-			  (unsigned long) inode->i_ino);
-		dput(dir);
-		ubifs_ro_mode(c, -EPERM);
-		return -EPERM;
-	}
-	dput(dir);
-
-	return 0;
-}
-
 static const char *ubifs_get_link(struct dentry *dentry,
 					    struct inode *inode,
 					    struct delayed_call *done)
@@ -1746,7 +1717,7 @@ const struct file_operations ubifs_file_operations = {
 	.unlocked_ioctl = ubifs_ioctl,
 	.splice_read	= generic_file_splice_read,
 	.splice_write	= iter_file_splice_write,
-	.open		= ubifs_file_open,
+	.open		= fscrypt_file_open,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl   = ubifs_compat_ioctl,
 #endif
-- 
2.14.1.821.g8fa685d3b7-goog


------------------------------------------------------------------------------
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[PATCH 22/25] ubifs: switch to fscrypt_prepare_link()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ubifs/dir.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 417fe0b29f23..09e6c56b11bc 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -743,9 +743,9 @@ static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
 	ubifs_assert(inode_is_locked(dir));
 	ubifs_assert(inode_is_locked(inode));
 
-	if (ubifs_crypt_is_encrypted(dir) &&
-	    !fscrypt_has_permitted_context(dir, inode))
-		return -EPERM;
+	err = fscrypt_prepare_link(old_dentry, dir, dentry);
+	if (err)
+		return err;
 
 	err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
 	if (err)
-- 
2.14.1.821.g8fa685d3b7-goog


------------------------------------------------------------------------------
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[PATCH 23/25] ubifs: switch to fscrypt_prepare_rename()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ubifs/dir.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 09e6c56b11bc..7bf847d79b4a 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1353,12 +1353,6 @@ static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if (unlink)
 		ubifs_assert(inode_is_locked(new_inode));
 
-	if (old_dir != new_dir) {
-		if (ubifs_crypt_is_encrypted(new_dir) &&
-		    !fscrypt_has_permitted_context(new_dir, old_inode))
-			return -EPERM;
-	}
-
 	if (unlink && is_dir) {
 		err = ubifs_check_dir_empty(new_inode);
 		if (err)
@@ -1573,13 +1567,6 @@ static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
 
 	ubifs_assert(fst_inode && snd_inode);
 
-	if ((ubifs_crypt_is_encrypted(old_dir) ||
-	    ubifs_crypt_is_encrypted(new_dir)) &&
-	    (old_dir != new_dir) &&
-	    (!fscrypt_has_permitted_context(new_dir, fst_inode) ||
-	     !fscrypt_has_permitted_context(old_dir, snd_inode)))
-		return -EPERM;
-
 	err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm);
 	if (err)
 		return err;
@@ -1624,12 +1611,19 @@ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
+	int err;
+
 	if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
 		return -EINVAL;
 
 	ubifs_assert(inode_is_locked(old_dir));
 	ubifs_assert(inode_is_locked(new_dir));
 
+	err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
+				     flags);
+	if (err)
+		return err;
+
 	if (flags & RENAME_EXCHANGE)
 		return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
 
-- 
2.14.1.821.g8fa685d3b7-goog


------------------------------------------------------------------------------
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[PATCH 24/25] ubifs: switch to fscrypt_prepare_lookup()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ubifs/dir.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 7bf847d79b4a..a2ea4856e67b 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -220,20 +220,9 @@ static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
 
 	dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
 
-	if (ubifs_crypt_is_encrypted(dir)) {
-		err = fscrypt_get_encryption_info(dir);
-
-		/*
-		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
-		 * created while the directory was encrypted and we
-		 * have access to the key.
-		 */
-		if (fscrypt_has_encryption_key(dir))
-			fscrypt_set_encrypted_dentry(dentry);
-		fscrypt_set_d_op(dentry);
-		if (err && err != -ENOKEY)
-			return ERR_PTR(err);
-	}
+	err = fscrypt_prepare_lookup(dir, dentry, flags);
+	if (err)
+		return ERR_PTR(err);
 
 	err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
 	if (err)
-- 
2.14.1.821.g8fa685d3b7-goog

[PATCH 25/25] ubifs: switch to fscrypt_prepare_setattr()

[Eric Biggers]

From: Eric Biggers <ebiggers@google.com>

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/ubifs/file.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 31dc632a52fc..f5578f1bd170 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1284,13 +1284,9 @@ int ubifs_setattr(struct dentry *dentry, struct iattr *attr)
 	if (err)
 		return err;
 
