diff options
Diffstat (limited to 'system/xen/xsa/xsa388-4.15-2.patch')
| -rw-r--r-- | system/xen/xsa/xsa388-4.15-2.patch | 36 |
1 files changed, 0 insertions, 36 deletions
diff --git a/system/xen/xsa/xsa388-4.15-2.patch b/system/xen/xsa/xsa388-4.15-2.patch deleted file mode 100644 index ccccb20263b22..0000000000000 --- a/system/xen/xsa/xsa388-4.15-2.patch +++ /dev/null @@ -1,36 +0,0 @@ -From: Jan Beulich <jbeulich@suse.com> -Subject: x86/PoD: handle intermediate page orders in p2m_pod_cache_add() - -p2m_pod_decrease_reservation() may pass pages to the function which -aren't 4k, 2M, or 1G. Handle all intermediate orders as well, to avoid -hitting the BUG() at the switch() statement's "default" case. - -This is CVE-2021-28708 / part of XSA-388. - -Fixes: 3c352011c0d3 ("x86/PoD: shorten certain operations on higher order ranges") -Signed-off-by: Jan Beulich <jbeulich@suse.com> -Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> - ---- a/xen/arch/x86/mm/p2m-pod.c -+++ b/xen/arch/x86/mm/p2m-pod.c -@@ -112,15 +112,13 @@ p2m_pod_cache_add(struct p2m_domain *p2m - /* Then add to the appropriate populate-on-demand list. */ - switch ( order ) - { -- case PAGE_ORDER_1G: -- for ( i = 0; i < (1UL << PAGE_ORDER_1G); i += 1UL << PAGE_ORDER_2M ) -+ case PAGE_ORDER_2M ... PAGE_ORDER_1G: -+ for ( i = 0; i < (1UL << order); i += 1UL << PAGE_ORDER_2M ) - page_list_add_tail(page + i, &p2m->pod.super); - break; -- case PAGE_ORDER_2M: -- page_list_add_tail(page, &p2m->pod.super); -- break; -- case PAGE_ORDER_4K: -- page_list_add_tail(page, &p2m->pod.single); -+ case PAGE_ORDER_4K ... PAGE_ORDER_2M - 1: -+ for ( i = 0; i < (1UL << order); i += 1UL << PAGE_ORDER_4K ) -+ page_list_add_tail(page + i, &p2m->pod.single); - break; - default: - BUG(); |