Date: Tue, 09 Jun 2026 19:20:14 +0000 From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Cc: Ed Maste <emaste@FreeBSD.org> Subject: git: 8ed11b21e544 - releng/15.1 - vt: Avoid integer overflow in CONS_HISTORY ioctl Message-ID: <6a28676e.3d6e4.7ec97a90@gitrepo.freebsd.org>
index | next in thread | raw e-mail
The branch releng/15.1 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=8ed11b21e54417a450c64914a3898ce75c243c7f commit 8ed11b21e54417a450c64914a3898ce75c243c7f Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2026-05-26 16:19:47 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2026-06-09 03:00:15 +0000 vt: Avoid integer overflow in CONS_HISTORY ioctl Approved by: re (cperciva) Approved by: so Security: FreeBSD-SA-26:34.vt Security: CVE-2026-49416 Reviewed by: markj, vexeduxr Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D57250 (cherry picked from commit 0ae946e7223df5ef3f7980af1d774d7f593f6421) (cherry picked from commit deaaddf1d3c4283649945553ad7e3208c8424308) --- sys/dev/vt/vt_buf.c | 9 ++++----- sys/dev/vt/vt_core.c | 6 ++++-- 2 files changed, 8 insertions(+), 7 deletions(-) diff --git a/sys/dev/vt/vt_buf.c b/sys/dev/vt/vt_buf.c index e1e4ebc23491..43657fcecbdc 100644 --- a/sys/dev/vt/vt_buf.c +++ b/sys/dev/vt/vt_buf.c @@ -499,7 +499,6 @@ vtbuf_grow(struct vt_buf *vb, const term_pos_t *p, unsigned int history_size) { term_char_t *old, *new, **rows, **oldrows, **copyrows, *row, *oldrow; unsigned int w, h, c, r, old_history_size; - size_t bufsize, rowssize; int history_full; const teken_attr_t *a; term_char_t ch; @@ -510,10 +509,10 @@ vtbuf_grow(struct vt_buf *vb, const term_pos_t *p, unsigned int history_size) history_size = MAX(history_size, p->tp_row); /* Allocate new buffer. */ - bufsize = history_size * p->tp_col * sizeof(term_char_t); - new = malloc(bufsize, M_VTBUF, M_WAITOK | M_ZERO); - rowssize = history_size * sizeof(term_pos_t *); - rows = malloc(rowssize, M_VTBUF, M_WAITOK | M_ZERO); + new = mallocarray(history_size, p->tp_col * sizeof(term_char_t), + M_VTBUF, M_WAITOK | M_ZERO); + rows = mallocarray(history_size, sizeof(term_pos_t *), M_VTBUF, + M_WAITOK | M_ZERO); /* Toggle it. */ VTBUF_LOCK(vb); diff --git a/sys/dev/vt/vt_core.c b/sys/dev/vt/vt_core.c index 8360f0b80fb5..922b44028a23 100644 --- a/sys/dev/vt/vt_core.c +++ b/sys/dev/vt/vt_core.c @@ -40,6 +40,7 @@ #include <sys/kbio.h> #include <sys/kdb.h> #include <sys/kernel.h> +#include <sys/limits.h> #include <sys/linker.h> #include <sys/lock.h> #include <sys/malloc.h> @@ -2798,8 +2799,9 @@ skip_thunk: /* XXX */ return (0); case CONS_HISTORY: - if (*(int *)data < 0) - return EINVAL; + if (*(int *)data < 0 || + *(int *)data > UINT_MAX / USHRT_MAX / sizeof(term_char_t)) + return (EINVAL); if (*(int *)data != vw->vw_buf.vb_history_size) vtbuf_sethistory_size(&vw->vw_buf, *(int *)data); return (0);home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?6a28676e.3d6e4.7ec97a90>