OvmfPkg: PlatformPei: protect SEC's GUIDed section handler table thru S3

OVMF's SecMain is unique in the sense that it links against the following
two libraries *in combination*:

- IntelFrameworkModulePkg/Library/LzmaCustomDecompressLib/
                                               LzmaCustomDecompressLib.inf
- MdePkg/Library/BaseExtractGuidedSectionLib/
                                           BaseExtractGuidedSectionLib.inf

The ExtractGuidedSectionLib library class allows decompressor modules to
register themselves (keyed by GUID) with it, and it allows clients to
decompress file sections with a registered decompressor module that
matches the section's GUID.

BaseExtractGuidedSectionLib is a library instance (of type BASE) for this
library class. It has no constructor function.

LzmaCustomDecompressLib is a compatible decompressor module (of type
BASE). Its section type GUID is

  gLzmaCustomDecompressGuid == EE4E5898-3914-4259-9D6E-DC7BD79403CF

When OVMF's SecMain module starts, the LzmaCustomDecompressLib constructor
function is executed, which registers its LZMA decompressor with the above
GUID, by calling into BaseExtractGuidedSectionLib:

  LzmaDecompressLibConstructor() [GuidedSectionExtraction.c]
    ExtractGuidedSectionRegisterHandlers() [BaseExtractGuidedSectionLib.c]
      GetExtractGuidedSectionHandlerInfo()
        PcdGet64 (PcdGuidedExtractHandlerTableAddress) -- NOTE THIS

Later, during a normal (non-S3) boot, SecMain utilizes this decompressor
to get information about, and to decompress, sections of the OVMF firmware
image:

  SecCoreStartupWithStack() [OvmfPkg/Sec/SecMain.c]
    SecStartupPhase2()
      FindAndReportEntryPoints()
        FindPeiCoreImageBase()
          DecompressMemFvs()
            ExtractGuidedSectionGetInfo() [BaseExtractGuidedSectionLib.c]
            ExtractGuidedSectionDecode() [BaseExtractGuidedSectionLib.c]

Notably, only the extraction depends on full-config-boot; the registration
of LzmaCustomDecompressLib occurs unconditionally in the SecMain EFI
binary, triggered by the library constructor function.

This is where the bug happens. BaseExtractGuidedSectionLib maintains the
table of GUIDed decompressors (section handlers) at a fixed memory
location; selected by PcdGuidedExtractHandlerTableAddress (declared in
MdePkg.dec). The default value of this PCD is 0x1000000 (16 MB).

This causes SecMain to corrupt guest OS memory during S3, leading to
random crashes. Compare the following two memory dumps, the first taken
right before suspending, the second taken right after resuming a RHEL-7
guest:

crash> rd -8 -p 1000000 0x50
1000000: c0 00 08 00 02 00 00 00 00 00 00 00 00 00 00 00  ................
1000010: d0 33 0c 00 00 c9 ff ff c0 10 00 01 00 88 ff ff  .3..............
1000020: 0a 6d 57 32 0f 00 00 00 38 00 00 01 00 88 ff ff  .mW2....8.......
1000030: 00 00 00 00 00 00 00 00 73 69 67 6e 61 6c 6d 6f  ........signalmo
1000040: 64 75 6c 65 2e 73 6f 00 00 00 00 00 00 00 00 00  dule.so.........

vs.

crash> rd -8 -p 1000000 0x50
1000000: 45 47 53 49 01 00 00 00 20 00 00 01 00 00 00 00  EGSI.... .......
1000010: 20 01 00 01 00 00 00 00 a0 01 00 01 00 00 00 00   ...............
1000020: 98 58 4e ee 14 39 59 42 9d 6e dc 7b d7 94 03 cf  .XN..9YB.n.{....
1000030: 00 00 00 00 00 00 00 00 73 69 67 6e 61 6c 6d 6f  ........signalmo
1000040: 64 75 6c 65 2e 73 6f 00 00 00 00 00 00 00 00 00  dule.so.........

The "EGSI" signature corresponds to EXTRACT_HANDLER_INFO_SIGNATURE
declared in
MdePkg/Library/BaseExtractGuidedSectionLib/BaseExtractGuidedSectionLib.c.

Additionally, the gLzmaCustomDecompressGuid (quoted above) is visible at
guest-phys offset 0x1000020.

Fix the problem as follows:
- Carve out 4KB from the 36KB gap that we currently have between

  PcdOvmfLockBoxStorageBase + PcdOvmfLockBoxStorageSize == 8220 KB
  and
  PcdOvmfSecPeiTempRamBase                              == 8256 KB.

- Point PcdGuidedExtractHandlerTableAddress to 8220 KB (0x00807000).

- Cover the area with an EfiACPIMemoryNVS type memalloc HOB, if S3 is
  supported and we're not currently resuming.

The 4KB size that we pick is an upper estimate for
BaseExtractGuidedSectionLib's internal storage size. The latter is
calculated as follows (see GetExtractGuidedSectionHandlerInfo()):

  sizeof(EXTRACT_GUIDED_SECTION_HANDLER_INFO) +         // 32
  PcdMaximumGuidedExtractHandler * (
    sizeof(GUID) +                                      // 16
    sizeof(EXTRACT_GUIDED_SECTION_DECODE_HANDLER) +     //  8
    sizeof(EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER)     //  8
    )

OVMF sets PcdMaximumGuidedExtractHandler to 16 decimal (which is the
MdePkg default too), yielding 32 + 16 * (16 + 8 + 8) == 544 bytes.

Regarding the lifecycle of the new area:

(a) when and how it is initialized after first boot of the VM

  The library linked into SecMain finds that the area lacks the signature.
  It initializes the signature, plus the rest of the structure. This is
  independent of S3 support.

  Consumption of the area is also limited to SEC (but consumption does
  depend on full-config-boot).

(b) how it is protected from memory allocations during DXE

  It is not, in the general case; and we don't need to. Nothing else links
  against BaseExtractGuidedSectionLib; it's OK if DXE overwrites the area.

(c) how it is protected from the OS

  When S3 is enabled, we cover it with AcpiNVS in InitializeRamRegions().

  When S3 is not supported, the range is not protected.

(d) how it is accessed on the S3 resume path

  Examined by the library linked into SecMain. Registrations update the
  table in-place (based on GUID matches).

(e) how it is accessed on the warm reset path

  If S3 is enabled, then the OS won't damage the table (due to (c)), hence
  see (d).

  If S3 is unsupported, then the OS may or may not overwrite the
  signature. (It likely will.) This is identical to the pre-patch status.

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://svn.code.sf.net/p/edk2/code/trunk/edk2@15433 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 3 insertions, 0 deletions

diff --git a/OvmfPkg/OvmfPkgIa32.fdf b/OvmfPkg/OvmfPkgIa32.fdf
index 1f78b5bf92..76b868dde4 100644
--- a/OvmfPkg/OvmfPkgIa32.fdf
+++ b/OvmfPkg/OvmfPkgIa32.fdf
@@ -141,6 +141,9 @@ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase|gUefiOvmfPkgTokenSpaceGuid.P
 0x006000|0x001000

 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageSize

 

+0x007000|0x001000

+gEfiMdePkgTokenSpaceGuid.PcdGuidedExtractHandlerTableAddress|gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize

+

 0x010000|0x008000

 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize