git: 5c8af592f69a - main - procctl(PROC_REAP_KILL): align error reporting with pgkill(2)

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=5c8af592f69a31da94c45722dcd74afcf0ab375e

commit 5c8af592f69a31da94c45722dcd74afcf0ab375e
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-02-18 08:22:51 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-02-21 09:45:47 +0000

    procctl(PROC_REAP_KILL): align error reporting with pgkill(2)
    
    ESRCH from cr_cansignal() means that the target process should be not
    visible to the initiator.  So do not report pids with ESRCH result.
    
    Noted by:       markj
    Reviewed by:    markj, olce
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D55341
---
 sys/kern/kern_procctl.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sys/kern/kern_procctl.c b/sys/kern/kern_procctl.c
index 30ab37d56877..b1539c5cec4f 100644
--- a/sys/kern/kern_procctl.c
+++ b/sys/kern/kern_procctl.c
@@ -267,7 +267,11 @@ reap_kill_proc_locked(struct reap_kill_proc_work *w)
 
 	error = cr_cansignal(w->cr, w->target, w->rk->rk_sig);
 	if (error != 0) {
-		if (*w->error == ESRCH) {
+		/*
+		 * Hide ESRCH errors to ensure that this function
+		 * cannot be used as an oracle for process visibility.
+		 */
+		if (error != ESRCH && *w->error == 0) {
 			w->rk->rk_fpid = w->target->p_pid;
 			*w->error = error;
 		}