From e71d5c7331700504e58cf1a35dca529381723e02 Mon Sep 17 00:00:00 2001
From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Sat, 22 May 2021 20:12:31 +0000
Subject: [PATCH] Fix limit testing after 1762f674ccb571e6 ktrace commit.

The previous:

if ((uoff_t)uio->uio_offset + uio->uio_resid > lim)
	signal(....);

was replaced with:

if ((uoff_t)uio->uio_offset + uio->uio_resid < lim)
	return;
signal(....);

Making (uoff_t)uio->uio_offset + uio->uio_resid == lim trip over the
limit, when it did not previously.

Unbreaks running 13.0 buildworld.
---
 sys/kern/vfs_vnops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index 9e45d1820eec..34fcef1b7e1f 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -2368,7 +2368,7 @@ vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio,
 		return (0);
 	ktr_write = (td->td_pflags & TDP_INKTRACE) != 0;
 	lim = ktr_write ? td->td_ktr_io_lim : lim_cur(td, RLIMIT_FSIZE);
-	if ((uoff_t)uio->uio_offset + uio->uio_resid < lim)
+	if ((uoff_t)uio->uio_offset + uio->uio_resid <= lim)
 		return (0);
 
 	if (!ktr_write || ktr_filesize_limit_signal) {