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Decryption error handling improvements

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Currently, the decryption and block authentication code in
the ZIO / ARC layers is a bit inconsistent with regards to
the ereports that are produces and the error codes that are
passed to calling functions. This patch ensures that all of
these errors (which begin as ECKSUM) are converted to EIO
before they leave the ZIO or ARC layer and that ereports
are correctly generated on each decryption / authentication
failure.

In addition, this patch fixes a bug in zio_decrypt() where
ECKSUM never gets written to zio->io_error.

Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #7372
This commit is contained in:
Tom Caputi
2018-03-31 14:12:51 -04:00
committed by Brian Behlendorf
parent 4515b1d01c
commit a2c2ed1bd4
9 changed files with 68 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/arc.c
+30 -4
View File
@@ -2260,14 +2260,27 @@ byteswap:
* callers.
*/
int
arc_untransform(arc_buf_t *buf, spa_t *spa, uint64_t dsobj, boolean_t in_place)
arc_untransform(arc_buf_t *buf, spa_t *spa, const zbookmark_phys_t *zb,
boolean_t in_place)
{
int ret;
arc_fill_flags_t flags = 0;
if (in_place)
flags |= ARC_FILL_IN_PLACE;
return (arc_buf_fill(buf, spa, dsobj, flags));
ret = arc_buf_fill(buf, spa, zb->zb_objset, flags);
if (ret == ECKSUM) {
/*
* Convert authentication and decryption errors to EIO
* (and generate an ereport) before leaving the ARC.
*/
ret = SET_ERROR(EIO);
zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION,
spa, NULL, zb, NULL, 0, 0);
}
return (ret);
}
/*
@@ -5810,7 +5823,8 @@ arc_read_done(zio_t *zio)
* Assert non-speculative zios didn't fail because an
* encryption key wasn't loaded
*/
ASSERT((zio->io_flags & ZIO_FLAG_SPECULATIVE) || error == 0);
ASSERT((zio->io_flags & ZIO_FLAG_SPECULATIVE) ||
error != ENOENT);
/*
* If we failed to decrypt, report an error now (as the zio
@@ -6033,12 +6047,24 @@ top:
rc = arc_buf_alloc_impl(hdr, spa, zb->zb_objset,
private, encrypted_read, compressed_read,
noauth_read, B_TRUE, &buf);
if (rc == ECKSUM) {
/*
* Convert authentication and decryption errors
* to EIO (and generate an ereport) before
* leaving the ARC.
*/
rc = SET_ERROR(EIO);
zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION,
spa, NULL, zb, NULL, 0, 0);
}
if (rc != 0) {
arc_buf_destroy(buf, private);
buf = NULL;
}
ASSERT((zio_flags & ZIO_FLAG_SPECULATIVE) || rc == 0);
/* assert any errors weren't due to unloaded keys */
ASSERT((zio_flags & ZIO_FLAG_SPECULATIVE) ||
rc != ENOENT);
} else if (*arc_flags & ARC_FLAG_PREFETCH &&
refcount_count(&hdr->b_l1hdr.b_refcnt) == 0) {
arc_hdr_set_flags(hdr, ARC_FLAG_PREFETCH);
module/zfs/dbuf.c
+14 -6
View File
@@ -1194,8 +1194,10 @@ dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
DMU_OT_IS_ENCRYPTED(dn->dn_bonustype) &&
(flags & DB_RF_NO_DECRYPT) == 0 &&
arc_is_encrypted(dn_buf)) {
SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
DMU_META_DNODE_OBJECT, 0, dn->dn_dbuf->db_blkid);
err = arc_untransform(dn_buf, dn->dn_objset->os_spa,
dmu_objset_id(dn->dn_objset), B_TRUE);
&zb, B_TRUE);
if (err != 0) {
DB_DNODE_EXIT(db);
mutex_exit(&db->db_mtx);
@@ -1264,8 +1266,7 @@ dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
if (DBUF_IS_L2CACHEABLE(db))
aflags |= ARC_FLAG_L2CACHE;
SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ?
db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET,
SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
db->db.db_object, db->db_level, db->db_blkid);
/*
@@ -1409,9 +1410,12 @@ dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
if (db->db_buf != NULL && (flags & DB_RF_NO_DECRYPT) == 0 &&
(arc_is_encrypted(db->db_buf) ||
arc_get_compression(db->db_buf) != ZIO_COMPRESS_OFF)) {
zbookmark_phys_t zb;
SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
db->db.db_object, db->db_level, db->db_blkid);
dbuf_fix_old_data(db, spa_syncing_txg(spa));
err = arc_untransform(db->db_buf, spa,
dmu_objset_id(db->db_objset), B_FALSE);
err = arc_untransform(db->db_buf, spa, &zb, B_FALSE);
dbuf_set_data(db, db->db_buf);
}
mutex_exit(&db->db_mtx);
@@ -3458,6 +3462,8 @@ dbuf_check_crypt(dbuf_dirty_record_t *dr)
ASSERT(MUTEX_HELD(&db->db_mtx));
if (!dr->dt.dl.dr_raw && arc_is_encrypted(db->db_buf)) {
zbookmark_phys_t zb;
/*
* Unfortunately, there is currently no mechanism for
* syncing context to handle decryption errors. An error
@@ -3465,8 +3471,10 @@ dbuf_check_crypt(dbuf_dirty_record_t *dr)
* changed a dnode block and updated the associated
* checksums going up the block tree.
*/
SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
db->db.db_object, db->db_level, db->db_blkid);
err = arc_untransform(db->db_buf, db->db_objset->os_spa,
dmu_objset_id(db->db_objset), B_TRUE);
&zb, B_TRUE);
if (err)
panic("Invalid dnode block MAC");
} else if (dr->dt.dl.dr_raw) {
module/zfs/dmu_objset.c
+5 -1
View File
@@ -686,8 +686,12 @@ dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type,
/* if we are decrypting, we can now check MACs in os->os_phys_buf */
if (decrypt && arc_is_unauthenticated((*osp)->os_phys_buf)) {
zbookmark_phys_t zb;
SET_BOOKMARK(&zb, ds->ds_object, ZB_ROOT_OBJECT,
ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
err = arc_untransform((*osp)->os_phys_buf, (*osp)->os_spa,
ds->ds_object, B_FALSE);
&zb, B_FALSE);
if (err != 0)
return (err);
module/zfs/dmu_send.c
+5 -1
View File
@@ -983,8 +983,12 @@ dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *to_ds,
*/
if (!rawok && os->os_encrypted &&
arc_is_unauthenticated(os->os_phys_buf)) {
zbookmark_phys_t zb;
SET_BOOKMARK(&zb, to_ds->ds_object, ZB_ROOT_OBJECT,
ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
err = arc_untransform(os->os_phys_buf, os->os_spa,
to_ds->ds_object, B_FALSE);
&zb, B_FALSE);
if (err != 0) {
dsl_pool_rele(dp, tag);
return (err);
module/zfs/zfs_fm.c
+5 -4
View File
@@ -142,7 +142,7 @@ zfs_is_ratelimiting_event(const char *subclass, vdev_t *vd)
static void
zfs_ereport_start(nvlist_t **ereport_out, nvlist_t **detector_out,
const char *subclass, spa_t *spa, vdev_t *vd, zbookmark_phys_t *zb,
const char *subclass, spa_t *spa, vdev_t *vd, const zbookmark_phys_t *zb,
zio_t *zio, uint64_t stateoroffset, uint64_t size)
{
nvlist_t *ereport, *detector;
@@ -767,7 +767,8 @@ annotate_ecksum(nvlist_t *ereport, zio_bad_cksum_t *info,
void
zfs_ereport_post(const char *subclass, spa_t *spa, vdev_t *vd,
zbookmark_phys_t *zb, zio_t *zio, uint64_t stateoroffset, uint64_t size)
const zbookmark_phys_t *zb, zio_t *zio, uint64_t stateoroffset,
uint64_t size)
{
#ifdef _KERNEL
nvlist_t *ereport = NULL;
@@ -788,7 +789,7 @@ zfs_ereport_post(const char *subclass, spa_t *spa, vdev_t *vd,
}
void
zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, zbookmark_phys_t *zb,
zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, const zbookmark_phys_t *zb,
struct zio *zio, uint64_t offset, uint64_t length, void *arg,
zio_bad_cksum_t *info)
{
@@ -874,7 +875,7 @@ zfs_ereport_free_checksum(zio_cksum_report_t *rpt)
void
zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, zbookmark_phys_t *zb,
zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, const zbookmark_phys_t *zb,
struct zio *zio, uint64_t offset, uint64_t length,
const abd_t *good_data, const abd_t *bad_data, zio_bad_cksum_t *zbc)
{
module/zfs/zio.c
+1 -1
View File
@@ -506,7 +506,7 @@ error:
* the io_error. If this was not a speculative zio, create an ereport.
*/
if (ret == ECKSUM) {
ret = SET_ERROR(EIO);
zio->io_error = SET_ERROR(EIO);
if ((zio->io_flags & ZIO_FLAG_SPECULATIVE) == 0) {
zfs_ereport_post(FM_EREPORT_ZFS_AUTHENTICATION,
spa, NULL, &zio->io_bookmark, zio, 0, 0);