F: fs/fscache/
F: include/linux/fscache*.h
+FS-CRYPTO: FILE SYSTEM LEVEL ENCRYPTION SUPPORT
+M: Theodore Y. Ts'o <tytso@mit.edu>
+M: Jaegeuk Kim <jaegeuk@kernel.org>
+S: Supported
+F: fs/crypto/
+F: include/linux/fscrypto.h
+
F2FS FILE SYSTEM
M: Jaegeuk Kim <jaegeuk@kernel.org>
M: Changman Lee <cm224.lee@samsung.com>
return 1;
}
+/*
+ * Returns 1 if the passed-in block region is valid; 0 if some part overlaps
+ * with filesystem metadata blocksi.
+ */
+int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
+ unsigned int count)
+{
+ if ((start_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
+ (start_blk + count < start_blk) ||
+ (start_blk > le32_to_cpu(sbi->s_es->s_blocks_count)))
+ return 0;
+
+ /* Ensure we do not step over superblock */
+ if ((start_blk <= sbi->s_sb_block) &&
+ (start_blk + count >= sbi->s_sb_block))
+ return 0;
+
+
+ return 1;
+}
+
/*
* ext2_new_blocks() -- core block(s) allocation function
* @inode: file inode
*/
#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
#define EXT2_ERROR_FS 0x0002 /* Errors detected */
+#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
/*
* Mount flags
extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
unsigned long *, int *);
+extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
+ unsigned int count);
extern void ext2_free_blocks (struct inode *, unsigned long,
unsigned long);
extern unsigned long ext2_count_free_blocks (struct super_block *);
ei->i_frag_size = raw_inode->i_fsize;
ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
ei->i_dir_acl = 0;
+
+ if (ei->i_file_acl &&
+ !ext2_data_block_valid(EXT2_SB(sb), ei->i_file_acl, 1)) {
+ ext2_error(sb, "ext2_iget", "bad extended attribute block %u",
+ ei->i_file_acl);
+ brelse(bh);
+ ret = -EFSCORRUPTED;
+ goto bad_inode;
+ }
+
if (S_ISREG(inode->i_mode))
inode->i_size |= ((__u64)le32_to_cpu(raw_inode->i_size_high)) << 32;
else
ext2_xattr_delete_inode(struct inode *inode)
{
struct buffer_head *bh = NULL;
+ struct ext2_sb_info *sbi = EXT2_SB(inode->i_sb);
down_write(&EXT2_I(inode)->xattr_sem);
if (!EXT2_I(inode)->i_file_acl)
goto cleanup;
+
+ if (!ext2_data_block_valid(sbi, EXT2_I(inode)->i_file_acl, 0)) {
+ ext2_error(inode->i_sb, "ext2_xattr_delete_inode",
+ "inode %ld: xattr block %d is out of data blocks range",
+ inode->i_ino, EXT2_I(inode)->i_file_acl);
+ goto cleanup;
+ }
+
bh = sb_bread(inode->i_sb, EXT2_I(inode)->i_file_acl);
if (!bh) {
ext2_error(inode->i_sb, "ext2_xattr_delete_inode",
extended attributes for file security labels, say N.
config EXT4_ENCRYPTION
- tristate "Ext4 Encryption"
+ bool "Ext4 Encryption"
depends on EXT4_FS
- select CRYPTO_AES
- select CRYPTO_CBC
- select CRYPTO_ECB
- select CRYPTO_XTS
- select CRYPTO_CTS
- select CRYPTO_CTR
- select CRYPTO_SHA256
- select KEYS
- select ENCRYPTED_KEYS
+ select FS_ENCRYPTION
help
Enable encryption of ext4 files and directories. This
feature is similar to ecryptfs, but it is more memory
ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
-ext4-$(CONFIG_EXT4_FS_ENCRYPTION) += crypto_policy.o crypto.o \
- crypto_key.o crypto_fname.o
memset(bh->b_data, 0, sb->s_blocksize);
bit_max = ext4_num_base_meta_clusters(sb, block_group);
+ if ((bit_max >> 3) >= bh->b_size)
+ return -EFSCORRUPTED;
+
for (bit = 0; bit < bit_max; bit++)
ext4_set_bit(bit, bh->b_data);
jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id);
- jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal);
+ smp_mb();
+ if (EXT4_SB(sb)->s_mb_free_pending)
+ jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal);
return 1;
}
+++ /dev/null
-/*
- * linux/fs/ext4/crypto.c
- *
- * Copyright (C) 2015, Google, Inc.
- *
- * This contains encryption functions for ext4
- *
- * Written by Michael Halcrow, 2014.
- *
- * Filename encryption additions
- * Uday Savagaonkar, 2014
- * Encryption policy handling additions
- * Ildar Muslukhov, 2014
- *
- * This has not yet undergone a rigorous security audit.
- *
- * The usage of AES-XTS should conform to recommendations in NIST
- * Special Publication 800-38E and IEEE P1619/D16.
- */
-
-#include <crypto/skcipher.h>
-#include <keys/user-type.h>
-#include <keys/encrypted-type.h>
-#include <linux/ecryptfs.h>
-#include <linux/gfp.h>
-#include <linux/kernel.h>
-#include <linux/key.h>
-#include <linux/list.h>
-#include <linux/mempool.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/random.h>
-#include <linux/scatterlist.h>
-#include <linux/spinlock_types.h>
-#include <linux/namei.h>
-
-#include "ext4_extents.h"
-#include "xattr.h"
-
-/* Encryption added and removed here! (L: */
-
-static unsigned int num_prealloc_crypto_pages = 32;
-static unsigned int num_prealloc_crypto_ctxs = 128;
-
-module_param(num_prealloc_crypto_pages, uint, 0444);
-MODULE_PARM_DESC(num_prealloc_crypto_pages,
- "Number of crypto pages to preallocate");
-module_param(num_prealloc_crypto_ctxs, uint, 0444);
-MODULE_PARM_DESC(num_prealloc_crypto_ctxs,
- "Number of crypto contexts to preallocate");
-
-static mempool_t *ext4_bounce_page_pool;
-
-static LIST_HEAD(ext4_free_crypto_ctxs);
-static DEFINE_SPINLOCK(ext4_crypto_ctx_lock);
-
-static struct kmem_cache *ext4_crypto_ctx_cachep;
-struct kmem_cache *ext4_crypt_info_cachep;
-
-/**
- * ext4_release_crypto_ctx() - Releases an encryption context
- * @ctx: The encryption context to release.
- *
- * If the encryption context was allocated from the pre-allocated pool, returns
- * it to that pool. Else, frees it.
- *
- * If there's a bounce page in the context, this frees that.
- */
-void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx)
-{
- unsigned long flags;
-
- if (ctx->flags & EXT4_WRITE_PATH_FL && ctx->w.bounce_page)
- mempool_free(ctx->w.bounce_page, ext4_bounce_page_pool);
- ctx->w.bounce_page = NULL;
- ctx->w.control_page = NULL;
- if (ctx->flags & EXT4_CTX_REQUIRES_FREE_ENCRYPT_FL) {
- kmem_cache_free(ext4_crypto_ctx_cachep, ctx);
- } else {
- spin_lock_irqsave(&ext4_crypto_ctx_lock, flags);
- list_add(&ctx->free_list, &ext4_free_crypto_ctxs);
- spin_unlock_irqrestore(&ext4_crypto_ctx_lock, flags);
- }
-}
-
-/**
- * ext4_get_crypto_ctx() - Gets an encryption context
- * @inode: The inode for which we are doing the crypto
- *
- * Allocates and initializes an encryption context.
- *
- * Return: An allocated and initialized encryption context on success; error
- * value or NULL otherwise.
- */
-struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode,
- gfp_t gfp_flags)
-{
- struct ext4_crypto_ctx *ctx = NULL;
- int res = 0;
- unsigned long flags;
- struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
-
- if (ci == NULL)
- return ERR_PTR(-ENOKEY);
-
- /*
- * We first try getting the ctx from a free list because in
- * the common case the ctx will have an allocated and
- * initialized crypto tfm, so it's probably a worthwhile
- * optimization. For the bounce page, we first try getting it
- * from the kernel allocator because that's just about as fast
- * as getting it from a list and because a cache of free pages
- * should generally be a "last resort" option for a filesystem
- * to be able to do its job.
- */
- spin_lock_irqsave(&ext4_crypto_ctx_lock, flags);
- ctx = list_first_entry_or_null(&ext4_free_crypto_ctxs,
- struct ext4_crypto_ctx, free_list);
- if (ctx)
- list_del(&ctx->free_list);
- spin_unlock_irqrestore(&ext4_crypto_ctx_lock, flags);
- if (!ctx) {
- ctx = kmem_cache_zalloc(ext4_crypto_ctx_cachep, gfp_flags);
- if (!ctx) {
- res = -ENOMEM;
- goto out;
- }
- ctx->flags |= EXT4_CTX_REQUIRES_FREE_ENCRYPT_FL;
- } else {
- ctx->flags &= ~EXT4_CTX_REQUIRES_FREE_ENCRYPT_FL;
- }
- ctx->flags &= ~EXT4_WRITE_PATH_FL;
-
-out:
- if (res) {
- if (!IS_ERR_OR_NULL(ctx))
- ext4_release_crypto_ctx(ctx);
- ctx = ERR_PTR(res);
- }
- return ctx;
-}
-
-struct workqueue_struct *ext4_read_workqueue;
-static DEFINE_MUTEX(crypto_init);
-
-/**
- * ext4_exit_crypto() - Shutdown the ext4 encryption system
- */
-void ext4_exit_crypto(void)
-{
- struct ext4_crypto_ctx *pos, *n;
-
- list_for_each_entry_safe(pos, n, &ext4_free_crypto_ctxs, free_list)
- kmem_cache_free(ext4_crypto_ctx_cachep, pos);
- INIT_LIST_HEAD(&ext4_free_crypto_ctxs);
- if (ext4_bounce_page_pool)
- mempool_destroy(ext4_bounce_page_pool);
- ext4_bounce_page_pool = NULL;
- if (ext4_read_workqueue)
- destroy_workqueue(ext4_read_workqueue);
- ext4_read_workqueue = NULL;
- if (ext4_crypto_ctx_cachep)
- kmem_cache_destroy(ext4_crypto_ctx_cachep);
- ext4_crypto_ctx_cachep = NULL;
- if (ext4_crypt_info_cachep)
- kmem_cache_destroy(ext4_crypt_info_cachep);
- ext4_crypt_info_cachep = NULL;
-}
-
-/**
- * ext4_init_crypto() - Set up for ext4 encryption.
- *
- * We only call this when we start accessing encrypted files, since it
- * results in memory getting allocated that wouldn't otherwise be used.
- *
- * Return: Zero on success, non-zero otherwise.
- */
-int ext4_init_crypto(void)
-{
- int i, res = -ENOMEM;
-
- mutex_lock(&crypto_init);
- if (ext4_read_workqueue)
- goto already_initialized;
- ext4_read_workqueue = alloc_workqueue("ext4_crypto", WQ_HIGHPRI, 0);
- if (!ext4_read_workqueue)
- goto fail;
-
- ext4_crypto_ctx_cachep = KMEM_CACHE(ext4_crypto_ctx,
- SLAB_RECLAIM_ACCOUNT);
- if (!ext4_crypto_ctx_cachep)
- goto fail;
-
- ext4_crypt_info_cachep = KMEM_CACHE(ext4_crypt_info,
- SLAB_RECLAIM_ACCOUNT);
- if (!ext4_crypt_info_cachep)
- goto fail;
-
- for (i = 0; i < num_prealloc_crypto_ctxs; i++) {
- struct ext4_crypto_ctx *ctx;
-
- ctx = kmem_cache_zalloc(ext4_crypto_ctx_cachep, GFP_NOFS);
- if (!ctx) {
- res = -ENOMEM;
- goto fail;
- }
- list_add(&ctx->free_list, &ext4_free_crypto_ctxs);
- }
-
- ext4_bounce_page_pool =
- mempool_create_page_pool(num_prealloc_crypto_pages, 0);
- if (!ext4_bounce_page_pool) {
- res = -ENOMEM;
- goto fail;
- }
-already_initialized:
- mutex_unlock(&crypto_init);
- return 0;
-fail:
- ext4_exit_crypto();
- mutex_unlock(&crypto_init);
- return res;
-}
-
-void ext4_restore_control_page(struct page *data_page)
-{
- struct ext4_crypto_ctx *ctx =
- (struct ext4_crypto_ctx *)page_private(data_page);
-
- set_page_private(data_page, (unsigned long)NULL);
- ClearPagePrivate(data_page);
- unlock_page(data_page);
- ext4_release_crypto_ctx(ctx);
-}
-
-/**
- * ext4_crypt_complete() - The completion callback for page encryption
- * @req: The asynchronous encryption request context
- * @res: The result of the encryption operation
- */
-static void ext4_crypt_complete(struct crypto_async_request *req, int res)
-{
- struct ext4_completion_result *ecr = req->data;
-
- if (res == -EINPROGRESS)
- return;
- ecr->res = res;
- complete(&ecr->completion);
-}
-
-typedef enum {
- EXT4_DECRYPT = 0,
- EXT4_ENCRYPT,
-} ext4_direction_t;
-
-static int ext4_page_crypto(struct inode *inode,
- ext4_direction_t rw,
- pgoff_t index,
- struct page *src_page,
- struct page *dest_page,
- gfp_t gfp_flags)
-
-{
- u8 xts_tweak[EXT4_XTS_TWEAK_SIZE];
- struct skcipher_request *req = NULL;
- DECLARE_EXT4_COMPLETION_RESULT(ecr);
- struct scatterlist dst, src;
- struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
- struct crypto_skcipher *tfm = ci->ci_ctfm;
- int res = 0;
-
- req = skcipher_request_alloc(tfm, gfp_flags);
- if (!req) {
- printk_ratelimited(KERN_ERR
- "%s: crypto_request_alloc() failed\n",
- __func__);
- return -ENOMEM;
- }
- skcipher_request_set_callback(
- req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
- ext4_crypt_complete, &ecr);
-
- BUILD_BUG_ON(EXT4_XTS_TWEAK_SIZE < sizeof(index));
- memcpy(xts_tweak, &index, sizeof(index));
- memset(&xts_tweak[sizeof(index)], 0,
- EXT4_XTS_TWEAK_SIZE - sizeof(index));
-
- sg_init_table(&dst, 1);
- sg_set_page(&dst, dest_page, PAGE_SIZE, 0);
- sg_init_table(&src, 1);
- sg_set_page(&src, src_page, PAGE_SIZE, 0);
- skcipher_request_set_crypt(req, &src, &dst, PAGE_SIZE,
- xts_tweak);
- if (rw == EXT4_DECRYPT)
- res = crypto_skcipher_decrypt(req);
- else
- res = crypto_skcipher_encrypt(req);
- if (res == -EINPROGRESS || res == -EBUSY) {
- wait_for_completion(&ecr.completion);
- res = ecr.res;
- }
- skcipher_request_free(req);
- if (res) {
- printk_ratelimited(
- KERN_ERR
- "%s: crypto_skcipher_encrypt() returned %d\n",
- __func__, res);
- return res;
- }
- return 0;
-}
-
-static struct page *alloc_bounce_page(struct ext4_crypto_ctx *ctx,
- gfp_t gfp_flags)
-{
- ctx->w.bounce_page = mempool_alloc(ext4_bounce_page_pool, gfp_flags);
- if (ctx->w.bounce_page == NULL)
- return ERR_PTR(-ENOMEM);
- ctx->flags |= EXT4_WRITE_PATH_FL;
- return ctx->w.bounce_page;
-}
-
-/**
- * ext4_encrypt() - Encrypts a page
- * @inode: The inode for which the encryption should take place
- * @plaintext_page: The page to encrypt. Must be locked.
