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add CVE fixes

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CVE-2017-7539:
   qemu-nbd crashes due to undefined I/O coroutine
 CVE-2017-11434:
   slirp: out-of-bounds read while parsing dhcp options
 CVE-2017-11334:
   exec: oob access during dma operation
 CVE-2017-10806:
   usb-redirect: stack buffer overflow in debug logging
 CVE-2017-10664:
   qemu-nbd: server breaks with SIGPIPE upon client abort
 CVE-2017-9524:
   nbd: segmentation fault due to client non-negotiation
 CVE-2017-9503:
   scsi: null pointer dereference while processing megasas command
This commit is contained in:
Wolfgang Bumiller 2017-08-07 10:31:59 +02:00
parent 67af0fa481
commit e74c0f316d
24 changed files with 733 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
debian/patches/extra/0001-Revert-target-i386-disable-LINT0-after-reset.patch vendored
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@ -1,7 +1,7 @@
From 12949af5b296e6a5717df5189647559cc35677a4 Mon Sep 17 00:00:00 2001
From 3949cb837593d29db5c06cef51f405ee3250c4c1 Mon Sep 17 00:00:00 2001
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Mon, 4 Jul 2016 15:02:26 +0200
Subject: [PATCH 01/15] Revert "target-i386: disable LINT0 after reset"
Subject: [PATCH 01/23] Revert "target-i386: disable LINT0 after reset"
This reverts commit b8eb5512fd8a115f164edbbe897cdf8884920ccb.
---

6
debian/patches/extra/0002-qemu-img-wait-for-convert-coroutines-to-complete.patch vendored
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@ -1,7 +1,7 @@
From 40bb673c38565bb8660f15f088a85bb0fd12ab82 Mon Sep 17 00:00:00 2001
From e340d6c3321d3eb4e6f7854550cfdc94aa1c8143 Mon Sep 17 00:00:00 2001
From: Anton Nefedov <anton.nefedov@virtuozzo.com>
Date: Wed, 26 Apr 2017 11:33:15 +0300
Subject: [PATCH 02/15] qemu-img: wait for convert coroutines to complete
Subject: [PATCH 02/23] qemu-img: wait for convert coroutines to complete
On error path (like i/o error in one of the coroutines), it's required to
- wait for coroutines completion before cleaning the common structures
@ -18,7 +18,7 @@ Signed-off-by: Kevin Wolf <kwolf@redhat.com>
1 file changed, 11 insertions(+), 15 deletions(-)
diff --git a/qemu-img.c b/qemu-img.c
index 4f7f458dd2..cf9885b75b 100644
index b9d1ef7bb8..59f4f7f22a 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1761,13 +1761,13 @@ static void coroutine_fn convert_co_do_copy(void *opaque)

4
debian/patches/extra/0003-block-Do-not-unref-bs-file-on-error-in-BD-s-open.patch vendored
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@ -1,7 +1,7 @@
From 7abd8d3ceb29140469c3662fb53de6a4dfe4623e Mon Sep 17 00:00:00 2001
From 80a3ed331899e4710b33c4b2a88f1b7b888d6497 Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Thu, 13 Apr 2017 17:43:34 +0200
Subject: [PATCH 03/15] block: Do not unref bs->file on error in BD's open
Subject: [PATCH 03/23] block: Do not unref bs->file on error in BD's open
The block layer takes care of removing the bs->file child if the block
driver's bdrv_open()/bdrv_file_open() implementation fails. The block

4
debian/patches/extra/0004-9pfs-local-fix-unlink-of-alien-files-in-mapped-file-.patch vendored
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@ -1,7 +1,7 @@
From 575b9657b84e7c35d4a378448cdb43939fb5e730 Mon Sep 17 00:00:00 2001
From 952bdc64b03ffc3bdf3529b22f291ad26ef94d1b Mon Sep 17 00:00:00 2001
From: Greg Kurz <groug@kaod.org>
Date: Thu, 25 May 2017 10:30:13 +0200
Subject: [PATCH 04/15] 9pfs: local: fix unlink of alien files in mapped-file
Subject: [PATCH 04/23] 9pfs: local: fix unlink of alien files in mapped-file
mode
When trying to remove a file from a directory, both created in non-mapped

