xen-changelog

[Top] [All Lists]

[Xen-changelog] [xen-unstable] [Mini-OS] Catch NULL dereferences

from [Xen patchbot-unstable]

[Permanent Link][Original]

To:	xen-changelog@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-changelog] [xen-unstable] [Mini-OS] Catch NULL dereferences
From:	Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date:	Wed, 28 Nov 2007 09:40:14 -0800
Delivery-date:	Wed, 28 Nov 2007 09:41:31 -0800
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
List-help:	<mailto:xen-changelog-request@lists.xensource.com?subject=help>
List-id:	BK change log <xen-changelog.lists.xensource.com>
List-post:	<mailto:xen-changelog@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-changelog>, <mailto:xen-changelog-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-changelog>, <mailto:xen-changelog-request@lists.xensource.com?subject=unsubscribe>
Reply-to:	xen-devel@xxxxxxxxxxxxxxxxxxx
Sender:	xen-changelog-bounces@xxxxxxxxxxxxxxxxxxx

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1196253737 0
# Node ID 3fdbdd131fc7c64cacf99e2dd9eda40ca3ed40bb
# Parent  74bd94747ca31fae0616f8ecc36b389867fb13ed
[Mini-OS] Catch NULL dereferences

Unmap page 0 (only used early at boot) so as to catch NULL dereferences.

Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxx>
---
 extras/mini-os/arch/x86/mm.c |    3 +++
 1 files changed, 3 insertions(+)

diff -r 74bd94747ca3 -r 3fdbdd131fc7 extras/mini-os/arch/x86/mm.c
--- a/extras/mini-os/arch/x86/mm.c      Wed Nov 28 12:41:41 2007 +0000
+++ b/extras/mini-os/arch/x86/mm.c      Wed Nov 28 12:42:17 2007 +0000
@@ -270,6 +270,9 @@ void build_pagetable(unsigned long *star
         start_address += PAGE_SIZE;
     }
 
+    if (HYPERVISOR_update_va_mapping(0, (pte_t) {}, UVMF_INVLPG))
+        printk("Unable to unmap page 0\n");
+
     *start_pfn = pt_pfn;
 }
 

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog

[More with this subject...]

<Prev in Thread]	Current Thread	[Next in Thread>
[Xen-changelog] [xen-unstable] [Mini-OS] Catch NULL dereferences, Xen patchbot-unstable <=

Previous by Date:	[Xen-changelog] [xen-unstable] [Mini-OS] Fix strrchr() when string doesn't contain the character., Xen patchbot-unstable
Next by Date:	[Xen-changelog] [xen-unstable] x86_emulate: Emulate ENTER and LEAVE instructions., Xen patchbot-unstable
Previous by Thread:	[Xen-changelog] [xen-unstable] [Mini-OS] Fix strrchr() when string doesn't contain the character., Xen patchbot-unstable
Next by Thread:	[Xen-changelog] [xen-unstable] x86_emulate: Emulate ENTER and LEAVE instructions., Xen patchbot-unstable
Indexes:	[Date] [Thread] [Top] [All Lists]