git: 9fbdf07d9ef2 - stable/15 - kqueue: fix the always-empty NT_PROCSTAT_KQUEUES core note

The branch stable/15 has been updated by adrian:

URL: https://cgit.FreeBSD.org/src/commit/?id=9fbdf07d9ef27773aae245505ba47d0c2f83e901

commit 9fbdf07d9ef27773aae245505ba47d0c2f83e901
Author:     Abdelkader Boudih <freebsd@seuros.com>
AuthorDate: 2026-08-03 18:11:49 +0000
Commit:     Adrian Chadd <adrian@FreeBSD.org>
CommitDate: 2026-10-31 18:20:17 +0000

    kqueue: fix the always-empty NT_PROCSTAT_KQUEUES core note
    
    sbuf reserves a byte of its buffer for the terminator, so the sbuf
    created with maxlen held one byte less than the sizing pass had
    computed.  The last record overflowed it, sbuf_bcat() failed, and the
    error == 0 guard skipped the copy into the caller's sbuf, so the note
    has been emitted at full size but zero filled since 5e7c43ff02dc.
    
    Fixes: 5e7c43ff02dc
    
    Reviewed by:    adrian, markj
    Differential Revision:  https://reviews.freebsd.org/D58583
    MFC after: 1 week
    
    (cherry picked from commit 5078280bb42c00eecffeabf93706c145e87b4b2b)
---
 sys/kern/kern_event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/kern_event.c b/sys/kern/kern_event.c
index 058dbca25a72..6a256cdbf606 100644
--- a/sys/kern/kern_event.c
+++ b/sys/kern/kern_event.c
@@ -3375,7 +3375,7 @@ kern_proc_kqueues_out(struct proc *p, struct sbuf *sb, size_t maxlen,
 		sb_len = 128;
 	else
 		sb_len = maxlen;
-	s = sbuf_new(&sm, NULL, sb_len, SBUF_FIXEDLEN);
+	s = sbuf_new(&sm, NULL, sb_len + 1, SBUF_FIXEDLEN);
 	error = kern_proc_kqueues_out1(curthread, p, s, compat32);
 	sbuf_finish(s);
 	if (error == 0)