import libguestfs-1.44.0-9.module+el8.7.0+16689+53d59bc2
CentOS Sources
11 months ago
committed by
Stepan Oksanichenko
parent
55b111a4aa
commit
f8538d2090
@ -0,0 +1,86 @@
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From fbb053fc71c0c072acb3fbf6e5fbbfc3b0667fd2 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Thu, 28 Jan 2021 12:20:49 +0000
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Subject: [PATCH] appliance: Use -cpu max.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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QEMU has a newish feature (from about 2017 / qemu 2.9) called -cpu max
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which is supposed to select the best CPU, ideal for libguestfs.
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After this change, on x86-64:
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KVM TCG
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Direct -cpu max -cpu max
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(non-libvirt)
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Libvirt <cpu mode="host-passthrough"> <cpu mode="host-model">
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<model fallback="allow"/> <model fallback="allow"/>
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</cpu> </cpu>
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Thanks: Daniel Berrangé
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(cherry picked from commit 30f74f38bd6e42e783ba80895f4d6826abddd417)
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---
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lib/appliance-cpu.c | 16 ++++++++--------
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lib/launch-libvirt.c | 9 +++++++++
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2 files changed, 17 insertions(+), 8 deletions(-)
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diff --git a/lib/appliance-cpu.c b/lib/appliance-cpu.c
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index 5ef9f5c72..54ac6e2e3 100644
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--- a/lib/appliance-cpu.c
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+++ b/lib/appliance-cpu.c
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@@ -38,6 +38,11 @@
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*
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* The literal string C<"host"> means use C<-cpu host>.
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*
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+ * =item C<"max">
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+ *
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+ * The literal string C<"max"> means use C<-cpu max> (the best
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+ * possible). This requires awkward translation for libvirt.
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+ *
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* =item some string
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*
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* Some string such as C<"cortex-a57"> means use C<-cpu cortex-a57>.
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@@ -80,14 +85,9 @@ guestfs_int_get_cpu_model (int kvm)
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/* See discussion in https://bugzilla.redhat.com/show_bug.cgi?id=1605071 */
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return NULL;
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#else
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- /* On most architectures, it is faster to pass the CPU host model to
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- * the appliance, allowing maximum speed for things like checksums
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- * and encryption. Only do this with KVM. It is broken in subtle
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- * ways on TCG, and fairly pointless when you're emulating anyway.
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+ /* On most architectures we can use "max" to get the best possible CPU.
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+ * For recent qemu this should work even on TCG.
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*/
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- if (kvm)
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- return "host";
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- else
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- return NULL;
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+ return "max";
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#endif
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}
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diff --git a/lib/launch-libvirt.c b/lib/launch-libvirt.c
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index f6bb39d99..e3ff1ffe0 100644
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--- a/lib/launch-libvirt.c
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+++ b/lib/launch-libvirt.c
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@@ -1169,6 +1169,15 @@ construct_libvirt_xml_cpu (guestfs_h *g,
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attribute ("fallback", "allow");
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} end_element ();
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}
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+ else if (STREQ (cpu_model, "max")) {
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+ if (params->data->is_kvm)
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+ attribute ("mode", "host-passthrough");
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+ else
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+ attribute ("mode", "host-model");
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+ start_element ("model") {
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+ attribute ("fallback", "allow");
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+ } end_element ();
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+ }
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else
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single_element ("model", cpu_model);
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} end_element ();
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--
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2.31.1
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@ -0,0 +1,48 @@
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From 7dde1007525ec235e769351be15ca5de34eeda4a Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Thu, 18 Mar 2021 12:32:26 +0000
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Subject: [PATCH] appliance: Use <cpu mode="maximum"/> for -cpu max on libvirt.
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Note this requires libvirt >= 7.1.0 which was only released in March 2021.
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With an older libvirt you will see this error:
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Original error from libvirt: unsupported configuration: Invalid mode attribute 'maximum' [code=67 int1=-1]
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In theory we could check if this is supported by looking at the
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libvirt capabilities and fall back, but this commit does not do that,
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in the expectation that most people will be using the default backend
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(direct) and on Fedora/RHEL we will add an explicit minimum version
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dependency to the package.
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qemu support has been around quite a bit longer (at least since 2017).