- *
- * Allocates a ciphertext page and encrypts plaintext_page into it using the ctx
- * encryption context.
- *
- * Called on the page write path. The caller must call
- * ext4_restore_control_page() on the returned ciphertext page to
- * release the bounce buffer and the encryption context.
- *
- * Return: An allocated page with the encrypted content on success. Else, an
- * error value or NULL.
- */
-struct page *ext4_encrypt(struct inode *inode,
- struct page *plaintext_page,
- gfp_t gfp_flags)
-{
- struct ext4_crypto_ctx *ctx;
- struct page *ciphertext_page = NULL;
- int err;
-
- BUG_ON(!PageLocked(plaintext_page));
-
- ctx = ext4_get_crypto_ctx(inode, gfp_flags);
- if (IS_ERR(ctx))
- return (struct page *) ctx;
-
- /* The encryption operation will require a bounce page. */
- ciphertext_page = alloc_bounce_page(ctx, gfp_flags);
- if (IS_ERR(ciphertext_page))
- goto errout;
- ctx->w.control_page = plaintext_page;
- err = ext4_page_crypto(inode, EXT4_ENCRYPT, plaintext_page->index,
- plaintext_page, ciphertext_page, gfp_flags);
- if (err) {
- ciphertext_page = ERR_PTR(err);
- errout:
- ext4_release_crypto_ctx(ctx);
- return ciphertext_page;
- }
- SetPagePrivate(ciphertext_page);
- set_page_private(ciphertext_page, (unsigned long)ctx);
- lock_page(ciphertext_page);
- return ciphertext_page;
-}
-
-/**
- * ext4_decrypt() - Decrypts a page in-place
- * @ctx: The encryption context.
- * @page: The page to decrypt. Must be locked.
- *
- * Decrypts page in-place using the ctx encryption context.
- *
- * Called from the read completion callback.
- *
- * Return: Zero on success, non-zero otherwise.
- */
-int ext4_decrypt(struct page *page)
-{
- BUG_ON(!PageLocked(page));
-
- return ext4_page_crypto(page->mapping->host, EXT4_DECRYPT,
- page->index, page, page, GFP_NOFS);
-}
-
-int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
- ext4_fsblk_t pblk, ext4_lblk_t len)
-{
- struct ext4_crypto_ctx *ctx;
- struct page *ciphertext_page = NULL;
- struct bio *bio;
- int ret, err = 0;
-
-#if 0
- ext4_msg(inode->i_sb, KERN_CRIT,
- "ext4_encrypted_zeroout ino %lu lblk %u len %u",
- (unsigned long) inode->i_ino, lblk, len);
-#endif
-
- BUG_ON(inode->i_sb->s_blocksize != PAGE_SIZE);
-
- ctx = ext4_get_crypto_ctx(inode, GFP_NOFS);
- if (IS_ERR(ctx))
- return PTR_ERR(ctx);
-
- ciphertext_page = alloc_bounce_page(ctx, GFP_NOWAIT);
- if (IS_ERR(ciphertext_page)) {
- err = PTR_ERR(ciphertext_page);
- goto errout;
- }
-
- while (len--) {
- err = ext4_page_crypto(inode, EXT4_ENCRYPT, lblk,
- ZERO_PAGE(0), ciphertext_page,
- GFP_NOFS);
- if (err)
- goto errout;
-
- bio = bio_alloc(GFP_NOWAIT, 1);
- if (!bio) {
- err = -ENOMEM;
- goto errout;
- }
- bio->bi_bdev = inode->i_sb->s_bdev;
- bio->bi_iter.bi_sector =
- pblk << (inode->i_sb->s_blocksize_bits - 9);
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
- ret = bio_add_page(bio, ciphertext_page,
- inode->i_sb->s_blocksize, 0);
- if (ret != inode->i_sb->s_blocksize) {
- /* should never happen! */
- ext4_msg(inode->i_sb, KERN_ERR,
- "bio_add_page failed: %d", ret);
- WARN_ON(1);
- bio_put(bio);
- err = -EIO;
- goto errout;
- }
- err = submit_bio_wait(bio);
- if ((err == 0) && bio->bi_error)
- err = -EIO;
- bio_put(bio);
- if (err)
- goto errout;
- lblk++; pblk++;
- }
- err = 0;
-errout:
- ext4_release_crypto_ctx(ctx);
- return err;
-}
-
-bool ext4_valid_contents_enc_mode(uint32_t mode)
-{
- return (mode == EXT4_ENCRYPTION_MODE_AES_256_XTS);
-}
-
-/**
- * ext4_validate_encryption_key_size() - Validate the encryption key size
- * @mode: The key mode.
- * @size: The key size to validate.
- *
- * Return: The validated key size for @mode. Zero if invalid.
- */
-uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size)
-{
- if (size == ext4_encryption_key_size(mode))
- return size;
- return 0;
-}
-
-/*
- * Validate dentries for encrypted directories to make sure we aren't
- * potentially caching stale data after a key has been added or
- * removed.
- */
-static int ext4_d_revalidate(struct dentry *dentry, unsigned int flags)
-{
- struct dentry *dir;
- struct ext4_crypt_info *ci;
- int dir_has_key, cached_with_key;
-
- if (flags & LOOKUP_RCU)
- return -ECHILD;
-
- dir = dget_parent(dentry);
- if (!ext4_encrypted_inode(d_inode(dir))) {
- dput(dir);
- return 0;
- }
- ci = EXT4_I(d_inode(dir))->i_crypt_info;
- if (ci && ci->ci_keyring_key &&
- (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
- (1 << KEY_FLAG_REVOKED) |
- (1 << KEY_FLAG_DEAD))))
- ci = NULL;
-
- /* this should eventually be an flag in d_flags */
- cached_with_key = dentry->d_fsdata != NULL;
- dir_has_key = (ci != NULL);
- dput(dir);
-
- /*
- * If the dentry was cached without the key, and it is a
- * negative dentry, it might be a valid name. We can't check
- * if the key has since been made available due to locking
- * reasons, so we fail the validation so ext4_lookup() can do
- * this check.
- *
- * We also fail the validation if the dentry was created with
- * the key present, but we no longer have the key, or vice versa.
- */
- if ((!cached_with_key && d_is_negative(dentry)) ||
- (!cached_with_key && dir_has_key) ||
- (cached_with_key && !dir_has_key)) {
-#if 0 /* Revalidation debug */
- char buf[80];
- char *cp = simple_dname(dentry, buf, sizeof(buf));
-
- if (IS_ERR(cp))
- cp = (char *) "???";
- pr_err("revalidate: %s %p %d %d %d\n", cp, dentry->d_fsdata,
- cached_with_key, d_is_negative(dentry),
- dir_has_key);
-#endif
- return 0;
- }
- return 1;
-}
-
-const struct dentry_operations ext4_encrypted_d_ops = {
- .d_revalidate = ext4_d_revalidate,
-};
+++ /dev/null
-/*
- * linux/fs/ext4/crypto_fname.c
- *
- * Copyright (C) 2015, Google, Inc.
- *
- * This contains functions for filename crypto management in ext4
- *
- * Written by Uday Savagaonkar, 2014.
- *
- * This has not yet undergone a rigorous security audit.
- *
- */
-
-#include <crypto/skcipher.h>
-#include <keys/encrypted-type.h>
-#include <keys/user-type.h>
-#include <linux/gfp.h>
-#include <linux/kernel.h>
-#include <linux/key.h>
-#include <linux/list.h>
-#include <linux/mempool.h>
-#include <linux/random.h>
-#include <linux/scatterlist.h>
-#include <linux/spinlock_types.h>
-
-#include "ext4.h"
-#include "ext4_crypto.h"
-#include "xattr.h"
-
-/**
- * ext4_dir_crypt_complete() -
- */
-static void ext4_dir_crypt_complete(struct crypto_async_request *req, int res)
-{
- struct ext4_completion_result *ecr = req->data;
-
- if (res == -EINPROGRESS)
- return;
- ecr->res = res;
- complete(&ecr->completion);
-}
-
-bool ext4_valid_filenames_enc_mode(uint32_t mode)
-{
- return (mode == EXT4_ENCRYPTION_MODE_AES_256_CTS);
-}
-
-static unsigned max_name_len(struct inode *inode)
-{
- return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
- EXT4_NAME_LEN;
-}
-
-/**
- * ext4_fname_encrypt() -
- *
- * This function encrypts the input filename, and returns the length of the
- * ciphertext. Errors are returned as negative numbers. We trust the caller to
- * allocate sufficient memory to oname string.
- */
-static int ext4_fname_encrypt(struct inode *inode,
- const struct qstr *iname,
- struct ext4_str *oname)
-{
- u32 ciphertext_len;
- struct skcipher_request *req = NULL;
- DECLARE_EXT4_COMPLETION_RESULT(ecr);
- struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
- struct crypto_skcipher *tfm = ci->ci_ctfm;
- int res = 0;
- char iv[EXT4_CRYPTO_BLOCK_SIZE];
- struct scatterlist src_sg, dst_sg;
- int padding = 4 << (ci->ci_flags & EXT4_POLICY_FLAGS_PAD_MASK);
- char *workbuf, buf[32], *alloc_buf = NULL;
- unsigned lim = max_name_len(inode);
-
- if (iname->len <= 0 || iname->len > lim)
- return -EIO;
-
- ciphertext_len = (iname->len < EXT4_CRYPTO_BLOCK_SIZE) ?
- EXT4_CRYPTO_BLOCK_SIZE : iname->len;
- ciphertext_len = ext4_fname_crypto_round_up(ciphertext_len, padding);
- ciphertext_len = (ciphertext_len > lim)
- ? lim : ciphertext_len;
-
- if (ciphertext_len <= sizeof(buf)) {
- workbuf = buf;
- } else {
- alloc_buf = kmalloc(ciphertext_len, GFP_NOFS);
- if (!alloc_buf)
- return -ENOMEM;
- workbuf = alloc_buf;
- }
-
- /* Allocate request */
- req = skcipher_request_alloc(tfm, GFP_NOFS);
- if (!req) {
- printk_ratelimited(
- KERN_ERR "%s: crypto_request_alloc() failed\n", __func__);
- kfree(alloc_buf);
- return -ENOMEM;
- }
- skcipher_request_set_callback(req,
- CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
- ext4_dir_crypt_complete, &ecr);
-
- /* Copy the input */
- memcpy(workbuf, iname->name, iname->len);
- if (iname->len < ciphertext_len)
- memset(workbuf + iname->len, 0, ciphertext_len - iname->len);
-
- /* Initialize IV */
- memset(iv, 0, EXT4_CRYPTO_BLOCK_SIZE);
-
- /* Create encryption request */
- sg_init_one(&src_sg, workbuf, ciphertext_len);
- sg_init_one(&dst_sg, oname->name, ciphertext_len);
- skcipher_request_set_crypt(req, &src_sg, &dst_sg, ciphertext_len, iv);
- res = crypto_skcipher_encrypt(req);
- if (res == -EINPROGRESS || res == -EBUSY) {
- wait_for_completion(&ecr.completion);
- res = ecr.res;
- }
- kfree(alloc_buf);
- skcipher_request_free(req);
- if (res < 0) {
- printk_ratelimited(
- KERN_ERR "%s: Error (error code %d)\n", __func__, res);
- }
- oname->len = ciphertext_len;
- return res;
-}
-
-/*
- * ext4_fname_decrypt()
- * This function decrypts the input filename, and returns
- * the length of the plaintext.
- * Errors are returned as negative numbers.
- * We trust the caller to allocate sufficient memory to oname string.
- */
-static int ext4_fname_decrypt(struct inode *inode,
- const struct ext4_str *iname,
- struct ext4_str *oname)
-{
- struct ext4_str tmp_in[2], tmp_out[1];
- struct skcipher_request *req = NULL;
- DECLARE_EXT4_COMPLETION_RESULT(ecr);
- struct scatterlist src_sg, dst_sg;
- struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
- struct crypto_skcipher *tfm = ci->ci_ctfm;
- int res = 0;
- char iv[EXT4_CRYPTO_BLOCK_SIZE];
- unsigned lim = max_name_len(inode);
-
- if (iname->len <= 0 || iname->len > lim)
- return -EIO;
-
- tmp_in[0].name = iname->name;
- tmp_in[0].len = iname->len;
- tmp_out[0].name = oname->name;
-
- /* Allocate request */
- req = skcipher_request_alloc(tfm, GFP_NOFS);
- if (!req) {
- printk_ratelimited(
- KERN_ERR "%s: crypto_request_alloc() failed\n", __func__);
- return -ENOMEM;
- }
- skcipher_request_set_callback(req,
- CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
- ext4_dir_crypt_complete, &ecr);
-
- /* Initialize IV */
- memset(iv, 0, EXT4_CRYPTO_BLOCK_SIZE);
-
- /* Create encryption request */
- sg_init_one(&src_sg, iname->name, iname->len);
- sg_init_one(&dst_sg, oname->name, oname->len);
- skcipher_request_set_crypt(req, &src_sg, &dst_sg, iname->len, iv);
- res = crypto_skcipher_decrypt(req);
- if (res == -EINPROGRESS || res == -EBUSY) {
- wait_for_completion(&ecr.completion);
- res = ecr.res;
- }
- skcipher_request_free(req);
- if (res < 0) {
- printk_ratelimited(
- KERN_ERR "%s: Error in ext4_fname_encrypt (error code %d)\n",
- __func__, res);
- return res;
- }
-
- oname->len = strnlen(oname->name, iname->len);
- return oname->len;
-}
-
-static const char *lookup_table =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
-
-/**
- * ext4_fname_encode_digest() -
- *
- * Encodes the input digest using characters from the set [a-zA-Z0-9_+].
