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Code Issues Releases Activity

Disallow both MS_ASYNC and MS_INVALIDATE flags being set at the same time

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in msync().
This commit is contained in:
David Greenman 1995-03-25 17:36:00 +00:00
parent cdfc91f0da
commit 1e62bc6357
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=7364
1 changed files with 6 additions and 3 deletions
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9
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 1.18 1995/03/22 05:08:41 davidg Exp $
* $Id: vm_mmap.c,v 1.19 1995/03/25 16:55:46 davidg Exp $
*/
/*
@ -323,13 +323,16 @@ msync(p, uap, retval)
printf("msync(%d): addr %x len %x\n",
p->p_pid, uap->addr, uap->len);
#endif
if (((int) uap->addr & PAGE_MASK) || uap->addr + uap->len < uap->addr)
return (EINVAL);
map = &p->p_vmspace->vm_map;
addr = (vm_offset_t) uap->addr;
size = (vm_size_t) uap->len;
flags = uap->flags;
if (((int) addr & PAGE_MASK) || addr + size < addr ||
(flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
return (EINVAL);
/*
* XXX Gak! If size is zero we are supposed to sync "all modified
* pages with the region containing addr". Unfortunately, we don't