1 files changed, 75 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2016-6351_p1.patch b/meta/recipes-devtools/qemu/qemu/CVE-2016-6351_p1.patch
new file mode 100644
index 0000000000..350ae2becc
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2016-6351_p1.patch
@@ -0,0 +1,75 @@
+From 926cde5f3e4d2504ed161ed0cb771ac7cad6fd11 Mon Sep 17 00:00:00 2001
+From: Prasad J Pandit <pjp@fedoraproject.org>
+Date: Thu, 16 Jun 2016 00:22:35 +0200
+Subject: [PATCH] scsi: esp: make cmdbuf big enough for maximum CDB size
+
+While doing DMA read into ESP command buffer 's->cmdbuf', it could
+write past the 's->cmdbuf' area, if it was transferring more than 16
+bytes.  Increase the command buffer size to 32, which is maximum when
+'s->do_cmd' is set, and add a check on 'len' to avoid OOB access.
+
+Reported-by: Li Qiang <liqiang6-s@360.cn>
+Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
+Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
+
+Upstream-Status: Backport
+CVE: CVE-2016-6351 patch1
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ hw/scsi/esp.c         | 6 ++++--
+ include/hw/scsi/esp.h | 3 ++-
+ 2 files changed, 6 insertions(+), 3 deletions(-)
+
+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
+@@ -241,6 +241,8 @@ static void esp_do_dma(ESPState *s)
+     len = s->dma_left;
+     if (s->do_cmd) {
+         trace_esp_do_dma(s->cmdlen, len);
++        assert (s->cmdlen <= sizeof(s->cmdbuf) &&
++                len <= sizeof(s->cmdbuf) - s->cmdlen);
+         s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len);
+         s->ti_size = 0;
+         s->cmdlen = 0;
+@@ -340,7 +342,7 @@ static void handle_ti(ESPState *s)
+     s->dma_counter = dmalen;
+ 
+     if (s->do_cmd)
+-        minlen = (dmalen < 32) ? dmalen : 32;
++        minlen = (dmalen < ESP_CMDBUF_SZ) ? dmalen : ESP_CMDBUF_SZ;
+     else if (s->ti_size < 0)
+         minlen = (dmalen < -s->ti_size) ? dmalen : -s->ti_size;
+     else
+@@ -446,7 +448,7 @@ void esp_reg_write(ESPState *s, uint32_t
+         break;
+     case ESP_FIFO:
+         if (s->do_cmd) {
+-            if (s->cmdlen < TI_BUFSZ) {
++            if (s->cmdlen < ESP_CMDBUF_SZ) {
+                 s->cmdbuf[s->cmdlen++] = val & 0xff;
+             } else {
+                 trace_esp_error_fifo_overrun();
+Index: qemu-2.4.0/include/hw/scsi/esp.h
+===================================================================
+--- qemu-2.4.0.orig/include/hw/scsi/esp.h
++++ qemu-2.4.0/include/hw/scsi/esp.h
+@@ -14,6 +14,7 @@ void esp_init(hwaddr espaddr, int it_shi
+ 
+ #define ESP_REGS 16
+ #define TI_BUFSZ 16
++#define ESP_CMDBUF_SZ 32
+ 
+ typedef struct ESPState ESPState;
+ 
+@@ -31,7 +32,7 @@ struct ESPState {
+     SCSIBus bus;
+     SCSIDevice *current_dev;
+     SCSIRequest *current_req;
+-    uint8_t cmdbuf[TI_BUFSZ];
++    uint8_t cmdbuf[ESP_CMDBUF_SZ];
+     uint32_t cmdlen;
+     uint32_t do_cmd;
+