646cd8897b
Updated block-dmmd script - fate#310510 - fix xenpaging restore changes to integrate paging into xm/xend xenpaging.autostart.patch xenpaging.doc.patch - bnc#787163 - VUL-0: CVE-2012-4544: xen: Domain builder Out-of- memory due to malicious kernel/ramdisk (XSA 25) CVE-2012-4544-xsa25.patch - bnc#779212 - VUL-0: CVE-2012-4411: XEN / qemu: guest administrator can access qemu monitor console (XSA-19) CVE-2012-4411-xsa19.patch - bnc#786516 - VUL-0: CVE-2012-4535: xen: Timer overflow DoS vulnerability CVE-2012-4535-xsa20.patch - bnc#786518 - VUL-0: CVE-2012-4536: xen: pirq range check DoS vulnerability CVE-2012-4536-xsa21.patch - bnc#786517 - VUL-0: CVE-2012-4537: xen: Memory mapping failure DoS vulnerability CVE-2012-4537-xsa22.patch - bnc#786519 - VUL-0: CVE-2012-4538: xen: Unhooking empty PAE entries DoS vulnerability CVE-2012-4538-xsa23.patch - bnc#786520 - VUL-0: CVE-2012-4539: xen: Grant table hypercall infinite loop DoS vulnerability CVE-2012-4539-xsa24.patch OBS-URL: https://build.opensuse.org/package/show/Virtualization/xen?expand=0&rev=212
36 lines
1.3 KiB
Diff
36 lines
1.3 KiB
Diff
References: CVE-2012-4538 XSA-23 bnc#786519
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xen/mm/shadow: check toplevel pagetables are present before unhooking them.
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If the guest has not fully populated its top-level PAE entries when it calls
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HVMOP_pagetable_dying, the shadow code could try to unhook entries from
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MFN 0. Add a check to avoid that case.
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This issue was introduced by c/s 21239:b9d2db109cf5.
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This is a security problem, XSA-23 / CVE-2012-4538.
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Signed-off-by: Tim Deegan <tim@xen.org>
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Tested-by: Andrew Cooper <andrew.cooper3@citrix.com>
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Acked-by: Ian Campbell <ian.campbell@citrix.com>
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Index: xen-4.2.0-testing/xen/arch/x86/mm/shadow/multi.c
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===================================================================
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--- xen-4.2.0-testing.orig/xen/arch/x86/mm/shadow/multi.c
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+++ xen-4.2.0-testing/xen/arch/x86/mm/shadow/multi.c
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@@ -4734,8 +4734,12 @@ static void sh_pagetable_dying(struct vc
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unsigned long gfn;
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mfn_t smfn, gmfn;
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- if ( fast_path )
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- smfn = _mfn(pagetable_get_pfn(v->arch.shadow_table[i]));
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+ if ( fast_path ) {
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+ if ( pagetable_is_null(v->arch.shadow_table[i]) )
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+ smfn = _mfn(INVALID_MFN);
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+ else
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+ smfn = _mfn(pagetable_get_pfn(v->arch.shadow_table[i]));
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+ }
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else
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{
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/* retrieving the l2s */
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