diff options
Diffstat (limited to 'system/xen/xsa/xsa251.patch')
| -rw-r--r-- | system/xen/xsa/xsa251.patch | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/system/xen/xsa/xsa251.patch b/system/xen/xsa/xsa251.patch new file mode 100644 index 0000000000..582ef622eb --- /dev/null +++ b/system/xen/xsa/xsa251.patch @@ -0,0 +1,21 @@ +From: Jan Beulich <jbeulich@suse.com> +Subject: x86/paging: don't unconditionally BUG() on finding SHARED_M2P_ENTRY + +PV guests can fully control the values written into the P2M. + +This is XSA-251. + +Signed-off-by: Jan Beulich <jbeulich@suse.com> +Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> + +--- a/xen/arch/x86/mm/paging.c ++++ b/xen/arch/x86/mm/paging.c +@@ -274,7 +274,7 @@ void paging_mark_pfn_dirty(struct domain + return; + + /* Shared MFNs should NEVER be marked dirty */ +- BUG_ON(SHARED_M2P(pfn_x(pfn))); ++ BUG_ON(paging_mode_translate(d) && SHARED_M2P(pfn_x(pfn))); + + /* + * Values with the MSB set denote MFNs that aren't really part of the |