diff options
| author | Ed Maste <emaste@FreeBSD.org> | 2026-05-26 16:19:47 +0000 |
|---|---|---|
| committer | Mark Johnston <markj@FreeBSD.org> | 2026-06-07 17:48:17 +0000 |
| commit | 9cba21c2de1668717a77833ad1533416babe131a (patch) | |
| tree | 872895539c93f6de47f9a6cca07cd9d3148d192b | |
| parent | a68c183e0ad2ceefa2a1ea8f8c8d1d1937c36c0d (diff) | |
vt: Avoid integer overflow in CONS_HISTORY ioctl
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)
(cherry picked from commit b5a4f4bfbc95d5d5361da708728f7f4a6db2ee60)
| -rw-r--r-- | sys/dev/vt/vt_buf.c | 9 | ||||
| -rw-r--r-- | 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 ea27ea8a5ebf..0fd301bb662a 100644 --- a/sys/dev/vt/vt_buf.c +++ b/sys/dev/vt/vt_buf.c @@ -500,7 +500,6 @@ 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; @@ -511,10 +510,10 @@ 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 50f12512a81c..547bee8be86a 100644 --- a/sys/dev/vt/vt_core.c +++ b/sys/dev/vt/vt_core.c @@ -41,6 +41,7 @@ #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> @@ -2771,8 +2772,9 @@ 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); |