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xfs: use xfs_defer_pending objects to recover intent items 

One thing I never quite got around to doing is porting the log intent
item recovery code to reconstruct the deferred pending work state.  As a
result, each intent item open codes xfs_defer_finish_one in its recovery
method, because that's what the EFI code did before xfs_defer.c even
existed.

This is a gross thing to have left unfixed -- if an EFI cannot proceed
due to busy extents, we end up creating separate new EFIs for each
unfinished work item, which is a change in behavior from what runtime
would have done.

Worse yet, Long Li pointed out that there's a UAF in the recovery code.
The ->commit_pass2 function adds the intent item to the AIL and drops
the refcount.  The one remaining refcount is now owned by the recovery
mechanism (aka the log intent items in the AIL) with the intent of
giving the refcount to the intent done item in the ->iop_recover
function.

However, if something fails later in recovery, xlog_recover_finish will
walk the recovered intent items in the AIL and release them.  If the CIL
hasn't been pushed before that point (which is possible since we don't
force the log until later) then the intent done release will try to free
its associated intent, which has already been freed.

This patch starts to address this mess by having the ->commit_pass2
functions recreate the xfs_defer_pending state.  The next few patches
will fix the recovery functions.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2023-11-22 10:23:23 -08:00
parent 07bcbdf020
commit 03f7767c9f
11 changed files with 157 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

105
fs/xfs/libxfs/xfs_defer.c
View File

@ -245,23 +245,53 @@ xfs_defer_create_intents(
return ret;
}
STATIC void
static inline void
xfs_defer_pending_abort(
struct xfs_mount *mp,
struct xfs_defer_pending *dfp)
{
const struct xfs_defer_op_type *ops = defer_op_types[dfp->dfp_type];
trace_xfs_defer_pending_abort(mp, dfp);
if (dfp->dfp_intent && !dfp->dfp_done) {
ops->abort_intent(dfp->dfp_intent);
dfp->dfp_intent = NULL;
}
}
static inline void
xfs_defer_pending_cancel_work(
struct xfs_mount *mp,
struct xfs_defer_pending *dfp)
{
const struct xfs_defer_op_type *ops = defer_op_types[dfp->dfp_type];
struct list_head *pwi;
struct list_head *n;
trace_xfs_defer_cancel_list(mp, dfp);
list_del(&dfp->dfp_list);
list_for_each_safe(pwi, n, &dfp->dfp_work) {
list_del(pwi);
dfp->dfp_count--;
trace_xfs_defer_cancel_item(mp, dfp, pwi);
ops->cancel_item(pwi);
}
ASSERT(dfp->dfp_count == 0);
kmem_cache_free(xfs_defer_pending_cache, dfp);
}
STATIC void
xfs_defer_pending_abort_list(
struct xfs_mount *mp,
struct list_head *dop_list)
{
struct xfs_defer_pending *dfp;
const struct xfs_defer_op_type *ops;
/* Abort intent items that don't have a done item. */
list_for_each_entry(dfp, dop_list, dfp_list) {
ops = defer_op_types[dfp->dfp_type];
trace_xfs_defer_pending_abort(mp, dfp);
if (dfp->dfp_intent && !dfp->dfp_done) {
ops->abort_intent(dfp->dfp_intent);
dfp->dfp_intent = NULL;
}
}
list_for_each_entry(dfp, dop_list, dfp_list)
xfs_defer_pending_abort(mp, dfp);
}
/* Abort all the intents that were committed. */
@ -271,7 +301,7 @@ xfs_defer_trans_abort(
struct list_head *dop_pending)
{
trace_xfs_defer_trans_abort(tp, _RET_IP_);
xfs_defer_pending_abort(tp->t_mountp, dop_pending);
xfs_defer_pending_abort_list(tp->t_mountp, dop_pending);
}
/*
@ -389,27 +419,13 @@ xfs_defer_cancel_list(
{
struct xfs_defer_pending *dfp;
struct xfs_defer_pending *pli;
struct list_head *pwi;
struct list_head *n;
const struct xfs_defer_op_type *ops;
/*
* Free the pending items. Caller should already have arranged
* for the intent items to be released.
*/
list_for_each_entry_safe(dfp, pli, dop_list, dfp_list) {
ops = defer_op_types[dfp->dfp_type];
trace_xfs_defer_cancel_list(mp, dfp);
list_del(&dfp->dfp_list);
list_for_each_safe(pwi, n, &dfp->dfp_work) {
list_del(pwi);
dfp->dfp_count--;
trace_xfs_defer_cancel_item(mp, dfp, pwi);
ops->cancel_item(pwi);
}
ASSERT(dfp->dfp_count == 0);
kmem_cache_free(xfs_defer_pending_cache, dfp);
}
list_for_each_entry_safe(dfp, pli, dop_list, dfp_list)
xfs_defer_pending_cancel_work(mp, dfp);
}
/*
@ -665,6 +681,39 @@ xfs_defer_add(
dfp->dfp_count++;
}
/*
* Create a pending deferred work item to replay the recovered intent item
* and add it to the list.
*/
void
xfs_defer_start_recovery(
struct xfs_log_item *lip,
enum xfs_defer_ops_type dfp_type,
struct list_head *r_dfops)
{
struct xfs_defer_pending *dfp;
dfp = kmem_cache_zalloc(xfs_defer_pending_cache,
GFP_NOFS | __GFP_NOFAIL);
dfp->dfp_type = dfp_type;
dfp->dfp_intent = lip;
INIT_LIST_HEAD(&dfp->dfp_work);
list_add_tail(&dfp->dfp_list, r_dfops);
}
/*
* Cancel a deferred work item created to recover a log intent item. @dfp
* will be freed after this function returns.
*/
void
xfs_defer_cancel_recovery(
struct xfs_mount *mp,
struct xfs_defer_pending *dfp)
{
xfs_defer_pending_abort(mp, dfp);
xfs_defer_pending_cancel_work(mp, dfp);
}
/*
* Move deferred ops from one transaction to another and reset the source to
* initial state. This is primarily used to carry state forward across
@ -769,7 +818,7 @@ xfs_defer_ops_capture_abort(
{
unsigned short i;
xfs_defer_pending_abort(mp, &dfc->dfc_dfops);
xfs_defer_pending_abort_list(mp, &dfc->dfc_dfops);
xfs_defer_cancel_list(mp, &dfc->dfc_dfops);
for (i = 0; i < dfc->dfc_held.dr_bufs; i++)