-	if (ubifs_crypt_is_encrypted(inode) && (attr->ia_valid & ATTR_SIZE)) {
-		err = fscrypt_get_encryption_info(inode);
-		if (err)
-			return err;
-		if (!fscrypt_has_encryption_key(inode))
-			return -ENOKEY;
-	}
+	err = fscrypt_prepare_setattr(dentry, attr);
+	if (err)
+		return err;
 
 	if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size < inode->i_size)
 		/* Truncation to a smaller size */
-- 
2.14.1.821.g8fa685d3b7-goog

Re: [PATCH 00/25] fscrypt: add some higher-level helper functions

[Dave Chinner]

On Wed, Sep 20, 2017 at 03:45:40PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> This series reduces code duplication among ext4, f2fs, and ubifs by
> introducing a S_ENCRYPTED inode flag (so we don't have to call back into
> the filesystem to test the filesystem-specific inode flag), then
> introducing new helper functions that are called at the beginning of the
> open, link, rename, lookup, and setattr operations.
> 
> In the future we maybe should even call these new helpers from the VFS
> so that each individual filesystem doesn't have to do it.  But that's
> not possible currently because fs/crypto/ can be built as a module.
> 
> Making changes like this is a bit challenging due to interdependencies
> between fscrypt and the individual filesystems, all of which have
> different maintainers.  For now my intent is that patches 1-10 be taken
> through the fscrypt tree --- though it's not perfect since patches 1-4
> do make some changes to each filesystem, as everyone must set
> S_ENCRYPTED before we can use it everywhere in the shared code.  But
> afterwards, patches 11-25 can be picked up by the individual filesystems
> to switch to the new helpers.

This all looks much nicer. Having just been looking at this stuff,
it makes the code much simpler to understand. So:

Acked-by: Dave Chinner <dchinner@redhat.com>

While I'm here, the fscrypt header file includes are clunky and
nasty. I worte a quick patch a couple of days ago to clean it up.
See below....

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com


fscrypto: clean up include file mess

From: Dave Chinner <dchinner@redhat.com>

Filesystems have to include different header files based on whether
they are compiled with encryption support or not. That's nasty and
messy.

Instead, rationalise the headers so we have a single include
fscrypt.h and let it decide what internal implementation to include
based on the __FS_HAS_ENCRYPTION define. Filesystems set
__FS_HAS_ENCRYPTION before including linux/fscrypt.h if they are
built with encryption support.

Add guards to prevent fscrypt_supp.h and fscrypt_notsupp.h from
being directly included by filesystems.

Signed-Off-By: Dave Chinner <dchinner@redhat.com>
---
 fs/crypto/fscrypt_private.h                   |  3 +-
 fs/ext4/ext4.h                                | 11 +++----
 fs/f2fs/f2fs.h                                |  8 +++---
 fs/ubifs/ubifs.h                              |  9 +++---
 include/linux/{fscrypt_common.h => fscrypt.h} | 41 ++++++++++++++++++---------
 include/linux/fscrypt_notsupp.h               |  7 +++--
 include/linux/fscrypt_supp.h                  |  7 +++--
 7 files changed, 54 insertions(+), 32 deletions(-)

diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index a1d5021c31ef..a180981ee6d7 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -11,7 +11,8 @@
 #ifndef _FSCRYPT_PRIVATE_H
 #define _FSCRYPT_PRIVATE_H
 
-#include <linux/fscrypt_supp.h>
+#define __FS_HAS_ENCRYPTION 1
+#include <linux/fscrypt.h>
 #include <crypto/hash.h>
 
 /* Encryption parameters */
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index e2abe01c8c6b..900ac79879b3 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -33,17 +33,18 @@
 #include <linux/percpu_counter.h>
 #include <linux/ratelimit.h>
 #include <crypto/hash.h>
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
-#include <linux/fscrypt_supp.h>
-#else
-#include <linux/fscrypt_notsupp.h>
-#endif
+
 #include <linux/falloc.h>
 #include <linux/percpu-rwsem.h>
 #ifdef __KERNEL__
 #include <linux/compat.h>
 #endif
 
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
+#define __FS_HAS_ENCRYPTION 1
+#endif
+#include <linux/fscrypt.h>
+
 /*
  * The fourth extended filesystem constants/structures
  */
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9a7c90386947..66502c5f7d67 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -23,12 +23,12 @@
 #include <linux/bio.h>
 #include <linux/blkdev.h>
 #include <linux/quotaops.h>
+#include <crypto/hash.h>
+
 #ifdef CONFIG_F2FS_FS_ENCRYPTION
-#include <linux/fscrypt_supp.h>
-#else
-#include <linux/fscrypt_notsupp.h>
+#define __FS_HAS_ENCRYPTION 1
 #endif
-#include <crypto/hash.h>
+#include <linux/fscrypt.h>
 
