From owner-freebsd-bugs  Sun May 14 12: 0: 8 2000
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Date: Sun, 14 May 2000 12:00:01 -0700 (PDT)
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To: freebsd-bugs@FreeBSD.org
Cc: 
From: Matthew Dillon <dillon@apollo.backplane.com>
Subject: Re: i386/18095: critical VM mmap/madvise bug
Reply-To: Matthew Dillon <dillon@apollo.backplane.com>
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The following reply was made to PR i386/18095; it has been noted by GNATS.

From: Matthew Dillon <dillon@apollo.backplane.com>
To: pha@pdq.com
Cc: FreeBSD-gnats-submit@freebsd.org
Subject: Re: i386/18095: critical VM mmap/madvise bug
Date: Sun, 14 May 2000 11:41:34 -0700 (PDT)

     Paul, try this patch to /usr/src/sys/vm/vm_map.c and tell me if 
     it works.  It appears to work for me when I test using your 
     test program.
 
 					-Matt
 					Matthew Dillon 
 					<dillon@backplane.com>
 
 Index: vm_map.c
 ===================================================================
 RCS file: /home/ncvs/src/sys/vm/vm_map.c,v
 retrieving revision 1.187
 diff -u -r1.187 vm_map.c
 --- vm_map.c	2000/02/28 04:10:35	1.187
 +++ vm_map.c	2000/05/14 18:31:06
 @@ -1127,15 +1127,19 @@
  		     (current != &map->header) && (current->start < end);
  		     current = current->next
  		) {
 +			vm_offset_t useStart;
 +
  			if (current->eflags & MAP_ENTRY_IS_SUB_MAP)
  				continue;
  
  			pindex = OFF_TO_IDX(current->offset);
  			count = atop(current->end - current->start);
 +			useStart = current->start;
  
  			if (current->start < start) {
  				pindex += atop(start - current->start);
  				count -= atop(start - current->start);
 +				useStart = start;
  			}
  			if (current->end > end)
  				count -= atop(current->end - end);
 @@ -1148,7 +1152,7 @@
  			if (behav == MADV_WILLNEED) {
  				pmap_object_init_pt(
  				    map->pmap, 
 -				    current->start,
 +				    useStart,
  				    current->object.vm_object,
  				    pindex, 
  				    (count << PAGE_SHIFT),
 


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