Only disable the PCI-specific driver probe, since we do still want fallback
to fbdev to work. Resolves: #2029769
This commit is contained in:
Adam Jackson
parent
7f4f9d8e78
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631c5917b6
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@ -0,0 +1,83 @@
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From b3afd9ccefe156ab2dee993118fcdba40341f66e Mon Sep 17 00:00:00 2001
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From: Adam Jackson <ajax@redhat.com>
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Date: Fri, 1 Oct 2021 11:47:21 -0400
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Subject: [PATCH xserver] mustard: xfree86: Disable the PCI probe path
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RHEL 9 does not support userspace modesetting drivers for Xorg. Ideally
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it would only support DRM drivers, but there are some fallback paths
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(efifb mainly) that still require fbdev support. Since the primary use
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of the PCI probe path is devices _without_ kernel support, we can safely
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disable it. And indeed we want to, because there are some devices
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(hyperv v1 e.g.) with both a platform and a PCI presentation, which the
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PCI probe code fails to handle such that the server fails to start.
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Thus: we #if 0 out the PCI probe in xf86CallDriverProbe.
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It might be nice if the platform code knew about fbdev devices, but it
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does not, and teaching it would be a large change for little benefit
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given we do intend to sunset the fbdev path as well. Since the fbdev
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path exists solely for cases where we have only the rudimentary firmare
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framebuffer, we should only use it if _no_ platform driver is available.
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Thus: we only call the legacy probe method if xf86ProbeIgnorePrimary.
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Having done this, we need to go back into fbdevhw and undo fc78bcca:
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commit fc78bcca21e767697de6ad4d8e03b6728856f613 (merge-requests/38)
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Author: Adam Jackson <ajax@redhat.com>
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Date: Wed Oct 10 14:09:11 2018 -0400
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fbdevhw: Refuse to touch PCI devices on the fallback probe path
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Which was well intentioned, but given the above changes we know by the
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time we're trying to probe fbdev we really do want it, either because of
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the above fallback path or because xorg.conf asked for it. In either
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case we shouldn't spuriously fail just because it happens to be PCI.
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Thus: We if (0) out the code added in fc78bcca.
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Any one of the above might be questionable upstream, hence the mustard
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nature of this patch.
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---
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hw/xfree86/common/xf86Bus.c | 4 ++--
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hw/xfree86/fbdevhw/fbdevhw.c | 2 +-
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2 files changed, 3 insertions(+), 3 deletions(-)
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diff --git a/hw/xfree86/common/xf86Bus.c b/hw/xfree86/common/xf86Bus.c
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index fd144dbe7a..844ce5a890 100644
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--- a/hw/xfree86/common/xf86Bus.c
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+++ b/hw/xfree86/common/xf86Bus.c
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@@ -84,7 +84,7 @@ xf86CallDriverProbe(DriverPtr drv, Bool detect_only)
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}
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#endif
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-#ifdef XSERVER_LIBPCIACCESS
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+#if 0
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if (!foundScreen && (drv->PciProbe != NULL)) {
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if (xf86DoConfigure && xf86DoConfigurePass1) {
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assert(detect_only);
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@@ -96,7 +96,7 @@ xf86CallDriverProbe(DriverPtr drv, Bool detect_only)
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}
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}
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#endif
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- if (!foundScreen && (drv->Probe != NULL)) {
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+ if (!foundScreen && xf86ProbeIgnorePrimary && (drv->Probe != NULL)) {
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xf86Msg(X_WARNING, "Falling back to old probe method for %s\n",
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drv->driverName);
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foundScreen = (*drv->Probe) (drv, (detect_only) ? PROBE_DETECT
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diff --git a/hw/xfree86/fbdevhw/fbdevhw.c b/hw/xfree86/fbdevhw/fbdevhw.c
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index 3d8b92e669..171038f46d 100644
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--- a/hw/xfree86/fbdevhw/fbdevhw.c
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+++ b/hw/xfree86/fbdevhw/fbdevhw.c
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@@ -330,7 +330,7 @@ fbdev_open(int scrnIndex, const char *dev, char **namep)
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}
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/* only touch non-PCI devices on this path */
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- {
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+ if (0) {
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char buf[PATH_MAX];
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char *sysfs_path = NULL;
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char *node = strrchr(dev, '/') + 1;
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--
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2.31.1
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@ -1,43 +0,0 @@
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From ab756b13392448201c106b7629c55f68af4d8ec5 Mon Sep 17 00:00:00 2001
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From: Adam Jackson <ajax@redhat.com>
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Date: Fri, 1 Oct 2021 11:47:21 -0400
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Subject: [PATCH xserver] mustard: xfree86: Only call the driver's
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platformProbe
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The code to detangle what's a PCI device and what's platform is... bad.