5
fs/xfs/libxfs/xfs_defer.h
View File

@ -125,6 +125,11 @@ void xfs_defer_ops_capture_abort(struct xfs_mount *mp,
struct xfs_defer_capture *d);
void xfs_defer_resources_rele(struct xfs_defer_resources *dres);
void xfs_defer_start_recovery(struct xfs_log_item *lip,
enum xfs_defer_ops_type dfp_type, struct list_head *r_dfops);
void xfs_defer_cancel_recovery(struct xfs_mount *mp,
struct xfs_defer_pending *dfp);
int __init xfs_defer_init_item_caches(void);
void xfs_defer_destroy_item_caches(void);

3
fs/xfs/libxfs/xfs_log_recover.h
View File

@ -153,4 +153,7 @@ xlog_recover_resv(const struct xfs_trans_res *r)
return ret;
}
void xlog_recover_intent_item(struct xlog *log, struct xfs_log_item *lip,
xfs_lsn_t lsn, unsigned int dfp_type);
#endif /* __XFS_LOG_RECOVER_H__ */

10
fs/xfs/xfs_attr_item.c
View File

@ -772,14 +772,8 @@ xlog_recover_attri_commit_pass2(
attrip = xfs_attri_init(mp, nv);
memcpy(&attrip->attri_format, attri_formatp, len);
/*
* The ATTRI has two references. One for the ATTRD and one for ATTRI to
* ensure it makes it into the AIL. Insert the ATTRI into the AIL
* directly and drop the ATTRI reference. Note that
* xfs_trans_ail_update() drops the AIL lock.
*/
xfs_trans_ail_insert(log->l_ailp, &attrip->attri_item, lsn);
xfs_attri_release(attrip);
xlog_recover_intent_item(log, &attrip->attri_item, lsn,
XFS_DEFER_OPS_TYPE_ATTR);
xfs_attri_log_nameval_put(nv);
return 0;
}

9
fs/xfs/xfs_bmap_item.c
View File

@ -681,12 +681,9 @@ xlog_recover_bui_commit_pass2(
buip = xfs_bui_init(mp);
xfs_bui_copy_format(&buip->bui_format, bui_formatp);
atomic_set(&buip->bui_next_extent, bui_formatp->bui_nextents);
/*
* Insert the intent into the AIL directly and drop one reference so
* that finishing or canceling the work will drop the other.
*/
xfs_trans_ail_insert(log->l_ailp, &buip->bui_item, lsn);
xfs_bui_release(buip);
xlog_recover_intent_item(log, &buip->bui_item, lsn,
XFS_DEFER_OPS_TYPE_BMAP);
return 0;
}

