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Fixes for KMSAN reports #12383

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Fixes for KMSAN reports #12383

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b5a60f7
Initialize "autoreplace" in spa_ld_get_props()
markjdb Jul 16, 2021
faf7590
Initialize all fields in zfs_log_xvattr()
markjdb Jul 16, 2021
bdb7b08
Zero pad bytes when allocating a ZIL record
markjdb Jul 16, 2021
e423793
Zero pad bytes following TX_WRITE log data
markjdb Jul 16, 2021
f75b909
Initialize dn_next_type[] in the dnode constructor
markjdb Jul 16, 2021
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1 change: 1 addition & 0 deletions module/zfs/dnode.c
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Original file line number Diff line number Diff line change
Expand Up @@ -129,6 +129,7 @@ dnode_cons(void *arg, void *unused, int kmflag)
zfs_refcount_create(&dn->dn_tx_holds);
list_link_init(&dn->dn_link);

bzero(&dn->dn_next_type[0], sizeof (dn->dn_next_type));
bzero(&dn->dn_next_nblkptr[0], sizeof (dn->dn_next_nblkptr));
bzero(&dn->dn_next_nlevels[0], sizeof (dn->dn_next_nlevels));
bzero(&dn->dn_next_indblkshift[0], sizeof (dn->dn_next_indblkshift));
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2 changes: 1 addition & 1 deletion module/zfs/spa.c
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Expand Up @@ -4183,7 +4183,7 @@ spa_ld_get_props(spa_t *spa)
return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO));

if (error == 0) {
uint64_t autoreplace;
uint64_t autoreplace = 0;

spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs);
spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace);
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4 changes: 3 additions & 1 deletion module/zfs/zfs_log.c
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Expand Up @@ -126,9 +126,11 @@ zfs_log_xvattr(lr_attr_t *lrattr, xvattr_t *xvap)

/* Now pack the attributes up in a single uint64_t */
attrs = (uint64_t *)bitmap;
*attrs = 0;
crtime = attrs + 1;
bzero(crtime, 2 * sizeof (uint64_t));
scanstamp = (caddr_t)(crtime + 2);
*attrs = 0;
bzero(scanstamp, AV_SCANSTAMP_SZ);
if (XVA_ISSET_REQ(xvap, XAT_READONLY))
*attrs |= (xoap->xoa_readonly == 0) ? 0 :
XAT0_READONLY;
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15 changes: 10 additions & 5 deletions module/zfs/zil.c
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Expand Up @@ -1619,7 +1619,7 @@ zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb)
lr_t *lrcb, *lrc;
lr_write_t *lrwb, *lrw;
char *lr_buf;
uint64_t dlen, dnow, lwb_sp, reclen, txg, max_log_data;
uint64_t dlen, dnow, dpad, lwb_sp, reclen, txg, max_log_data;

ASSERT(MUTEX_HELD(&zilog->zl_issuer_lock));
ASSERT3P(lwb, !=, NULL);
Expand Down Expand Up @@ -1653,8 +1653,9 @@ zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb)
if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY) {
dlen = P2ROUNDUP_TYPED(
lrw->lr_length, sizeof (uint64_t), uint64_t);
dpad = dlen - lrw->lr_length;
} else {
dlen = 0;
dlen = dpad = 0;
}
reclen = lrc->lrc_reclen;
zilog->zl_cur_used += (reclen + dlen);
Expand Down Expand Up @@ -1748,6 +1749,9 @@ zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb)
error = zilog->zl_get_data(itx->itx_private,
itx->itx_gen, lrwb, dbuf, lwb,
lwb->lwb_write_zio);
if (dbuf != NULL && error == 0 && dnow == dlen)
/* Zero any padding bytes in the last block. */
bzero((char *)dbuf + lrwb->lr_length, dpad);

if (error == EIO) {
txg_wait_synced(zilog->zl_dmu_pool, txg);
Expand Down Expand Up @@ -1785,18 +1789,19 @@ zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb)
}

itx_t *
zil_itx_create(uint64_t txtype, size_t lrsize)
zil_itx_create(uint64_t txtype, size_t olrsize)
{
size_t itxsize;
size_t itxsize, lrsize;
itx_t *itx;

lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t);
lrsize = P2ROUNDUP_TYPED(olrsize, sizeof (uint64_t), size_t);
itxsize = offsetof(itx_t, itx_lr) + lrsize;

itx = zio_data_buf_alloc(itxsize);
itx->itx_lr.lrc_txtype = txtype;
itx->itx_lr.lrc_reclen = lrsize;
itx->itx_lr.lrc_seq = 0; /* defensive */
bzero((char *)&itx->itx_lr + olrsize, lrsize - olrsize);
itx->itx_sync = B_TRUE; /* default is synchronous */
itx->itx_callback = NULL;
itx->itx_callback_data = NULL;
Expand Down