6
debian/patches/extra/0005-blockdev-use-drained_begin-end-for-qmp_block_resize.patch vendored
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@ -1,7 +1,7 @@
From a2486a266d8df715349ec0e325d0bedc0bdc0557 Mon Sep 17 00:00:00 2001
From 0720bbba9f7ebac6f4f0ae7a65cd687ac6f3c452 Mon Sep 17 00:00:00 2001
From: John Snow <jsnow@redhat.com>
Date: Wed, 10 May 2017 13:39:45 -0400
Subject: [PATCH 05/15] blockdev: use drained_begin/end for qmp_block_resize
Subject: [PATCH 05/23] blockdev: use drained_begin/end for qmp_block_resize
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1447551
@ -23,7 +23,7 @@ Signed-off-by: Kevin Wolf <kwolf@redhat.com>
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 43818dade1..d8ff508eff 100644
index 1eeffb0571..1dca232781 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2929,10 +2929,9 @@ void qmp_block_resize(bool has_device, const char *device,

4
debian/patches/extra/0006-aio-add-missing-aio_notify-to-aio_enable_external.patch vendored
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@ -1,7 +1,7 @@
From c9d7fd0fd5736afd1f6c508f2b5f1ae0608847bd Mon Sep 17 00:00:00 2001
From 28a204390093e5dfa0b4a2e94c06e807fe777c5f Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Mon, 8 May 2017 14:07:05 -0400
Subject: [PATCH 06/15] aio: add missing aio_notify() to aio_enable_external()
Subject: [PATCH 06/23] aio: add missing aio_notify() to aio_enable_external()
The main loop uses aio_disable_external()/aio_enable_external() to
temporarily disable processing of external AioContext clients like

4
debian/patches/extra/0007-virtio-serial-bus-Unset-hotplug-handler-when-unreali.patch vendored
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@ -1,7 +1,7 @@
From 48c670e522857fa54207794d3dfc014b4809079c Mon Sep 17 00:00:00 2001
From 691689ab216143f5fefd8e229ffd91086b9a261e Mon Sep 17 00:00:00 2001
From: Ladi Prosek <lprosek@redhat.com>
Date: Tue, 30 May 2017 10:59:43 +0200
Subject: [PATCH 07/15] virtio-serial-bus: Unset hotplug handler when unrealize
Subject: [PATCH 07/23] virtio-serial-bus: Unset hotplug handler when unrealize
Virtio serial device controls the lifetime of virtio-serial-bus and
virtio-serial-bus links back to the device via its hotplug-handler

4
debian/patches/extra/0008-virtio-serial-fix-segfault-on-disconnect.patch vendored
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@ -1,7 +1,7 @@
From 129083526210432c2233874be45e47a61c405db0 Mon Sep 17 00:00:00 2001
From 1b7f7a21084578b528c6a3faac29f46c5dbd6408 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Fri, 2 Jun 2017 10:54:24 +0100
Subject: [PATCH 08/15] virtio-serial: fix segfault on disconnect
Subject: [PATCH 08/23] virtio-serial: fix segfault on disconnect
Since commit d4c19cdeeb2f1e474bc426a6da261f1d7346eb5b ("virtio-serial:
add missing virtio_detach_element() call") the following commands may

4
debian/patches/extra/0009-e1000e-Fix-ICR-Other-causes-clear-logic.patch vendored
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@ -1,7 +1,7 @@
From 1b050be441ffab9c4babec630bbdd14f14c95022 Mon Sep 17 00:00:00 2001
From 02b34affd75f205f50445217ad28ef28002e0bf0 Mon Sep 17 00:00:00 2001
From: Sameeh Jubran <sameeh@daynix.com>
Date: Mon, 22 May 2017 14:26:22 +0300
Subject: [PATCH 09/15] e1000e: Fix ICR "Other" causes clear logic
Subject: [PATCH 09/23] e1000e: Fix ICR "Other" causes clear logic
This commit fixes a bug which causes the guest to hang. The bug was
observed upon a "receive overrun" (bit #6 of the ICR register)

4
debian/patches/extra/0010-mirror-Drop-permissions-on-s-target-on-completion.patch vendored
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@ -1,7 +1,7 @@
From 95166cdeaeaa9d00330483988b818abfcc473efe Mon Sep 17 00:00:00 2001
From 9c4164d74133304aaf7d77001e5ac8a22150df44 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Mon, 29 May 2017 14:08:32 +0200
Subject: [PATCH 10/15] mirror: Drop permissions on s->target on completion
Subject: [PATCH 10/23] mirror: Drop permissions on s->target on completion
This fixes an assertion failure that was triggered by qemu-iotests 129
on some CI host, while the same test case didn't seem to fail on other

