mirror of https://github.com/OpenIPC/firmware.git
222 lines
8.0 KiB
Diff
222 lines
8.0 KiB
Diff
diff -drupN a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h
|
|
--- a/include/linux/fscrypt_supp.h 1970-01-01 03:00:00.000000000 +0300
|
|
+++ b/include/linux/fscrypt_supp.h 2022-06-12 05:28:14.000000000 +0300
|
|
@@ -0,0 +1,217 @@
|
|
+/*
|
|
+ * fscrypt_supp.h
|
|
+ *
|
|
+ * 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/mm.h>
|
|
+#include <linux/slab.h>
|
|
+
|
|
+/*
|
|
+ * fscrypt superblock flags
|
|
+ */
|
|
+#define FS_CFLG_OWN_PAGES (1U << 1)
|
|
+
|
|
+/*
|
|
+ * crypto operations for filesystems
|
|
+ */
|
|
+struct fscrypt_operations {
|
|
+ unsigned int flags;
|
|
+ const char *key_prefix;
|
|
+ int (*get_context)(struct inode *, void *, size_t);
|
|
+ int (*set_context)(struct inode *, const void *, size_t, void *);
|
|
+ bool (*dummy_context)(struct inode *);
|
|
+ bool (*empty_dir)(struct inode *);
|
|
+ unsigned (*max_namelen)(struct inode *);
|
|
+};
|
|
+
|
|
+struct fscrypt_ctx {
|
|
+ union {
|
|
+ struct {
|
|
+ struct page *bounce_page; /* Ciphertext page */
|
|
+ struct page *control_page; /* Original page */
|
|
+ } w;
|
|
+ struct {
|
|
+ struct bio *bio;
|
|
+ struct work_struct work;
|
|
+ } r;
|
|
+ struct list_head free_list; /* Free list */
|
|
+ };
|
|
+ u8 flags; /* Flags */
|
|
+};
|
|
+
|
|
+static inline bool fscrypt_has_encryption_key(const struct inode *inode)
|
|
+{
|
|
+ return (inode->i_crypt_info != NULL);
|
|
+}
|
|
+
|
|
+static inline bool fscrypt_dummy_context_enabled(struct inode *inode)
|
|
+{
|
|
+ return inode->i_sb->s_cop->dummy_context &&
|
|
+ inode->i_sb->s_cop->dummy_context(inode);
|
|
+}
|
|
+
|
|
+/* crypto.c */
|
|
+extern void fscrypt_enqueue_decrypt_work(struct work_struct *);
|
|
+extern struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *, gfp_t);
|
|
+extern void fscrypt_release_ctx(struct fscrypt_ctx *);
|
|
+extern struct page *fscrypt_encrypt_page(const struct inode *, struct page *,
|
|
+ unsigned int, unsigned int,
|
|
+ u64, gfp_t);
|
|
+extern int fscrypt_decrypt_page(const struct inode *, struct page *, unsigned int,
|
|
+ unsigned int, u64);
|
|
+
|
|
+static inline struct page *fscrypt_control_page(struct page *page)
|
|
+{
|
|
+ return ((struct fscrypt_ctx *)page_private(page))->w.control_page;
|
|
+}
|
|
+
|
|
+extern void fscrypt_restore_control_page(struct page *);
|
|
+
|
|
+extern const struct dentry_operations fscrypt_d_ops;
|
|
+
|
|
+static inline void fscrypt_set_d_op(struct dentry *dentry)
|
|
+{
|
|
+ d_set_d_op(dentry, &fscrypt_d_ops);
|
|
+}
|
|
+
|
|
+static inline void fscrypt_set_encrypted_dentry(struct dentry *dentry)
|
|
+{
|
|
+ spin_lock(&dentry->d_lock);
|
|
+ dentry->d_flags |= DCACHE_ENCRYPTED_WITH_KEY;
|
|
+ spin_unlock(&dentry->d_lock);
|
|
+}
|
|
+
|
|
+/* policy.c */
|
|
+extern int fscrypt_ioctl_set_policy(struct file *, const void __user *);
|
|
+extern int fscrypt_ioctl_get_policy(struct file *, void __user *);
|
|
+extern int fscrypt_has_permitted_context(struct inode *, struct inode *);
|
|
+extern int fscrypt_inherit_context(struct inode *, struct inode *,
|
|
+ void *, bool);
|
|
+/* keyinfo.c */
|
|
+extern int fscrypt_get_encryption_info(struct inode *);
|
|
+extern void fscrypt_put_encryption_info(struct inode *);
|
|
+
|
|
+/* fname.c */
|
|
+extern int fscrypt_setup_filename(struct inode *, const struct qstr *,
|
|
+ int lookup, struct fscrypt_name *);
|
|
+
|
|
+static inline void fscrypt_free_filename(struct fscrypt_name *fname)
|
|
+{
|
|
+ kfree(fname->crypto_buf.name);
|
|
+}
|
|
+
|
|
+extern int fscrypt_fname_alloc_buffer(const struct inode *, u32,
|
|
+ struct fscrypt_str *);
|
|
+extern void fscrypt_fname_free_buffer(struct fscrypt_str *);
|
|
+extern int fscrypt_fname_disk_to_usr(struct inode *, u32, u32,
|
|
+ const struct fscrypt_str *, struct fscrypt_str *);
|
|
+
|
|
+#define FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE 32
|
|
+
|
|
+/* Extracts the second-to-last ciphertext block; see explanation below */
|
|
+#define FSCRYPT_FNAME_DIGEST(name, len) \
|
|
+ ((name) + round_down((len) - FS_CRYPTO_BLOCK_SIZE - 1, \
|
|
+ FS_CRYPTO_BLOCK_SIZE))
|
|
+
|
|
+#define FSCRYPT_FNAME_DIGEST_SIZE FS_CRYPTO_BLOCK_SIZE
|
|
+
|
|
+/**
|
|
+ * fscrypt_digested_name - alternate identifier for an on-disk filename
|
|
+ *
|
|
+ * When userspace lists an encrypted directory without access to the key,
|
|
+ * filenames whose ciphertext is longer than FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE
|
|
+ * bytes are shown in this abbreviated form (base64-encoded) rather than as the
|
|
+ * full ciphertext (base64-encoded). This is necessary to allow supporting
|
|
+ * filenames up to NAME_MAX bytes, since base64 encoding expands the length.
