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------------------------------------------------------------------------
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f37f50b |
*From*: P J P
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
*Subject*: [Qemu-devel] [PATCH 2/2] scsi: check dma length before
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
reading scsi command(CVE-2016-4441)
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f37f50b |
*Date*: Thu, 19 May 2016 16:09:31 +0530
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f37f50b |
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------------------------------------------------------------------------
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f37f50b |
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f37f50b |
From: Prasad J Pandit <address@hidden>
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
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f37f50b |
The 53C9X Fast SCSI Controller(FSC) comes with an internal 16-byte
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
FIFO buffer. It is used to handle command and data transfer.
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f37f50b |
Routine get_cmd() uses DMA to read scsi commands into this buffer.
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
Add check to validate DMA length against buffer size to avoid any
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
overrun.
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f37f50b |
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f37f50b |
Fixes CVE-2016-4441
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f37f50b |
Reported-by: Li Qiang <address@hidden>
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
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f37f50b |
Signed-off-by: Prasad J Pandit <address@hidden>
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
---
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f37f50b |
hw/scsi/esp.c | 11 +++++++----
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f37f50b |
1 file changed, 7 insertions(+), 4 deletions(-)
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f37f50b |
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f37f50b |
diff --git a/tools/qemu-xen/hw/scsi/esp.c b/tools/qemu-xen/hw/scsi/esp.c
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f37f50b |
index 01497e6..591c817 100644
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f37f50b |
--- a/tools/qemu-xen/hw/scsi/esp.c
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
+++ b/tools/qemu-xen/hw/scsi/esp.c
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f37f50b |
@@ -82,7 +82,7 @@ void esp_request_cancelled(SCSIRequest *req)
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f37f50b |
}
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f37f50b |
}
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f37f50b |
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f37f50b |
-static uint32_t get_cmd(ESPState *s, uint8_t *buf)
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
+static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen)
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
{
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f37f50b |
uint32_t dmalen;
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
int target;
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f37f50b |
@@ -92,6 +92,9 @@ static uint32_t get_cmd(ESPState *s, uint8_t *buf)
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
f37f50b |
dmalen = s->rregs[ESP_TCLO];
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f37f50b |
dmalen |= s->rregs[ESP_TCMID] << 8;
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dmalen |= s->rregs[ESP_TCHI] << 16;
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f37f50b |
+ if (dmalen > buflen) {
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f37f50b |
+ return 0;
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f37f50b |
+ }
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f37f50b |
s->dma_memory_read(s->dma_opaque, buf, dmalen);
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} else {
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dmalen = s->ti_size;
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f37f50b |
@@ -166,7 +169,7 @@ static void handle_satn(ESPState *s)
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s->dma_cb = handle_satn;
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f37f50b |
return;
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}
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f37f50b |
- len = get_cmd(s, buf);
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f37f50b |
+ len = get_cmd(s, buf, sizeof(buf));
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f37f50b |
if (len)
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f37f50b |
do_cmd(s, buf);
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}
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f37f50b |
@@ -180,7 +183,7 @@ static void handle_s_without_atn(ESPState *s)
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f37f50b |
s->dma_cb = handle_s_without_atn;
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return;
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}
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f37f50b |
- len = get_cmd(s, buf);
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f37f50b |
+ len = get_cmd(s, buf, sizeof(buf));
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f37f50b |
if (len) {
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f37f50b |
do_busid_cmd(s, buf, 0);
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f37f50b |
}
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f37f50b |
@@ -192,7 +195,7 @@ static void handle_satn_stop(ESPState *s)
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f37f50b |
s->dma_cb = handle_satn_stop;
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f37f50b |
return;
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f37f50b |
}
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f37f50b |
- s->cmdlen = get_cmd(s, s->cmdbuf);
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f37f50b |
+ s->cmdlen = get_cmd(s, s->cmdbuf, sizeof(s->cmdbuf));
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f37f50b |
if (s->cmdlen) {
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f37f50b |
trace_esp_handle_satn_stop(s->cmdlen);
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f37f50b |
s->do_cmd = 1;
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f37f50b |
--
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f37f50b |
2.5.5
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