4
debian/patches/extra/0011-vmw_pvscsi-check-message-ring-page-count-at-initiali.patch vendored
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@ -1,7 +1,7 @@
From d2eb933639fa12bfa36238c72b1c5a8fb59bdfcd Mon Sep 17 00:00:00 2001
From 1e709e6e073c7907676ea9263a1f92b1bd5fc9ac Mon Sep 17 00:00:00 2001
From: P J P <ppandit@redhat.com>
Date: Tue, 25 Apr 2017 18:36:23 +0530
Subject: [PATCH 11/15] vmw_pvscsi: check message ring page count at
Subject: [PATCH 11/23] vmw_pvscsi: check message ring page count at
initialisation
A guest could set the message ring page count to zero, resulting in

4
debian/patches/extra/0012-audio-release-capture-buffers.patch vendored
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@ -1,7 +1,7 @@
From 56ca431e96a6aadffdccecb882600dc780f13ad9 Mon Sep 17 00:00:00 2001
From 74f9fd9420fadd64a42ee8de780dc6de61864ea8 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 28 Apr 2017 09:56:12 +0200
Subject: [PATCH 12/15] audio: release capture buffers
Subject: [PATCH 12/23] audio: release capture buffers
AUD_add_capture() allocates two buffers which are never released.
Add the missing calls to AUD_del_capture().

4
debian/patches/extra/0013-input-limit-kbd-queue-depth.patch vendored
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@ -1,7 +1,7 @@
From e4f39e928710d19db0a0669b66520236197352aa Mon Sep 17 00:00:00 2001
From e96b198df364a2918896c41a9759b38aaebcf211 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 28 Apr 2017 10:42:37 +0200
Subject: [PATCH 13/15] input: limit kbd queue depth
Subject: [PATCH 13/23] input: limit kbd queue depth
Apply a limit to the number of items we accept into the keyboard queue.

4
debian/patches/extra/0014-scsi-avoid-an-off-by-one-error-in-megasas_mmio_write.patch vendored
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@ -1,7 +1,7 @@
From 3bf1e29359a1e22a2ecdffb50f124db275abf5bd Mon Sep 17 00:00:00 2001
From c442fb4a11d8dc527c90bf90a1fd1b15646f4c57 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Mon, 24 Apr 2017 17:36:34 +0530
Subject: [PATCH 14/15] scsi: avoid an off-by-one error in megasas_mmio_write
Subject: [PATCH 14/23] scsi: avoid an off-by-one error in megasas_mmio_write
While reading magic sequence(MFI_SEQ) in megasas_mmio_write,
an off-by-one error could occur as 's->adp_reset' index is not

4
debian/patches/extra/0015-9pfs-local-forbid-client-access-to-metadata-CVE-2017.patch vendored
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@ -1,7 +1,7 @@
From 6364ef68ee01ec566617ffa6982a8d551cec0f75 Mon Sep 17 00:00:00 2001
From 209fb3054000bd3a45da63e3758b9c220fba0a25 Mon Sep 17 00:00:00 2001
From: Greg Kurz <groug@kaod.org>
Date: Fri, 5 May 2017 14:48:08 +0200
Subject: [PATCH 15/15] 9pfs: local: forbid client access to metadata
Subject: [PATCH 15/23] 9pfs: local: forbid client access to metadata
(CVE-2017-7493)
When using the mapped-file security mode, we shouldn't let the client mess

