f0208c9e42
CVE-2016-4439: scsi: esb: OOB write #1 (bz #1337503) CVE-2016-4441: scsi: esb: OOB write #2 (bz #1337506) Fix regression installing windows 7 with qxl/vga (bz #1339267) Fix crash with aarch64 gic-version=host and accel=tcg (bz #1339977)
74 lines
2.3 KiB
Diff
74 lines
2.3 KiB
Diff
From: Prasad J Pandit <pjp@fedoraproject.org>
|
|
Date: Thu, 19 May 2016 16:09:31 +0530
|
|
Subject: [PATCH] esp: check dma length before reading scsi
|
|
command(CVE-2016-4441)
|
|
|
|
The 53C9X Fast SCSI Controller(FSC) comes with an internal 16-byte
|
|
FIFO buffer. It is used to handle command and data transfer.
|
|
Routine get_cmd() uses DMA to read scsi commands into this buffer.
|
|
Add check to validate DMA length against buffer size to avoid any
|
|
overrun.
|
|
|
|
Fixes CVE-2016-4441.
|
|
|
|
Reported-by: Li Qiang <liqiang6-s@360.cn>
|
|
Cc: qemu-stable@nongnu.org
|
|
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
|
|
Message-Id: <1463654371-11169-3-git-send-email-ppandit@redhat.com>
|
|
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|
|
(cherry picked from commit 6c1fef6b59563cc415f21e03f81539ed4b33ad90)
|
|
---
|
|
hw/scsi/esp.c | 11 +++++++----
|
|
1 file changed, 7 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
|
|
index 01497e6..591c817 100644
|
|
--- a/hw/scsi/esp.c
|
|
+++ b/hw/scsi/esp.c
|
|
@@ -82,7 +82,7 @@ void esp_request_cancelled(SCSIRequest *req)
|
|
}
|
|
}
|
|
|
|
-static uint32_t get_cmd(ESPState *s, uint8_t *buf)
|
|
+static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen)
|
|
{
|
|
uint32_t dmalen;
|
|
int target;
|
|
@@ -92,6 +92,9 @@ static uint32_t get_cmd(ESPState *s, uint8_t *buf)
|
|
dmalen = s->rregs[ESP_TCLO];
|
|
dmalen |= s->rregs[ESP_TCMID] << 8;
|
|
dmalen |= s->rregs[ESP_TCHI] << 16;
|
|
+ if (dmalen > buflen) {
|
|
+ return 0;
|
|
+ }
|
|
s->dma_memory_read(s->dma_opaque, buf, dmalen);
|
|
} else {
|
|
dmalen = s->ti_size;
|
|
@@ -166,7 +169,7 @@ static void handle_satn(ESPState *s)
|
|
s->dma_cb = handle_satn;
|
|
return;
|
|
}
|
|
- len = get_cmd(s, buf);
|
|
+ len = get_cmd(s, buf, sizeof(buf));
|
|
if (len)
|
|
do_cmd(s, buf);
|
|
}
|
|
@@ -180,7 +183,7 @@ static void handle_s_without_atn(ESPState *s)
|
|
s->dma_cb = handle_s_without_atn;
|
|
return;
|
|
}
|
|
- len = get_cmd(s, buf);
|
|
+ len = get_cmd(s, buf, sizeof(buf));
|
|
if (len) {
|
|
do_busid_cmd(s, buf, 0);
|
|
}
|
|
@@ -192,7 +195,7 @@ static void handle_satn_stop(ESPState *s)
|
|
s->dma_cb = handle_satn_stop;
|
|
return;
|
|
}
|
|
- s->cmdlen = get_cmd(s, s->cmdbuf);
|
|
+ s->cmdlen = get_cmd(s, s->cmdbuf, sizeof(s->cmdbuf));
|
|
if (s->cmdlen) {
|
|
trace_esp_handle_satn_stop(s->cmdlen);
|
|
s->do_cmd = 1;
|