tty: Avoid a kernel memory discloure via kern.ttys

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

									
										sys/kern/tty.c
									
		+1
		
												View File
												
				@@ -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);