115
debian/patches/extra/0016-megasas-do-not-read-DCMD-opcode-more-than-once-from-.patch vendored Normal file
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@ -0,0 +1,115 @@
From 95a82526f2bfd3e9f0ac65a1f2ed505b2429d9de Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 1 Jun 2017 17:18:23 +0200
Subject: [PATCH 16/23] megasas: do not read DCMD opcode more than once from
frame
Avoid TOC-TOU bugs by storing the DCMD opcode in the MegasasCmd
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
hw/scsi/megasas.c | 25 +++++++++++--------------
1 file changed, 11 insertions(+), 14 deletions(-)
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 804122ab05..887958481b 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -63,6 +63,7 @@ typedef struct MegasasCmd {
hwaddr pa;
hwaddr pa_size;
+ uint32_t dcmd_opcode;
union mfi_frame *frame;
SCSIRequest *req;
QEMUSGList qsg;
@@ -511,6 +512,7 @@ static MegasasCmd *megasas_enqueue_frame(MegasasState *s,
cmd->context &= (uint64_t)0xFFFFFFFF;
}
cmd->count = count;
+ cmd->dcmd_opcode = -1;
s->busy++;
if (s->consumer_pa) {
@@ -1559,22 +1561,21 @@ static const struct dcmd_cmd_tbl_t {
static int megasas_handle_dcmd(MegasasState *s, MegasasCmd *cmd)
{
- int opcode;
int retval = 0;
size_t len;
const struct dcmd_cmd_tbl_t *cmdptr = dcmd_cmd_tbl;
- opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
- trace_megasas_handle_dcmd(cmd->index, opcode);
+ cmd->dcmd_opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
+ trace_megasas_handle_dcmd(cmd->index, cmd->dcmd_opcode);
if (megasas_map_dcmd(s, cmd) < 0) {
return MFI_STAT_MEMORY_NOT_AVAILABLE;
}
- while (cmdptr->opcode != -1 && cmdptr->opcode != opcode) {
+ while (cmdptr->opcode != -1 && cmdptr->opcode != cmd->dcmd_opcode) {
cmdptr++;
}
len = cmd->iov_size;
if (cmdptr->opcode == -1) {
- trace_megasas_dcmd_unhandled(cmd->index, opcode, len);
+ trace_megasas_dcmd_unhandled(cmd->index, cmd->dcmd_opcode, len);
retval = megasas_dcmd_dummy(s, cmd);
} else {
trace_megasas_dcmd_enter(cmd->index, cmdptr->desc, len);
@@ -1589,13 +1590,11 @@ static int megasas_handle_dcmd(MegasasState *s, MegasasCmd *cmd)
static int megasas_finish_internal_dcmd(MegasasCmd *cmd,
SCSIRequest *req)
{
- int opcode;
int retval = MFI_STAT_OK;
int lun = req->lun;
- opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
- trace_megasas_dcmd_internal_finish(cmd->index, opcode, lun);
- switch (opcode) {
+ trace_megasas_dcmd_internal_finish(cmd->index, cmd->dcmd_opcode, lun);
+ switch (cmd->dcmd_opcode) {
case MFI_DCMD_PD_GET_INFO:
retval = megasas_pd_get_info_submit(req->dev, lun, cmd);
break;
@@ -1603,7 +1602,7 @@ static int megasas_finish_internal_dcmd(MegasasCmd *cmd,
retval = megasas_ld_get_info_submit(req->dev, lun, cmd);
break;
default:
- trace_megasas_dcmd_internal_invalid(cmd->index, opcode);
+ trace_megasas_dcmd_internal_invalid(cmd->index, cmd->dcmd_opcode);
retval = MFI_STAT_INVALID_DCMD;
break;
}
@@ -1824,7 +1823,6 @@ static void megasas_xfer_complete(SCSIRequest *req, uint32_t len)
{
MegasasCmd *cmd = req->hba_private;
uint8_t *buf;
- uint32_t opcode;
trace_megasas_io_complete(cmd->index, len);
@@ -1834,8 +1832,7 @@ static void megasas_xfer_complete(SCSIRequest *req, uint32_t len)
}
buf = scsi_req_get_buf(req);
- opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
- if (opcode == MFI_DCMD_PD_GET_INFO && cmd->iov_buf) {
+ if (cmd->dcmd_opcode == MFI_DCMD_PD_GET_INFO && cmd->iov_buf) {
struct mfi_pd_info *info = cmd->iov_buf;
if (info->inquiry_data[0] == 0x7f) {
@@ -1846,7 +1843,7 @@ static void megasas_xfer_complete(SCSIRequest *req, uint32_t len)
memcpy(info->vpd_page83, buf, len);
}
scsi_req_continue(req);
- } else if (opcode == MFI_DCMD_LD_GET_INFO) {
+ } else if (cmd->dcmd_opcode == MFI_DCMD_LD_GET_INFO) {
struct mfi_ld_info *info = cmd->iov_buf;
if (cmd->iov_buf) {
--
2.11.0