 #ifdef CONFIG_F2FS_CHECK_FS
 #define f2fs_bug_on(sbi, condition)	BUG_ON(condition)
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index cd43651f1731..e5b6c8f02133 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -38,12 +38,13 @@
 #include <linux/backing-dev.h>
 #include <linux/security.h>
 #include <linux/xattr.h>
+#include <linux/random.h>
+
 #ifdef CONFIG_UBIFS_FS_ENCRYPTION
-#include <linux/fscrypt_supp.h>
-#else
-#include <linux/fscrypt_notsupp.h>
+#define __FS_HAS_ENCRYPTION 1
 #endif
-#include <linux/random.h>
+#include <linux/fscrypt.h>
+
 #include "ubifs-media.h"
 
 /* Version of this UBIFS implementation */
diff --git a/include/linux/fscrypt_common.h b/include/linux/fscrypt.h
similarity index 79%
rename from include/linux/fscrypt_common.h
rename to include/linux/fscrypt.h
index 97f738628b36..4db0a7ec26d9 100644
--- a/include/linux/fscrypt_common.h
+++ b/include/linux/fscrypt.h
@@ -1,14 +1,17 @@
 /*
- * fscrypt_common.h: common declarations for per-file encryption
+ * fscrypt.h: declarations for per-file encryption
+ *
+ * Filesystems that implement per-file encryption include this header
+ * file with the __FS_HAS_ENCRYPTION set according to whether that filesystem
+ * is being built with encryption support or not.
  *
  * Copyright (C) 2015, Google, Inc.
  *
  * Written by Michael Halcrow, 2015.
  * Modified by Jaegeuk Kim, 2015.
  */
-
-#ifndef _LINUX_FSCRYPT_COMMON_H
-#define _LINUX_FSCRYPT_COMMON_H
+#ifndef _LINUX_FSCRYPT_H
+#define _LINUX_FSCRYPT_H
 
 #include <linux/key.h>
 #include <linux/fs.h>
@@ -119,23 +122,35 @@ static inline bool fscrypt_is_dot_dotdot(const struct qstr *str)
 	return false;
 }
 
+#ifdef __FS_HAS_ENCRYPTION
+
 static inline struct page *fscrypt_control_page(struct page *page)
 {
-#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
 	return ((struct fscrypt_ctx *)page_private(page))->w.control_page;
-#else
+}
+
+static inline bool fscrypt_has_encryption_key(const struct inode *inode)
+{
+	return (inode->i_crypt_info != NULL);
+}
+
+#include <linux/fscrypt_supp.h>
+
+#else /* !__FS_HAS_ENCRYPTION */
+
+static inline struct page *fscrypt_control_page(struct page *page)
+{
 	WARN_ON_ONCE(1);
 	return ERR_PTR(-EINVAL);
-#endif
 }
 
-static inline int fscrypt_has_encryption_key(const struct inode *inode)
+static inline bool fscrypt_has_encryption_key(const struct inode *inode)
 {
-#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
-	return (inode->i_crypt_info != NULL);
-#else
 	return 0;
-#endif
 }
 
-#endif	/* _LINUX_FSCRYPT_COMMON_H */
+#include <linux/fscrypt_notsupp.h>
+#endif	/* __FS_HAS_ENCRYPTION */
+
+
+#endif	/* _LINUX_FSCRYPT_H */
diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h
index ec406aed2f2f..2d0b6960831e 100644
--- a/include/linux/fscrypt_notsupp.h
+++ b/include/linux/fscrypt_notsupp.h
@@ -3,13 +3,16 @@
  *
  * This stubs out the fscrypt functions for filesystems configured without
  * encryption support.
+ *
+ * Do not include this file directly. Use fscrypt.h instead!
  */
+#ifndef _LINUX_FSCRYPT_H
+#error "Incorrect include of linux/fscrypt_notsupp.h!"
+#endif
 
