diff options
Diffstat (limited to 'system/xen/patches/xsa176.patch')
| -rw-r--r-- | system/xen/patches/xsa176.patch | 45 |
1 files changed, 0 insertions, 45 deletions
diff --git a/system/xen/patches/xsa176.patch b/system/xen/patches/xsa176.patch deleted file mode 100644 index 1c15abd3e3..0000000000 --- a/system/xen/patches/xsa176.patch +++ /dev/null @@ -1,45 +0,0 @@ -x86/mm: fully honor PS bits in guest page table walks - -In L4 entries it is currently unconditionally reserved (and hence -should, when set, always result in a reserved bit page fault), and is -reserved on hardware not supporting 1Gb pages (and hence should, when -set, similarly cause a reserved bit page fault on such hardware). - -This is CVE-2016-4480 / XSA-176. - -Signed-off-by: Jan Beulich <jbeulich@suse.com> -Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> -Tested-by: Andrew Cooper <andrew.cooper3@citrix.com> - ---- a/xen/arch/x86/mm/guest_walk.c -+++ b/xen/arch/x86/mm/guest_walk.c -@@ -226,6 +226,11 @@ guest_walk_tables(struct vcpu *v, struct - rc |= _PAGE_PRESENT; - goto out; - } -+ if ( gflags & _PAGE_PSE ) -+ { -+ rc |= _PAGE_PSE | _PAGE_INVALID_BIT; -+ goto out; -+ } - rc |= ((gflags & mflags) ^ mflags); - - /* Map the l3 table */ -@@ -247,7 +252,7 @@ guest_walk_tables(struct vcpu *v, struct - } - rc |= ((gflags & mflags) ^ mflags); - -- pse1G = (gflags & _PAGE_PSE) && guest_supports_1G_superpages(v); -+ pse1G = !!(gflags & _PAGE_PSE); - - if ( pse1G ) - { -@@ -267,6 +272,8 @@ guest_walk_tables(struct vcpu *v, struct - /* _PAGE_PSE_PAT not set: remove _PAGE_PAT from flags. */ - flags &= ~_PAGE_PAT; - -+ if ( !guest_supports_1G_superpages(v) ) -+ rc |= _PAGE_PSE | _PAGE_INVALID_BIT; - if ( gfn_x(start) & GUEST_L3_GFN_MASK & ~0x1 ) - rc |= _PAGE_INVALID_BITS; - |