The patch titled
hfs: handle more on-disk corruptions without oopsing
has been removed from the -mm tree. Its filename was
hfs-handle-more-on-disk-corruptions-without-oopsing.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: hfs: handle more on-disk corruptions without oopsing
From: Eric Sandeen <sandeen@xxxxxxxxxx>
hfs seems prone to bad things when it encounters on disk corruption. Many
values are read from disk, and used as lengths to memcpy, as an example.
This patch fixes up several of these problematic cases.
o sanity check the on-disk maximum key lengths on mount
(these are set to a defined value at mkfs time and shouldn't differ)
o check on-disk node keylens against the maximum key length for each tree
o fix hfs_btree_open so that going out via free_tree: doesn't wind
up in hfs_releasepage, which wants to follow the very pointer
we were trying to set up:
HFS_SB(sb)->cat_tree = hfs_btree_open()
...
failure gets to hfs_releasepage and tries
to follow HFS_SB(sb)->cat_tree
Tested with the fsfuzzer; it survives more than it used to.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Cc: Roman Zippel <zippel@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/hfs/bfind.c | 12 ++++++++++++
fs/hfs/brec.c | 15 +++++++++++++--
fs/hfs/btree.c | 13 ++++++++++++-
fs/hfs/hfs.h | 5 +++++
4 files changed, 42 insertions(+), 3 deletions(-)
diff -puN fs/hfs/bfind.c~hfs-handle-more-on-disk-corruptions-without-oopsing fs/hfs/bfind.c
--- a/fs/hfs/bfind.c~hfs-handle-more-on-disk-corruptions-without-oopsing
+++ a/fs/hfs/bfind.c
@@ -52,6 +52,10 @@ int __hfs_brec_find(struct hfs_bnode *bn
rec = (e + b) / 2;
len = hfs_brec_lenoff(bnode, rec, &off);
keylen = hfs_brec_keylen(bnode, rec);
+ if (keylen == HFS_BAD_KEYLEN) {
+ res = -EINVAL;
+ goto done;
+ }
hfs_bnode_read(bnode, fd->key, off, keylen);
cmpval = bnode->tree->keycmp(fd->key, fd->search_key);
if (!cmpval) {
@@ -67,6 +71,10 @@ int __hfs_brec_find(struct hfs_bnode *bn
if (rec != e && e >= 0) {
len = hfs_brec_lenoff(bnode, e, &off);
keylen = hfs_brec_keylen(bnode, e);
+ if (keylen == HFS_BAD_KEYLEN) {
+ res = -EINVAL;
+ goto done;
+ }
hfs_bnode_read(bnode, fd->key, off, keylen);
}
done:
@@ -198,6 +206,10 @@ int hfs_brec_goto(struct hfs_find_data *
len = hfs_brec_lenoff(bnode, fd->record, &off);
keylen = hfs_brec_keylen(bnode, fd->record);
+ if (keylen == HFS_BAD_KEYLEN) {
+ res = -EINVAL;
+ goto out;
+ }
fd->keyoffset = off;
fd->keylength = keylen;
fd->entryoffset = off + keylen;
diff -puN fs/hfs/brec.c~hfs-handle-more-on-disk-corruptions-without-oopsing fs/hfs/brec.c
--- a/fs/hfs/brec.c~hfs-handle-more-on-disk-corruptions-without-oopsing
+++ a/fs/hfs/brec.c
@@ -44,10 +44,21 @@ u16 hfs_brec_keylen(struct hfs_bnode *no
recoff = hfs_bnode_read_u16(node, node->tree->node_size - (rec + 1) * 2);
if (!recoff)
return 0;
- if (node->tree->attributes & HFS_TREE_BIGKEYS)
+ if (node->tree->attributes & HFS_TREE_BIGKEYS) {
retval = hfs_bnode_read_u16(node, recoff) + 2;
- else
+ if (retval > node->tree->max_key_len + 2) {
+ printk(KERN_ERR "hfs: keylen %d too large\n",
+ retval);
+ retval = HFS_BAD_KEYLEN;
+ }
+ } else {
retval = (hfs_bnode_read_u8(node, recoff) | 1) + 1;
+ if (retval > node->tree->max_key_len + 1) {
+ printk(KERN_ERR "hfs: keylen %d too large\n",
+ retval);
+ retval = HFS_BAD_KEYLEN;
+ }
+ }
}
return retval;
}
diff -puN fs/hfs/btree.c~hfs-handle-more-on-disk-corruptions-without-oopsing fs/hfs/btree.c
--- a/fs/hfs/btree.c~hfs-handle-more-on-disk-corruptions-without-oopsing
+++ a/fs/hfs/btree.c
@@ -81,6 +81,17 @@ struct hfs_btree *hfs_btree_open(struct
goto fail_page;
if (!tree->node_count)
goto fail_page;
+ if ((id == HFS_EXT_CNID) && (tree->max_key_len != HFS_MAX_EXT_KEYLEN)) {
+ printk(KERN_ERR "hfs: invalid extent max_key_len %d\n",
+ tree->max_key_len);
+ goto fail_page;
+ }
+ if ((id == HFS_CAT_CNID) && (tree->max_key_len != HFS_MAX_CAT_KEYLEN)) {
+ printk(KERN_ERR "hfs: invalid catalog max_key_len %d\n",
+ tree->max_key_len);
+ goto fail_page;
+ }
+
tree->node_size_shift = ffs(size) - 1;
tree->pages_per_bnode = (tree->node_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
@@ -89,9 +100,9 @@ struct hfs_btree *hfs_btree_open(struct
return tree;
fail_page:
- tree->inode->i_mapping->a_ops = &hfs_aops;
page_cache_release(page);
free_tree:
+ tree->inode->i_mapping->a_ops = &hfs_aops;
iput(tree->inode);
kfree(tree);
return NULL;
diff -puN fs/hfs/hfs.h~hfs-handle-more-on-disk-corruptions-without-oopsing fs/hfs/hfs.h
--- a/fs/hfs/hfs.h~hfs-handle-more-on-disk-corruptions-without-oopsing
+++ a/fs/hfs/hfs.h
@@ -28,6 +28,8 @@
#define HFS_MAX_NAMELEN 128
#define HFS_MAX_VALENCE 32767U
+#define HFS_BAD_KEYLEN 0xFF
+
/* Meanings of the drAtrb field of the MDB,
* Reference: _Inside Macintosh: Files_ p. 2-61
*/
@@ -167,6 +169,9 @@ typedef union hfs_btree_key {
struct hfs_ext_key ext;
} hfs_btree_key;
+#define HFS_MAX_CAT_KEYLEN (sizeof(struct hfs_cat_key) - sizeof(u8))
+#define HFS_MAX_EXT_KEYLEN (sizeof(struct hfs_ext_key) - sizeof(u8))
+
typedef union hfs_btree_key btree_key;
struct hfs_extent {
_
Patches currently in -mm which might be from sandeen@xxxxxxxxxx are
origin.patch
git-kbuild.patch
ext2-change-the-default-behaviour-on-error.patch
export-iov_shorten-for-ext4s-use.patch
export-iov_shorten-for-ext4s-use-fix.patch
ecryptfs-make-show_options-reflect-actual-mount-options.patch
ecryptfs-make-show_options-reflect-actual-mount-options-fix.patch
ecryptfs-remove-debug-as-mount-option-and-warn-if-set-via-modprobe.patch
ecryptfs-check-for-existing-key_tfm-at-mount-time.patch
ext4-mm-ext4_store_maxbytes_for_bitmaped_files-warning-fix.patch
ext3-change-the-default-behaviour-on-error.patch
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