gnu: qemu: Fix CVE-2017-11334.

* gnu/packages/patches/qemu-CVE-2017-11334.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/virtualization.scm (qemu)[source]: Use it.

gnu/local.mk

@@ -975,6 +975,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/qemu-CVE-2017-8379.patch			\
   %D%/packages/patches/qemu-CVE-2017-8380.patch			\
   %D%/packages/patches/qemu-CVE-2017-9524.patch			\
+  %D%/packages/patches/qemu-CVE-2017-11334.patch		\
   %D%/packages/patches/qt4-ldflags.patch			\
   %D%/packages/patches/qtscript-disable-tests.patch		\
   %D%/packages/patches/quagga-reproducible-build.patch          \

gnu/packages/patches/qemu-CVE-2017-11334.patch

@@ -0,0 +1,52 @@
+Fix CVE-2017-11334:
+
+https://bugzilla.redhat.com/show_bug.cgi?id=1471638
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11334
+
+Patch copied from upstream source repository:
+
+http://git.qemu.org/?p=qemu.git;a=commitdiff;h=04bf2526ce87f21b32c9acba1c5518708c243ad0
+
+From 04bf2526ce87f21b32c9acba1c5518708c243ad0 Mon Sep 17 00:00:00 2001
+From: Prasad J Pandit <pjp@fedoraproject.org>
+Date: Wed, 12 Jul 2017 18:08:40 +0530
+Subject: [PATCH] exec: use qemu_ram_ptr_length to access guest ram
+
+When accessing guest's ram block during DMA operation, use
+'qemu_ram_ptr_length' to get ram block pointer. It ensures
+that DMA operation of given length is possible; And avoids
+any OOB memory access situations.
+
+Reported-by: Alex <broscutamaker@gmail.com>
+Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
+Message-Id: <20170712123840.29328-1-ppandit@redhat.com>
+Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
+---
+ exec.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/exec.c b/exec.c
+index a083ff89ad..ad103ce483 100644
+--- a/exec.c
++++ b/exec.c
+@@ -2929,7 +2929,7 @@ static MemTxResult address_space_write_continue(AddressSpace *as, hwaddr addr,
+             }
+         } else {
+             /* RAM case */
+-            ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
++            ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l);
+             memcpy(ptr, buf, l);
+             invalidate_and_set_dirty(mr, addr1, l);
+         }
+@@ -3020,7 +3020,7 @@ MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr,
+             }
+         } else {
+             /* RAM case */
+-            ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
++            ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l);
+             memcpy(buf, ptr, l);
+         }
+ 
+-- 
+2.13.3
+

gnu/packages/virtualization.scm

@@ -81,7 +81,8 @@
                                       "qemu-CVE-2017-8309.patch"
                                       "qemu-CVE-2017-8379.patch"
                                       "qemu-CVE-2017-8380.patch"
-                                      "qemu-CVE-2017-9524.patch"))
+                                      "qemu-CVE-2017-9524.patch"
+                                      "qemu-CVE-2017-11334.patch"))
              (sha256
               (base32
                "08mhfs0ndbkyqgw7fjaa9vjxf4dinrly656f6hjzvmaz7hzc677h"))))