git: 224d65015465 - stable/15 - vt: Allow VT_SETMODE with frsig=0

The branch stable/15 has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=224d65015465d085f2e07edccef1f23a8c217b88

commit 224d65015465d085f2e07edccef1f23a8c217b88
Author:     Ed Maste <emaste@FreeBSD.org>
AuthorDate: 2025-09-30 19:39:34 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2025-12-09 16:32:10 +0000

    vt: Allow VT_SETMODE with frsig=0
    
    Linux does not check that any of the signals in vt_mode VT_SETMODE ioctl
    (relsig, acqsig, frsig) are valid, but FreeBSD required that all three
    are valid.  frsig is unusued in both Linux and FreeBSD, and software
    typically leaves it unset.  To improve portability, allow frsig to be
    set to zero.
    
    PR:             289812
    Reported by:    Dušan Gvozdenović
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D52835
    
    (cherry picked from commit 5198c32210039d8dc92554647384eee75688848c)
---
 sys/dev/vt/vt_core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sys/dev/vt/vt_core.c b/sys/dev/vt/vt_core.c
index b51ef6766de4..6d1012110678 100644
--- a/sys/dev/vt/vt_core.c
+++ b/sys/dev/vt/vt_core.c
@@ -3044,9 +3044,9 @@ skip_thunk:
 				DPRINTF(5, "reset WAIT_ACQ, ");
 			return (0);
 		} else if (mode->mode == VT_PROCESS) {
-			if (!ISSIGVALID(mode->relsig) ||
-			    !ISSIGVALID(mode->acqsig) ||
-			    !ISSIGVALID(mode->frsig)) {
+			if (!(ISSIGVALID(mode->relsig) &&
+			    ISSIGVALID(mode->acqsig) &&
+			    (mode->frsig == 0 || ISSIGVALID(mode->frsig)))) {
 				DPRINTF(5, "error EINVAL\n");
 				return (EINVAL);
 			}