125
debian/patches/extra/0017-megasas-always-store-SCSIRequest-into-MegasasCmd.patch vendored Normal file
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@ -0,0 +1,125 @@
From d312b31b5c5e8e36c6e283bdb04b4784dd2e023b Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 1 Jun 2017 17:26:14 +0200
Subject: [PATCH 17/23] megasas: always store SCSIRequest* into MegasasCmd
This ensures that the request is unref'ed properly, and avoids a
segmentation fault in the new qtest testcase that is added.
This is CVE-2017-9503.
Reported-by: Zhangyanyu <zyy4013@stu.ouc.edu.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
hw/scsi/megasas.c | 31 ++++++++++++++++---------------
1 file changed, 16 insertions(+), 15 deletions(-)
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 887958481b..a0cafe3010 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -607,6 +607,9 @@ static void megasas_reset_frames(MegasasState *s)
static void megasas_abort_command(MegasasCmd *cmd)
{
/* Never abort internal commands. */
+ if (cmd->dcmd_opcode != -1) {
+ return;
+ }
if (cmd->req != NULL) {
scsi_req_cancel(cmd->req);
}
@@ -1014,7 +1017,6 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
uint64_t pd_size;
uint16_t pd_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
uint8_t cmdbuf[6];
- SCSIRequest *req;
size_t len, resid;
if (!cmd->iov_buf) {
@@ -1023,8 +1025,8 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
info->inquiry_data[0] = 0x7f; /* Force PQual 0x3, PType 0x1f */
info->vpd_page83[0] = 0x7f;
megasas_setup_inquiry(cmdbuf, 0, sizeof(info->inquiry_data));
- req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
- if (!req) {
+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
+ if (!cmd->req) {
trace_megasas_dcmd_req_alloc_failed(cmd->index,
"PD get info std inquiry");
g_free(cmd->iov_buf);
@@ -1033,26 +1035,26 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
}
trace_megasas_dcmd_internal_submit(cmd->index,
"PD get info std inquiry", lun);
- len = scsi_req_enqueue(req);
+ len = scsi_req_enqueue(cmd->req);
if (len > 0) {
cmd->iov_size = len;
- scsi_req_continue(req);
+ scsi_req_continue(cmd->req);
}
return MFI_STAT_INVALID_STATUS;
} else if (info->inquiry_data[0] != 0x7f && info->vpd_page83[0] == 0x7f) {
megasas_setup_inquiry(cmdbuf, 0x83, sizeof(info->vpd_page83));
- req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
- if (!req) {
+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
+ if (!cmd->req) {
trace_megasas_dcmd_req_alloc_failed(cmd->index,
"PD get info vpd inquiry");
return MFI_STAT_FLASH_ALLOC_FAIL;
}
trace_megasas_dcmd_internal_submit(cmd->index,
"PD get info vpd inquiry", lun);
- len = scsi_req_enqueue(req);
+ len = scsi_req_enqueue(cmd->req);
if (len > 0) {
cmd->iov_size = len;
- scsi_req_continue(req);
+ scsi_req_continue(cmd->req);
}
return MFI_STAT_INVALID_STATUS;
}
@@ -1214,7 +1216,6 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
struct mfi_ld_info *info = cmd->iov_buf;
size_t dcmd_size = sizeof(struct mfi_ld_info);
uint8_t cdb[6];
- SCSIRequest *req;
ssize_t len, resid;
uint16_t sdev_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
uint64_t ld_size;
@@ -1223,8 +1224,8 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
cmd->iov_buf = g_malloc0(dcmd_size);
info = cmd->iov_buf;
megasas_setup_inquiry(cdb, 0x83, sizeof(info->vpd_page83));
- req = scsi_req_new(sdev, cmd->index, lun, cdb, cmd);
- if (!req) {
+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cdb, cmd);
+ if (!cmd->req) {
trace_megasas_dcmd_req_alloc_failed(cmd->index,
"LD get info vpd inquiry");
g_free(cmd->iov_buf);
@@ -1233,10 +1234,10 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
}
trace_megasas_dcmd_internal_submit(cmd->index,
"LD get info vpd inquiry", lun);
- len = scsi_req_enqueue(req);
+ len = scsi_req_enqueue(cmd->req);
if (len > 0) {
cmd->iov_size = len;
- scsi_req_continue(req);
+ scsi_req_continue(cmd->req);
}
return MFI_STAT_INVALID_STATUS;
}
@@ -1865,7 +1866,7 @@ static void megasas_command_complete(SCSIRequest *req, uint32_t status,
return;
}
- if (cmd->req == NULL) {
+ if (cmd->dcmd_opcode != -1) {
/*
* Internal command complete
*/
--
2.11.0

