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Subject[PATCH AUTOSEL 4.19 088/205] f2fs: avoid wrong decrypted data from disk
Date
From: Jaegeuk Kim <jaegeuk@kernel.org>

[ 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>
---
fs/f2fs/data.c | 18 ++++++++++--------
fs/f2fs/f2fs.h | 2 +-
fs/f2fs/file.c | 3 +--
fs/f2fs/segment.c | 6 +++++-
4 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9511466bc7857..c61beaedf0789 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -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 @@ submit_and_realloc:
}
}

+ /*
+ * 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 @@ repeat:

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;

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index fb216488d67a9..6d361c8c61306 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -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,
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 8d1eb8dec6058..6972c6d7c3893 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -112,8 +112,7 @@ mapped:
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);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 10d5dcdb34be6..d78009694f3fd 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -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;

--
2.20.1
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