- * The encoded string is roughly 4/3 times the size of the input string.
- */
-static int digest_encode(const char *src, int len, char *dst)
-{
- int i = 0, bits = 0, ac = 0;
- char *cp = dst;
-
- while (i < len) {
- ac += (((unsigned char) src[i]) << bits);
- bits += 8;
- do {
- *cp++ = lookup_table[ac & 0x3f];
- ac >>= 6;
- bits -= 6;
- } while (bits >= 6);
- i++;
- }
- if (bits)
- *cp++ = lookup_table[ac & 0x3f];
- return cp - dst;
-}
-
-static int digest_decode(const char *src, int len, char *dst)
-{
- int i = 0, bits = 0, ac = 0;
- const char *p;
- char *cp = dst;
-
- while (i < len) {
- p = strchr(lookup_table, src[i]);
- if (p == NULL || src[i] == 0)
- return -2;
- ac += (p - lookup_table) << bits;
- bits += 6;
- if (bits >= 8) {
- *cp++ = ac & 0xff;
- ac >>= 8;
- bits -= 8;
- }
- i++;
- }
- if (ac)
- return -1;
- return cp - dst;
-}
-
-/**
- * ext4_fname_crypto_round_up() -
- *
- * Return: The next multiple of block size
- */
-u32 ext4_fname_crypto_round_up(u32 size, u32 blksize)
-{
- return ((size+blksize-1)/blksize)*blksize;
-}
-
-unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen)
-{
- struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
- int padding = 32;
-
- if (ci)
- padding = 4 << (ci->ci_flags & EXT4_POLICY_FLAGS_PAD_MASK);
- if (ilen < EXT4_CRYPTO_BLOCK_SIZE)
- ilen = EXT4_CRYPTO_BLOCK_SIZE;
- return ext4_fname_crypto_round_up(ilen, padding);
-}
-
-/*
- * ext4_fname_crypto_alloc_buffer() -
- *
- * Allocates an output buffer that is sufficient for the crypto operation
- * specified by the context and the direction.
- */
-int ext4_fname_crypto_alloc_buffer(struct inode *inode,
- u32 ilen, struct ext4_str *crypto_str)
-{
- unsigned int olen = ext4_fname_encrypted_size(inode, ilen);
-
- crypto_str->len = olen;
- if (olen < EXT4_FNAME_CRYPTO_DIGEST_SIZE*2)
- olen = EXT4_FNAME_CRYPTO_DIGEST_SIZE*2;
- /* Allocated buffer can hold one more character to null-terminate the
- * string */
- crypto_str->name = kmalloc(olen+1, GFP_NOFS);
- if (!(crypto_str->name))
- return -ENOMEM;
- return 0;
-}
-
-/**
- * ext4_fname_crypto_free_buffer() -
- *
- * Frees the buffer allocated for crypto operation.
- */
-void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str)
-{
- if (!crypto_str)
- return;
- kfree(crypto_str->name);
- crypto_str->name = NULL;
-}
-
-/**
- * ext4_fname_disk_to_usr() - converts a filename from disk space to user space
- */
-int _ext4_fname_disk_to_usr(struct inode *inode,
- struct dx_hash_info *hinfo,
- const struct ext4_str *iname,
- struct ext4_str *oname)
-{
- char buf[24];
- int ret;
-
- if (iname->len < 3) {
- /*Check for . and .. */
- if (iname->name[0] == '.' && iname->name[iname->len-1] == '.') {
- oname->name[0] = '.';
- oname->name[iname->len-1] = '.';
- oname->len = iname->len;
- return oname->len;
- }
- }
- if (iname->len < EXT4_CRYPTO_BLOCK_SIZE) {
- EXT4_ERROR_INODE(inode, "encrypted inode too small");
- return -EUCLEAN;
- }
- if (EXT4_I(inode)->i_crypt_info)
- return ext4_fname_decrypt(inode, iname, oname);
-
- if (iname->len <= EXT4_FNAME_CRYPTO_DIGEST_SIZE) {
- ret = digest_encode(iname->name, iname->len, oname->name);
- oname->len = ret;
- return ret;
- }
- if (hinfo) {
- memcpy(buf, &hinfo->hash, 4);
- memcpy(buf+4, &hinfo->minor_hash, 4);
- } else
- memset(buf, 0, 8);
- memcpy(buf + 8, iname->name + iname->len - 16, 16);
- oname->name[0] = '_';
- ret = digest_encode(buf, 24, oname->name+1);
- oname->len = ret + 1;
- return ret + 1;
-}
-
-int ext4_fname_disk_to_usr(struct inode *inode,
- struct dx_hash_info *hinfo,
- const struct ext4_dir_entry_2 *de,
- struct ext4_str *oname)
-{
- struct ext4_str iname = {.name = (unsigned char *) de->name,
- .len = de->name_len };
-
- return _ext4_fname_disk_to_usr(inode, hinfo, &iname, oname);
-}
-
-
-/**
- * ext4_fname_usr_to_disk() - converts a filename from user space to disk space
- */
-int ext4_fname_usr_to_disk(struct inode *inode,
- const struct qstr *iname,
- struct ext4_str *oname)
-{
- int res;
- struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
-
- if (iname->len < 3) {
- /*Check for . and .. */
- if (iname->name[0] == '.' &&
- iname->name[iname->len-1] == '.') {
- oname->name[0] = '.';
- oname->name[iname->len-1] = '.';
- oname->len = iname->len;
- return oname->len;
- }
- }
- if (ci) {
- res = ext4_fname_encrypt(inode, iname, oname);
- return res;
- }
- /* Without a proper key, a user is not allowed to modify the filenames
- * in a directory. Consequently, a user space name cannot be mapped to
- * a disk-space name */
- return -EACCES;
-}
-
-int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
- int lookup, struct ext4_filename *fname)
-{
- struct ext4_crypt_info *ci;
- int ret = 0, bigname = 0;
-
- memset(fname, 0, sizeof(struct ext4_filename));
- fname->usr_fname = iname;
-
- if (!ext4_encrypted_inode(dir) ||
- ((iname->name[0] == '.') &&
- ((iname->len == 1) ||
- ((iname->name[1] == '.') && (iname->len == 2))))) {
- fname->disk_name.name = (unsigned char *) iname->name;
- fname->disk_name.len = iname->len;
- return 0;
- }
- ret = ext4_get_encryption_info(dir);
- if (ret)
- return ret;
- ci = EXT4_I(dir)->i_crypt_info;
- if (ci) {
- ret = ext4_fname_crypto_alloc_buffer(dir, iname->len,
- &fname->crypto_buf);
- if (ret < 0)
- return ret;
- ret = ext4_fname_encrypt(dir, iname, &fname->crypto_buf);
- if (ret < 0)
- goto errout;
- fname->disk_name.name = fname->crypto_buf.name;
- fname->disk_name.len = fname->crypto_buf.len;
- return 0;
- }
- if (!lookup)
- return -EACCES;
-
- /* We don't have the key and we are doing a lookup; decode the
- * user-supplied name
- */
- if (iname->name[0] == '_')
- bigname = 1;
- if ((bigname && (iname->len != 33)) ||
- (!bigname && (iname->len > 43)))
- return -ENOENT;
-
- fname->crypto_buf.name = kmalloc(32, GFP_KERNEL);
- if (fname->crypto_buf.name == NULL)
- return -ENOMEM;
- ret = digest_decode(iname->name + bigname, iname->len - bigname,
- fname->crypto_buf.name);
- if (ret < 0) {
- ret = -ENOENT;
- goto errout;
- }
- fname->crypto_buf.len = ret;
- if (bigname) {
- memcpy(&fname->hinfo.hash, fname->crypto_buf.name, 4);
- memcpy(&fname->hinfo.minor_hash, fname->crypto_buf.name + 4, 4);
- } else {
- fname->disk_name.name = fname->crypto_buf.name;
- fname->disk_name.len = fname->crypto_buf.len;
- }
- return 0;
-errout:
- kfree(fname->crypto_buf.name);
- fname->crypto_buf.name = NULL;
- return ret;
-}
-
-void ext4_fname_free_filename(struct ext4_filename *fname)
-{
- kfree(fname->crypto_buf.name);
- fname->crypto_buf.name = NULL;
- fname->usr_fname = NULL;
- fname->disk_name.name = NULL;
-}
+++ /dev/null
-/*
- * linux/fs/ext4/crypto_key.c
- *
- * Copyright (C) 2015, Google, Inc.
- *
- * This contains encryption key functions for ext4
- *
- * Written by Michael Halcrow, Ildar Muslukhov, and Uday Savagaonkar, 2015.
- */
-
-#include <crypto/skcipher.h>
-#include <keys/encrypted-type.h>
-#include <keys/user-type.h>
-#include <linux/random.h>
-#include <linux/scatterlist.h>
-#include <uapi/linux/keyctl.h>
-
-#include "ext4.h"
-#include "xattr.h"
-
-static void derive_crypt_complete(struct crypto_async_request *req, int rc)
-{
- struct ext4_completion_result *ecr = req->data;
-
- if (rc == -EINPROGRESS)
- return;
-
- ecr->res = rc;
- complete(&ecr->completion);
-}
-
-/**
- * ext4_derive_key_aes() - Derive a key using AES-128-ECB
- * @deriving_key: Encryption key used for derivation.
- * @source_key: Source key to which to apply derivation.
- * @derived_key: Derived key.
- *
- * Return: Zero on success; non-zero otherwise.
- */
-static int ext4_derive_key_aes(char deriving_key[EXT4_AES_128_ECB_KEY_SIZE],
- char source_key[EXT4_AES_256_XTS_KEY_SIZE],
- char derived_key[EXT4_AES_256_XTS_KEY_SIZE])
-{
- int res = 0;
- struct skcipher_request *req = NULL;
- DECLARE_EXT4_COMPLETION_RESULT(ecr);
- struct scatterlist src_sg, dst_sg;
- struct crypto_skcipher *tfm = crypto_alloc_skcipher("ecb(aes)", 0, 0);
-
- if (IS_ERR(tfm)) {
- res = PTR_ERR(tfm);
- tfm = NULL;
- goto out;
- }
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);
- req = skcipher_request_alloc(tfm, GFP_NOFS);
- if (!req) {
- res = -ENOMEM;
- goto out;
- }
- skcipher_request_set_callback(req,
- CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
- derive_crypt_complete, &ecr);
- res = crypto_skcipher_setkey(tfm, deriving_key,
- EXT4_AES_128_ECB_KEY_SIZE);
- if (res < 0)
- goto out;
- sg_init_one(&src_sg, source_key, EXT4_AES_256_XTS_KEY_SIZE);
- sg_init_one(&dst_sg, derived_key, EXT4_AES_256_XTS_KEY_SIZE);
- skcipher_request_set_crypt(req, &src_sg, &dst_sg,
- EXT4_AES_256_XTS_KEY_SIZE, NULL);
- res = crypto_skcipher_encrypt(req);
- if (res == -EINPROGRESS || res == -EBUSY) {
- wait_for_completion(&ecr.completion);
- res = ecr.res;
- }
-
-out:
- skcipher_request_free(req);
- crypto_free_skcipher(tfm);
- return res;
-}
-
-void ext4_free_crypt_info(struct ext4_crypt_info *ci)
-{
- if (!ci)
- return;
-
- if (ci->ci_keyring_key)
- key_put(ci->ci_keyring_key);
- crypto_free_skcipher(ci->ci_ctfm);
- kmem_cache_free(ext4_crypt_info_cachep, ci);
-}
-
-void ext4_free_encryption_info(struct inode *inode,
- struct ext4_crypt_info *ci)
-{
- struct ext4_inode_info *ei = EXT4_I(inode);
- struct ext4_crypt_info *prev;
-
- if (ci == NULL)
- ci = ACCESS_ONCE(ei->i_crypt_info);
- if (ci == NULL)
- return;
- prev = cmpxchg(&ei->i_crypt_info, ci, NULL);
- if (prev != ci)
- return;
-
- ext4_free_crypt_info(ci);
-}
-
-int _ext4_get_encryption_info(struct inode *inode)
-{
- struct ext4_inode_info *ei = EXT4_I(inode);
- struct ext4_crypt_info *crypt_info;
- char full_key_descriptor[EXT4_KEY_DESC_PREFIX_SIZE +
- (EXT4_KEY_DESCRIPTOR_SIZE * 2) + 1];
- struct key *keyring_key = NULL;
- struct ext4_encryption_key *master_key;
- struct ext4_encryption_context ctx;
- const struct user_key_payload *ukp;
- struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
- struct crypto_skcipher *ctfm;
