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Fix 2 bugs in non-raw send with encryption

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Bisecting identified the redacted send/receive as the source of the bug
for issue #12014. Specifically the call to
dsl_dataset_hold_obj(&fromds) has been replaced by
dsl_dataset_hold_obj_flags() which passes a DECRYPT flag and creates
a key mapping. A subsequent dsl_dataset_rele_flag(&fromds) is missing
and the key mapping is not cleared. This may be inadvertedly used, which
results in arc_untransform failing with ECKSUM in:
 arc_untransform+0x96/0xb0 [zfs]
 dbuf_read_verify_dnode_crypt+0x196/0x350 [zfs]
 dbuf_read+0x56/0x770 [zfs]
 dmu_buf_hold_by_dnode+0x4a/0x80 [zfs]
 zap_lockdir+0x87/0xf0 [zfs]
 zap_lookup_norm+0x5c/0xd0 [zfs]
 zap_lookup+0x16/0x20 [zfs]
 zfs_get_zplprop+0x8d/0x1d0 [zfs]
 setup_featureflags+0x267/0x2e0 [zfs]
 dmu_send_impl+0xe7/0xcb0 [zfs]
 dmu_send_obj+0x265/0x360 [zfs]
 zfs_ioc_send+0x10c/0x280 [zfs]

Fix this by restoring the call to dsl_dataset_hold_obj().

The same applies for to_ds: here replace dsl_dataset_rele(&to_ds) with
dsl_dataset_rele_flags().

Both leaked key mappings will cause a panic when exporting the
sending pool or unloading the zfs module after a non-raw send from
an encrypted filesystem.

Contributions-by: Hank Barta <hbarta@gmail.com>
Contributions-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #12014
Closes #17340
(cherry picked from commit ea74cdedda)
This commit is contained in:
George Amanakis 2025-05-19 18:55:00 +02:00 committed by Tony Hutter
parent 6517ebf4da
commit f28c685a84
1 changed files with 3 additions and 3 deletions
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6
module/zfs/dmu_send.c
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@ -2687,8 +2687,8 @@ dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
}
if (fromsnap != 0) {
err = dsl_dataset_hold_obj_flags(dspp.dp, fromsnap, dsflags,
FTAG, &fromds);
err = dsl_dataset_hold_obj(dspp.dp, fromsnap, FTAG, &fromds);
if (err != 0) {
dsl_dataset_rele_flags(dspp.to_ds, dsflags, FTAG);
dsl_pool_rele(dspp.dp, FTAG);
@ -2740,7 +2740,7 @@ dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
kmem_free(dspp.fromredactsnaps,
dspp.numfromredactsnaps * sizeof (uint64_t));
dsl_dataset_rele(dspp.to_ds, FTAG);
dsl_dataset_rele_flags(dspp.to_ds, dsflags, FTAG);
return (err);
}