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Fix possible integer overflow when allocating PT map.

This commit is contained in:
leo 1995-12-25 14:13:53 +00:00
parent 7682dd538b
commit 608b4cc605
1 changed files with 13 additions and 3 deletions
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16
sys/arch/atari/atari/pmap.c
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@ -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)