- const char *cipher_str;
- char raw_key[EXT4_MAX_KEY_SIZE];
- char mode;
- int res;
-
- if (!ext4_read_workqueue) {
- res = ext4_init_crypto();
- if (res)
- return res;
- }
-
-retry:
- crypt_info = ACCESS_ONCE(ei->i_crypt_info);
- if (crypt_info) {
- if (!crypt_info->ci_keyring_key ||
- key_validate(crypt_info->ci_keyring_key) == 0)
- return 0;
- ext4_free_encryption_info(inode, crypt_info);
- goto retry;
- }
-
- res = ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
- EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
- &ctx, sizeof(ctx));
- if (res < 0) {
- if (!DUMMY_ENCRYPTION_ENABLED(sbi))
- return res;
- ctx.contents_encryption_mode = EXT4_ENCRYPTION_MODE_AES_256_XTS;
- ctx.filenames_encryption_mode =
- EXT4_ENCRYPTION_MODE_AES_256_CTS;
- ctx.flags = 0;
- } else if (res != sizeof(ctx))
- return -EINVAL;
- res = 0;
-
- crypt_info = kmem_cache_alloc(ext4_crypt_info_cachep, GFP_KERNEL);
- if (!crypt_info)
- return -ENOMEM;
-
- crypt_info->ci_flags = ctx.flags;
- crypt_info->ci_data_mode = ctx.contents_encryption_mode;
- crypt_info->ci_filename_mode = ctx.filenames_encryption_mode;
- crypt_info->ci_ctfm = NULL;
- crypt_info->ci_keyring_key = NULL;
- memcpy(crypt_info->ci_master_key, ctx.master_key_descriptor,
- sizeof(crypt_info->ci_master_key));
- if (S_ISREG(inode->i_mode))
- mode = crypt_info->ci_data_mode;
- else if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
- mode = crypt_info->ci_filename_mode;
- else
- BUG();
- switch (mode) {
- case EXT4_ENCRYPTION_MODE_AES_256_XTS:
- cipher_str = "xts(aes)";
- break;
- case EXT4_ENCRYPTION_MODE_AES_256_CTS:
- cipher_str = "cts(cbc(aes))";
- break;
- default:
- printk_once(KERN_WARNING
- "ext4: unsupported key mode %d (ino %u)\n",
- mode, (unsigned) inode->i_ino);
- res = -ENOKEY;
- goto out;
- }
- if (DUMMY_ENCRYPTION_ENABLED(sbi)) {
- memset(raw_key, 0x42, EXT4_AES_256_XTS_KEY_SIZE);
- goto got_key;
- }
- memcpy(full_key_descriptor, EXT4_KEY_DESC_PREFIX,
- EXT4_KEY_DESC_PREFIX_SIZE);
- sprintf(full_key_descriptor + EXT4_KEY_DESC_PREFIX_SIZE,
- "%*phN", EXT4_KEY_DESCRIPTOR_SIZE,
- ctx.master_key_descriptor);
- full_key_descriptor[EXT4_KEY_DESC_PREFIX_SIZE +
- (2 * EXT4_KEY_DESCRIPTOR_SIZE)] = '\0';
- keyring_key = request_key(&key_type_logon, full_key_descriptor, NULL);
- if (IS_ERR(keyring_key)) {
- res = PTR_ERR(keyring_key);
- keyring_key = NULL;
- goto out;
- }
- crypt_info->ci_keyring_key = keyring_key;
- if (keyring_key->type != &key_type_logon) {
- printk_once(KERN_WARNING
- "ext4: key type must be logon\n");
- res = -ENOKEY;
- goto out;
- }
- down_read(&keyring_key->sem);
- ukp = user_key_payload(keyring_key);
- if (ukp->datalen != sizeof(struct ext4_encryption_key)) {
- res = -EINVAL;
- up_read(&keyring_key->sem);
- goto out;
- }
- master_key = (struct ext4_encryption_key *)ukp->data;
- BUILD_BUG_ON(EXT4_AES_128_ECB_KEY_SIZE !=
- EXT4_KEY_DERIVATION_NONCE_SIZE);
- if (master_key->size != EXT4_AES_256_XTS_KEY_SIZE) {
- printk_once(KERN_WARNING
- "ext4: key size incorrect: %d\n",
- master_key->size);
- res = -ENOKEY;
- up_read(&keyring_key->sem);
- goto out;
- }
- res = ext4_derive_key_aes(ctx.nonce, master_key->raw,
- raw_key);
- up_read(&keyring_key->sem);
- if (res)
- goto out;
-got_key:
- ctfm = crypto_alloc_skcipher(cipher_str, 0, 0);
- if (!ctfm || IS_ERR(ctfm)) {
- res = ctfm ? PTR_ERR(ctfm) : -ENOMEM;
- printk(KERN_DEBUG
- "%s: error %d (inode %u) allocating crypto tfm\n",
- __func__, res, (unsigned) inode->i_ino);
- goto out;
- }
- crypt_info->ci_ctfm = ctfm;
- crypto_skcipher_clear_flags(ctfm, ~0);
- crypto_tfm_set_flags(crypto_skcipher_tfm(ctfm),
- CRYPTO_TFM_REQ_WEAK_KEY);
- res = crypto_skcipher_setkey(ctfm, raw_key,
- ext4_encryption_key_size(mode));
- if (res)
- goto out;
- memzero_explicit(raw_key, sizeof(raw_key));
- if (cmpxchg(&ei->i_crypt_info, NULL, crypt_info) != NULL) {
- ext4_free_crypt_info(crypt_info);
- goto retry;
- }
- return 0;
-
-out:
- if (res == -ENOKEY)
- res = 0;
- ext4_free_crypt_info(crypt_info);
- memzero_explicit(raw_key, sizeof(raw_key));
- return res;
-}
-
-int ext4_has_encryption_key(struct inode *inode)
-{
- struct ext4_inode_info *ei = EXT4_I(inode);
-
- return (ei->i_crypt_info != NULL);
-}
+++ /dev/null
-/*
- * linux/fs/ext4/crypto_policy.c
- *
- * Copyright (C) 2015, Google, Inc.
- *
- * This contains encryption policy functions for ext4
- *
- * Written by Michael Halcrow, 2015.
- */
-
-#include <linux/random.h>
-#include <linux/string.h>
-#include <linux/types.h>
-
-#include "ext4_jbd2.h"
-#include "ext4.h"
-#include "xattr.h"
-
-static int ext4_inode_has_encryption_context(struct inode *inode)
-{
- int res = ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
- EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, NULL, 0);
- return (res > 0);
-}
-
-/*
- * check whether the policy is consistent with the encryption context
- * for the inode
- */
-static int ext4_is_encryption_context_consistent_with_policy(
- struct inode *inode, const struct ext4_encryption_policy *policy)
-{
- struct ext4_encryption_context ctx;
- int res = ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
- EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, &ctx,
- sizeof(ctx));
- if (res != sizeof(ctx))
- return 0;
- return (memcmp(ctx.master_key_descriptor, policy->master_key_descriptor,
- EXT4_KEY_DESCRIPTOR_SIZE) == 0 &&
- (ctx.flags ==
- policy->flags) &&
- (ctx.contents_encryption_mode ==
- policy->contents_encryption_mode) &&
- (ctx.filenames_encryption_mode ==
- policy->filenames_encryption_mode));
-}
-
-static int ext4_create_encryption_context_from_policy(
- struct inode *inode, const struct ext4_encryption_policy *policy)
-{
- struct ext4_encryption_context ctx;
- handle_t *handle;
- int res, res2;
-
- res = ext4_convert_inline_data(inode);
- if (res)
- return res;
-
- ctx.format = EXT4_ENCRYPTION_CONTEXT_FORMAT_V1;
- memcpy(ctx.master_key_descriptor, policy->master_key_descriptor,
- EXT4_KEY_DESCRIPTOR_SIZE);
- if (!ext4_valid_contents_enc_mode(policy->contents_encryption_mode)) {
- printk(KERN_WARNING
- "%s: Invalid contents encryption mode %d\n", __func__,
- policy->contents_encryption_mode);
- return -EINVAL;
- }
- if (!ext4_valid_filenames_enc_mode(policy->filenames_encryption_mode)) {
- printk(KERN_WARNING
- "%s: Invalid filenames encryption mode %d\n", __func__,
- policy->filenames_encryption_mode);
- return -EINVAL;
- }
- if (policy->flags & ~EXT4_POLICY_FLAGS_VALID)
- return -EINVAL;
- ctx.contents_encryption_mode = policy->contents_encryption_mode;
- ctx.filenames_encryption_mode = policy->filenames_encryption_mode;
- ctx.flags = policy->flags;
- BUILD_BUG_ON(sizeof(ctx.nonce) != EXT4_KEY_DERIVATION_NONCE_SIZE);
- get_random_bytes(ctx.nonce, EXT4_KEY_DERIVATION_NONCE_SIZE);
-
- handle = ext4_journal_start(inode, EXT4_HT_MISC,
- ext4_jbd2_credits_xattr(inode));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
- res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
- EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, &ctx,
- sizeof(ctx), 0);
- if (!res) {
- ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
- res = ext4_mark_inode_dirty(handle, inode);
- if (res)
- EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
- }
- res2 = ext4_journal_stop(handle);
- if (!res)
- res = res2;
- return res;
-}
-
-int ext4_process_policy(const struct ext4_encryption_policy *policy,
- struct inode *inode)
-{
- if (policy->version != 0)
- return -EINVAL;
-
- if (!ext4_inode_has_encryption_context(inode)) {
- if (!S_ISDIR(inode->i_mode))
- return -EINVAL;
- if (!ext4_empty_dir(inode))
- return -ENOTEMPTY;
- return ext4_create_encryption_context_from_policy(inode,
- policy);
- }
-
- if (ext4_is_encryption_context_consistent_with_policy(inode, policy))
- return 0;
-
- printk(KERN_WARNING "%s: Policy inconsistent with encryption context\n",
- __func__);
- return -EINVAL;
-}
-
-int ext4_get_policy(struct inode *inode, struct ext4_encryption_policy *policy)
-{
- struct ext4_encryption_context ctx;
-
- int res = ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
- EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
- &ctx, sizeof(ctx));
- if (res != sizeof(ctx))
- return -ENOENT;
- if (ctx.format != EXT4_ENCRYPTION_CONTEXT_FORMAT_V1)
- return -EINVAL;
- policy->version = 0;
- policy->contents_encryption_mode = ctx.contents_encryption_mode;
- policy->filenames_encryption_mode = ctx.filenames_encryption_mode;
- policy->flags = ctx.flags;
- memcpy(&policy->master_key_descriptor, ctx.master_key_descriptor,
- EXT4_KEY_DESCRIPTOR_SIZE);
- return 0;
-}
-
-int ext4_is_child_context_consistent_with_parent(struct inode *parent,
- struct inode *child)
-{
- struct ext4_crypt_info *parent_ci, *child_ci;
- int res;
-
- if ((parent == NULL) || (child == NULL)) {
- pr_err("parent %p child %p\n", parent, child);
- WARN_ON(1); /* Should never happen */
- return 0;
- }
- /* no restrictions if the parent directory is not encrypted */
- if (!ext4_encrypted_inode(parent))
- return 1;
- /* if the child directory is not encrypted, this is always a problem */
- if (!ext4_encrypted_inode(child))
- return 0;
- res = ext4_get_encryption_info(parent);
- if (res)
- return 0;
- res = ext4_get_encryption_info(child);
- if (res)
- return 0;
- parent_ci = EXT4_I(parent)->i_crypt_info;
- child_ci = EXT4_I(child)->i_crypt_info;
- if (!parent_ci && !child_ci)
- return 1;
- if (!parent_ci || !child_ci)
- return 0;
-
- return (memcmp(parent_ci->ci_master_key,
- child_ci->ci_master_key,
- EXT4_KEY_DESCRIPTOR_SIZE) == 0 &&
- (parent_ci->ci_data_mode == child_ci->ci_data_mode) &&
- (parent_ci->ci_filename_mode == child_ci->ci_filename_mode) &&
- (parent_ci->ci_flags == child_ci->ci_flags));
-}
-
-/**
- * ext4_inherit_context() - Sets a child context from its parent
- * @parent: Parent inode from which the context is inherited.
- * @child: Child inode that inherits the context from @parent.
