This patch adds check to validate the extent entries along
with extent headers. Should handle crash with corrupt filesystem.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
fs/ext4/extents.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++------
1 files changed, 71 insertions(+), 10 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index e2eab19..503c97c 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -301,7 +301,64 @@ ext4_ext_max_entries(struct inode *inode, int depth)
return max;
}
-static int __ext4_ext_check_header(const char *function, struct inode *inode,
+static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
+{
+ ext4_fsblk_t block = ext_pblock(ext);
+ int len = ext4_ext_get_actual_len(ext);
+ struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
+ if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
+ ((block + len) > ext4_blocks_count(es))))
+ return 0;
+ else
+ return 1;
+}
+
+static int ext4_valid_extent_idx(struct inode *inode,
+ struct ext4_extent_idx *ext_idx)
+{
+ ext4_fsblk_t block = idx_pblock(ext_idx);
+ struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
+ if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
+ (block > ext4_blocks_count(es))))
+ return 0;
+ else
+ return 1;
+}
+
+static int ext4_valid_extent_entries(struct inode *inode,
+ struct ext4_extent_header *eh,
+ int depth)
+{
+ struct ext4_extent *ext;
+ struct ext4_extent_idx *ext_idx;
+ unsigned short entries;
+ if (eh->eh_entries == 0)
+ return 1;
+
+ entries = le16_to_cpu(eh->eh_entries);
+
+ if (depth == 0) {
+ /* leaf entries */
+ ext = EXT_FIRST_EXTENT(eh);
+ while (entries) {
+ if (!ext4_valid_extent(inode, ext))
+ return 0;
+ ext++;
+ entries--;
+ }
+ } else {
+ ext_idx = EXT_FIRST_INDEX(eh);
+ while (entries) {
+ if (!ext4_valid_extent_idx(inode, ext_idx))
+ return 0;
+ ext_idx++;
+ entries--;
+ }
+ }
+ return 1;
+}
+
+static int __ext4_ext_check(const char *function, struct inode *inode,
struct ext4_extent_header *eh,
int depth)
{
@@ -329,11 +386,15 @@ static int __ext4_ext_check_header(const char *function, struct inode *inode,
error_msg = "invalid eh_entries";
goto corrupted;
}
+ if (!ext4_valid_extent_entries(inode, eh, depth)) {
+ error_msg = "invalid extent entries";
+ goto corrupted;
+ }
return 0;
corrupted:
ext4_error(inode->i_sb, function,
- "bad header in inode #%lu: %s - magic %x, "
+ "bad header/extent in inode #%lu: %s - magic %x, "
"entries %u, max %u(%u), depth %u(%u)",
inode->i_ino, error_msg, le16_to_cpu(eh->eh_magic),
le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max),
@@ -342,8 +403,8 @@ corrupted:
return -EIO;
}
-#define ext4_ext_check_header(inode, eh, depth) \
- __ext4_ext_check_header(__func__, inode, eh, depth)
+#define ext4_ext_check(inode, eh, depth) \
+ __ext4_ext_check(__func__, inode, eh, depth)
#ifdef EXT_DEBUG
static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
@@ -547,7 +608,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
eh = ext_inode_hdr(inode);
depth = ext_depth(inode);
- if (ext4_ext_check_header(inode, eh, depth))
+ if (ext4_ext_check(inode, eh, depth))
return ERR_PTR(-EIO);
@@ -584,7 +645,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
path[ppos].p_hdr = eh;
i--;
- if (ext4_ext_check_header(inode, eh, i))
+ if (ext4_ext_check(inode, eh, i))
goto err;
}
@@ -1179,7 +1240,7 @@ got_index:
if (bh == NULL)
return -EIO;
eh = ext_block_hdr(bh);
- if (ext4_ext_check_header(inode, eh, depth)) {
+ if (ext4_ext_check(inode, eh, depth)) {
put_bh(bh);
return -EIO;
}
@@ -1192,7 +1253,7 @@ got_index:
if (bh == NULL)
return -EIO;
eh = ext_block_hdr(bh);
- if (ext4_ext_check_header(inode, eh, path->p_depth - depth)) {
+ if (ext4_ext_check(inode, eh, path->p_depth - depth)) {
put_bh(bh);
return -EIO;
}
@@ -2135,7 +2196,7 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start)
return -ENOMEM;
}
path[0].p_hdr = ext_inode_hdr(inode);
- if (ext4_ext_check_header(inode, path[0].p_hdr, depth)) {
+ if (ext4_ext_check(inode, path[0].p_hdr, depth)) {
err = -EIO;
goto out;
}
@@ -2189,7 +2250,7 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start)
err = -EIO;
break;
}
- if (ext4_ext_check_header(inode, ext_block_hdr(bh),
+ if (ext4_ext_check(inode, ext_block_hdr(bh),
depth - i - 1)) {
err = -EIO;
break;
--
tg: (ae1a25d..) extent_validate (depends on: master)
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