1 files changed, 64 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2018-15746.patch b/meta/recipes-devtools/qemu/qemu/CVE-2018-15746.patch
new file mode 100644
index 0000000000..2f61ea0051
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2018-15746.patch
@@ -0,0 +1,64 @@
+From 9acf4c64dd4560bd268006d7356c7455fab7e5b1 Mon Sep 17 00:00:00 2001
+From: Changqing Li <changqing.li@windriver.com>
+Date: Thu, 6 Sep 2018 14:52:12 +0800
+Subject: [PATCH] seccomp: set the seccomp filter to all threads
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+When using "-seccomp on", the seccomp policy is only applied to the
+main thread, the vcpu worker thread and other worker threads created
+after seccomp policy is applied; the seccomp policy is not applied to
+e.g. the RCU thread because it is created before the seccomp policy is
+applied and SECCOMP_FILTER_FLAG_TSYNC isn't used.
+
+This can be verified with
+for task in /proc/`pidof qemu`/task/*; do cat $task/status | grep Secc ; done
+Seccomp:        2
+Seccomp:        0
+Seccomp:        0
+Seccomp:        2
+Seccomp:        2
+Seccomp:        2
+
+Starting with libseccomp 2.2.0 and kernel >= 3.17, we can use
+seccomp_attr_set(ctx, > SCMP_FLTATR_CTL_TSYNC, 1) to update the policy
+on all threads.
+
+libseccomp requirement was bumped to 2.2.0 in previous patch.
+libseccomp should fail to set the filter if it can't honour
+SCMP_FLTATR_CTL_TSYNC (untested), and thus -sandbox will now fail on
+kernel < 3.17.
+
+Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
+Acked-by: Eduardo Otubo <otubo@redhat.com>
+
+Upstream-Status: Backport[https://github.com/qemu/qemu/commit/
+70dfabeaa79ba4d7a3b699abe1a047c8012db114#diff-18106d3b47a2d249f9d41e772b7db22d]
+
+CVE: CVE-2018-15746
+
+Signed-off-by: Changqing Li <changqing.li@windriver.com>
+---
+ qemu-seccomp.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/qemu-seccomp.c b/qemu-seccomp.c
+index 9cd8eb9..ba5500a 100644
+--- a/qemu-seccomp.c
++++ b/qemu-seccomp.c
+@@ -120,6 +120,11 @@ static int seccomp_start(uint32_t seccomp_opts)
+         goto seccomp_return;
+     }
+ 
++    rc = seccomp_attr_set(ctx, SCMP_FLTATR_CTL_TSYNC, 1);
++    if (rc != 0) {
++        goto seccomp_return;
++    }
++
+     for (i = 0; i < ARRAY_SIZE(blacklist); i++) {
+         if (!(seccomp_opts & blacklist[i].set)) {
+             continue;
+-- 
+2.7.4
+