- *
- * Return: Zero on success, non-zero otherwise
- */
-int ext4_inherit_context(struct inode *parent, struct inode *child)
-{
- struct ext4_encryption_context ctx;
- struct ext4_crypt_info *ci;
- int res;
-
- res = ext4_get_encryption_info(parent);
- if (res < 0)
- return res;
- ci = EXT4_I(parent)->i_crypt_info;
- if (ci == NULL)
- return -ENOKEY;
-
- ctx.format = EXT4_ENCRYPTION_CONTEXT_FORMAT_V1;
- if (DUMMY_ENCRYPTION_ENABLED(EXT4_SB(parent->i_sb))) {
- ctx.contents_encryption_mode = EXT4_ENCRYPTION_MODE_AES_256_XTS;
- ctx.filenames_encryption_mode =
- EXT4_ENCRYPTION_MODE_AES_256_CTS;
- ctx.flags = 0;
- memset(ctx.master_key_descriptor, 0x42,
- EXT4_KEY_DESCRIPTOR_SIZE);
- res = 0;
- } else {
- ctx.contents_encryption_mode = ci->ci_data_mode;
- ctx.filenames_encryption_mode = ci->ci_filename_mode;
- ctx.flags = ci->ci_flags;
- memcpy(ctx.master_key_descriptor, ci->ci_master_key,
- EXT4_KEY_DESCRIPTOR_SIZE);
- }
- get_random_bytes(ctx.nonce, EXT4_KEY_DERIVATION_NONCE_SIZE);
- res = ext4_xattr_set(child, EXT4_XATTR_INDEX_ENCRYPTION,
- EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, &ctx,
- sizeof(ctx), 0);
- if (!res) {
- ext4_set_inode_flag(child, EXT4_INODE_ENCRYPT);
- ext4_clear_inode_state(child, EXT4_STATE_MAY_INLINE_DATA);
- res = ext4_get_encryption_info(child);
- }
- return res;
-}
struct super_block *sb = inode->i_sb;
struct buffer_head *bh = NULL;
int dir_has_error = 0;
- struct ext4_str fname_crypto_str = {.name = NULL, .len = 0};
+ struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
if (ext4_encrypted_inode(inode)) {
- err = ext4_get_encryption_info(inode);
+ err = fscrypt_get_encryption_info(inode);
if (err && err != -ENOKEY)
return err;
}
}
if (ext4_encrypted_inode(inode)) {
- err = ext4_fname_crypto_alloc_buffer(inode, EXT4_NAME_LEN,
- &fname_crypto_str);
+ err = fscrypt_fname_alloc_buffer(inode, EXT4_NAME_LEN, &fstr);
if (err < 0)
return err;
}
get_dtype(sb, de->file_type)))
goto done;
} else {
- int save_len = fname_crypto_str.len;
+ int save_len = fstr.len;
+ struct fscrypt_str de_name =
+ FSTR_INIT(de->name,
+ de->name_len);
/* Directory is encrypted */
- err = ext4_fname_disk_to_usr(inode,
- NULL, de, &fname_crypto_str);
- fname_crypto_str.len = save_len;
+ err = fscrypt_fname_disk_to_usr(inode,
+ 0, 0, &de_name, &fstr);
+ fstr.len = save_len;
if (err < 0)
goto errout;
if (!dir_emit(ctx,
- fname_crypto_str.name, err,
+ fstr.name, err,
le32_to_cpu(de->inode),
get_dtype(sb, de->file_type)))
goto done;
err = 0;
errout:
#ifdef CONFIG_EXT4_FS_ENCRYPTION
- ext4_fname_crypto_free_buffer(&fname_crypto_str);
+ fscrypt_fname_free_buffer(&fstr);
#endif
brelse(bh);
return err;
int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
__u32 minor_hash,
struct ext4_dir_entry_2 *dirent,
- struct ext4_str *ent_name)
+ struct fscrypt_str *ent_name)
{
struct rb_node **p, *parent = NULL;
struct fname *fname, *new_fn;
static int ext4_dir_open(struct inode * inode, struct file * filp)
{
if (ext4_encrypted_inode(inode))
- return ext4_get_encryption_info(inode) ? -EACCES : 0;
+ return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
return 0;
}
#include <linux/percpu_counter.h>
#include <linux/ratelimit.h>
#include <crypto/hash.h>
+#include <linux/fscrypto.h>
#include <linux/falloc.h>
#include <linux/percpu-rwsem.h>
#ifdef __KERNEL__
#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
-/* Encryption algorithms */
-#define EXT4_ENCRYPTION_MODE_INVALID 0
-#define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
-#define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
-#define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
-#define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
-
-#include "ext4_crypto.h"
-
/*
* ioctl commands
*/
#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
-#define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy)
-#define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
-#define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy)
+#define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
+#define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT
+#define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
#ifndef FS_IOC_FSGETXATTR
/* Until the uapi changes get merged for project quota... */
/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
__u32 i_csum_seed;
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
- /* Encryption params */
- struct ext4_crypt_info *i_crypt_info;
-#endif
kprojid_t i_projid;
};
/* Number of quota types we support */
#define EXT4_MAXQUOTAS 3
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
+#define EXT4_KEY_DESC_PREFIX "ext4:"
+#define EXT4_KEY_DESC_PREFIX_SIZE 5
+#endif
+
/*
* fourth extended-fs super-block data in memory
*/
unsigned short *s_mb_offsets;
unsigned int *s_mb_maxs;
unsigned int s_group_info_size;
+ unsigned int s_mb_free_pending;
/* tunables */
unsigned long s_stripe;
/* Barrier between changing inodes' journal flags and writepages ops. */
struct percpu_rw_semaphore s_journal_flag_rwsem;
+
+ /* Encryption support */
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
+ u8 key_prefix[EXT4_KEY_DESC_PREFIX_SIZE];
+ u8 key_prefix_size;
+#endif
};
static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
/*
* Returns true if the inode is inode is encrypted
*/
-static inline int ext4_encrypted_inode(struct inode *inode)
-{
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
- return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
-#else
- return 0;
-#endif
-}
-
#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
/*
struct ext4_filename {
const struct qstr *usr_fname;
- struct ext4_str disk_name;
+ struct fscrypt_str disk_name;
struct dx_hash_info hinfo;
#ifdef CONFIG_EXT4_FS_ENCRYPTION
- struct ext4_str crypto_buf;
+ struct fscrypt_str crypto_buf;
#endif
};
struct ext4_group_desc *gdp);
ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
-/* crypto_policy.c */
-int ext4_is_child_context_consistent_with_parent(struct inode *parent,
- struct inode *child);
-int ext4_inherit_context(struct inode *parent, struct inode *child);
-void ext4_to_hex(char *dst, char *src, size_t src_size);
-int ext4_process_policy(const struct ext4_encryption_policy *policy,
- struct inode *inode);
-int ext4_get_policy(struct inode *inode,
- struct ext4_encryption_policy *policy);
-
-/* crypto.c */
-extern struct kmem_cache *ext4_crypt_info_cachep;
-bool ext4_valid_contents_enc_mode(uint32_t mode);
-uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
-extern struct workqueue_struct *ext4_read_workqueue;
-struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode,
- gfp_t gfp_flags);
-void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
-void ext4_restore_control_page(struct page *data_page);
-struct page *ext4_encrypt(struct inode *inode,
- struct page *plaintext_page,
- gfp_t gfp_flags);
-int ext4_decrypt(struct page *page);
-int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
- ext4_fsblk_t pblk, ext4_lblk_t len);
-extern const struct dentry_operations ext4_encrypted_d_ops;
-
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
-int ext4_init_crypto(void);
-void ext4_exit_crypto(void);
static inline int ext4_sb_has_crypto(struct super_block *sb)
{
return ext4_has_feature_encrypt(sb);
}
-#else
-static inline int ext4_init_crypto(void) { return 0; }
-static inline void ext4_exit_crypto(void) { }
-static inline int ext4_sb_has_crypto(struct super_block *sb)
+
+static inline bool ext4_encrypted_inode(struct inode *inode)
{
- return 0;
+ return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
}
-#endif
-/* crypto_fname.c */
-bool ext4_valid_filenames_enc_mode(uint32_t mode);
-u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
-unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
-int ext4_fname_crypto_alloc_buffer(struct inode *inode,
- u32 ilen, struct ext4_str *crypto_str);
-int _ext4_fname_disk_to_usr(struct inode *inode,
- struct dx_hash_info *hinfo,
- const struct ext4_str *iname,
- struct ext4_str *oname);
-int ext4_fname_disk_to_usr(struct inode *inode,
- struct dx_hash_info *hinfo,
- const struct ext4_dir_entry_2 *de,
- struct ext4_str *oname);
-int ext4_fname_usr_to_disk(struct inode *inode,
- const struct qstr *iname,
- struct ext4_str *oname);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
-void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
-int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
- int lookup, struct ext4_filename *fname);
-void ext4_fname_free_filename(struct ext4_filename *fname);
-#else
-static inline
-int ext4_setup_fname_crypto(struct inode *inode)
-{
- return 0;
-}
-static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
static inline int ext4_fname_setup_filename(struct inode *dir,
- const struct qstr *iname,
- int lookup, struct ext4_filename *fname)
+ const struct qstr *iname,
+ int lookup, struct ext4_filename *fname)
{
- fname->usr_fname = iname;
- fname->disk_name.name = (unsigned char *) iname->name;
- fname->disk_name.len = iname->len;
- return 0;
-}
-static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
-#endif
-
+ struct fscrypt_name name;
+ int err;
-/* crypto_key.c */
-void ext4_free_crypt_info(struct ext4_crypt_info *ci);
-void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
-int _ext4_get_encryption_info(struct inode *inode);
+ memset(fname, 0, sizeof(struct ext4_filename));
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
-int ext4_has_encryption_key(struct inode *inode);
+ err = fscrypt_setup_filename(dir, iname, lookup, &name);
-static inline int ext4_get_encryption_info(struct inode *inode)
-{
- struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
-
- if (!ci ||
- (ci->ci_keyring_key &&
- (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
- (1 << KEY_FLAG_REVOKED) |
- (1 << KEY_FLAG_DEAD)))))
- return _ext4_get_encryption_info(inode);
- return 0;
+ fname->usr_fname = name.usr_fname;
+ fname->disk_name = name.disk_name;
+ fname->hinfo.hash = name.hash;
+ fname->hinfo.minor_hash = name.minor_hash;
+ fname->crypto_buf = name.crypto_buf;
+ return err;
}
-static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
+static inline void ext4_fname_free_filename(struct ext4_filename *fname)
{
- return EXT4_I(inode)->i_crypt_info;
-}
+ struct fscrypt_name name;
-#else
-static inline int ext4_has_encryption_key(struct inode *inode)
-{
- return 0;
+ name.crypto_buf = fname->crypto_buf;
+ fscrypt_free_filename(&name);
+
+ fname->crypto_buf.name = NULL;
+ fname->usr_fname = NULL;
+ fname->disk_name.name = NULL;
}
-static inline int ext4_get_encryption_info(struct inode *inode)
+#else
+static inline int ext4_fname_setup_filename(struct inode *dir,
+ const struct qstr *iname,
+ int lookup, struct ext4_filename *fname)
{
+ fname->usr_fname = iname;
+ fname->disk_name.name = (unsigned char *) iname->name;
+ fname->disk_name.len = iname->len;
return 0;
}
-static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
-{
- return NULL;
-}
-#endif
+static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
+#define fscrypt_set_d_op(i)
+#define fscrypt_get_ctx fscrypt_notsupp_get_ctx
+#define fscrypt_release_ctx fscrypt_notsupp_release_ctx
+#define fscrypt_encrypt_page fscrypt_notsupp_encrypt_page
+#define fscrypt_decrypt_page fscrypt_notsupp_decrypt_page
+#define fscrypt_decrypt_bio_pages fscrypt_notsupp_decrypt_bio_pages
+#define fscrypt_pullback_bio_page fscrypt_notsupp_pullback_bio_page
+#define fscrypt_restore_control_page fscrypt_notsupp_restore_control_page
+#define fscrypt_zeroout_range fscrypt_notsupp_zeroout_range
+#define fscrypt_process_policy fscrypt_notsupp_process_policy
+#define fscrypt_get_policy fscrypt_notsupp_get_policy
+#define fscrypt_has_permitted_context fscrypt_notsupp_has_permitted_context
+#define fscrypt_inherit_context fscrypt_notsupp_inherit_context
+#define fscrypt_get_encryption_info fscrypt_notsupp_get_encryption_info
+#define fscrypt_put_encryption_info fscrypt_notsupp_put_encryption_info
+#define fscrypt_setup_filename fscrypt_notsupp_setup_filename
+#define fscrypt_free_filename fscrypt_notsupp_free_filename
+#define fscrypt_fname_encrypted_size fscrypt_notsupp_fname_encrypted_size
+#define fscrypt_fname_alloc_buffer fscrypt_notsupp_fname_alloc_buffer
+#define fscrypt_fname_free_buffer fscrypt_notsupp_fname_free_buffer
+#define fscrypt_fname_disk_to_usr fscrypt_notsupp_fname_disk_to_usr
+#define fscrypt_fname_usr_to_disk fscrypt_notsupp_fname_usr_to_disk
+#endif
/* dir.c */
extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
__u32 minor_hash,
struct ext4_dir_entry_2 *dirent,
- struct ext4_str *ent_name);
+ struct fscrypt_str *ent_name);
extern void ext4_htree_free_dir_info(struct dir_private_info *p);
extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
struct buffer_head *bh,
void *entry_buf,
int buf_size,
int csum_size);
-extern int ext4_empty_dir(struct inode *inode);
+extern bool ext4_empty_dir(struct inode *inode);
/* resize.c */
extern int ext4_group_add(struct super_block *sb,
struct ext4_dir_entry_2 *de_del,
struct buffer_head *bh,
int *has_inline_data);
-extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
+extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
struct ext4_dir_entry_2 **parent_de,
int *retval);
+++ /dev/null
-/*
- * linux/fs/ext4/ext4_crypto.h
- *
- * Copyright (C) 2015, Google, Inc.
- *
- * This contains encryption header content for ext4
- *
- * Written by Michael Halcrow, 2015.
- */
-
-#ifndef _EXT4_CRYPTO_H
-#define _EXT4_CRYPTO_H
-
-#include <linux/fs.h>
-
-#define EXT4_KEY_DESCRIPTOR_SIZE 8
-
-/* Policy provided via an ioctl on the topmost directory */
-struct ext4_encryption_policy {
- char version;
- char contents_encryption_mode;
- char filenames_encryption_mode;
- char flags;
- char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
-} __attribute__((__packed__));
-
-#define EXT4_ENCRYPTION_CONTEXT_FORMAT_V1 1
-#define EXT4_KEY_DERIVATION_NONCE_SIZE 16
-
-#define EXT4_POLICY_FLAGS_PAD_4 0x00
-#define EXT4_POLICY_FLAGS_PAD_8 0x01
-#define EXT4_POLICY_FLAGS_PAD_16 0x02
-#define EXT4_POLICY_FLAGS_PAD_32 0x03
-#define EXT4_POLICY_FLAGS_PAD_MASK 0x03
-#define EXT4_POLICY_FLAGS_VALID 0x03
-
-/**
- * Encryption context for inode
- *
- * Protector format:
- * 1 byte: Protector format (1 = this version)
- * 1 byte: File contents encryption mode
- * 1 byte: File names encryption mode
- * 1 byte: Reserved
- * 8 bytes: Master Key descriptor
- * 16 bytes: Encryption Key derivation nonce
- */
-struct ext4_encryption_context {
- char format;
- char contents_encryption_mode;
- char filenames_encryption_mode;
- char flags;
- char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
- char nonce[EXT4_KEY_DERIVATION_NONCE_SIZE];
-} __attribute__((__packed__));
-
-/* Encryption parameters */
-#define EXT4_XTS_TWEAK_SIZE 16
-#define EXT4_AES_128_ECB_KEY_SIZE 16
-#define EXT4_AES_256_GCM_KEY_SIZE 32
-#define EXT4_AES_256_CBC_KEY_SIZE 32
-#define EXT4_AES_256_CTS_KEY_SIZE 32
-#define EXT4_AES_256_XTS_KEY_SIZE 64
-#define EXT4_MAX_KEY_SIZE 64
-
-#define EXT4_KEY_DESC_PREFIX "ext4:"
-#define EXT4_KEY_DESC_PREFIX_SIZE 5
-
-/* This is passed in from userspace into the kernel keyring */
-struct ext4_encryption_key {
- __u32 mode;
- char raw[EXT4_MAX_KEY_SIZE];
- __u32 size;
-} __attribute__((__packed__));
-
-struct ext4_crypt_info {
- char ci_data_mode;
- char ci_filename_mode;
- char ci_flags;
- struct crypto_skcipher *ci_ctfm;
- struct key *ci_keyring_key;
- char ci_master_key[EXT4_KEY_DESCRIPTOR_SIZE];
-};
-
-#define EXT4_CTX_REQUIRES_FREE_ENCRYPT_FL 0x00000001
-#define EXT4_WRITE_PATH_FL 0x00000002
-
-struct ext4_crypto_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 */
- };
- char flags; /* Flags */
- char mode; /* Encryption mode for tfm */
-};
-
-struct ext4_completion_result {
- struct completion completion;
- int res;
-};
-
-#define DECLARE_EXT4_COMPLETION_RESULT(ecr) \
- struct ext4_completion_result ecr = { \
- COMPLETION_INITIALIZER((ecr).completion), 0 }
-
-static inline int ext4_encryption_key_size(int mode)
-{
- switch (mode) {
- case EXT4_ENCRYPTION_MODE_AES_256_XTS:
- return EXT4_AES_256_XTS_KEY_SIZE;
- case EXT4_ENCRYPTION_MODE_AES_256_GCM:
- return EXT4_AES_256_GCM_KEY_SIZE;
- case EXT4_ENCRYPTION_MODE_AES_256_CBC:
- return EXT4_AES_256_CBC_KEY_SIZE;
- case EXT4_ENCRYPTION_MODE_AES_256_CTS:
- return EXT4_AES_256_CTS_KEY_SIZE;
- default:
- BUG();
- }
- return 0;
-}
-
-#define EXT4_FNAME_NUM_SCATTER_ENTRIES 4
-#define EXT4_CRYPTO_BLOCK_SIZE 16
-#define EXT4_FNAME_CRYPTO_DIGEST_SIZE 32
-
-struct ext4_str {
- unsigned char *name;
- u32 len;
-};
-
-/**
- * For encrypted symlinks, the ciphertext length is stored at the beginning
- * of the string in little-endian format.
