diff --git a/0022-lib-Disable-5-level-page-tables-when-using-cpu-max.patch b/0022-lib-Disable-5-level-page-tables-when-using-cpu-max.patch new file mode 100644 index 0000000..7fe284e --- /dev/null +++ b/0022-lib-Disable-5-level-page-tables-when-using-cpu-max.patch @@ -0,0 +1,92 @@ +From bb19cc0cdd43619ccf830e1e608f79e46f8ddf86 Mon Sep 17 00:00:00 2001 +From: "Richard W.M. Jones" +Date: Thu, 12 May 2022 08:36:37 +0100 +Subject: [PATCH] lib: Disable 5-level page tables when using -cpu max + +In https://bugzilla.redhat.com/show_bug.cgi?id=2082806 we've been +tracking an insidious qemu bug which intermittently prevents the +libguestfs appliance from starting. The symptoms are that SeaBIOS +starts and displays its messages, but the kernel isn't reached. We +found that the kernel does in fact start, but when it tries to set up +page tables and jump to protected mode it gets a triple fault which +causes the emulated CPU in qemu to reset (qemu exits). + +This seems to only affect TCG (not KVM). + +Yesterday I found that this is caused by using -cpu max which enables +the "la57" feature (5-level page tables[0]), and that we can make the +problem go away using -cpu max,la57=off. Note that I still don't +fully understand the qemu bug, so this is only a workaround. + +I chose to disable 5-level page tables for both TCG and KVM, partly to +make the patch simpler, and partly because I guess it's not a feature +(ie. 57 bit linear addresses) that is useful for the libguestfs +appliance case, where we have limited physical memory and no need to +run any programs with huge address spaces. + +I tested this by running both the direct & libvirt paths overnight. I +expect that this patch will fail with old qemu/libvirt which doesn't +understand the "la57" feature, but this is only intended as a +temporary workaround. + +[0] Article about 5-level page tables as background: +https://lwn.net/Articles/717293/ + +Thanks: Laszlo Ersek +Fixes: https://answers.launchpad.net/ubuntu/+source/libguestfs/+question/701625 + +[RHEL 8.7: Patch is not upstream. This is the initial patch as posted +to the mailing list here: +https://listman.redhat.com/archives/libguestfs/2022-May/028853.html] +--- + lib/launch-direct.c | 15 +++++++++++++-- + lib/launch-libvirt.c | 7 +++++++ + 2 files changed, 20 insertions(+), 2 deletions(-) + +diff --git a/lib/launch-direct.c b/lib/launch-direct.c +index de17d2167..6b28e4724 100644 +--- a/lib/launch-direct.c ++++ b/lib/launch-direct.c +@@ -534,8 +534,19 @@ launch_direct (guestfs_h *g, void *datav, const char *arg) + } end_list (); + + cpu_model = guestfs_int_get_cpu_model (has_kvm && !force_tcg); +- if (cpu_model) +- arg ("-cpu", cpu_model); ++ if (cpu_model) { ++#if defined(__x86_64__) ++ /* Temporary workaround for RHBZ#2082806 */ ++ if (STREQ (cpu_model, "max")) { ++ start_list ("-cpu") { ++ append_list (cpu_model); ++ append_list ("la57=off"); ++ } end_list (); ++ } ++ else ++#endif ++ arg ("-cpu", cpu_model); ++ } + + if (g->smp > 1) + arg_format ("-smp", "%d", g->smp); +diff --git a/lib/launch-libvirt.c b/lib/launch-libvirt.c +index db619910f..bad4a54ea 100644 +--- a/lib/launch-libvirt.c ++++ b/lib/launch-libvirt.c +@@ -1172,6 +1172,13 @@ construct_libvirt_xml_cpu (guestfs_h *g, + else if (STREQ (cpu_model, "max")) { + /* https://bugzilla.redhat.com/show_bug.cgi?id=1935572#c11 */ + attribute ("mode", "maximum"); ++#if defined(__x86_64__) ++ /* Temporary workaround for RHBZ#2082806 */ ++ start_element ("feature") { ++ attribute ("policy", "disable"); ++ attribute ("name", "la57"); ++ } end_element (); ++#endif + } + else + single_element ("model", cpu_model); +-- +2.31.1 + diff --git a/0023-docs-guestfs-security-document-CVE-2022-2211.patch b/0023-docs-guestfs-security-document-CVE-2022-2211.patch new file mode 100644 index 0000000..6d74edc --- /dev/null +++ b/0023-docs-guestfs-security-document-CVE-2022-2211.patch @@ -0,0 +1,103 @@ +From 22d779d5982dc82d629710d41973ed6545707bd9 Mon Sep 17 00:00:00 2001 +From: Laszlo Ersek +Date: Tue, 28 Jun 2022 13:54:16 +0200 +Subject: [PATCH] docs/guestfs-security: document CVE-2022-2211 + +Short log for the common submodule, commit range +f8de5508fe75..35467027f657: + +Laszlo Ersek (2): + mlcustomize: factor out pkg install/update/uninstall from guestfs-tools + options: fix buffer overflow in get_keys() [CVE-2022-2211] + +Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1809453 +Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2100862 +Signed-off-by: Laszlo Ersek +Message-Id: <20220628115418.5376-2-lersek@redhat.com> +Reviewed-by: Richard W.M. Jones + +Cherry picked from commit 99844660b48ed809e37378262c65d63df6ce4a53. +For the cherry pick I only added one submodule commit: + +options: fix buffer overflow in get_keys() [CVE-2022-2211] +--- + common | 2 +- + docs/guestfs-security.pod | 28 ++++++++++++++++++++++++++++ + 2 files changed, 29 insertions(+), 1 deletion(-) + +Submodule common be09523d6..1174b443a: +diff --git a/common/options/keys.c b/common/options/keys.c +index 798315c..d27a712 100644 +--- a/common/options/keys.c ++++ b/common/options/keys.c +@@ -128,17 +128,23 @@ read_first_line_from_file (const char *filename) + char ** + get_keys (struct key_store *ks, const char *device, const char *uuid) + { +- size_t i, j, len; ++ size_t i, j, nmemb; + char **r; + char *s; + + /* We know the returned list must have at least one element and not + * more than ks->nr_keys. + */ +- len = 1; +- if (ks) +- len = MIN (1, ks->nr_keys); +- r = calloc (len+1, sizeof (char *)); ++ nmemb = 1; ++ if (ks && ks->nr_keys > nmemb) ++ nmemb = ks->nr_keys; ++ ++ /* make room for the terminating NULL */ ++ if (nmemb == (size_t)-1) ++ error (EXIT_FAILURE, 0, _("size_t overflow")); ++ nmemb++; ++ ++ r = calloc (nmemb, sizeof (char *)); + if (r == NULL) + error (EXIT_FAILURE, errno, "calloc"); + +diff --git a/docs/guestfs-security.pod b/docs/guestfs-security.pod +index 9ceef5623..efa35b29d 100644 +--- a/docs/guestfs-security.pod ++++ b/docs/guestfs-security.pod +@@ -406,6 +406,34 @@ The libvirt backend is not affected. + The solution is to update qemu to a version containing the fix (see + L). + ++=head2 CVE-2022-2211 ++ ++L ++ ++The C function in F collects ++those I<--key> options from the command line into a new array that match ++a particular block device that's being decrypted for inspection. The ++function intends to size the result array such that potentially all ++I<--key> options, plus a terminating C element, fit into it. The ++code mistakenly uses the C macro instead of C, and therefore ++only one element is allocated before the C terminator. ++ ++Passing precisely two I<--key ID:...