mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-12-25 13:58:15 -05:00
ca5e404f9a
* gnu/packages/patches/qemu-CVE-2020-1711.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it. * gnu/packages/virtualization.scm (qemu)[source]: Use it.
69 lines
2.5 KiB
Diff
69 lines
2.5 KiB
Diff
Fix CVE-2020-1711:
|
|
|
|
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1711
|
|
|
|
Patch copied from upstream source repository:
|
|
|
|
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=693fd2acdf14dd86c0bf852610f1c2cca80a74dc
|
|
|
|
From 693fd2acdf14dd86c0bf852610f1c2cca80a74dc Mon Sep 17 00:00:00 2001
|
|
From: Felipe Franciosi <felipe@nutanix.com>
|
|
Date: Thu, 23 Jan 2020 12:44:59 +0000
|
|
Subject: [PATCH] iscsi: Cap block count from GET LBA STATUS (CVE-2020-1711)
|
|
|
|
When querying an iSCSI server for the provisioning status of blocks (via
|
|
GET LBA STATUS), Qemu only validates that the response descriptor zero's
|
|
LBA matches the one requested. Given the SCSI spec allows servers to
|
|
respond with the status of blocks beyond the end of the LUN, Qemu may
|
|
have its heap corrupted by clearing/setting too many bits at the end of
|
|
its allocmap for the LUN.
|
|
|
|
A malicious guest in control of the iSCSI server could carefully program
|
|
Qemu's heap (by selectively setting the bitmap) and then smash it.
|
|
|
|
This limits the number of bits that iscsi_co_block_status() will try to
|
|
update in the allocmap so it can't overflow the bitmap.
|
|
|
|
Fixes: CVE-2020-1711
|
|
Cc: qemu-stable@nongnu.org
|
|
Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
|
|
Signed-off-by: Peter Turschmid <peter.turschm@nutanix.com>
|
|
Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
|
|
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
|
|
---
|
|
block/iscsi.c | 5 +++--
|
|
1 file changed, 3 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/block/iscsi.c b/block/iscsi.c
|
|
index 2aea7e3f13..cbd57294ab 100644
|
|
--- a/block/iscsi.c
|
|
+++ b/block/iscsi.c
|
|
@@ -701,7 +701,7 @@ static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs,
|
|
struct scsi_get_lba_status *lbas = NULL;
|
|
struct scsi_lba_status_descriptor *lbasd = NULL;
|
|
struct IscsiTask iTask;
|
|
- uint64_t lba;
|
|
+ uint64_t lba, max_bytes;
|
|
int ret;
|
|
|
|
iscsi_co_init_iscsitask(iscsilun, &iTask);
|
|
@@ -721,6 +721,7 @@ static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs,
|
|
}
|
|
|
|
lba = offset / iscsilun->block_size;
|
|
+ max_bytes = (iscsilun->num_blocks - lba) * iscsilun->block_size;
|
|
|
|
qemu_mutex_lock(&iscsilun->mutex);
|
|
retry:
|
|
@@ -764,7 +765,7 @@ retry:
|
|
goto out_unlock;
|
|
}
|
|
|
|
- *pnum = (int64_t) lbasd->num_blocks * iscsilun->block_size;
|
|
+ *pnum = MIN((int64_t) lbasd->num_blocks * iscsilun->block_size, max_bytes);
|
|
|
|
if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
|
|
lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
|
|
--
|
|
2.25.0
|
|
|