diff options
Diffstat (limited to 'fs/crypto')
| -rw-r--r-- | fs/crypto/crypto.c | 50 | ||||
| -rw-r--r-- | fs/crypto/fname.c | 49 | ||||
| -rw-r--r-- | fs/crypto/fscrypt_private.h | 2 |
3 files changed, 50 insertions, 51 deletions
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index 3719efa546c6..fcc6ca792ba2 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -25,8 +25,6 @@ #include <linux/module.h> #include <linux/scatterlist.h> #include <linux/ratelimit.h> -#include <linux/dcache.h> -#include <linux/namei.h> #include <crypto/skcipher.h> #include "fscrypt_private.h" @@ -286,54 +284,6 @@ int fscrypt_decrypt_block_inplace(const struct inode *inode, struct page *page, } EXPORT_SYMBOL(fscrypt_decrypt_block_inplace); -/* - * Validate dentries in encrypted directories to make sure we aren't potentially - * caching stale dentries after a key has been added. - */ -static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) -{ - struct dentry *dir; - int err; - int valid; - - /* - * Plaintext names are always valid, since fscrypt doesn't support - * reverting to ciphertext names without evicting the directory's inode - * -- which implies eviction of the dentries in the directory. - */ - if (!(dentry->d_flags & DCACHE_ENCRYPTED_NAME)) - return 1; - - /* - * Ciphertext name; valid if the directory's key is still unavailable. - * - * Although fscrypt forbids rename() on ciphertext names, we still must - * use dget_parent() here rather than use ->d_parent directly. That's - * because a corrupted fs image may contain directory hard links, which - * the VFS handles by moving the directory's dentry tree in the dcache - * each time ->lookup() finds the directory and it already has a dentry - * elsewhere. Thus ->d_parent can be changing, and we must safely grab - * a reference to some ->d_parent to prevent it from being freed. - */ - - if (flags & LOOKUP_RCU) - return -ECHILD; - - dir = dget_parent(dentry); - err = fscrypt_get_encryption_info(d_inode(dir)); - valid = !fscrypt_has_encryption_key(d_inode(dir)); - dput(dir); - - if (err < 0) - return err; - - return valid; -} - -const struct dentry_operations fscrypt_d_ops = { - .d_revalidate = fscrypt_d_revalidate, -}; - /** * fscrypt_initialize() - allocate major buffers for fs encryption. * @cop_flags: fscrypt operations flags diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c index c87b71aa2353..3fd27e14ebdd 100644 --- a/fs/crypto/fname.c +++ b/fs/crypto/fname.c @@ -11,6 +11,7 @@ * This has not yet undergone a rigorous security audit. */ +#include <linux/namei.h> #include <linux/scatterlist.h> #include <crypto/skcipher.h> #include "fscrypt_private.h" @@ -400,3 +401,51 @@ errout: return ret; } EXPORT_SYMBOL(fscrypt_setup_filename); + +/* + * Validate dentries in encrypted directories to make sure we aren't potentially + * caching stale dentries after a key has been added. + */ +static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) +{ + struct dentry *dir; + int err; + int valid; + + /* + * Plaintext names are always valid, since fscrypt doesn't support + * reverting to ciphertext names without evicting the directory's inode + * -- which implies eviction of the dentries in the directory. + */ + if (!(dentry->d_flags & DCACHE_ENCRYPTED_NAME)) + return 1; + + /* + * Ciphertext name; valid if the directory's key is still unavailable. + * + * Although fscrypt forbids rename() on ciphertext names, we still must + * use dget_parent() here rather than use ->d_parent directly. That's + * because a corrupted fs image may contain directory hard links, which + * the VFS handles by moving the directory's dentry tree in the dcache + * each time ->lookup() finds the directory and it already has a dentry + * elsewhere. Thus ->d_parent can be changing, and we must safely grab + * a reference to some ->d_parent to prevent it from being freed. + */ + + if (flags & LOOKUP_RCU) + return -ECHILD; + + dir = dget_parent(dentry); + err = fscrypt_get_encryption_info(d_inode(dir)); + valid = !fscrypt_has_encryption_key(d_inode(dir)); + dput(dir); + + if (err < 0) + return err; + + return valid; +} + +const struct dentry_operations fscrypt_d_ops = { + .d_revalidate = fscrypt_d_revalidate, +}; diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index 5792ecbd4d24..37c418d23962 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -233,7 +233,6 @@ extern int fscrypt_crypt_block(const struct inode *inode, unsigned int len, unsigned int offs, gfp_t gfp_flags); extern struct page *fscrypt_alloc_bounce_page(gfp_t gfp_flags); -extern const struct dentry_operations fscrypt_d_ops; extern void __printf(3, 4) __cold fscrypt_msg(const struct inode *inode, const char *level, const char *fmt, ...); @@ -265,6 +264,7 @@ extern int fname_encrypt(const struct inode *inode, const struct qstr *iname, extern bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len, u32 max_len, u32 *encrypted_len_ret); +extern const struct dentry_operations fscrypt_d_ops; /* hkdf.c */ |