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Disallow non page-aligned file offsets in vm_mmap(). We don't support this

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in either the high or low level parts of the VM system. Just return EINVAL
in this case, just like SunOS does.
This commit is contained in:
David Greenman 1995-03-21 10:15:52 +00:00
parent f550a707bd
commit bc9ad24756
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=7215
1 changed files with 12 additions and 1 deletions
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13
sys/vm/vm_mmap.c
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@ -38,7 +38,7 @@
* from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
*
* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
* $Id: vm_mmap.c,v 1.15 1995/03/19 14:29:25 davidg Exp $
* $Id: vm_mmap.c,v 1.16 1995/03/21 02:54:04 davidg Exp $
*/
/*
@ -625,6 +625,17 @@ vm_mmap(map, addr, size, prot, maxprot, flags, handle, foff)
(void) vm_map_remove(map, *addr, *addr + size);
}
/*
* We currently can only deal with page aligned file offsets.
* The check is here rather than in the syscall because the
* kernel calls this function internally for other mmaping
* operations (such as in exec) and non-aligned offsets will
* cause pmap inconsistencies...so we want to be sure to
* disallow this in all cases.
*/
if (foff & PAGE_MASK)
return (EINVAL);
/*
* Lookup/allocate pager. All except an unnamed anonymous lookup gain
* a reference to ensure continued existance of the object. (XXX the