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f2fs: avoid wrong decrypted data from disk

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[ Upstream commit 0ded69f632bb717be9aeea3ae74e29050fcb060c ]

1. Create a file in an encrypted directory
2. Do GC & drop caches
3. Read stale data before its bio for metapage was not issued yet

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jaegeuk Kim 2018-08-22 21:18:00 -07:00 committed by Greg Kroah-Hartman
parent b6410b95c2
commit 23ad83c399
4 changed files with 17 additions and 12 deletions
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18
fs/f2fs/data.c
View file

@ -575,9 +575,6 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
ctx->bio = bio;
ctx->enabled_steps = post_read_steps;
bio->bi_private = ctx;
/* wait the page to be moved by cleaning */
f2fs_wait_on_block_writeback(sbi, blkaddr);
}
return bio;
@ -592,6 +589,9 @@ static int f2fs_submit_page_read(struct inode *inode, struct page *page,
if (IS_ERR(bio))
return PTR_ERR(bio);
/* wait for GCed page writeback via META_MAPPING */
f2fs_wait_on_block_writeback(inode, blkaddr);
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
bio_put(bio);
return -EFAULT;
@ -1569,6 +1569,12 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
}
}
/*
* If the page is under writeback, we need to wait for
* its completion to see the correct decrypted data.
*/
f2fs_wait_on_block_writeback(inode, block_nr);
if (bio_add_page(bio, page, blocksize, 0) < blocksize)
goto submit_and_realloc;
@ -1637,7 +1643,7 @@ static int encrypt_one_page(struct f2fs_io_info *fio)
return 0;
/* wait for GCed page writeback via META_MAPPING */
f2fs_wait_on_block_writeback(fio->sbi, fio->old_blkaddr);
f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
retry_encrypt:
fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page,
@ -2402,10 +2408,6 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
f2fs_wait_on_page_writeback(page, DATA, false);
/* wait for GCed page writeback via META_MAPPING */
if (f2fs_post_read_required(inode))
f2fs_wait_on_block_writeback(sbi, blkaddr);
if (len == PAGE_SIZE || PageUptodate(page))
return 0;

2
fs/f2fs/f2fs.h
View file

@ -2973,7 +2973,7 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
struct f2fs_io_info *fio, bool add_list);
void f2fs_wait_on_page_writeback(struct page *page,
enum page_type type, bool ordered);
void f2fs_wait_on_block_writeback(struct f2fs_sb_info *sbi, block_t blkaddr);
void f2fs_wait_on_block_writeback(struct inode *inode, block_t blkaddr);
void f2fs_write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk);
void f2fs_write_node_summaries(struct f2fs_sb_info *sbi, block_t start_blk);
int f2fs_lookup_journal_in_cursum(struct f2fs_journal *journal, int type,

3
fs/f2fs/file.c
View file

@ -112,8 +112,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
f2fs_wait_on_page_writeback(page, DATA, false);
/* wait for GCed page writeback via META_MAPPING */
if (f2fs_post_read_required(inode))
f2fs_wait_on_block_writeback(sbi, dn.data_blkaddr);
f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
out_sem:
up_read(&F2FS_I(inode)->i_mmap_sem);

6
fs/f2fs/segment.c
View file

@ -3214,10 +3214,14 @@ void f2fs_wait_on_page_writeback(struct page *page,
}
}
void f2fs_wait_on_block_writeback(struct f2fs_sb_info *sbi, block_t blkaddr)
void f2fs_wait_on_block_writeback(struct inode *inode, block_t blkaddr)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct page *cpage;
if (!f2fs_post_read_required(inode))
return;
if (!is_valid_data_blkaddr(sbi, blkaddr))
return;