diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 1995-12-27 22:27:00 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 1995-12-27 22:27:00 +0000 |
| commit | 8d488e2a77ae000baef9b8aa9f105c14ffea935a (patch) | |
| tree | 403034576f2af7c508a42c073eefab82f4373b9e /sys | |
| parent | 1b9fb5d1f367934db39e880ded794cc73ada09f0 (diff) | |
from netbsd; Fix possible integer overflow when allocating PT map
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/atari/atari/pmap.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/sys/arch/atari/atari/pmap.c b/sys/arch/atari/atari/pmap.c index ca2eb527895..9a1ff4963ad 100644 --- a/sys/arch/atari/atari/pmap.c +++ b/sys/arch/atari/atari/pmap.c @@ -1,4 +1,4 @@ -/* $NetBSD: pmap.c,v 1.7 1995/11/30 00:57:39 jtc Exp $ */ +/* $NetBSD: pmap.c,v 1.8 1995/12/25 14:13:53 leo Exp $ */ /* * Copyright (c) 1991 Regents of the University of California. @@ -356,7 +356,6 @@ pmap_bootstrap_alloc(size) return((void *) val); } - /* * Initialize the pmap module. * Called by vm_init, to initialize any structures that the pmap @@ -493,7 +492,18 @@ pmap_init(phys_start, phys_end) * map where we want it. */ addr = ATARI_UPTBASE; - s = min(ATARI_UPTMAXSIZE, maxproc * ATARI_UPTSIZE); + if (ATARI_UPTMAXSIZE / ATARI_UPTSIZE < maxproc) { + s = ATARI_UPTMAXSIZE; + + /* + * XXX We don't want to hang when we run out of page + * tables, so we lower maxproc so that fork will fail + * instead. Note that root could still raise this + * value through sysctl(2). + */ + maxproc = ATARI_UPTMAXSIZE / ATARI_UPTSIZE; + } + else s = maxproc * ATARI_UPTSIZE; addr2 = addr + s; rv = vm_map_find(kernel_map, NULL, 0, &addr, s, TRUE); if (rv != KERN_SUCCESS) |