- */
-struct ext4_encrypted_symlink_data {
- __le16 len;
- char encrypted_path[1];
-} __attribute__((__packed__));
-
-/**
- * This function is used to calculate the disk space required to
- * store a filename of length l in encrypted symlink format.
- */
-static inline u32 encrypted_symlink_data_len(u32 l)
-{
- if (l < EXT4_CRYPTO_BLOCK_SIZE)
- l = EXT4_CRYPTO_BLOCK_SIZE;
- return (l + sizeof(struct ext4_encrypted_symlink_data) - 1);
-}
-
-#endif /* _EXT4_CRYPTO_H */
* There is no guaranteed calling order of multiple registered callbacks on
* the same transaction.
*/
+static inline void _ext4_journal_callback_add(handle_t *handle,
+ struct ext4_journal_cb_entry *jce)
+{
+ /* Add the jce to transaction's private list */
+ list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
+}
+
static inline void ext4_journal_callback_add(handle_t *handle,
void (*func)(struct super_block *sb,
struct ext4_journal_cb_entry *jce,
/* Add the jce to transaction's private list */
jce->jce_func = func;
spin_lock(&sbi->s_md_lock);
- list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
+ _ext4_journal_callback_add(handle, jce);
spin_unlock(&sbi->s_md_lock);
}
+
/**
* ext4_journal_callback_del: delete a registered callback
* @handle: active journal transaction handle on which callback was registered
ext4_fsblk_t block = ext4_ext_pblock(ext);
int len = ext4_ext_get_actual_len(ext);
ext4_lblk_t lblock = le32_to_cpu(ext->ee_block);
- ext4_lblk_t last = lblock + len - 1;
- if (len == 0 || lblock > last)
+ /*
+ * We allow neither:
+ * - zero length
+ * - overflow/wrap-around
+ */
+ if (lblock + len <= lblock)
return 0;
return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
}
error_msg = "invalid extent entries";
goto corrupted;
}
+ if (unlikely(depth > 32)) {
+ error_msg = "too large eh_depth";
+ goto corrupted;
+ }
/* Verify checksum on non-root extent tree nodes */
if (ext_depth(inode) != depth &&
!ext4_extent_block_csum_verify(inode, eh)) {
struct inode *inode = file->f_mapping->host;
if (ext4_encrypted_inode(inode)) {
- int err = ext4_get_encryption_info(inode);
+ int err = fscrypt_get_encryption_info(inode);
if (err)
return 0;
- if (ext4_encryption_info(inode) == NULL)
+ if (!fscrypt_has_encryption_key(inode))
return -ENOKEY;
}
file_accessed(file);
}
}
if (ext4_encrypted_inode(inode)) {
- ret = ext4_get_encryption_info(inode);
+ ret = fscrypt_get_encryption_info(inode);
if (ret)
return -EACCES;
- if (ext4_encryption_info(inode) == NULL)
+ if (!fscrypt_has_encryption_key(inode))
return -ENOKEY;
}
dir = dget_parent(file_dentry(filp));
if (ext4_encrypted_inode(d_inode(dir)) &&
- !ext4_is_child_context_consistent_with_parent(d_inode(dir), inode)) {
+ !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,
}
if (!journal) {
- ret = generic_file_fsync(file, start, end, datasync);
+ ret = __generic_file_fsync(file, start, end, datasync);
if (!ret && !hlist_empty(&inode->i_dentry))
ret = ext4_sync_parent(inode);
+ if (test_opt(inode->i_sb, BARRIER))
+ goto issue_flush;
goto out;
}
needs_barrier = true;
ret = jbd2_complete_transaction(journal, commit_tid);
if (needs_barrier) {
+ issue_flush:
err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
if (!ret)
ret = err;
if ((ext4_encrypted_inode(dir) ||
DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))) &&
(S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) {
- err = ext4_get_encryption_info(dir);
+ err = fscrypt_get_encryption_info(dir);
if (err)
return ERR_PTR(err);
- if (ext4_encryption_info(dir) == NULL)
+ if (!fscrypt_has_encryption_key(dir))
return ERR_PTR(-EPERM);
if (!handle)
nblocks += EXT4_DATA_TRANS_BLOCKS(dir->i_sb);
}
if (encrypt) {
- err = ext4_inherit_context(dir, inode);
+ /* give pointer to avoid set_context with journal ops. */
+ err = fscrypt_inherit_context(dir, inode, &encrypt, true);
if (err)
goto fail_free_drop;
}
struct ext4_iloc iloc;
void *dir_buf = NULL;
struct ext4_dir_entry_2 fake;
- struct ext4_str tmp_str;
+ struct fscrypt_str tmp_str;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
return (struct ext4_dir_entry_2 *)(inline_pos + offset);
}
-int empty_inline_dir(struct inode *dir, int *has_inline_data)
+bool empty_inline_dir(struct inode *dir, int *has_inline_data)
{
int err, inline_size;
struct ext4_iloc iloc;
void *inline_pos;
unsigned int offset;
struct ext4_dir_entry_2 *de;
- int ret = 1;
+ bool ret = true;
err = ext4_get_inode_loc(dir, &iloc);
if (err) {
EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
err, dir->i_ino);
- return 1;
+ return true;
}
down_read(&EXT4_I(dir)->xattr_sem);
ext4_warning(dir->i_sb,
"bad inline directory (dir #%lu) - no `..'",
dir->i_ino);
- ret = 1;
+ ret = true;
goto out;
}
dir->i_ino, le32_to_cpu(de->inode),
le16_to_cpu(de->rec_len), de->name_len,
inline_size);
- ret = 1;
+ ret = true;
goto out;
}
if (le32_to_cpu(de->inode)) {
- ret = 0;
+ ret = false;
goto out;
}
offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
struct ext4_inode_info *ei)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
- __u16 csum_lo;
- __u16 csum_hi = 0;
__u32 csum;
+ __u16 dummy_csum = 0;
+ int offset = offsetof(struct ext4_inode, i_checksum_lo);
+ unsigned int csum_size = sizeof(dummy_csum);
- csum_lo = le16_to_cpu(raw->i_checksum_lo);
- raw->i_checksum_lo = 0;
- if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE &&
- EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) {
- csum_hi = le16_to_cpu(raw->i_checksum_hi);
- raw->i_checksum_hi = 0;
- }
-
- csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)raw,
- EXT4_INODE_SIZE(inode->i_sb));
+ csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)raw, offset);
+ csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, csum_size);
+ offset += csum_size;
+ csum = ext4_chksum(sbi, csum, (__u8 *)raw + offset,
+ EXT4_GOOD_OLD_INODE_SIZE - offset);
- raw->i_checksum_lo = cpu_to_le16(csum_lo);
- if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE &&
- EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi))
- raw->i_checksum_hi = cpu_to_le16(csum_hi);
+ if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) {
+ offset = offsetof(struct ext4_inode, i_checksum_hi);
+ csum = ext4_chksum(sbi, csum, (__u8 *)raw +
+ EXT4_GOOD_OLD_INODE_SIZE,
+ offset - EXT4_GOOD_OLD_INODE_SIZE);
+ if (EXT4_FITS_IN_INODE(raw, ei, i_checksum_hi)) {
+ csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum,
+ csum_size);
+ offset += csum_size;
+ csum = ext4_chksum(sbi, csum, (__u8 *)raw + offset,
+ EXT4_INODE_SIZE(inode->i_sb) -
+ offset);
+ }
+ }
return csum;
}
* Note that directories do not have this problem because they
* don't use page cache.
*/
- if (ext4_should_journal_data(inode) &&
- (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode)) &&
- inode->i_ino != EXT4_JOURNAL_INO) {
+ if (inode->i_ino != EXT4_JOURNAL_INO &&
+ ext4_should_journal_data(inode) &&
+ (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode))) {
journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
tid_t commit_tid = EXT4_I(inode)->i_datasync_tid;
int ret;
if (ext4_encrypted_inode(inode))
- return ext4_encrypted_zeroout(inode, lblk, pblk, len);
+ return fscrypt_zeroout_range(inode, lblk, pblk, len);
ret = sb_issue_zeroout(inode->i_sb, pblk, len, GFP_NOFS);
if (ret > 0)
if (unlikely(err))
page_zero_new_buffers(page, from, to);
else if (decrypt)
- err = ext4_decrypt(page);
+ err = fscrypt_decrypt_page(page);
return err;
}
#endif
done = true;
}
}
- ext4_journal_stop(handle);
+ /*
+ * Caution: If the handle is synchronous,
+ * ext4_journal_stop() can wait for transaction commit
+ * to finish which may depend on writeback of pages to
+ * complete or on page lock to be released. In that
+ * case, we have to wait until after after we have
+ * submitted all the IO, released page locks we hold,
+ * and dropped io_end reference (for extent conversion
+ * to be able to complete) before stopping the handle.
+ */
+ if (!ext4_handle_valid(handle) || handle->h_sync == 0) {
+ ext4_journal_stop(handle);
+ handle = NULL;
+ }
/* Submit prepared bio */
ext4_io_submit(&mpd.io_submit);
/* Unlock pages we didn't use */
mpage_release_unused_pages(&mpd, give_up_on_write);
- /* Drop our io_end reference we got from init */
- ext4_put_io_end(mpd.io_submit.io_end);
+ /*
+ * Drop our io_end reference we got from init. We have
+ * to be careful and use deferred io_end finishing if
+ * we are still holding the transaction as we can
+ * release the last reference to io_end which may end
+ * up doing unwritten extent conversion.
+ */
+ if (handle) {
+ ext4_put_io_end_defer(mpd.io_submit.io_end);
+ ext4_journal_stop(handle);
+ } else
+ ext4_put_io_end(mpd.io_submit.io_end);
if (ret == -ENOSPC && sbi->s_journal) {
/*
if (S_ISREG(inode->i_mode) &&
ext4_encrypted_inode(inode)) {
/* We expect the key to be set. */
- BUG_ON(!ext4_has_encryption_key(inode));
+ BUG_ON(!fscrypt_has_encryption_key(inode));
BUG_ON(blocksize != PAGE_SIZE);
- WARN_ON_ONCE(ext4_decrypt(page));
+ WARN_ON_ONCE(fscrypt_decrypt_page(page));
}
}
if (ext4_should_journal_data(inode)) {
kprojid_t kprojid;
struct ext4_iloc iloc;
struct ext4_inode *raw_inode;
+ struct dquot *transfer_to[MAXQUOTAS] = { };
if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
EXT4_FEATURE_RO_COMPAT_PROJECT)) {
if (err)
goto out_stop;
- if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
- struct dquot *transfer_to[MAXQUOTAS] = { };
-
- transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
- if (!IS_ERR(transfer_to[PRJQUOTA])) {
- err = __dquot_transfer(inode, transfer_to);
- dqput(transfer_to[PRJQUOTA]);
- if (err)
- goto out_dirty;
- }
+ transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
+ if (!IS_ERR(transfer_to[PRJQUOTA])) {
+ err = __dquot_transfer(inode, transfer_to);
+ dqput(transfer_to[PRJQUOTA]);
+ if (err)
+ goto out_dirty;
}
+
EXT4_I(inode)->i_projid = kprojid;
inode->i_ctime = ext4_current_time(inode);
out_dirty:
return ext4_ext_precache(inode);
case EXT4_IOC_SET_ENCRYPTION_POLICY: {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
- struct ext4_encryption_policy policy;
- int err = 0;
+ struct fscrypt_policy policy;
if (copy_from_user(&policy,
- (struct ext4_encryption_policy __user *)arg,
- sizeof(policy))) {
- err = -EFAULT;
- goto encryption_policy_out;
- }
-
- err = ext4_process_policy(&policy, inode);
-encryption_policy_out:
- return err;
+ (struct fscrypt_policy __user *)arg,
+ sizeof(policy)))
+ return -EFAULT;
+ return fscrypt_process_policy(inode, &policy);
#else
return -EOPNOTSUPP;
#endif
}
case EXT4_IOC_GET_ENCRYPTION_POLICY: {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
- struct ext4_encryption_policy policy;
+ struct fscrypt_policy policy;
int err = 0;
if (!ext4_encrypted_inode(inode))
return -ENOENT;
- err = ext4_get_policy(inode, &policy);
+ err = fscrypt_get_policy(inode, &policy);
if (err)
return err;
if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
spin_lock_init(&sbi->s_md_lock);
spin_lock_init(&sbi->s_bal_lock);
+ sbi->s_mb_free_pending = 0;
sbi->s_mb_max_to_scan = MB_DEFAULT_MAX_TO_SCAN;
sbi->s_mb_min_to_scan = MB_DEFAULT_MIN_TO_SCAN;
/* we expect to find existing buddy because it's pinned */
BUG_ON(err != 0);
+ spin_lock(&EXT4_SB(sb)->s_md_lock);
+ EXT4_SB(sb)->s_mb_free_pending -= entry->efd_count;
+ spin_unlock(&EXT4_SB(sb)->s_md_lock);
db = e4b.bd_info;
/* there are blocks to put in buddy to make them really free */
ext4_error(sb, "Allocating blocks %llu-%llu which overlap "
"fs metadata", block, block+len);
/* File system mounted not to panic on error
- * Fix the bitmap and repeat the block allocation
+ * Fix the bitmap and return EFSCORRUPTED
* We leak some of the blocks here.
