Re: [meta-virtualization] [hardknott][PATCH] libvirt: fix CVE-2021-3975

[Bruce Ashfield <bruce.ashfield@gmail.com>]

merged to hardknott.

Bruce

In message: [meta-virtualization] [hardknott][PATCH] libvirt: fix CVE-2021-3975
on 29/01/2022 Changqing Li wrote:

> From: Changqing Li <changqing.li@windriver.com>
> 
> Signed-off-by: Changqing Li <changqing.li@windriver.com>
> ---
>  .../libvirt/libvirt/CVE-2021-3975.patch       | 43 +++++++++++++++++++
>  recipes-extended/libvirt/libvirt_6.3.0.bb     |  1 +
>  2 files changed, 44 insertions(+)
>  create mode 100644 recipes-extended/libvirt/libvirt/CVE-2021-3975.patch
> 
> diff --git a/recipes-extended/libvirt/libvirt/CVE-2021-3975.patch b/recipes-extended/libvirt/libvirt/CVE-2021-3975.patch
> new file mode 100644
> index 0000000..72cee94
> --- /dev/null
> +++ b/recipes-extended/libvirt/libvirt/CVE-2021-3975.patch
> @@ -0,0 +1,43 @@
> +From 30de45c73106cacfc0aacc8f11c88e1aa5372d77 Mon Sep 17 00:00:00 2001
> +From: Changqing Li <changqing.li@windriver.com>
> +Date: Sat, 29 Jan 2022 13:25:54 +0800
> +Subject: [PATCH] qemu: Add missing lock in qemuProcessHandleMonitorEOF
> +
> +qemuMonitorUnregister will be called in multiple threads (e.g. threads
> +in rpc worker pool and the vm event thread).  In some cases, it isn't
> +protected by the monitor lock, which may lead to call g_source_unref
> +more than one time and a use-after-free problem eventually.
> +
> +Add the missing lock in qemuProcessHandleMonitorEOF (which is the only
> +position missing lock of monitor I found).
> +
> +Suggested-by: Michal Privoznik <mprivozn@redhat.com>
> +Signed-off-by: Peng Liang <liangpeng10@huawei.com>
> +Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
> +Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
> +
> +Upstream-Status: Backport [https://github.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7]
> +CVE: CVE-2021-3975
> +
> +Signed-off-by: Changqing Li <changqing.li@windriver.com>
> +---
> + src/qemu/qemu_process.c | 2 ++
> + 1 file changed, 2 insertions(+)
> +
> +diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> +index 8ea470f..64b8472 100644
> +--- a/src/qemu/qemu_process.c
> ++++ b/src/qemu/qemu_process.c
> +@@ -315,7 +315,9 @@ qemuProcessHandleMonitorEOF(qemuMonitorPtr mon,
> +     /* We don't want this EOF handler to be called over and over while the
> +      * thread is waiting for a job.
> +      */
> ++    virObjectLock(mon);
> +     qemuMonitorUnregister(mon);
> ++    virObjectUnlock(mon);
> + 
> +     /* We don't want any cleanup from EOF handler (or any other
> +      * thread) to enter qemu namespace. */
> +-- 
> +2.17.1
> +
> diff --git a/recipes-extended/libvirt/libvirt_6.3.0.bb b/recipes-extended/libvirt/libvirt_6.3.0.bb
> index 091296e..8e95ad6 100644
> --- a/recipes-extended/libvirt/libvirt_6.3.0.bb
> +++ b/recipes-extended/libvirt/libvirt_6.3.0.bb
> @@ -46,6 +46,7 @@ SRC_URI = "http://libvirt.org/sources/libvirt-${PV}.tar.xz;name=libvirt \
>             file://CVE-2020-25637_4.patch \
>             file://CVE-2021-3631.patch \
>             file://0001-storage_driver-Unlock-object-on-ACL-fail-in-storageP.patch \
> +           file://CVE-2021-3975.patch \
>            "
>  
>  SRC_URI[libvirt.md5sum] = "1bd4435f77924f5ec9928b538daf4a02"
> -- 
> 2.17.1
> 

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