forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
18 changed files
with
263 additions
and
301 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| obj-$(CONFIG_FS_ENCRYPTION) += fscrypto.o | ||
|
|
||
| fscrypto-y := crypto.o fname.o policy.o keyinfo.o | ||
| fscrypto-$(CONFIG_BLOCK) += bio.o |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| /* | ||
| * This contains encryption functions for per-file encryption. | ||
| * | ||
| * Copyright (C) 2015, Google, Inc. | ||
| * Copyright (C) 2015, Motorola Mobility | ||
| * | ||
| * Written by Michael Halcrow, 2014. | ||
| * | ||
| * Filename encryption additions | ||
| * Uday Savagaonkar, 2014 | ||
| * Encryption policy handling additions | ||
| * Ildar Muslukhov, 2014 | ||
| * Add fscrypt_pullback_bio_page() | ||
| * Jaegeuk Kim, 2015. | ||
| * | ||
| * 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 <linux/pagemap.h> | ||
| #include <linux/module.h> | ||
| #include <linux/bio.h> | ||
| #include <linux/namei.h> | ||
| #include "fscrypt_private.h" | ||
|
|
||
| /* | ||
| * Call fscrypt_decrypt_page on every single page, reusing the encryption | ||
| * context. | ||
| */ | ||
| static void completion_pages(struct work_struct *work) | ||
| { | ||
| struct fscrypt_ctx *ctx = | ||
| container_of(work, struct fscrypt_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 = fscrypt_decrypt_page(page->mapping->host, page, | ||
| PAGE_SIZE, 0, page->index); | ||
|
|
||
| if (ret) { | ||
| WARN_ON_ONCE(1); | ||
| SetPageError(page); | ||
| } else { | ||
| SetPageUptodate(page); | ||
| } | ||
| unlock_page(page); | ||
| } | ||
| fscrypt_release_ctx(ctx); | ||
| bio_put(bio); | ||
| } | ||
|
|
||
| void fscrypt_decrypt_bio_pages(struct fscrypt_ctx *ctx, struct bio *bio) | ||
| { | ||
| INIT_WORK(&ctx->r.work, completion_pages); | ||
| ctx->r.bio = bio; | ||
| queue_work(fscrypt_read_workqueue, &ctx->r.work); | ||
| } | ||
| EXPORT_SYMBOL(fscrypt_decrypt_bio_pages); | ||
|
|
||
| void fscrypt_pullback_bio_page(struct page **page, bool restore) | ||
| { | ||
| struct fscrypt_ctx *ctx; | ||
| struct page *bounce_page; | ||
|
|
||
| /* The bounce data pages are unmapped. */ | ||
| if ((*page)->mapping) | ||
| return; | ||
|
|
||
| /* The bounce data page is unmapped. */ | ||
| bounce_page = *page; | ||
| ctx = (struct fscrypt_ctx *)page_private(bounce_page); | ||
|
|
||
| /* restore control page */ | ||
| *page = ctx->w.control_page; | ||
|
|
||
| if (restore) | ||
| fscrypt_restore_control_page(bounce_page); | ||
| } | ||
| EXPORT_SYMBOL(fscrypt_pullback_bio_page); | ||
|
|
||
| int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk, | ||
| sector_t pblk, unsigned int len) | ||
| { | ||
| struct fscrypt_ctx *ctx; | ||
| struct page *ciphertext_page = NULL; | ||
| struct bio *bio; | ||
| int ret, err = 0; | ||
|
|
||
| BUG_ON(inode->i_sb->s_blocksize != PAGE_SIZE); | ||
|
|
||
| ctx = fscrypt_get_ctx(inode, GFP_NOFS); | ||
| if (IS_ERR(ctx)) | ||
| return PTR_ERR(ctx); | ||
|
|
||
| ciphertext_page = fscrypt_alloc_bounce_page(ctx, GFP_NOWAIT); | ||
| if (IS_ERR(ciphertext_page)) { | ||
| err = PTR_ERR(ciphertext_page); | ||
| goto errout; | ||
| } | ||
|
|
||
| while (len--) { | ||
| err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk, | ||
| ZERO_PAGE(0), ciphertext_page, | ||
| PAGE_SIZE, 0, 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! */ | ||
| 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: | ||
| fscrypt_release_ctx(ctx); | ||
| return err; | ||
| } | ||
| EXPORT_SYMBOL(fscrypt_zeroout_range); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.