File 0071-exec-use-qemu_ram_ptr_length-to-acc.patch of Package qemu

Overview Repositories Revisions Requests Users Attributes Meta

File 0071-exec-use-qemu_ram_ptr_length-to-acc.patch of Package qemu (Revision 515599a356118c5174e173f9a92a564f)

Currently displaying revision 515599a356118c5174e173f9a92a564f , Show latest

From f6658a500e003e91225f59bc2c2305c6b7d2f0d1 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>
(cherry picked from commit 04bf2526ce87f21b32c9acba1c5518708c243ad0)
[BR: BSC#1048902 CVE-2017-11334]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 exec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/exec.c b/exec.c
index b47b3f9096..1de9107b61 100644
--- a/exec.c
+++ b/exec.c
@@ -2767,7 +2767,7 @@ 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);
         }
@@ -2858,7 +2858,7 @@ 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);
         }

Places

File 0071-exec-use-qemu_ram_ptr_length-to-acc.patch of Package qemu (Revision 515599a356118c5174e173f9a92a564f)

Places