81
debian/patches/extra/0018-nbd-Fully-initialize-client-in-case-of-failed-negoti.patch vendored Normal file
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@ -0,0 +1,81 @@
From 4dbc47f9d71b8a17b174ffed314988aa99dc4775 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Fri, 26 May 2017 22:04:21 -0500
Subject: [PATCH 18/23] nbd: Fully initialize client in case of failed
negotiation
If a non-NBD client connects to qemu-nbd, we would end up with
a SIGSEGV in nbd_client_put() because we were trying to
unregister the client's association to the export, even though
we skipped inserting the client into that list. Easy trigger
in two terminals:
$ qemu-nbd -p 30001 --format=raw file
$ nmap 127.0.0.1 -p 30001
nmap claims that it thinks it connected to a pago-services1
server (which probably means nmap could be updated to learn the
NBD protocol and give a more accurate diagnosis of the open
port - but that's not our problem), then terminates immediately,
so our call to nbd_negotiate() fails. The fix is to reorder
nbd_co_client_start() to ensure that all initialization occurs
before we ever try talking to a client in nbd_negotiate(), so
that the teardown sequence on negotiation failure doesn't fault
while dereferencing a half-initialized object.
While debugging this, I also noticed that nbd_update_server_watch()
called by nbd_client_closed() was still adding a channel to accept
the next client, even when the state was no longer RUNNING. That
is fixed by making nbd_can_accept() pay attention to the current
state.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1451614
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20170527030421.28366-1-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
nbd/server.c | 8 +++-----
qemu-nbd.c | 2 +-
2 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/nbd/server.c b/nbd/server.c
index 924a1fe2db..edfda84d43 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -1376,16 +1376,14 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
if (exp) {
nbd_export_get(exp);
+ QTAILQ_INSERT_TAIL(&exp->clients, client, next);
}
+ qemu_co_mutex_init(&client->send_lock);
+
if (nbd_negotiate(data)) {
client_close(client);
goto out;
}
- qemu_co_mutex_init(&client->send_lock);
-
- if (exp) {
- QTAILQ_INSERT_TAIL(&exp->clients, client, next);
- }
nbd_client_receive_next_request(client);
diff --git a/qemu-nbd.c b/qemu-nbd.c
index e080fb7c75..b44764eb87 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -324,7 +324,7 @@ out:
static int nbd_can_accept(void)
{
- return nb_fds < shared;
+ return state == RUNNING && nb_fds < shared;
}
static void nbd_export_closed(NBDExport *exp)
--
2.11.0

197
debian/patches/extra/0019-nbd-Fix-regression-on-resiliency-to-port-scan.patch vendored Normal file
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@ -0,0 +1,197 @@
From 97c7e46a9f8ae03e24df1d18d3b5e9df420f39ce Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Thu, 8 Jun 2017 17:26:17 -0500
Subject: [PATCH 19/23] nbd: Fix regression on resiliency to port scan
Back in qemu 2.5, qemu-nbd was immune to port probes (a transient
server would not quit, regardless of how many probe connections
came and went, until a connection actually negotiated). But we
broke that in commit ee7d7aa when removing the return value to
nbd_client_new(), although that patch also introduced a bug causing
an assertion failure on a client that fails negotiation. We then
made it worse during refactoring in commit 1a6245a (a segfault
before we could even assert); the (masked) assertion was cleaned
up in d3780c2 (still in 2.6), and just recently we finally fixed
the segfault ("nbd: Fully intialize client in case of failed
negotiation"). But that still means that ever since we added
TLS support to qemu-nbd, we have been vulnerable to an ill-timed
port-scan being able to cause a denial of service by taking down
qemu-nbd before a real client has a chance to connect.
Since negotiation is now handled asynchronously via coroutines,
we no longer have a synchronous point of return by re-adding a
return value to nbd_client_new(). So this patch instead wires
things up to pass the negotiation status through the close_fn
callback function.
Simple test across two terminals:
$ qemu-nbd -f raw -p 30001 file
$ nmap 127.0.0.1 -p 30001 && \
qemu-io -c 'r 0 512' -f raw nbd://localhost:30001
Note that this patch does not change what constitutes successful
negotiation (thus, a client must enter transmission phase before
that client can be considered as a reason to terminate the server
when the connection ends). Perhaps we may want to tweak things
in a later patch to also treat a client that uses NBD_OPT_ABORT
as being a 'successful' negotiation (the client correctly talked
the NBD protocol, and informed us it was not going to use our
export after all), but that's a discussion for another day.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1451614
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20170608222617.20376-1-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
blockdev-nbd.c | 6 +++++-
include/block/nbd.h | 2 +-
nbd/server.c | 24 +++++++++++++++---------
qemu-nbd.c | 4 ++--
4 files changed, 23 insertions(+), 13 deletions(-)
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 8a11807df3..8d7284ac56 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -27,6 +27,10 @@ typedef struct NBDServerData {
static NBDServerData *nbd_server;
+static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
+{
+ nbd_client_put(client);
+}
static gboolean nbd_accept(QIOChannel *ioc, GIOCondition condition,
gpointer opaque)
@@ -46,7 +50,7 @@ static gboolean nbd_accept(QIOChannel *ioc, GIOCondition condition,
qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
nbd_client_new(NULL, cioc,
nbd_server->tlscreds, NULL,
- nbd_client_put);
+ nbd_blockdev_client_closed);
object_unref(OBJECT(cioc));
return TRUE;
}
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 3e373f0498..b69c30d063 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -160,7 +160,7 @@ void nbd_client_new(NBDExport *exp,
QIOChannelSocket *sioc,
QCryptoTLSCreds *tlscreds,
const char *tlsaclname,
- void (*close)(NBDClient *));
+ void (*close_fn)(NBDClient *, bool));
void nbd_client_get(NBDClient *client);
void nbd_client_put(NBDClient *client);
diff --git a/nbd/server.c b/nbd/server.c
index edfda84d43..a98bb21a0a 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -81,7 +81,7 @@ static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
struct NBDClient {
int refcount;
- void (*close)(NBDClient *client);
+ void (*close_fn)(NBDClient *client, bool negotiated);
bool no_zeroes;
NBDExport *exp;
@@ -796,7 +796,7 @@ void nbd_client_put(NBDClient *client)
}
}
-static void client_close(NBDClient *client)
+static void client_close(NBDClient *client, bool negotiated)
{
if (client->closing) {
return;
@@ -811,8 +811,8 @@ static void client_close(NBDClient *client)
NULL);
/* Also tell the client, so that they release their reference. */
- if (client->close) {
- client->close(client);
+ if (client->close_fn) {
+ client->close_fn(client, negotiated);
}
}
@@ -993,7 +993,7 @@ void nbd_export_close(NBDExport *exp)
nbd_export_get(exp);
QTAILQ_FOREACH_SAFE(client, &exp->clients, next, next) {
- client_close(client);
+ client_close(client, true);
}
nbd_export_set_name(exp, NULL);
nbd_export_set_description(exp, NULL);
@@ -1355,7 +1355,7 @@ done:
out:
nbd_request_put(req);
- client_close(client);
+ client_close(client, true);
nbd_client_put(client);
}
@@ -1381,7 +1381,7 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
qemu_co_mutex_init(&client->send_lock);
if (nbd_negotiate(data)) {
- client_close(client);
+ client_close(client, false);
goto out;
}
@@ -1391,11 +1391,17 @@ out:
g_free(data);
}
+/*
+ * Create a new client listener on the given export @exp, using the
+ * given channel @sioc. Begin servicing it in a coroutine. When the
+ * connection closes, call @close_fn with an indication of whether the
+ * client completed negotiation.
+ */
void nbd_client_new(NBDExport *exp,
QIOChannelSocket *sioc,
QCryptoTLSCreds *tlscreds,
const char *tlsaclname,
- void (*close_fn)(NBDClient *))
+ void (*close_fn)(NBDClient *, bool))
{
NBDClient *client;
NBDClientNewData *data = g_new(NBDClientNewData, 1);
@@ -1412,7 +1418,7 @@ void nbd_client_new(NBDExport *exp,
object_ref(OBJECT(client->sioc));
client->ioc = QIO_CHANNEL(sioc);
object_ref(OBJECT(client->ioc));
- client->close = close_fn;
+ client->close_fn = close_fn;
data->client = client;
data->co = qemu_coroutine_create(nbd_co_client_start, data);
diff --git a/qemu-nbd.c b/qemu-nbd.c
index b44764eb87..483dd77a77 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -335,10 +335,10 @@ static void nbd_export_closed(NBDExport *exp)
static void nbd_update_server_watch(void);
-static void nbd_client_closed(NBDClient *client)
+static void nbd_client_closed(NBDClient *client, bool negotiated)
{
nb_fds--;
- if (nb_fds == 0 && !persistent && state == RUNNING) {
+ if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
state = TERMINATE;
}
nbd_update_server_watch();
--
2.11.0