*/
ext4_lock_group(sb, ac->ac_b_ex.fe_group);
ext4_unlock_group(sb, ac->ac_b_ex.fe_group);
err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
if (!err)
- err = -EAGAIN;
+ err = -EFSCORRUPTED;
goto out_err;
}
}
if (likely(ac->ac_status == AC_STATUS_FOUND)) {
*errp = ext4_mb_mark_diskspace_used(ac, handle, reserv_clstrs);
- if (*errp == -EAGAIN) {
- /*
- * drop the reference that we took
- * in ext4_mb_use_best_found
- */
- ext4_mb_release_context(ac);
- ac->ac_b_ex.fe_group = 0;
- ac->ac_b_ex.fe_start = 0;
- ac->ac_b_ex.fe_len = 0;
- ac->ac_status = AC_STATUS_CONTINUE;
- goto repeat;
- } else if (*errp) {
+ if (*errp) {
ext4_discard_allocated_blocks(ac);
goto errout;
} else {
{
ext4_group_t group = e4b->bd_group;
ext4_grpblk_t cluster;
+ ext4_grpblk_t clusters = new_entry->efd_count;
struct ext4_free_data *entry;
struct ext4_group_info *db = e4b->bd_info;
struct super_block *sb = e4b->bd_sb;
}
}
/* Add the extent to transaction's private list */
- ext4_journal_callback_add(handle, ext4_free_data_callback,
- &new_entry->efd_jce);
+ new_entry->efd_jce.jce_func = ext4_free_data_callback;
+ spin_lock(&sbi->s_md_lock);
+ _ext4_journal_callback_add(handle, &new_entry->efd_jce);
+ sbi->s_mb_free_pending += clusters;
+ spin_unlock(&sbi->s_md_lock);
return 0;
}
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct ext4_inode_info *ei = EXT4_I(inode);
__u32 csum;
- __le32 save_csum;
int size;
+ __u32 dummy_csum = 0;
+ int offset = offsetof(struct dx_tail, dt_checksum);
size = count_offset + (count * sizeof(struct dx_entry));
- save_csum = t->dt_checksum;
- t->dt_checksum = 0;
csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
- csum = ext4_chksum(sbi, csum, (__u8 *)t, sizeof(struct dx_tail));
- t->dt_checksum = save_csum;
+ csum = ext4_chksum(sbi, csum, (__u8 *)t, offset);
+ csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
return cpu_to_le32(csum);
}
c = get_dx_countlimit(inode, dirent, &count_offset);
if (!c) {
EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
- return 1;
+ return 0;
}
limit = le16_to_cpu(c->limit);
count = le16_to_cpu(c->count);
if (count_offset + (limit * sizeof(struct dx_entry)) >
EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
warn_no_space_for_csum(inode);
- return 1;
+ return 0;
}
t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
int len;
char *name;
- struct ext4_str fname_crypto_str
- = {.name = NULL, .len = 0};
+ struct fscrypt_str fname_crypto_str =
+ FSTR_INIT(NULL, 0);
int res = 0;
name = de->name;
len = de->name_len;
- if (ext4_encrypted_inode(inode))
- res = ext4_get_encryption_info(dir);
+ if (ext4_encrypted_inode(dir))
+ res = fscrypt_get_encryption_info(dir);
if (res) {
printk(KERN_WARNING "Error setting up"
" fname crypto: %d\n", res);
}
- if (ctx == NULL) {
+ if (!fscrypt_has_encryption_key(dir)) {
/* Directory is not encrypted */
ext4fs_dirhash(de->name,
de->name_len, &h);
(unsigned) ((char *) de
- base));
} else {
+ struct fscrypt_str de_name =
+ FSTR_INIT(name, len);
+
/* Directory is encrypted */
- res = ext4_fname_crypto_alloc_buffer(
- ctx, de->name_len,
+ res = fscrypt_fname_alloc_buffer(
+ dir, len,
&fname_crypto_str);
- if (res < 0) {
+ if (res < 0)
printk(KERN_WARNING "Error "
"allocating crypto "
"buffer--skipping "
"crypto\n");
- ctx = NULL;
- }
- res = ext4_fname_disk_to_usr(ctx, NULL, de,
- &fname_crypto_str);
+ res = fscrypt_fname_disk_to_usr(dir,
+ 0, 0, &de_name,
+ &fname_crypto_str);
if (res < 0) {
printk(KERN_WARNING "Error "
"converting filename "
printk("%*.s:(E)%x.%u ", len, name,
h.hash, (unsigned) ((char *) de
- base));
- ext4_fname_crypto_free_buffer(
- &fname_crypto_str);
+ fscrypt_fname_free_buffer(
+ &fname_crypto_str);
}
#else
int len = de->name_len;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de, *top;
int err = 0, count = 0;
- struct ext4_str fname_crypto_str = {.name = NULL, .len = 0}, tmp_str;
+ struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str;
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
(unsigned long)block));
#ifdef CONFIG_EXT4_FS_ENCRYPTION
/* Check if the directory is encrypted */
if (ext4_encrypted_inode(dir)) {
- err = ext4_get_encryption_info(dir);
+ err = fscrypt_get_encryption_info(dir);
if (err < 0) {
brelse(bh);
return err;
}
- err = ext4_fname_crypto_alloc_buffer(dir, EXT4_NAME_LEN,
+ err = fscrypt_fname_alloc_buffer(dir, EXT4_NAME_LEN,
&fname_crypto_str);
if (err < 0) {
brelse(bh);
&tmp_str);
} else {
int save_len = fname_crypto_str.len;
+ struct fscrypt_str de_name = FSTR_INIT(de->name,
+ de->name_len);
/* Directory is encrypted */
- err = ext4_fname_disk_to_usr(dir, hinfo, de,
- &fname_crypto_str);
+ err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
+ hinfo->minor_hash, &de_name,
+ &fname_crypto_str);
if (err < 0) {
count = err;
goto errout;
errout:
brelse(bh);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
- ext4_fname_crypto_free_buffer(&fname_crypto_str);
+ fscrypt_fname_free_buffer(&fname_crypto_str);
#endif
return count;
}
int count = 0;
int ret, err;
__u32 hashval;
- struct ext4_str tmp_str;
+ struct fscrypt_str tmp_str;
dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
start_hash, start_minor_hash));
struct ext4_dir_entry_2 *de;
struct buffer_head *bh;
- if (ext4_encrypted_inode(dir)) {
- int res = ext4_get_encryption_info(dir);
+ if (ext4_encrypted_inode(dir)) {
+ int res = fscrypt_get_encryption_info(dir);
/*
- * This should be a properly defined flag for
- * dentry->d_flags when we uplift this to the VFS.
- * d_fsdata is set to (void *) 1 if if the dentry is
+ * 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.
+ * have access to the key.
*/
- dentry->d_fsdata = NULL;
- if (ext4_encryption_info(dir))
- dentry->d_fsdata = (void *) 1;
- d_set_d_op(dentry, &ext4_encrypted_d_ops);
- if (res && res != -ENOKEY)
- return ERR_PTR(res);
- }
+ if (fscrypt_has_encryption_key(dir))
+ fscrypt_set_encrypted_dentry(dentry);
+ fscrypt_set_d_op(dentry);
+ if (res && res != -ENOKEY)
+ return ERR_PTR(res);
+ }
- 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))
}
if (!IS_ERR(inode) && ext4_encrypted_inode(dir) &&
(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
- !ext4_is_child_context_consistent_with_parent(dir,
- inode)) {
+ !fscrypt_has_permitted_context(dir, inode)) {
int nokey = ext4_encrypted_inode(inode) &&
- !ext4_encryption_info(inode);
-
+ !fscrypt_has_encryption_key(inode);
iput(inode);
if (nokey)
return ERR_PTR(-ENOKEY);
/*
* routine to check that the specified directory is empty (for rmdir)
*/
-int ext4_empty_dir(struct inode *inode)
+bool ext4_empty_dir(struct inode *inode)
{
unsigned int offset;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de, *de1;
struct super_block *sb;
- int err = 0;
if (ext4_has_inline_data(inode)) {
int has_inline_data = 1;
+ int ret;
- err = empty_inline_dir(inode, &has_inline_data);
+ ret = empty_inline_dir(inode, &has_inline_data);
if (has_inline_data)
- return err;
+ return ret;
}
sb = inode->i_sb;
if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) {
EXT4_ERROR_INODE(inode, "invalid size");
- return 1;
+ return true;
}
bh = ext4_read_dirblock(inode, 0, EITHER);
if (IS_ERR(bh))
- return 1;
+ return true;
de = (struct ext4_dir_entry_2 *) bh->b_data;
de1 = ext4_next_entry(de, sb->s_blocksize);
strcmp(".", de->name) || strcmp("..", de1->name)) {
ext4_warning_inode(inode, "directory missing '.' and/or '..'");
brelse(bh);
- return 1;
+ return true;
}
offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) +
ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize);
while (offset < inode->i_size) {
if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
unsigned int lblock;
- err = 0;
brelse(bh);
lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
bh = ext4_read_dirblock(inode, lblock, EITHER);
if (IS_ERR(bh))
- return 1;
+ return true;
de = (struct ext4_dir_entry_2 *) bh->b_data;
}
if (ext4_check_dir_entry(inode, NULL, de, bh,
}
if (le32_to_cpu(de->inode)) {
brelse(bh);
- return 0;
+ return false;
}
offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
de = ext4_next_entry(de, sb->s_blocksize);
}
brelse(bh);
- return 1;
+ return true;
}
/*
int err, len = strlen(symname);
int credits;
bool encryption_required;
- struct ext4_str disk_link;
- struct ext4_encrypted_symlink_data *sd = NULL;
+ struct fscrypt_str disk_link;
+ struct fscrypt_symlink_data *sd = NULL;
disk_link.len = len + 1;
disk_link.name = (char *) symname;
encryption_required = (ext4_encrypted_inode(dir) ||
DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb)));
if (encryption_required) {
- err = ext4_get_encryption_info(dir);
+ err = fscrypt_get_encryption_info(dir);
if (err)
return err;
- if (ext4_encryption_info(dir) == NULL)
+ if (!fscrypt_has_encryption_key(dir))
return -EPERM;
- disk_link.len = (ext4_fname_encrypted_size(dir, len) +
- sizeof(struct ext4_encrypted_symlink_data));
+ disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
+ sizeof(struct fscrypt_symlink_data));
sd = kzalloc(disk_link.len, GFP_KERNEL);
if (!sd)
return -ENOMEM;
if (encryption_required) {
struct qstr istr;
- struct ext4_str ostr;
+ struct fscrypt_str ostr =
+ FSTR_INIT(sd->encrypted_path, disk_link.len);
istr.name = (const unsigned char *) symname;
istr.len = len;
- ostr.name = sd->encrypted_path;
- ostr.len = disk_link.len;
- err = ext4_fname_usr_to_disk(inode, &istr, &ostr);
+ err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
if (err < 0)
goto err_drop_inode;
sd->len = cpu_to_le16(ostr.len);
if (inode->i_nlink >= EXT4_LINK_MAX)
return -EMLINK;
if (ext4_encrypted_inode(dir) &&
- !ext4_is_child_context_consistent_with_parent(dir, inode))
+ !fscrypt_has_permitted_context(dir, inode))
return -EPERM;
if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
if ((old.dir != new.dir) &&
ext4_encrypted_inode(new.dir) &&
- !ext4_is_child_context_consistent_with_parent(new.dir,
- old.inode)) {
+ !fscrypt_has_permitted_context(new.dir, old.inode)) {
retval = -EPERM;
goto end_rename;
}
if ((ext4_encrypted_inode(old_dir) ||
ext4_encrypted_inode(new_dir)) &&
(old_dir != new_dir) &&
- (!ext4_is_child_context_consistent_with_parent(new_dir,
- old.inode) ||
- !ext4_is_child_context_consistent_with_parent(old_dir,
- new.inode)))
+ (!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) &&
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/backing-dev.h>
+#include <linux/fscrypto.h>
#include "ext4_jbd2.h"
#include "xattr.h"
struct page *page = bvec->bv_page;
#ifdef CONFIG_EXT4_FS_ENCRYPTION
struct page *data_page = NULL;
- struct ext4_crypto_ctx *ctx = NULL;
#endif
struct buffer_head *bh, *head;
unsigned bio_start = bvec->bv_offset;
if (!page->mapping) {
/* The bounce data pages are unmapped. */
data_page = page;
- ctx = (struct ext4_crypto_ctx *)page_private(data_page);
- page = ctx->w.control_page;
+ fscrypt_pullback_bio_page(&page, false);
}
#endif
local_irq_restore(flags);
if (!under_io) {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
- if (ctx)
- ext4_restore_control_page(data_page);
+ if (data_page)
+ fscrypt_restore_control_page(data_page);
#endif
end_page_writeback(page);
}
gfp_t gfp_flags = GFP_NOFS;
retry_encrypt:
- data_page = ext4_encrypt(inode, page, gfp_flags);
+ data_page = fscrypt_encrypt_page(inode, page, gfp_flags);
if (IS_ERR(data_page)) {
ret = PTR_ERR(data_page);
if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) {
if (ret) {
out:
if (data_page)
- ext4_restore_control_page(data_page);
+ fscrypt_restore_control_page(data_page);
printk_ratelimited(KERN_ERR "%s: ret = %d\n", __func__, ret);
redirty_page_for_writepage(wbc, page);
do {
#include "ext4.h"
-/*
- * Call ext4_decrypt on every single page, reusing the encryption
- * context.
