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Zero pad bytes when allocating a ZIL record

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When allocating a record, we round up the allocation size to a multiple
of 8.  In this case, any padding bytes should be zeroed, otherwise the
contents of uninitialized memory are written to the ZIL.

This was found using KMSAN.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Mark Johnston <markj@FreeBSD.org>
Closes #12383
This commit is contained in:
Mark Johnston 2021-07-16 09:34:54 -04:00 committed by Brian Behlendorf
parent 03363b2f86
commit 58714c2817
1 changed files with 4 additions and 3 deletions
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7
module/zfs/zil.c
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@ -1785,18 +1785,19 @@ cont:
}
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;