47
debian/patches/extra/0020-qemu-nbd-Ignore-SIGPIPE.patch vendored Normal file
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@ -0,0 +1,47 @@
From 36d48727155c4a440ee23c703778533f87002964 Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Sun, 11 Jun 2017 14:37:14 +0200
Subject: [PATCH 20/23] qemu-nbd: Ignore SIGPIPE
qemu proper has done so for 13 years
(8a7ddc38a60648257dc0645ab4a05b33d6040063), qemu-img and qemu-io have
done so for four years (526eda14a68d5b3596be715505289b541288ef2a).
Ignoring this signal is especially important in qemu-nbd because
otherwise a client can easily take down the qemu-nbd server by dropping
the connection when the server wants to send something, for example:
$ qemu-nbd -x foo -f raw -t null-co:// &
[1] 12726
$ qemu-io -c quit nbd://localhost/bar
can't open device nbd://localhost/bar: No export with name 'bar' available
[1] + 12726 broken pipe qemu-nbd -x foo -f raw -t null-co://
In this case, the client sends an NBD_OPT_ABORT and closes the
connection (because it is not required to wait for a reply), but the
server replies with an NBD_REP_ACK (because it is required to reply).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20170611123714.31292-1-mreitz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
qemu-nbd.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 483dd77a77..5deb37e03e 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -581,6 +581,10 @@ int main(int argc, char **argv)
sa_sigterm.sa_handler = termsig_handler;
sigaction(SIGTERM, &sa_sigterm, NULL);
+#ifdef CONFIG_POSIX
+ signal(SIGPIPE, SIG_IGN);
+#endif
+
module_call_init(MODULE_INIT_TRACE);
qcrypto_init(&error_fatal);
--
2.11.0