- */
-static void completion_pages(struct work_struct *work)
-{
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
- struct ext4_crypto_ctx *ctx =
- container_of(work, struct ext4_crypto_ctx, r.work);
- struct bio *bio = ctx->r.bio;
- struct bio_vec *bv;
- int i;
-
- bio_for_each_segment_all(bv, bio, i) {
- struct page *page = bv->bv_page;
-
- int ret = ext4_decrypt(page);
- if (ret) {
- WARN_ON_ONCE(1);
- SetPageError(page);
- } else
- SetPageUptodate(page);
- unlock_page(page);
- }
- ext4_release_crypto_ctx(ctx);
- bio_put(bio);
-#else
- BUG();
-#endif
-}
-
static inline bool ext4_bio_encrypted(struct bio *bio)
{
#ifdef CONFIG_EXT4_FS_ENCRYPTION
int i;
if (ext4_bio_encrypted(bio)) {
- struct ext4_crypto_ctx *ctx = bio->bi_private;
-
if (bio->bi_error) {
- ext4_release_crypto_ctx(ctx);
+ fscrypt_release_ctx(bio->bi_private);
} else {
- INIT_WORK(&ctx->r.work, completion_pages);
- ctx->r.bio = bio;
- queue_work(ext4_read_workqueue, &ctx->r.work);
+ fscrypt_decrypt_bio_pages(bio->bi_private, bio);
return;
}
}
unsigned nr_pages)
{
struct bio *bio = NULL;
- unsigned page_idx;
sector_t last_block_in_bio = 0;
struct inode *inode = mapping->host;
map.m_len = 0;
map.m_flags = 0;
- for (page_idx = 0; nr_pages; page_idx++, nr_pages--) {
+ for (; nr_pages; nr_pages--) {
int fully_mapped = 1;
unsigned first_hole = blocks_per_page;
bio = NULL;
}
if (bio == NULL) {
- struct ext4_crypto_ctx *ctx = NULL;
+ struct fscrypt_ctx *ctx = NULL;
if (ext4_encrypted_inode(inode) &&
S_ISREG(inode->i_mode)) {
- ctx = ext4_get_crypto_ctx(inode, GFP_NOFS);
+ ctx = fscrypt_get_ctx(inode, GFP_NOFS);
if (IS_ERR(ctx))
goto set_error_page;
}
min_t(int, nr_pages, BIO_MAX_PAGES));
if (!bio) {
if (ctx)
- ext4_release_crypto_ctx(ctx);
+ fscrypt_release_ctx(ctx);
goto set_error_page;
}
bio->bi_bdev = bdev;
ei->i_datasync_tid = 0;
atomic_set(&ei->i_unwritten, 0);
INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
- ei->i_crypt_info = NULL;
-#endif
return &ei->vfs_inode;
}
EXT4_I(inode)->jinode = NULL;
}
#ifdef CONFIG_EXT4_FS_ENCRYPTION
- if (EXT4_I(inode)->i_crypt_info)
- ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
+ fscrypt_put_encryption_info(inode, NULL);
#endif
}
return try_to_free_buffers(page);
}
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
+static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
+{
+ return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
+ EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
+}
+
+static int ext4_key_prefix(struct inode *inode, u8 **key)
+{
+ *key = EXT4_SB(inode->i_sb)->key_prefix;
+ return EXT4_SB(inode->i_sb)->key_prefix_size;
+}
+
+static int ext4_prepare_context(struct inode *inode)
+{
+ return ext4_convert_inline_data(inode);
+}
+
+static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
+ void *fs_data)
+{
+ handle_t *handle;
+ int res, res2;
+
+ /* fs_data is null when internally used. */
+ if (fs_data) {
+ res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
+ EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
+ len, 0);
+ if (!res) {
+ ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
+ ext4_clear_inode_state(inode,
+ EXT4_STATE_MAY_INLINE_DATA);
+ }
+ return res;
+ }
+
+ handle = ext4_journal_start(inode, EXT4_HT_MISC,
+ ext4_jbd2_credits_xattr(inode));
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+
+ res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
+ EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
+ len, 0);
+ if (!res) {
+ ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
+ res = ext4_mark_inode_dirty(handle, inode);
+ if (res)
+ EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
+ }
+ res2 = ext4_journal_stop(handle);
+ if (!res)
+ res = res2;
+ return res;
+}
+
+static int ext4_dummy_context(struct inode *inode)
+{
+ return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
+}
+
+static unsigned ext4_max_namelen(struct inode *inode)
+{
+ return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
+ EXT4_NAME_LEN;
+}
+
+static struct fscrypt_operations ext4_cryptops = {
+ .get_context = ext4_get_context,
+ .key_prefix = ext4_key_prefix,
+ .prepare_context = ext4_prepare_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 struct fscrypt_operations ext4_cryptops = {
+ .is_encrypted = ext4_encrypted_inode,
+};
+#endif
+
#ifdef CONFIG_QUOTA
static char *quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
struct ext4_group_desc *gdp)
{
- int offset;
+ int offset = offsetof(struct ext4_group_desc, bg_checksum);
__u16 crc = 0;
__le32 le_group = cpu_to_le32(block_group);
struct ext4_sb_info *sbi = EXT4_SB(sb);
if (ext4_has_metadata_csum(sbi->s_sb)) {
/* Use new metadata_csum algorithm */
- __le16 save_csum;
__u32 csum32;
+ __u16 dummy_csum = 0;
- save_csum = gdp->bg_checksum;
- gdp->bg_checksum = 0;
csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
sizeof(le_group));
- csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
- sbi->s_desc_size);
- gdp->bg_checksum = save_csum;
+ csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
+ csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
+ sizeof(dummy_csum));
+ offset += sizeof(dummy_csum);
+ if (offset < sbi->s_desc_size)
+ csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
+ sbi->s_desc_size - offset);
crc = csum32 & 0xFFFF;
goto out;
if (!ext4_has_feature_gdt_csum(sb))
return 0;
- offset = offsetof(struct ext4_group_desc, bg_checksum);
-
crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
crc = crc16(crc, (__u8 *)gdp, offset);
while (es->s_last_orphan) {
struct inode *inode;
+ /*
+ * We may have encountered an error during cleanup; if
+ * so, skip the rest.
+ */
+ if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
+ jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
+ es->s_last_orphan = 0;
+ break;
+ }
+
inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
if (IS_ERR(inode)) {
es->s_last_orphan = 0;
goto failed_mount;
}
+ if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
+ ext4_msg(sb, KERN_ERR,
+ "Number of reserved GDT blocks insanely large: %d",
+ le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
+ goto failed_mount;
+ }
+
if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
err = bdev_dax_supported(sb, blocksize);
if (err)
sb->s_op = &ext4_sops;
sb->s_export_op = &ext4_export_ops;
sb->s_xattr = ext4_xattr_handlers;
+ sb->s_cop = &ext4_cryptops;
#ifdef CONFIG_QUOTA
sb->dq_op = &ext4_quota_operations;
if (ext4_has_feature_quota(sb))
ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
kfree(orig_data);
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
+ memcpy(sbi->key_prefix, EXT4_KEY_DESC_PREFIX,
+ EXT4_KEY_DESC_PREFIX_SIZE);
+ sbi->key_prefix_size = EXT4_KEY_DESC_PREFIX_SIZE;
+#endif
return 0;
cantfind_ext4:
if (!sbh || block_device_ejected(sb))
return error;
- if (buffer_write_io_error(sbh)) {
- /*
- * Oh, dear. A previous attempt to write the
- * superblock failed. This could happen because the
- * USB device was yanked out. Or it could happen to
- * be a transient write error and maybe the block will
- * be remapped. Nothing we can do but to retry the
- * write and hope for the best.
- */
- ext4_msg(sb, KERN_ERR, "previous I/O error to "
- "superblock detected");
- clear_buffer_write_io_error(sbh);
- set_buffer_uptodate(sbh);
- }
/*
* If the file system is mounted read-only, don't update the
* superblock write time. This avoids updating the superblock
&EXT4_SB(sb)->s_freeinodes_counter));
BUFFER_TRACE(sbh, "marking dirty");
ext4_superblock_csum_set(sb);
+ lock_buffer(sbh);
+ if (buffer_write_io_error(sbh)) {
+ /*
+ * Oh, dear. A previous attempt to write the
+ * superblock failed. This could happen because the
+ * USB device was yanked out. Or it could happen to
+ * be a transient write error and maybe the block will
+ * be remapped. Nothing we can do but to retry the
+ * write and hope for the best.
+ */
+ ext4_msg(sb, KERN_ERR, "previous I/O error to "
+ "superblock detected");
+ clear_buffer_write_io_error(sbh);
+ set_buffer_uptodate(sbh);
+ }
mark_buffer_dirty(sbh);
+ unlock_buffer(sbh);
if (sync) {
error = __sync_dirty_buffer(sbh,
test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
static void __exit ext4_exit_fs(void)
{
- ext4_exit_crypto();
ext4_destroy_lazyinit_thread();
unregister_as_ext2();
unregister_as_ext3();
#include "ext4.h"
#include "xattr.h"
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
static const char *ext4_encrypted_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct page *cpage = NULL;
char *caddr, *paddr = NULL;
- struct ext4_str cstr, pstr;
- struct ext4_encrypted_symlink_data *sd;
+ struct fscrypt_str cstr, pstr;
+ struct fscrypt_symlink_data *sd;
loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
int res;
- u32 plen, max_size = inode->i_sb->s_blocksize;
+ u32 max_size = inode->i_sb->s_blocksize;
if (!dentry)
return ERR_PTR(-ECHILD);
- res = ext4_get_encryption_info(inode);
+ res = fscrypt_get_encryption_info(inode);
if (res)
return ERR_PTR(res);
}
/* Symlink is encrypted */
- sd = (struct ext4_encrypted_symlink_data *)caddr;
+ sd = (struct fscrypt_symlink_data *)caddr;
cstr.name = sd->encrypted_path;
cstr.len = le16_to_cpu(sd->len);
- if ((cstr.len +
- sizeof(struct ext4_encrypted_symlink_data) - 1) >
- max_size) {
+ if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
/* Symlink data on the disk is corrupted */
res = -EFSCORRUPTED;
goto errout;
}
- plen = (cstr.len < EXT4_FNAME_CRYPTO_DIGEST_SIZE*2) ?
- EXT4_FNAME_CRYPTO_DIGEST_SIZE*2 : cstr.len;
- paddr = kmalloc(plen + 1, GFP_NOFS);
- if (!paddr) {
- res = -ENOMEM;
+
+ res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
+ if (res)
goto errout;
- }
- pstr.name = paddr;
- pstr.len = plen;
- res = _ext4_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
+
+ res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
if (res < 0)
goto errout;
+
+ paddr = pstr.name;
+
/* Null-terminate the name */
- if (res <= plen)
+ if (res <= pstr.len)
paddr[res] = '\0';
if (cpage)
put_page(cpage);
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
};
-#endif
const struct inode_operations ext4_symlink_inode_operations = {
.readlink = generic_readlink,
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
__u32 csum;
- __le32 save_csum;
__le64 dsk_block_nr = cpu_to_le64(block_nr);
+ __u32 dummy_csum = 0;
+ int offset = offsetof(struct ext4_xattr_header, h_checksum);
- save_csum = hdr->h_checksum;
- hdr->h_checksum = 0;
csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr,
sizeof(dsk_block_nr));
- csum = ext4_chksum(sbi, csum, (__u8 *)hdr,
- EXT4_BLOCK_SIZE(inode->i_sb));
+ csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset);
+ csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
+ offset += sizeof(dummy_csum);
+ csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset,
+ EXT4_BLOCK_SIZE(inode->i_sb) - offset);
- hdr->h_checksum = save_csum;
return cpu_to_le32(csum);
}
struct commit_header *tmp;
struct buffer_head *bh;
int ret;
- struct timespec now = current_kernel_time();
+ struct timespec64 now = current_kernel_time64();
*cbh = NULL;
{
int err = 0;
+ jbd2_might_wait_for_commit(journal);
read_lock(&journal->j_state_lock);
#ifdef CONFIG_JBD2_DEBUG
if (!tid_geq(journal->j_commit_request, tid)) {
static journal_t * journal_init_common (void)
{
+ static struct lock_class_key jbd2_trans_commit_key;
journal_t *journal;
int err;
spin_lock_init(&journal->j_history_lock);
+ lockdep_init_map(&journal->j_trans_commit_map, "jbd2_handle",
+ &jbd2_trans_commit_key, 0);
+
return journal;
}
int needed;
int total = blocks + rsv_blocks;
+ jbd2_might_wait_for_commit(journal);
+
/*
* If the current transaction is locked down for commit, wait
* for the lock to be released.
read_unlock(&journal->j_state_lock);
current->journal_info = handle;
- lock_map_acquire(&handle->h_lockdep_map);
+ rwsem_acquire_read(&journal->j_trans_commit_map, 0, 0, _THIS_IP_);
jbd2_journal_free_transaction(new_transaction);
return 0;
}
-static struct lock_class_key jbd2_handle_key;
-
/* Allocate a new handle. This should probably be in a slab... */
static handle_t *new_handle(int nblocks)
{
handle->h_buffer_credits = nblocks;
handle->h_ref = 1;
- lockdep_init_map(&handle->h_lockdep_map, "jbd2_handle",
- &jbd2_handle_key, 0);
-
return handle;
}
if (need_to_start)
jbd2_log_start_commit(journal, tid);
- lock_map_release(&handle->h_lockdep_map);
+ rwsem_release(&journal->j_trans_commit_map, 1, _THIS_IP_);
handle->h_buffer_credits = nblocks;
ret = start_this_handle(journal, handle, gfp_mask);
return ret;
{
DEFINE_WAIT(wait);
+ jbd2_might_wait_for_commit(journal);
+
write_lock(&journal->j_state_lock);
++journal->j_barrier_count;
wake_up(&journal->j_wait_transaction_locked);
}
+ rwsem_release(&journal->j_trans_commit_map, 1, _THIS_IP_);
+
if (wait_for_commit)
err = jbd2_log_wait_commit(journal, tid);
- lock_map_release(&handle->h_lockdep_map);
-
if (handle->h_rsv_handle)
jbd2_journal_free_reserved(handle->h_rsv_handle);
free_and_exit:
unsigned long h_start_jiffies;
unsigned int h_requested_credits;
-
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
- struct lockdep_map h_lockdep_map;
-#endif
};
* @j_proc_entry: procfs entry for the jbd statistics directory
* @j_stats: Overall statistics
* @j_private: An opaque pointer to fs-private information.
+ * @j_trans_commit_map: Lockdep entity to track transaction commit dependencies
*/
struct journal_s
/* Precomputed journal UUID checksum for seeding other checksums */
__u32 j_csum_seed;
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ /*
+ * Lockdep entity to track transaction commit dependencies. Handles
+ * hold this "lock" for read, when we wait for commit, we acquire the
+ * "lock" for writing. This matches the properties of jbd2 journalling
+ * where the running transaction has to wait for all handles to be
+ * dropped to commit that transaction and also acquiring a handle may
+ * require transaction commit to finish.
+ */
+ struct lockdep_map j_trans_commit_map;
+#endif
};
+#define jbd2_might_wait_for_commit(j) \
+ do { \
+ rwsem_acquire(&j->j_trans_commit_map, 0, 0, _THIS_IP_); \
+ rwsem_release(&j->j_trans_commit_map, 1, _THIS_IP_); \
+ } while (0)
+
/* journal feature predicate functions */
#define JBD2_FEATURE_COMPAT_FUNCS(name, flagname) \
static inline bool jbd2_has_feature_##name(journal_t *j) \
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