Information

Advisory

XSA-299

Public release

2019-10-31 12:00

Updated

2019-10-31 12:28

Version

4

CVE(s)

CVE-2019-18421

Title

Issues with restartable PV type change operations

Filesadvisory-299.txt (signed advisory file)
xsa299.meta
xsa299-4.8/0001-x86-mm-Clean-up-trailing-whitespace.patch
xsa299-4.8/0002-x86-mm-L1TF-checks-don-t-leave-a-partial-entry.patch
xsa299-4.8/0003-x86-mm-Don-t-re-set-PGT_pinned-on-a-partially-de-val.patch
xsa299-4.8/0004-x86-mm-Separate-out-partial_pte-tristate-into-indivi.patch
xsa299-4.8/0005-x86-mm-Use-flags-for-_put_page_type-rather-than-a-bo.patch
xsa299-4.8/0006-x86-mm-Rework-get_page_and_type_from_mfn-conditional.patch
xsa299-4.8/0007-x86-mm-Have-alloc_l-23-_table-clear-partial_flags-wh.patch
xsa299-4.8/0008-x86-mm-Always-retain-a-general-ref-on-partial.patch
xsa299-4.8/0009-x86-mm-Collapse-PTF_partial_set-and-PTF_partial_gene.patch
xsa299-4.8/0010-x86-mm-Properly-handle-linear-pagetable-promotion-fa.patch
xsa299-4.8/0011-x86-mm-Fix-nested-de-validation-on-error.patch
xsa299-4.8/0012-x86-mm-Don-t-drop-a-type-ref-unless-you-held-a-ref-t.patch
xsa299-4.9/0001-x86-mm-Clean-up-trailing-whitespace.patch
xsa299-4.9/0002-x86-mm-L1TF-checks-don-t-leave-a-partial-entry.patch
xsa299-4.9/0003-x86-mm-Don-t-re-set-PGT_pinned-on-a-partially-de-val.patch
xsa299-4.9/0004-x86-mm-Separate-out-partial_pte-tristate-into-indivi.patch
xsa299-4.9/0005-x86-mm-Use-flags-for-_put_page_type-rather-than-a-bo.patch
xsa299-4.9/0006-x86-mm-Rework-get_page_and_type_from_mfn-conditional.patch
xsa299-4.9/0007-x86-mm-Have-alloc_l-23-_table-clear-partial_flags-wh.patch
xsa299-4.9/0008-x86-mm-Always-retain-a-general-ref-on-partial.patch
xsa299-4.9/0009-x86-mm-Collapse-PTF_partial_set-and-PTF_partial_gene.patch
xsa299-4.9/0010-x86-mm-Properly-handle-linear-pagetable-promotion-fa.patch
xsa299-4.9/0011-x86-mm-Fix-nested-de-validation-on-error.patch
xsa299-4.9/0012-x86-mm-Don-t-drop-a-type-ref-unless-you-held-a-ref-t.patch
xsa299-4.10/0001-x86-mm-L1TF-checks-don-t-leave-a-partial-entry.patch
xsa299-4.10/0002-x86-mm-Don-t-re-set-PGT_pinned-on-a-partially-de-val.patch
xsa299-4.10/0003-x86-mm-Separate-out-partial_pte-tristate-into-indivi.patch
xsa299-4.10/0004-x86-mm-Use-flags-for-_put_page_type-rather-than-a-bo.patch
xsa299-4.10/0005-x86-mm-Rework-get_page_and_type_from_mfn-conditional.patch
xsa299-4.10/0006-x86-mm-Have-alloc_l-23-_table-clear-partial_flags-wh.patch
xsa299-4.10/0007-x86-mm-Always-retain-a-general-ref-on-partial.patch
xsa299-4.10/0008-x86-mm-Collapse-PTF_partial_set-and-PTF_partial_gene.patch
xsa299-4.10/0009-x86-mm-Properly-handle-linear-pagetable-promotion-fa.patch
xsa299-4.10/0010-x86-mm-Fix-nested-de-validation-on-error.patch
xsa299-4.10/0011-x86-mm-Don-t-drop-a-type-ref-unless-you-held-a-ref-t.patch
xsa299-4.11/0001-x86-mm-L1TF-checks-don-t-leave-a-partial-entry.patch
xsa299-4.11/0002-x86-mm-Don-t-re-set-PGT_pinned-on-a-partially-de-val.patch
xsa299-4.11/0003-x86-mm-Separate-out-partial_pte-tristate-into-indivi.patch
xsa299-4.11/0004-x86-mm-Use-flags-for-_put_page_type-rather-than-a-bo.patch
xsa299-4.11/0005-x86-mm-Rework-get_page_and_type_from_mfn-conditional.patch
xsa299-4.11/0006-x86-mm-Have-alloc_l-23-_table-clear-partial_flags-wh.patch
xsa299-4.11/0007-x86-mm-Always-retain-a-general-ref-on-partial.patch
xsa299-4.11/0008-x86-mm-Collapse-PTF_partial_set-and-PTF_partial_gene.patch
xsa299-4.11/0009-x86-mm-Properly-handle-linear-pagetable-promotion-fa.patch
xsa299-4.11/0010-x86-mm-Fix-nested-de-validation-on-error.patch
xsa299-4.11/0011-x86-mm-Don-t-drop-a-type-ref-unless-you-held-a-ref-t.patch
xsa299-4.12/0001-x86-mm-L1TF-checks-don-t-leave-a-partial-entry.patch
xsa299-4.12/0002-x86-mm-Don-t-re-set-PGT_pinned-on-a-partially-de-val.patch
xsa299-4.12/0003-x86-mm-Separate-out-partial_pte-tristate-into-indivi.patch
xsa299-4.12/0004-x86-mm-Use-flags-for-_put_page_type-rather-than-a-bo.patch
xsa299-4.12/0005-x86-mm-Rework-get_page_and_type_from_mfn-conditional.patch
xsa299-4.12/0006-x86-mm-Have-alloc_l-23-_table-clear-partial_flags-wh.patch
xsa299-4.12/0007-x86-mm-Always-retain-a-general-ref-on-partial.patch
xsa299-4.12/0008-x86-mm-Collapse-PTF_partial_set-and-PTF_partial_gene.patch
xsa299-4.12/0009-x86-mm-Properly-handle-linear-pagetable-promotion-fa.patch
xsa299-4.12/0010-x86-mm-Fix-nested-de-validation-on-error.patch
xsa299-4.12/0011-x86-mm-Don-t-drop-a-type-ref-unless-you-held-a-ref-t.patch
xsa299/0001-x86-mm-L1TF-checks-don-t-leave-a-partial-entry.patch
xsa299/0002-x86-mm-Don-t-re-set-PGT_pinned-on-a-partially-de-val.patch
xsa299/0003-x86-mm-Separate-out-partial_pte-tristate-into-indivi.patch
xsa299/0004-x86-mm-Use-flags-for-_put_page_type-rather-than-a-bo.patch
xsa299/0005-x86-mm-Rework-get_page_and_type_from_mfn-conditional.patch
xsa299/0006-x86-mm-Have-alloc_l-23-_table-clear-partial_flags-wh.patch
xsa299/0007-x86-mm-Always-retain-a-general-ref-on-partial.patch
xsa299/0008-x86-mm-Collapse-PTF_partial_set-and-PTF_partial_gene.patch
xsa299/0009-x86-mm-Properly-handle-linear-pagetable-promotion-fa.patch
xsa299/0010-x86-mm-Fix-nested-de-validation-on-error.patch
xsa299/0011-x86-mm-Don-t-drop-a-type-ref-unless-you-held-a-ref-t.patchAdvisory