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Fixes: commit 30f74f38bd6e42e783ba80895f4d6826abddd417
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(cherry picked from commit 13ceb6a87b2869909a6a0e3c8caa962b72e4cb0e)
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---
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lib/launch-libvirt.c | 9 ++-------
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1 file changed, 2 insertions(+), 7 deletions(-)
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diff --git a/lib/launch-libvirt.c b/lib/launch-libvirt.c
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index e3ff1ffe0..db619910f 100644
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--- a/lib/launch-libvirt.c
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+++ b/lib/launch-libvirt.c
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@@ -1170,13 +1170,8 @@ construct_libvirt_xml_cpu (guestfs_h *g,
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} end_element ();
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}
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else if (STREQ (cpu_model, "max")) {
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- if (params->data->is_kvm)
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- attribute ("mode", "host-passthrough");
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- else
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- attribute ("mode", "host-model");
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- start_element ("model") {
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- attribute ("fallback", "allow");
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- } end_element ();
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+ /* https://bugzilla.redhat.com/show_bug.cgi?id=1935572#c11 */
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+ attribute ("mode", "maximum");
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}
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else
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single_element ("model", cpu_model);
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--
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2.31.1
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@ -0,0 +1,92 @@
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From bb19cc0cdd43619ccf830e1e608f79e46f8ddf86 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Thu, 12 May 2022 08:36:37 +0100
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Subject: [PATCH] lib: Disable 5-level page tables when using -cpu max
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In https://bugzilla.redhat.com/show_bug.cgi?id=2082806 we've been
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tracking an insidious qemu bug which intermittently prevents the
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libguestfs appliance from starting. The symptoms are that SeaBIOS
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starts and displays its messages, but the kernel isn't reached. We
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found that the kernel does in fact start, but when it tries to set up
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page tables and jump to protected mode it gets a triple fault which
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causes the emulated CPU in qemu to reset (qemu exits).
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This seems to only affect TCG (not KVM).
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Yesterday I found that this is caused by using -cpu max which enables
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the "la57" feature (5-level page tables[0]), and that we can make the
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problem go away using -cpu max,la57=off. Note that I still don't
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fully understand the qemu bug, so this is only a workaround.
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I chose to disable 5-level page tables for both TCG and KVM, partly to
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make the patch simpler, and partly because I guess it's not a feature
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(ie. 57 bit linear addresses) that is useful for the libguestfs
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appliance case, where we have limited physical memory and no need to
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run any programs with huge address spaces.
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I tested this by running both the direct & libvirt paths overnight. I
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expect that this patch will fail with old qemu/libvirt which doesn't
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understand the "la57" feature, but this is only intended as a
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temporary workaround.
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[0] Article about 5-level page tables as background:
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https://lwn.net/Articles/717293/
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Thanks: Laszlo Ersek
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Fixes: https://answers.launchpad.net/ubuntu/+source/libguestfs/+question/701625
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[RHEL 8.7: Patch is not upstream. This is the initial patch as posted
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to the mailing list here:
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https://listman.redhat.com/archives/libguestfs/2022-May/028853.html]
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---
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lib/launch-direct.c | 15 +++++++++++++--
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lib/launch-libvirt.c | 7 +++++++
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2 files changed, 20 insertions(+), 2 deletions(-)
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diff --git a/lib/launch-direct.c b/lib/launch-direct.c
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index de17d2167..6b28e4724 100644
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--- a/lib/launch-direct.c
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+++ b/lib/launch-direct.c
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@@ -534,8 +534,19 @@ launch_direct (guestfs_h *g, void *datav, const char *arg)
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} end_list ();
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cpu_model = guestfs_int_get_cpu_model (has_kvm && !force_tcg);
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- if (cpu_model)
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- arg ("-cpu", cpu_model);
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+ if (cpu_model) {
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+#if defined(__x86_64__)
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+ /* Temporary workaround for RHBZ#2082806 */
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+ if (STREQ (cpu_model, "max")) {
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+ start_list ("-cpu") {
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+ append_list (cpu_model);
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+ append_list ("la57=off");
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+ } end_list ();
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+ }
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+ else
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+#endif
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+ arg ("-cpu", cpu_model);
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+ }
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if (g->smp > 1)
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arg_format ("-smp", "%d", g->smp);
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diff --git a/lib/launch-libvirt.c b/lib/launch-libvirt.c
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index db619910f..bad4a54ea 100644
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--- a/lib/launch-libvirt.c
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+++ b/lib/launch-libvirt.c
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@@ -1172,6 +1172,13 @@ construct_libvirt_xml_cpu (guestfs_h *g,
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else if (STREQ (cpu_model, "max")) {
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/* https://bugzilla.redhat.com/show_bug.cgi?id=1935572#c11 */
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attribute ("mode", "maximum");
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+#if defined(__x86_64__)
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+ /* Temporary workaround for RHBZ#2082806 */
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+ start_element ("feature") {
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+ attribute ("policy", "disable");
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+ attribute ("name", "la57");
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+ } end_element ();
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+#endif
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}
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else
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single_element ("model", cpu_model);
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--
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2.31.1
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@ -0,0 +1,103 @@
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From 22d779d5982dc82d629710d41973ed6545707bd9 Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Tue, 28 Jun 2022 13:54:16 +0200
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Subject: [PATCH] docs/guestfs-security: document CVE-2022-2211
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Short log for the common submodule, commit range
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f8de5508fe75..35467027f657:
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Laszlo Ersek (2):
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mlcustomize: factor out pkg install/update/uninstall from guestfs-tools
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options: fix buffer overflow in get_keys() [CVE-2022-2211]
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1809453
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2100862
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Message-Id: <20220628115418.5376-2-lersek@redhat.com>
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Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
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Cherry picked from commit 99844660b48ed809e37378262c65d63df6ce4a53.