> options on the command line for ++the encrypted block device C causes C to overwrite the ++terminating C, leading to an out-of-bounds read in ++C, file F. ++ ++Passing more than two I<--key ID:...> options on the command line for ++the encrypted block device C causes C itself to perform ++out-of-bounds writes. The most common symptom is a crash with C ++later on. ++ ++This issue affects -- broadly speaking -- all libguestfs-based utilities ++that accept I<--key>, namely: C, C, C, ++C, C, C, C, ++C, C, C, C, ++C, C, C. ++ + =head1 SEE ALSO + + L, +-- +2.31.1 + diff --git a/libguestfs.spec b/libguestfs.spec index 6743f22..80413eb 100644 --- a/libguestfs.spec +++ b/libguestfs.spec @@ -32,7 +32,7 @@ Summary: Access and modify virtual machine disk images Name: libguestfs Epoch: 1 Version: 1.44.0 -Release: 6%{?dist} +Release: 9%{?dist} License: LGPLv2+ ExclusiveArch: x86_64 %{power64} aarch64 s390x @@ -71,6 +71,8 @@ Patch0018: 0018-lib-extract-NETWORK_ADDRESS-and-NETWORK_PREFIX-as-ma.patch Patch0019: 0019-launch-libvirt-add-virtio-net-via-the-standard-inter.patch Patch0020: 0020-appliance-Use-cpu-max.patch Patch0021: 0021-appliance-Use-cpu-mode-maximum-for-cpu-max-on-libvir.patch +Patch0022: 0022-lib-Disable-5-level-page-tables-when-using-cpu-max.patch +Patch0023: 0023-docs-guestfs-security-document-CVE-2022-2211.patch # Replacement README file. Source4: README-replacement.in @@ -230,7 +232,7 @@ BuildRequires: iputils %if !0%{?rhel} BuildRequires: jfsutils %endif -BuildRequires: kernel +BuildRequires: (kernel without kernel-debug-core) BuildRequires: kmod BuildRequires: kpartx BuildRequires: less @@ -300,6 +302,12 @@ BuildRequires: zfs-fuse # to replace it with (eg) a fixed appliance. Requires: (%{name}-appliance = %{epoch}:%{version}-%{release} or %{name}-noappliance) +# libguestfs-benchmarking was accidentally present in RHEL AV 8.5 and +# removed in RHEL 8.6+. Add an Obsoletes to smooth the upgrade path +# for anyone who had this package installed. +# https://bugzilla.redhat.com/show_bug.cgi?id=2091597 +Obsoletes: %{name}-benchmarking < %{epoch}:%{version}-%{release} + # The daemon dependencies are not included automatically, because it # is buried inside the appliance, so list them here. Requires: augeas-libs%{?_isa} @@ -1186,6 +1194,19 @@ rm ocaml/html/.gitignore %changelog +* Tue Jul 05 2022 Richard W.M. Jones - 1:1.44.0-9 +- Fix CVE-2022-2211 Denial of Service in --key parameter + resolves: rhbz#2101280 + +* Tue Jun 07 2022 Richard W.M. Jones - 1:1.44.0-8 +- Obsolete old libguestfs-benchmarking subpackage + resolves: rhbz#2091597 + +* Thu May 12 2022 Richard W.M. Jones - 1:1.44.0-7 +- Disable 5-level page tables when using -cpu max + resolves: rhbz#2084566 + related: rhbz#2075424 + * Thu Apr 14 2022 Richard W.M. Jones - 1:1.44.0-6 - Backport support for -cpu max to allow RHEL 9 guests to be modified resolves: rhbz#2075424 diff --git a/sources b/sources index 5feb606..9e2dc63 100644 --- a/sources +++ b/sources @@ -1,2 +1,2 @@ -SHA512 (libguestfs-1.44.0.tar.gz) = e5052d6deb130f9bceea06d2d6626162991cb83ffaf0ed9923ff5d8bb67137e565053104d8854d37ea8c871dce2a5ca29507d17357de813a8ac49896f00be103 -SHA512 (libguestfs.keyring) = 297a15edc7c220222b9f650e0a9361ae132d3f0fed04aeb2237a1d9c3f6dac6f336846434f66480faed72635a33f659e849b052e74b88d1508aeff03f8c9a2ac +SHA1 (libguestfs-1.44.0.tar.gz) = 99d241dc4a5ba0dc6111954ed7a872e0b0bb6944 +SHA1 (libguestfs.keyring) = 1bbc40f501a7fef9eef2a39b701a71aee2fea7c4