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

        Xen Security Advisory CVE-2019-18421 / XSA-299
                           version 4

       Issues with restartable PV type change operations

UPDATES IN VERSION 4

Public release.

ISSUE DESCRIPTION

To avoid using shadow pagetables for PV guests, Xen exposes the actual hardware pagetables to the guest. In order to prevent the guest from modifying these page tables directly, Xen keeps track of how pages are used using a type system; pages must be “promoted” before being used as a pagetable, and “demoted” before being used for any other type. Xen also allows for “recursive” promotions: i.e., an operating system promoting a page to an L4 pagetable may end up causing pages to be promoted to L3s, which may in turn cause pages to be promoted to L2s, and so on. These operations may take an arbitrarily large amount of time, and so must be re-startable.

Unfortunately, making recursive pagetable promotion and demotion operations restartable is incredibly complicated, and the code contains several races which, if triggered, can cause Xen to drop or retain extra type counts, potentially allowing guests to get write access to in-use pagetables.

IMPACT

A malicious PV guest administrator may be able to escalate their privilege to that of the host.

VULNERABLE SYSTEMS

All x86 systems with untrusted PV guests are vulnerable.

HVM and PVH guests cannot exercise this vulnerability. ARM systems are not vulnerable because ARM guests are all PVH.

All security-supported Xen versions are vulnerable.

Note that these attacks require very precise timing, which may be difficult to exploit in practice.

MITIGATION

Running only HVM or PVH guests will avoid this vulnerability.

Running PV guests in “shim” mode will also avoid this vulnerability.

CREDITS

This issue was discovered by George Dunlap of Citrix.

