[Xen-changelog] [xen stable-4.4] pre-fill structures for certain HYPERVISOR_xen_version sub-ops

[patchbot@xxxxxxx]

commit 40ab3d6b78a9f5a8a22bb333fdca0309e4a2fb4b
Author:     Aaron Adams <Aaron.Adams@xxxxxxxxxxxx>
AuthorDate: Thu Mar 5 13:46:24 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Mar 5 13:46:24 2015 +0100

    pre-fill structures for certain HYPERVISOR_xen_version sub-ops
    
    ... avoiding to pass hypervisor stack contents back to the caller
    through space unused by the respective strings.
    
    This is CVE-2015-2045 / XSA-122.
    
    Signed-off-by: Aaron Adams <Aaron.Adams@xxxxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    master commit: fe2e079f642effb3d24a6e1a7096ef26e691d93e
    master date: 2015-03-05 13:35:54 +0100
---
 xen/common/kernel.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/xen/common/kernel.c b/xen/common/kernel.c
index b371f8f..0e34e59 100644
--- a/xen/common/kernel.c
+++ b/xen/common/kernel.c
@@ -233,6 +233,8 @@ DO(xen_version)(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
     case XENVER_extraversion:
     {
         xen_extraversion_t extraversion;
+
+        memset(extraversion, 0, sizeof(extraversion));
         safe_strcpy(extraversion, xen_extra_version());
         if ( copy_to_guest(arg, extraversion, ARRAY_SIZE(extraversion)) )
             return -EFAULT;
@@ -242,6 +244,8 @@ DO(xen_version)(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
     case XENVER_compile_info:
     {
         struct xen_compile_info info;
+
+        memset(&info, 0, sizeof(info));
         safe_strcpy(info.compiler,       xen_compiler());
         safe_strcpy(info.compile_by,     xen_compile_by());
         safe_strcpy(info.compile_domain, xen_compile_domain());
@@ -277,6 +281,8 @@ DO(xen_version)(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
     case XENVER_changeset:
     {
         xen_changeset_info_t chgset;
+
+        memset(chgset, 0, sizeof(chgset));
         safe_strcpy(chgset, xen_changeset());
         if ( copy_to_guest(arg, chgset, ARRAY_SIZE(chgset)) )
             return -EFAULT;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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