50
debian/patches/extra/0021-usb-redir-fix-stack-overflow-in-usbredir_log_data.patch vendored Normal file
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@ -0,0 +1,50 @@
From ce2b5a53421794394fc81d155837b1c8ac79ea15 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 9 May 2017 13:01:28 +0200
Subject: [PATCH 21/23] usb-redir: fix stack overflow in usbredir_log_data
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Don't reinvent a broken wheel, just use the hexdump function we have.
Impact: low, broken code doesn't run unless you have debug logging
enabled.
Reported-by: 李强 <liqiang6-s@360.cn>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20170509110128.27261-1-kraxel@redhat.com
---
hw/usb/redirect.c | 13 +------------
1 file changed, 1 insertion(+), 12 deletions(-)
diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
index 0efe62f725..eb70dc7218 100644
--- a/hw/usb/redirect.c
+++ b/hw/usb/redirect.c
@@ -229,21 +229,10 @@ static void usbredir_log(void *priv, int level, const char *msg)
static void usbredir_log_data(USBRedirDevice *dev, const char *desc,
const uint8_t *data, int len)
{
- int i, j, n;
-
if (dev->debug < usbredirparser_debug_data) {
return;
}
-
- for (i = 0; i < len; i += j) {
- char buf[128];
-
- n = sprintf(buf, "%s", desc);
- for (j = 0; j < 8 && i + j < len; j++) {
- n += sprintf(buf + n, " %02X", data[i + j]);
- }
- error_report("%s", buf);
- }
+ qemu_hexdump((char *)data, stderr, desc, len);
}
/*
--
2.11.0

43
debian/patches/extra/0022-exec-use-qemu_ram_ptr_length-to-access-guest-ram.patch vendored Normal file
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@ -0,0 +1,43 @@
From d587bf95f1099fd253e6a7b768bf73d4e25de07c 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 22/23] 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>
---
exec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/exec.c b/exec.c
index c97ef4a8da..72d636a4fb 100644
--- a/exec.c
+++ b/exec.c
@@ -2765,7 +2765,7 @@ 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);
}
@@ -2856,7 +2856,7 @@ 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);
}
--
2.11.0

35
debian/patches/extra/0023-slirp-check-len-against-dhcp-options-array-end.patch vendored Normal file
View File

@ -0,0 +1,35 @@
From f3b5bdea7ea51404bbf88bea6fc8887586a423b2 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Mon, 17 Jul 2017 17:33:26 +0530
Subject: [PATCH 23/23] slirp: check len against dhcp options array end
While parsing dhcp options string in 'dhcp_decode', if an options'
length 'len' appeared towards the end of 'bp_vend' array, ensuing
read could lead to an OOB memory access issue. Add check to avoid it.
This is CVE-2017-11434.
Reported-by: Reno Robert <renorobert@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---
slirp/bootp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/slirp/bootp.c b/slirp/bootp.c
index 5a4646c182..5dd1a415b5 100644
--- a/slirp/bootp.c
+++ b/slirp/bootp.c
@@ -123,6 +123,9 @@ static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type,
if (p >= p_end)
break;
len = *p++;
+ if (p + len > p_end) {
+ break;
+ }
DPRINTF("dhcp: tag=%d len=%d\n", tag, len);
switch(tag) {
--
2.11.0

8
debian/patches/series vendored
View File

@ -41,3 +41,11 @@ extra/0012-audio-release-capture-buffers.patch
extra/0013-input-limit-kbd-queue-depth.patch
extra/0014-scsi-avoid-an-off-by-one-error-in-megasas_mmio_write.patch
extra/0015-9pfs-local-forbid-client-access-to-metadata-CVE-2017.patch
extra/0016-megasas-do-not-read-DCMD-opcode-more-than-once-from-.patch
extra/0017-megasas-always-store-SCSIRequest-into-MegasasCmd.patch
extra/0018-nbd-Fully-initialize-client-in-case-of-failed-negoti.patch
extra/0019-nbd-Fix-regression-on-resiliency-to-port-scan.patch
extra/0020-qemu-nbd-Ignore-SIGPIPE.patch
extra/0021-usb-redir-fix-stack-overflow-in-usbredir_log_data.patch
extra/0022-exec-use-qemu_ram_ptr_length-to-access-guest-ram.patch
extra/0023-slirp-check-len-against-dhcp-options-array-end.patch