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Operation pmap_pp_clear_attrs() may remove the "used" attribute from a page 

that is still cached in the TLB of other CPUs.

Call pmap_tlb_shootnow() here before enabling preemption to clear the
TLB entries on other CPUs.

Should prevent tmpfs data corruption under load.

Ok: Chuck Silvers
This commit is contained in:
hannken 2016-01-26 14:34:50 +00:00
parent 1ef77d7e7c
commit 3d8ae9d74d
1 changed files with 3 additions and 2 deletions
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5
sys/arch/x86/x86/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.189 2015/11/11 08:20:22 skrll Exp $ */
/* $NetBSD: pmap.c,v 1.190 2016/01/26 14:34:50 hannken Exp $ */
/*-
* Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
@ -171,7 +171,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.189 2015/11/11 08:20:22 skrll Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.190 2016/01/26 14:34:50 hannken Exp $");
#include "opt_user_ldt.h"
#include "opt_lockdebug.h"
@ -3746,6 +3746,7 @@ startover:
}
result = pp->pp_attrs & clearbits;
pp->pp_attrs &= ~clearbits;
pmap_tlb_shootnow();
kpreempt_enable();
return result != 0;