|
|
+ *
|
|
+ * To make it possible for filesystems to still find the correct directory entry
|
|
+ * despite not knowing the full on-disk name, we encode any filesystem-specific
|
|
+ * 'hash' and/or 'minor_hash' which the filesystem may need for its lookups,
|
|
+ * followed by the second-to-last ciphertext block of the filename. Due to the
|
|
+ * use of the CBC-CTS encryption mode, the second-to-last ciphertext block
|
|
+ * depends on the full plaintext. (Note that ciphertext stealing causes the
|
|
+ * last two blocks to appear "flipped".) This makes accidental collisions very
|
|
+ * unlikely: just a 1 in 2^128 chance for two filenames to collide even if they
|
|
+ * share the same filesystem-specific hashes.
|
|
+ *
|
|
+ * However, this scheme isn't immune to intentional collisions, which can be
|
|
+ * created by anyone able to create arbitrary plaintext filenames and view them
|
|
+ * without the key. Making the "digest" be a real cryptographic hash like
|
|
+ * SHA-256 over the full ciphertext would prevent this, although it would be
|
|
+ * less efficient and harder to implement, especially since the filesystem would
|
|
+ * need to calculate it for each directory entry examined during a search.
|
|
+ */
|
|
+struct fscrypt_digested_name {
|
|
+ u32 hash;
|
|
+ u32 minor_hash;
|
|
+ u8 digest[FSCRYPT_FNAME_DIGEST_SIZE];
|
|
+};
|
|
+
|
|
+/**
|
|
+ * fscrypt_match_name() - test whether the given name matches a directory entry
|
|
+ * @fname: the name being searched for
|
|
+ * @de_name: the name from the directory entry
|
|
+ * @de_name_len: the length of @de_name in bytes
|
|
+ *
|
|
+ * Normally @fname->disk_name will be set, and in that case we simply compare
|
|
+ * that to the name stored in the directory entry. The only exception is that
|
|
+ * if we don't have the key for an encrypted directory and a filename in it is
|
|
+ * very long, then we won't have the full disk_name and we'll instead need to
|
|
+ * match against the fscrypt_digested_name.
|
|
+ *
|
|
+ * Return: %true if the name matches, otherwise %false.
|
|
+ */
|
|
+static inline bool fscrypt_match_name(const struct fscrypt_name *fname,
|
|
+ const u8 *de_name, u32 de_name_len)
|
|
+{
|
|
+ if (unlikely(!fname->disk_name.name)) {
|
|
+ const struct fscrypt_digested_name *n =
|
|
+ (const void *)fname->crypto_buf.name;
|
|
+ if (WARN_ON_ONCE(fname->usr_fname->name[0] != '_'))
|
|
+ return false;
|
|
+ if (de_name_len <= FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE)
|
|
+ return false;
|
|
+ return !memcmp(FSCRYPT_FNAME_DIGEST(de_name, de_name_len),
|
|
+ n->digest, FSCRYPT_FNAME_DIGEST_SIZE);
|
|
+ }
|
|
+
|
|
+ if (de_name_len != fname->disk_name.len)
|
|
+ return false;
|
|
+ return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len);
|
|
+}
|
|
+
|
|
+/* bio.c */
|
|
+extern void fscrypt_decrypt_bio(struct bio *);
|
|
+extern void fscrypt_enqueue_decrypt_bio(struct fscrypt_ctx *ctx,
|
|
+ struct bio *bio);
|
|
+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 */
|
|
+extern int fscrypt_file_open(struct inode *inode, struct file *filp);
|
|
+extern int __fscrypt_prepare_link(struct inode *inode, struct inode *dir);
|
|
+extern int __fscrypt_prepare_rename(struct inode *old_dir,
|
|
+ struct dentry *old_dentry,
|
|
+ struct inode *new_dir,
|
|
+ struct dentry *new_dentry,
|
|
+ unsigned int flags);
|
|
+extern int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry);
|
|
+extern int __fscrypt_prepare_symlink(struct inode *dir, unsigned int len,
|
|
+ unsigned int max_len,
|
|
+ struct fscrypt_str *disk_link);
|
|
+extern int __fscrypt_encrypt_symlink(struct inode *inode, const char *target,
|
|
+ unsigned int len,
|
|
+ struct fscrypt_str *disk_link);
|
|
+extern const char *fscrypt_get_symlink(struct inode *inode, const void *caddr,
|
|
+ unsigned int max_size,
|
|
+ struct delayed_call *done);
|
|
+
|
|
+#endif /* _LINUX_FSCRYPT_SUPP_H */
|