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For the cherry pick I only added one submodule commit:
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options: fix buffer overflow in get_keys() [CVE-2022-2211]
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---
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common | 2 +-
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docs/guestfs-security.pod | 28 ++++++++++++++++++++++++++++
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2 files changed, 29 insertions(+), 1 deletion(-)
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Submodule common be09523d6..1174b443a:
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diff --git a/common/options/keys.c b/common/options/keys.c
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index 798315c..d27a712 100644
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--- a/common/options/keys.c
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+++ b/common/options/keys.c
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@@ -128,17 +128,23 @@ read_first_line_from_file (const char *filename)
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char **
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get_keys (struct key_store *ks, const char *device, const char *uuid)
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{
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- size_t i, j, len;
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+ size_t i, j, nmemb;
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char **r;
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char *s;
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/* We know the returned list must have at least one element and not
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* more than ks->nr_keys.
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*/
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- len = 1;
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- if (ks)
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- len = MIN (1, ks->nr_keys);
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- r = calloc (len+1, sizeof (char *));
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+ nmemb = 1;
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+ if (ks && ks->nr_keys > nmemb)
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+ nmemb = ks->nr_keys;
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+
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+ /* make room for the terminating NULL */
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+ if (nmemb == (size_t)-1)
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+ error (EXIT_FAILURE, 0, _("size_t overflow"));
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+ nmemb++;
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+
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+ r = calloc (nmemb, sizeof (char *));
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if (r == NULL)
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error (EXIT_FAILURE, errno, "calloc");
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diff --git a/docs/guestfs-security.pod b/docs/guestfs-security.pod
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index 9ceef5623..efa35b29d 100644
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--- a/docs/guestfs-security.pod
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+++ b/docs/guestfs-security.pod
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@@ -406,6 +406,34 @@ The libvirt backend is not affected.
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The solution is to update qemu to a version containing the fix (see
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L<https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg01012.html>).
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+=head2 CVE-2022-2211
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+
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+L<https://bugzilla.redhat.com/CVE-2022-2211>
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+
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+The C<get_keys> function in F<libguestfs-common/options/keys.c> collects
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+those I<--key> options from the command line into a new array that match
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+a particular block device that's being decrypted for inspection. The
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+function intends to size the result array such that potentially all
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+I<--key> options, plus a terminating C<NULL> element, fit into it. The
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+code mistakenly uses the C<MIN> macro instead of C<MAX>, and therefore
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+only one element is allocated before the C<NULL> terminator.
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+
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+Passing precisely two I<--key ID:...> options on the command line for
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+the encrypted block device C<ID> causes C<get_keys> to overwrite the
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+terminating C<NULL>, leading to an out-of-bounds read in
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+C<decrypt_mountables>, file F<libguestfs-common/options/decrypt.c>.
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+
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+Passing more than two I<--key ID:...> options on the command line for
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+the encrypted block device C<ID> causes C<get_keys> itself to perform
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+out-of-bounds writes. The most common symptom is a crash with C<SIGSEGV>
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+later on.
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+
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+This issue affects -- broadly speaking -- all libguestfs-based utilities
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+that accept I<--key>, namely: C<guestfish>, C<guestmount>, C<virt-cat>,
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+C<virt-customize>, C<virt-diff>, C<virt-edit>, C<virt-get-kernel>,
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+C<virt-inspector>, C<virt-log>, C<virt-ls>, C<virt-sparsify>,
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+C<virt-sysprep>, C<virt-tail>, C<virt-v2v>.
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+
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=head1 SEE ALSO
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L<guestfs(3)>,
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--
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2.31.1
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Loading…
Reference in New Issue