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ZFS send fails to dump objects larger than 128PiB

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When dumping objects larger than 128PiB it's possible for do_dump() to
miscalculate the FREE_RECORD offset due to an integer overflow
condition: this prevents the receiving end from correctly restoring
the dumped object.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #6760
This commit is contained in:
LOLi
2017-10-27 01:58:38 +02:00
committed by Brian Behlendorf
parent 88f9c9396b
commit ee45fbd894
6 changed files with 109 additions and 19 deletions
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module/zfs/dmu_send.c
+19 -14
View File
@@ -223,9 +223,6 @@ dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
(object == dsp->dsa_last_data_object &&
offset > dsp->dsa_last_data_offset));
if (length != -1ULL && offset + length < offset)
length = -1ULL;
/*
* If there is a pending op, but it's not PENDING_FREE, push it out,
* since free block aggregation can only be done for blocks of the
@@ -242,19 +239,22 @@ dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
if (dsp->dsa_pending_op == PENDING_FREE) {
/*
* There should never be a PENDING_FREE if length is -1
* (because dump_dnode is the only place where this
* function is called with a -1, and only after flushing
* any pending record).
* There should never be a PENDING_FREE if length is
* DMU_OBJECT_END (because dump_dnode is the only place where
* this function is called with a DMU_OBJECT_END, and only after
* flushing any pending record).
*/
ASSERT(length != -1ULL);
ASSERT(length != DMU_OBJECT_END);
/*
* Check to see whether this free block can be aggregated
* with pending one.
*/
if (drrf->drr_object == object && drrf->drr_offset +
drrf->drr_length == offset) {
drrf->drr_length += length;
if (offset + length < offset)
drrf->drr_length = DMU_OBJECT_END;
else
drrf->drr_length += length;
return (0);
} else {
/* not a continuation. Push out pending record */
@@ -268,9 +268,12 @@ dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
dsp->dsa_drr->drr_type = DRR_FREE;
drrf->drr_object = object;
drrf->drr_offset = offset;
drrf->drr_length = length;
if (offset + length < offset)
drrf->drr_length = DMU_OBJECT_END;
else
drrf->drr_length = length;
drrf->drr_toguid = dsp->dsa_toguid;
if (length == -1ULL) {
if (length == DMU_OBJECT_END) {
if (dump_record(dsp, NULL, 0) != 0)
return (SET_ERROR(EINTR));
} else {
@@ -587,7 +590,7 @@ dump_dnode(dmu_sendarg_t *dsp, const blkptr_t *bp, uint64_t object,
/* Free anything past the end of the file. */
if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
(dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0)
(dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), DMU_OBJECT_END) != 0)
return (SET_ERROR(EINTR));
if (dsp->dsa_err != 0)
return (SET_ERROR(EINTR));
@@ -771,7 +774,9 @@ do_dump(dmu_sendarg_t *dsa, struct send_block_record *data)
} else if (BP_IS_HOLE(bp)) {
uint64_t span = BP_SPAN(dblkszsec, indblkshift, zb->zb_level);
uint64_t offset = zb->zb_blkid * span;
err = dump_free(dsa, zb->zb_object, offset, span);
/* Don't dump free records for offsets > DMU_OBJECT_END */
if (zb->zb_blkid == 0 || span <= DMU_OBJECT_END / zb->zb_blkid)
err = dump_free(dsa, zb->zb_object, offset, span);
} else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
return (0);
} else if (type == DMU_OT_DNODE) {
@@ -2860,7 +2865,7 @@ receive_free(struct receive_writer_arg *rwa, struct drr_free *drrf)
{
int err;
if (drrf->drr_length != -1ULL &&
if (drrf->drr_length != DMU_OBJECT_END &&
drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
return (SET_ERROR(EINVAL));