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tty: Avoid a kernel memory discloure via kern.ttys

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Four pad bytes at the end of each xtty structure were not being cleared
before being copied out.  Fix this by clearing the whole structure
before populating fields.

MFC after:	3 days
Reported by:	KMSAN
This commit is contained in:
Mark Johnston 2023-12-11 09:19:09 -05:00
parent ce2f34ade8
commit 3c0fb026b2
1 changed files with 1 additions and 0 deletions
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sys/kern/tty.c
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@ -1288,6 +1288,7 @@ tty_to_xtty(struct tty *tp, struct xtty *xt)
tty_assert_locked(tp);
memset(xt, 0, sizeof(*xt));
xt->xt_size = sizeof(struct xtty);
xt->xt_insize = ttyinq_getsize(&tp->t_inq);
xt->xt_incc = ttyinq_bytescanonicalized(&tp->t_inq);