RESOLUTION

Applying the appropriate attached patch resolves this issue.

xsa299/*.patch xen-unstable xsa299-4.12/*.patch Xen 4.12.x xsa299-4.11/*.patch Xen 4.11.x xsa299-4.10/*.patch Xen 4.10.x xsa299-4.9/*.patch Xen 4.9.x xsa299-4.8/*.patch Xen 4.8.x

$ sha256sum xsa299* xsa299*/* 687fb0f3273a424726edb4d249b79cfc45d1ef7000610405b11eaac49baecaa8 xsa299.meta 6c8f46e57f61a5e1e2e5e628a32e4c9ae144218ce475309811bb9900d3fdda48 xsa299-4.8/0001-x86-mm-Clean-up-trailing-whitespace.patch 3409e71ed7bc199bcda33892ea6f70fe257c4f3906d74b4a6f4352415daeedb0 xsa299-4.8/0002-x86-mm-L1TF-checks-don-t-leave-a-partial-entry.patch 1179fe0f1a591c542478bf8614501f8ddb67e342d7d452f6bff3b6a999f2b20f xsa299-4.8/0003-x86-mm-Don-t-re-set-PGT_pinned-on-a-partially-de-val.patch bc0352a1d82079c4072cc3871d0d397f7abb3c0480dfc3c5c542091d2ec7d7b0 xsa299-4.8/0004-x86-mm-Separate-out-partial_pte-tristate-into-indivi.patch 2b96857ef3e0f8259df7ad01600f1c30ca234668d6f26744c2ae0d3d7dded090 xsa299-4.8/0005-x86-mm-Use-flags-for-_put_page_type-rather-than-a-bo.patch fe119a8255e23a86845fa1ac5f93afa25acdaff705061c172ea9e0589b0bc1a4 xsa299-4.8/0006-x86-mm-Rework-get_page_and_type_from_mfn-conditional.patch 562415d5fdb4e173443a2aa211094743a722ef1fe5a2d19c59cb3d329e101984 xsa299-4.8/0007-x86-mm-Have-alloc_l-23-_table-clear-partial_flags-wh.patch 454296ac46ea5feea8866101e7c953bf6dbd37a5275f7b006eeb6d22cbae387d xsa299-4.8/0008-x86-mm-Always-retain-a-general-ref-on-partial.patch f203a70da67f304c2ede516ef989b58ace6774eeee4eca919631c75f09860ba3 xsa299-4.8/0009-x86-mm-Collapse-PTF_partial_set-and-PTF_partial_gene.patch 1f4877c10ead99c51d822d29ebaed9774cdb97cca869fe1a1ccf905540e291c7 xsa299-4.8/0010-x86-mm-Properly-handle-linear-pagetable-promotion-fa.patch 733d260d731cce9902d66dc5b42ae9d10a319acda6dadcc426b6dfeba6e917da xsa299-4.8/0011-x86-mm-Fix-nested-de-validation-on-error.patch cd105c15e2fd915644cb7d31000df60e51d1054a807b575d5436ccb87c1e9a18 xsa299-4.8/0012-x86-mm-Don-t-drop-a-type-ref-unless-you-held-a-ref-t.patch d8db456679e652f5a33a0a448d379e3a88b0cf7ce1415ee46007873cfb6f49b7 xsa299-4.9/0001-x86-mm-Clean-up-trailing-whitespace.patch e54df901b5f13d70643938ff365a09a43725637511251efc3ac55c45b80016f5 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xsa299/0006-x86-mm-Have-alloc_l-23-_table-clear-partial_flags-wh.patch 6f0502b2377db2115faf9c7bcbf35898013dcec74170950c3aa7a0586ff1e174 xsa299/0007-x86-mm-Always-retain-a-general-ref-on-partial.patch 787c3eeaadfed46947fb17773fa8f9e9efe891658d7460eaf5291a4ca6155123 xsa299/0008-x86-mm-Collapse-PTF_partial_set-and-PTF_partial_gene.patch 77341c4d0ab62fbb7090d2a6b60902467563ae470ac0807ef40a3ac791d2933a xsa299/0009-x86-mm-Properly-handle-linear-pagetable-promotion-fa.patch e489f49f8783fb388161365072da585c049e05d80306cf963cec5ecbb3bc67c7 xsa299/0010-x86-mm-Fix-nested-de-validation-on-error.patch 17b9ae71c150747bff4d57eee8a918b1961e880e25ae2b9c0dbe933e005cb1a0 xsa299/0011-x86-mm-Don-t-drop-a-type-ref-unless-you-held-a-ref-t.patch $

NOTE ON RESOLUTION

Even with these fixes, the code is still very complicated. After the embargo is up, we plan to try getting rid of automatic recursive pagetable promotion entirely, instead requiring guest operating systems to promote pages one-by-one themselves. This would obviate the need to have restartable operations, greatly simplifying the reference counting code.

DEPLOYMENT DURING EMBARGO

Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators.

But: Distribution of updated software is prohibited (except to other members of the predisclosure list).

Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team.

(Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team’s decisionmaking.)

For more information about permissible uses of embargoed information, consult the Xen Project community’s agreed Security Policy: http://www.xenproject.org/security-policy.html -----BEGIN PGP SIGNATURE-----

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Xenproject.org Security Team