 #ifndef _LINUX_FSCRYPT_NOTSUPP_H
 #define _LINUX_FSCRYPT_NOTSUPP_H
 
-#include <linux/fscrypt_common.h>
-
 /* crypto.c */
 static inline struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode,
 						  gfp_t gfp_flags)
diff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
index 32e2fcf13b01..5a90e5ef4687 100644
--- a/include/linux/fscrypt_supp.h
+++ b/include/linux/fscrypt_supp.h
@@ -1,14 +1,15 @@
 /*
  * fscrypt_supp.h
  *
- * This is included by filesystems configured with encryption support.
+ * Do not include this file directly. Use fscrypt.h instead!
  */
+#ifndef _LINUX_FSCRYPT_H
+#error "Incorrect include of linux/fscrypt_supp.h!"
+#endif
 
 #ifndef _LINUX_FSCRYPT_SUPP_H
 #define _LINUX_FSCRYPT_SUPP_H
 
-#include <linux/fscrypt_common.h>
-
 /* crypto.c */
 extern struct kmem_cache *fscrypt_info_cachep;
 extern struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *, gfp_t);

Re: [PATCH 00/25] fscrypt: add some higher-level helper functions

[Eric Biggers]

Hi Dave,

On Thu, Sep 21, 2017 at 04:45:02PM +1000, Dave Chinner wrote:
> fscrypto: clean up include file mess
> 
> From: Dave Chinner <dchinner@redhat.com>
> 
> Filesystems have to include different header files based on whether
> they are compiled with encryption support or not. That's nasty and
> messy.
> 
> Instead, rationalise the headers so we have a single include
> fscrypt.h and let it decide what internal implementation to include
> based on the __FS_HAS_ENCRYPTION define. Filesystems set
> __FS_HAS_ENCRYPTION before including linux/fscrypt.h if they are
> built with encryption support.
> 
> Add guards to prevent fscrypt_supp.h and fscrypt_notsupp.h from
> being directly included by filesystems.

This looks good; we probably should have done it that way originally.  This will
allow us to have the inline functions like fscrypt_prepare_rename() defined in
fscrypt.h, and then have supp/notsupp versions of __fscrypt_prepare_rename()
instead --- so common checks like for IS_ENCRYPTED() will be in one place only.

One nit:

> +#ifdef CONFIG_EXT4_FS_ENCRYPTION
> +#define __FS_HAS_ENCRYPTION 1
> +#endif
> +#include <linux/fscrypt.h>

How about doing

	#define __FS_HAS_ENCRYPTION IS_ENABLED(CONFIG_EXT4_FS_ENCRYPTION)

(and likewise for f2fs and ubifs), then checking '#if __FS_HAS_ENCRYPTION'
rather than '#ifdef __FS_HAS_ENCRYPTION'?

Eric

Re: [PATCH 00/25] fscrypt: add some higher-level helper functions

[Dave Chinner]

On Thu, Sep 21, 2017 at 10:47:05AM -0700, Eric Biggers wrote:
> Hi Dave,
> 
> On Thu, Sep 21, 2017 at 04:45:02PM +1000, Dave Chinner wrote:
> > fscrypto: clean up include file mess
> > 
> > From: Dave Chinner <dchinner@redhat.com>
> > 
> > Filesystems have to include different header files based on whether
> > they are compiled with encryption support or not. That's nasty and
> > messy.
> > 
> > Instead, rationalise the headers so we have a single include
> > fscrypt.h and let it decide what internal implementation to include
> > based on the __FS_HAS_ENCRYPTION define. Filesystems set
> > __FS_HAS_ENCRYPTION before including linux/fscrypt.h if they are
> > built with encryption support.
> > 
> > Add guards to prevent fscrypt_supp.h and fscrypt_notsupp.h from
> > being directly included by filesystems.
> 
> This looks good; we probably should have done it that way originally.  This will
> allow us to have the inline functions like fscrypt_prepare_rename() defined in
> fscrypt.h, and then have supp/notsupp versions of __fscrypt_prepare_rename()
> instead --- so common checks like for IS_ENCRYPTED() will be in one place only.

*nod*

> One nit:
> 
> > +#ifdef CONFIG_EXT4_FS_ENCRYPTION
> > +#define __FS_HAS_ENCRYPTION 1
> > +#endif
> > +#include <linux/fscrypt.h>
> 
> How about doing
> 
> 	#define __FS_HAS_ENCRYPTION IS_ENABLED(CONFIG_EXT4_FS_ENCRYPTION)
> 
> (and likewise for f2fs and ubifs), then checking '#if __FS_HAS_ENCRYPTION'
> rather than '#ifdef __FS_HAS_ENCRYPTION'?

