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qemu: Security fix CVE-2016-4439

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affects qemu < 2.6.0

(From OE-Core rev: 628b9bfc91a6f73a5dfff7ade1819ea6a2db7cf0)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Armin Kuster 2016-09-19 19:48:42 -07:00 committed by Richard Purdie
parent 98e7d8a9a0
commit 931a6e6d5e
2 changed files with 47 additions and 0 deletions
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46
meta/recipes-devtools/qemu/qemu/CVE-2016-4439.patch Normal file
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@ -0,0 +1,46 @@
From 0a5e3685ea10c578f8063ca0dbb009af45693d85 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Thu, 19 May 2016 16:09:30 +0530
Subject: [PATCH] esp: check command buffer length before write(CVE-2016-4439)
The 53C9X Fast SCSI Controller(FSC) comes with an internal 16-byte
FIFO buffer. It is used to handle command and data transfer. While
writing to this command buffer 's->cmdbuf[TI_BUFSZ=16]', a check
was missing to validate input length. Add check to avoid OOB write
access.
Fixes CVE-2016-4439.
Reported-by: Li Qiang <liqiang6-s@360.cn>
Cc: qemu-stable@nongnu.org
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <1463654371-11169-2-git-send-email-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit c98c6c105f66f05aa0b7c1d2a4a3f716450907ef)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Upstream-Status: Backport
CVE: CVE-2016-4439
Signed-off-by: Armin Kuster <akuster@mvista.com>
---
hw/scsi/esp.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
Index: qemu-2.4.0/hw/scsi/esp.c
===================================================================
--- qemu-2.4.0.orig/hw/scsi/esp.c
+++ qemu-2.4.0/hw/scsi/esp.c
@@ -446,7 +446,11 @@ void esp_reg_write(ESPState *s, uint32_t
break;
case ESP_FIFO:
if (s->do_cmd) {
- s->cmdbuf[s->cmdlen++] = val & 0xff;
+ if (s->cmdlen < TI_BUFSZ) {
+ s->cmdbuf[s->cmdlen++] = val & 0xff;
+ } else {
+ trace_esp_error_fifo_overrun();
+ }
} else if (s->ti_size == TI_BUFSZ - 1) {
trace_esp_error_fifo_overrun();
} else {

1
meta/recipes-devtools/qemu/qemu_2.4.0.bb
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@ -25,6 +25,7 @@ SRC_URI += "file://configure-fix-Darwin-target-detection.patch \
file://CVE-2016-3712_p2.patch \
file://CVE-2016-3712_p3.patch \
file://CVE-2016-3712_p4.patch \
file://CVE-2016-4439.patch \
"
SRC_URI_prepend = "http://wiki.qemu-project.org/download/${BP}.tar.bz2"
SRC_URI[md5sum] = "186ee8194140a484a455f8e3c74589f4"