9
fs/xfs/xfs_extfree_item.c
View File

@ -820,12 +820,9 @@ xlog_recover_efi_commit_pass2(
return error;
}
atomic_set(&efip->efi_next_extent, efi_formatp->efi_nextents);
/*
* Insert the intent into the AIL directly and drop one reference so
* that finishing or canceling the work will drop the other.
*/
xfs_trans_ail_insert(log->l_ailp, &efip->efi_item, lsn);
xfs_efi_release(efip);
xlog_recover_intent_item(log, &efip->efi_item, lsn,
XFS_DEFER_OPS_TYPE_FREE);
return 0;
}

1
fs/xfs/xfs_log.c
View File

@ -1542,6 +1542,7 @@ xlog_alloc_log(
log->l_covered_state = XLOG_STATE_COVER_IDLE;
set_bit(XLOG_ACTIVE_RECOVERY, &log->l_opstate);
INIT_DELAYED_WORK(&log->l_work, xfs_log_worker);
INIT_LIST_HEAD(&log->r_dfops);
log->l_prev_block = -1;
/* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */

1
fs/xfs/xfs_log_priv.h
View File

@ -407,6 +407,7 @@ struct xlog {
long l_opstate; /* operational state */
uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */
struct list_head *l_buf_cancel_table;
struct list_head r_dfops; /* recovered log intent items */
int l_iclog_hsize; /* size of iclog header */
int l_iclog_heads; /* # of iclog header sectors */
uint l_sectBBsize; /* sector size in BBs (2^n) */

