[PATCH AUTOSEL 6.10 2/7] f2fs: fix to do sanity check on blocks for inline_data inode

Sasha Levin
2024-07-30T12:45:23Z

From: Chao Yu <chao@kernel.org>

[ Upstream commit c240c87bcd44a1a2375fc8ef8c645d1f1fe76466 ]

inode can be fuzzed, so it can has F2FS_INLINE_DATA flag and valid
i_blocks/i_nid value, this patch supports to do extra sanity check
to detect such corrupted state.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/f2fs/f2fs.h | 2 +-
fs/f2fs/inline.c | 20 +++++++++++++++++++-
fs/f2fs/inode.c | 2 +-
3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 1974b6aff397c..f463961b497c4 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -4149,7 +4149,7 @@ extern struct kmem_cache *f2fs_inode_entry_slab;
* inline.c
*/
bool f2fs_may_inline_data(struct inode *inode);
-bool f2fs_sanity_check_inline_data(struct inode *inode);
+bool f2fs_sanity_check_inline_data(struct inode *inode, struct page *ipage);
bool f2fs_may_inline_dentry(struct inode *inode);
void f2fs_do_read_inline_data(struct folio *folio, struct page *ipage);
void f2fs_truncate_inline_inode(struct inode *inode,
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 7638d0d7b7eed..0203c3baabb66 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -33,11 +33,29 @@ bool f2fs_may_inline_data(struct inode *inode)
return !f2fs_post_read_required(inode);
}

-bool f2fs_sanity_check_inline_data(struct inode *inode)
+static bool inode_has_blocks(struct inode *inode, struct page *ipage)
+{
+ struct f2fs_inode *ri = F2FS_INODE(ipage);
+ int i;
+
+ if (F2FS_HAS_BLOCKS(inode))
+ return true;
+
+ for (i = 0; i < DEF_NIDS_PER_INODE; i++) {
+ if (ri->i_nid[i])
+ return true;
+ }
+ return false;
+}
+
+bool f2fs_sanity_check_inline_data(struct inode *inode, struct page *ipage)
{
if (!f2fs_has_inline_data(inode))
return false;

+ if (inode_has_blocks(inode, ipage))
+ return false;
+
if (!support_inline_data(inode))
return true;

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 005dde72aff3d..33b2778d54525 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -344,7 +344,7 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
}
}

- if (f2fs_sanity_check_inline_data(inode)) {
+ if (f2fs_sanity_check_inline_data(inode, node_page)) {
f2fs_warn(sbi, "%s: inode (ino=%lx, mode=%u) should not have inline_data, run fsck to fix",
__func__, inode->i_ino, inode->i_mode);
return false;
--
2.43.0