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6 Commits

Author SHA1 Message Date
Laszlo Ersek e30991740d OvmfPkg/AcpiPlatformDxe: catch theoretical nullptr deref in Xen code 
RH covscan justifiedly reports a path through InstallXenTables() where
DsdtTable can technically remain NULL.

If this occurs in practice, then the guest and the VMM are out of sync on
the interface contract. Catch the situation with a code snippet that halts
in RELEASE builds, and in DEBUG builds lets the platform DSC control the
assert disposition first (i.e. CPU exception, deadloop, or nothing).

> Error: CLANG_WARNING:
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:309:14: warning: Access
> to field 'Length' results in a dereference of a null pointer (loaded
> from variable 'DsdtTable')
> #             DsdtTable->Length,
> #             ^~~~~~~~~
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:154:3: note: Null
> pointer value stored to 'DsdtTable'
> #  DsdtTable   = NULL;
> #  ^~~~~~~~~~~~~~~~~~
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:162:3: note: Taking
> false branch
> #  if (EFI_ERROR (Status)) {
> #  ^
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:170:7: note: Assuming
> the condition is false
> #  if (XenAcpiRsdpStructurePtr->XsdtAddress) {
> #      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:170:3: note: Taking
> false branch
> #  if (XenAcpiRsdpStructurePtr->XsdtAddress) {
> #  ^
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:220:12: note: Assuming
> the condition is false
> #  else if (XenAcpiRsdpStructurePtr->RsdtAddress) {
> #           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:220:8: note: Taking
> false branch
> #  else if (XenAcpiRsdpStructurePtr->RsdtAddress) {
> #       ^
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:274:3: note: Taking
> false branch
> #  if (Fadt2Table) {
> #  ^
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:288:8: note: Taking
> false branch
> #  else if (Fadt1Table) {
> #       ^
> edk2-89910a39dcfd/OvmfPkg/AcpiPlatformDxe/Xen.c:309:14: note: Access to
> field 'Length' results in a dereference of a null pointer (loaded from
> variable 'DsdtTable')
> #             DsdtTable->Length,
> #             ^~~~~~~~~
> #  307|                AcpiProtocol,
> #  308|                DsdtTable,
> #  309|->              DsdtTable->Length,
> #  310|                &TableHandle
> #  311|                );

Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Julien Grall <julien.grall@arm.com>
Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=1710
Issue: scan-0993.txt
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
 2019-04-18 16:05:24 +02:00
Michael D Kinney b26f0cf9ee OvmfPkg: Replace BSD License with BSD+Patent License 
https://bugzilla.tianocore.org/show_bug.cgi?id=1373

Replace BSD 2-Clause License with BSD+Patent License.  This change is
based on the following emails:

  https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html
  https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html

RFCs with detailed process for the license change:

  V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html
  V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html
  V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
 2019-04-09 10:58:19 -07:00
jljusten 26af9aca92 OvmfPkg/AcpiPlatformDxe: Fix Visual Studio build issues 
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13602 6f19259b-4bc3-4df7-8a09-765794883524
 2012-08-09 23:27:05 +00:00
jljusten 4804ef4943 OvmfPkg/AcpiPlatformDxe/Xen.c: reuse CalculateSum8 
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13542 6f19259b-4bc3-4df7-8a09-765794883524
 2012-07-18 22:33:48 +00:00
jljusten 377e758c3f OvmfPkg/AcpiPlatformDxe: Add Xen ACPI tables support 
This patch adds Xen ACPI tables support to OVMF.
Use EFI_ACPI_TABLE_PROTOCOL to publish all Xen ACPI tables in OVMF,
while keeping the Qemu and KVM support.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Bei Guan <gbtju85@gmail.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13541 6f19259b-4bc3-4df7-8a09-765794883524
 2012-07-18 22:33:33 +00:00
jljusten 522203de37 OvmfPkg/AcpiPlatformDxe: Detect QEMU & Xen 
Detect QEMU & Xen, and allow each to choose how to publish
the individual ACPI tables.

Currently both paths simply publish the tables unmodified.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13385 6f19259b-4bc3-4df7-8a09-765794883524
 2012-05-30 23:15:27 +00:00