Yeah, that's cleaner. I'll modify it and resend as a standalone
patch.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

Re: [f2fs-dev] [PATCH 00/25] fscrypt: add some higher-level helper functions

[Chao Yu]

On 2017/9/21 6:45, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> This series reduces code duplication among ext4, f2fs, and ubifs by
> introducing a S_ENCRYPTED inode flag (so we don't have to call back into
> the filesystem to test the filesystem-specific inode flag), then
> introducing new helper functions that are called at the beginning of the
> open, link, rename, lookup, and setattr operations.
> 
> In the future we maybe should even call these new helpers from the VFS
> so that each individual filesystem doesn't have to do it.  But that's
> not possible currently because fs/crypto/ can be built as a module.
> 
> Making changes like this is a bit challenging due to interdependencies
> between fscrypt and the individual filesystems, all of which have
> different maintainers.  For now my intent is that patches 1-10 be taken
> through the fscrypt tree --- though it's not perfect since patches 1-4
> do make some changes to each filesystem, as everyone must set
> S_ENCRYPTED before we can use it everywhere in the shared code.  But
> afterwards, patches 11-25 can be picked up by the individual filesystems
> to switch to the new helpers.

For all patches touching f2fs, looks good to me, feel free to add:

Reviewed-by: Chao Yu <yuchao0@huawei.com>

> 
> Eric Biggers (25):
>   fs, fscrypt: add an S_ENCRYPTED inode flag
>   fscrypt: switch from ->is_encrypted() to IS_ENCRYPTED()
>   fscrypt: remove ->is_encrypted()
>   fscrypt: remove unneeded empty fscrypt_operations structs
>   fscrypt: new helper function - fscrypt_require_key()
>   fscrypt: new helper function - fscrypt_file_open()
>   fscrypt: new helper function - fscrypt_prepare_link()
>   fscrypt: new helper function - fscrypt_prepare_rename()
>   fscrypt: new helper function - fscrypt_prepare_lookup()
>   fscrypt: new helper function - fscrypt_prepare_setattr()
>   ext4: switch to fscrypt_file_open()
>   ext4: switch to fscrypt_prepare_link()
>   ext4: switch to fscrypt_prepare_rename()
>   ext4: switch to fscrypt_prepare_lookup()
>   ext4: switch to fscrypt_prepare_setattr()
>   f2fs: switch to fscrypt_file_open()
>   f2fs: switch to fscrypt_prepare_link()
>   f2fs: switch to fscrypt_prepare_rename()
>   f2fs: switch to fscrypt_prepare_lookup()
>   f2fs: switch to fscrypt_prepare_setattr()
>   ubifs: switch to fscrypt_file_open()
>   ubifs: switch to fscrypt_prepare_link()
>   ubifs: switch to fscrypt_prepare_rename()
>   ubifs: switch to fscrypt_prepare_lookup()
>   ubifs: switch to fscrypt_prepare_setattr()
> 
>  fs/crypto/Makefile              |   2 +-
>  fs/crypto/crypto.c              |   2 +-
>  fs/crypto/fname.c               |   3 +-
>  fs/crypto/hooks.c               | 112 +++++++++++++++++++++++++++++
>  fs/crypto/keyinfo.c             |   2 +-
>  fs/crypto/policy.c              |   6 +-
>  fs/ext4/file.c                  |  23 ++----
>  fs/ext4/inode.c                 |  19 +++--
>  fs/ext4/namei.c                 |  62 +++++-----------
>  fs/ext4/super.c                 |  15 ++--
>  fs/f2fs/f2fs.h                  |   1 +
>  fs/f2fs/file.c                  |  30 ++------
>  fs/f2fs/inode.c                 |   5 +-
>  fs/f2fs/namei.c                 |  54 ++++----------
>  fs/f2fs/super.c                 |   7 +-
>  fs/ubifs/crypto.c               |   1 -
>  fs/ubifs/dir.c                  |  43 ++++-------
>  fs/ubifs/file.c                 |  41 ++---------
>  fs/ubifs/ioctl.c                |   5 +-
>  fs/ubifs/super.c                |   8 +--
>  fs/ubifs/ubifs.h                |   9 +--
>  fs/ubifs/xattr.c                |   1 +
>  include/linux/fs.h              |   2 +
>  include/linux/fscrypt_common.h  |   1 -
>  include/linux/fscrypt_notsupp.h |  54 +++++++++++++-
>  include/linux/fscrypt_supp.h    | 153 ++++++++++++++++++++++++++++++++++++++++
>  26 files changed, 418 insertions(+), 243 deletions(-)
>  create mode 100644 fs/crypto/hooks.c
>