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The PCI-specific initialization path should never be necessary these
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days, and the ancient "just probe something" path should especially
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never be necessary, so we can avoid a bunch of fragile code by simply
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never calling into the non-platform probe paths and letting platform
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handle everything.
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Among other things this fixes hypervdrm on v1 devices, which have both a
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PCI and a platform presentation, in a way that would cause X to fail to
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start.
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---
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hw/xfree86/common/xf86Bus.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/hw/xfree86/common/xf86Bus.c b/hw/xfree86/common/xf86Bus.c
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index fd144dbe7a..88e07dec40 100644
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--- a/hw/xfree86/common/xf86Bus.c
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+++ b/hw/xfree86/common/xf86Bus.c
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@@ -84,6 +84,7 @@ xf86CallDriverProbe(DriverPtr drv, Bool detect_only)
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}
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#endif
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+#if 0
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#ifdef XSERVER_LIBPCIACCESS
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if (!foundScreen && (drv->PciProbe != NULL)) {
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if (xf86DoConfigure && xf86DoConfigurePass1) {
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@@ -102,6 +103,7 @@ xf86CallDriverProbe(DriverPtr drv, Bool detect_only)
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foundScreen = (*drv->Probe) (drv, (detect_only) ? PROBE_DETECT
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: PROBE_DEFAULT);
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}
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+#endif
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return foundScreen;
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}
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--
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2.31.1
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@ -42,7 +42,7 @@
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Summary: X.Org X11 X server
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Name: xorg-x11-server
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Version: 1.20.11
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Release: 7%{?gitdate:.%{gitdate}}%{?dist}
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Release: 8%{?gitdate:.%{gitdate}}%{?dist}
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URL: http://www.x.org
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License: MIT
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@ -92,8 +92,8 @@ Patch6: 0001-Fedora-hack-Make-the-suid-root-wrapper-always-start-.patch
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Patch7: 0001-xkb-Drop-check-for-XkbSetMapResizeTypes.patch
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# 1988922 - [Hyper-V]Installation failed with: 'x or window manager startup failed' when the VM was created with GEN1
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Patch8: 0001-mustard-xfree86-Only-call-the-driver-s-platformProbe.patch
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# 2029769 - fbdev Xorg driver no longer works as a fallback with unsupported hardware
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Patch8: 0001-mustard-xfree86-Disable-the-PCI-probe-path.patch
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# Backports from current stable "server-1.20-branch":
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# <empty>
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@ -529,6 +529,11 @@ find %{inst_srcdir}/hw/xfree86 -name \*.c -delete
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%changelog
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* Wed Jan 26 2022 Adam Jackson <ajax@redhat.com> - 1.20.11-8
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- Only disable the PCI-specific driver probe, since we do still want fallback
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to fbdev to work.
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Resolves: #2029769
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* Thu Jan 6 2022 Olivier Fourdan <ofourdan@redhat.com> - 1.20.11-7
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- CVE fix for: CVE-2021-4008 (#2030160), CVE-2021-4009 (#2030170),
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CVE-2021-4010 (#2030174), CVE-2021-4011 (#2030179)
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