linux-kernel - [PATCH] i386 CPA fix - do not free reserved pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Fri, 13 Jul 2007 21:18:13 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>
Subject: [PATCH] i386 CPA fix - do not free reserved pages

i386 CPA fix - do not free reserved pages

We have to use the same conditions found in change_page_attr in
global_tlb_flush regarding the conditions that leads to free the page.

It applies to 2.6.22-rc6-mm1 (as it been applied for the next one ?)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: Andi Kleen <andi@...stfloor.org>
---
 arch/i386/mm/pageattr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6-lttng/arch/i386/mm/pageattr.c
===================================================================
--- linux-2.6-lttng.orig/arch/i386/mm/pageattr.c	2007-07-03 13:25:48.000000000 -0400
+++ linux-2.6-lttng/arch/i386/mm/pageattr.c	2007-07-03 13:28:34.000000000 -0400
@@ -247,7 +247,7 @@
 	list_for_each_entry_safe(pg, next, &l, lru) {
 		clear_bit(PG_arch_1, &pg->flags);
 		list_del(&pg->lru);
-		if (page_private(pg) != 0)
+		if (PageReserved(pg) || !cpu_has_pse || page_private(pg) != 0)
 			continue;
 		ClearPagePrivate(pg);
 		__free_page(pg);

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/