111
fs/xfs/xfs_log_recover.c
View File

@ -1723,30 +1723,24 @@ xlog_clear_stale_blocks(
*/
void
xlog_recover_release_intent(
struct xlog *log,
unsigned short intent_type,
uint64_t intent_id)
struct xlog *log,
unsigned short intent_type,
uint64_t intent_id)
{
struct xfs_ail_cursor cur;
struct xfs_log_item *lip;
struct xfs_ail *ailp = log->l_ailp;
struct xfs_defer_pending *dfp, *n;
list_for_each_entry_safe(dfp, n, &log->r_dfops, dfp_list) {
struct xfs_log_item *lip = dfp->dfp_intent;
spin_lock(&ailp->ail_lock);
for (lip = xfs_trans_ail_cursor_first(ailp, &cur, 0); lip != NULL;
lip = xfs_trans_ail_cursor_next(ailp, &cur)) {
if (lip->li_type != intent_type)
continue;
if (!lip->li_ops->iop_match(lip, intent_id))
continue;
spin_unlock(&ailp->ail_lock);
lip->li_ops->iop_release(lip);
spin_lock(&ailp->ail_lock);
break;
}
ASSERT(xlog_item_is_intent(lip));
xfs_trans_ail_cursor_done(&cur);
spin_unlock(&ailp->ail_lock);
xfs_defer_cancel_recovery(log->l_mp, dfp);
}
}
int
@ -1939,6 +1933,29 @@ xlog_buf_readahead(
xfs_buf_readahead(log->l_mp->m_ddev_targp, blkno, len, ops);
}
/*
* Create a deferred work structure for resuming and tracking the progress of a
* log intent item that was found during recovery.
*/
void
xlog_recover_intent_item(
struct xlog *log,
struct xfs_log_item *lip,
xfs_lsn_t lsn,
unsigned int dfp_type)
{
ASSERT(xlog_item_is_intent(lip));
xfs_defer_start_recovery(lip, dfp_type, &log->r_dfops);
/*
* Insert the intent into the AIL directly and drop one reference so
* that finishing or canceling the work will drop the other.
*/
xfs_trans_ail_insert(log->l_ailp, lip, lsn);
lip->li_ops->iop_unpin(lip, 0);
}
STATIC int
xlog_recover_items_pass2(
struct xlog *log,
@ -2533,29 +2550,22 @@ xlog_abort_defer_ops(
*/
STATIC int
xlog_recover_process_intents(
struct xlog *log)
struct xlog *log)
{
LIST_HEAD(capture_list);
struct xfs_ail_cursor cur;
struct xfs_log_item *lip;
struct xfs_ail *ailp;
int error = 0;
struct xfs_defer_pending *dfp, *n;
int error = 0;
#if defined(DEBUG) || defined(XFS_WARN)
xfs_lsn_t last_lsn;
#endif
xfs_lsn_t last_lsn;
ailp = log->l_ailp;
spin_lock(&ailp->ail_lock);
#if defined(DEBUG) || defined(XFS_WARN)
last_lsn = xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block);
#endif
for (lip = xfs_trans_ail_cursor_first(ailp, &cur, 0);
lip != NULL;
lip = xfs_trans_ail_cursor_next(ailp, &cur)) {
const struct xfs_item_ops *ops;
if (!xlog_item_is_intent(lip))
break;
list_for_each_entry_safe(dfp, n, &log->r_dfops, dfp_list) {
struct xfs_log_item *lip = dfp->dfp_intent;
const struct xfs_item_ops *ops = lip->li_ops;
ASSERT(xlog_item_is_intent(lip));
/*
* We should never see a redo item with a LSN higher than
@ -2573,19 +2583,22 @@ xlog_recover_process_intents(
* The recovery function can free the log item, so we must not
* access lip after it returns.
*/
spin_unlock(&ailp->ail_lock);
ops = lip->li_ops;
error = ops->iop_recover(lip, &capture_list);
spin_lock(&ailp->ail_lock);
if (error) {
trace_xlog_intent_recovery_failed(log->l_mp, error,
ops->iop_recover);
break;
}
}
xfs_trans_ail_cursor_done(&cur);
spin_unlock(&ailp->ail_lock);
/*
* XXX: @lip could have been freed, so detach the log item from
* the pending item before freeing the pending item. This does
* not fix the existing UAF bug that occurs if ->iop_recover
* fails after creating the intent done item.
*/
dfp->dfp_intent = NULL;
xfs_defer_cancel_recovery(log->l_mp, dfp);
}
if (error)
goto err;
@ -2606,27 +2619,15 @@ err:
*/
STATIC void
xlog_recover_cancel_intents(
struct xlog *log)
struct xlog *log)
{
struct xfs_log_item *lip;
struct xfs_ail_cursor cur;
struct xfs_ail *ailp;
struct xfs_defer_pending *dfp, *n;
ailp = log->l_ailp;
spin_lock(&ailp->ail_lock);
lip = xfs_trans_ail_cursor_first(ailp, &cur, 0);
while (lip != NULL) {
if (!xlog_item_is_intent(lip))
break;
list_for_each_entry_safe(dfp, n, &log->r_dfops, dfp_list) {
ASSERT(xlog_item_is_intent(dfp->dfp_intent));
spin_unlock(&ailp->ail_lock);
lip->li_ops->iop_release(lip);
spin_lock(&ailp->ail_lock);
lip = xfs_trans_ail_cursor_next(ailp, &cur);
xfs_defer_cancel_recovery(log->l_mp, dfp);
}
xfs_trans_ail_cursor_done(&cur);
spin_unlock(&ailp->ail_lock);
}
/*

9
fs/xfs/xfs_refcount_item.c
View File

@ -696,12 +696,9 @@ xlog_recover_cui_commit_pass2(
cuip = xfs_cui_init(mp, cui_formatp->cui_nextents);
xfs_cui_copy_format(&cuip->cui_format, cui_formatp);
atomic_set(&cuip->cui_next_extent, cui_formatp->cui_nextents);
/*
* Insert the intent into the AIL directly and drop one reference so
* that finishing or canceling the work will drop the other.
*/
xfs_trans_ail_insert(log->l_ailp, &cuip->cui_item, lsn);
xfs_cui_release(cuip);
xlog_recover_intent_item(log, &cuip->cui_item, lsn,
XFS_DEFER_OPS_TYPE_REFCOUNT);
return 0;
}

9
fs/xfs/xfs_rmap_item.c
View File

@ -702,12 +702,9 @@ xlog_recover_rui_commit_pass2(
ruip = xfs_rui_init(mp, rui_formatp->rui_nextents);
xfs_rui_copy_format(&ruip->rui_format, rui_formatp);
atomic_set(&ruip->rui_next_extent, rui_formatp->rui_nextents);
/*
* Insert the intent into the AIL directly and drop one reference so
* that finishing or canceling the work will drop the other.
*/
xfs_trans_ail_insert(log->l_ailp, &ruip->rui_item, lsn);
xfs_rui_release(ruip);
xlog_recover_intent_item(log, &ruip->rui_item, lsn,
XFS_DEFER_OPS_TYPE_RMAP);
return 0;
}