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UefiCpuPkg/PiSmmCpu: Allow SMM access-out when static paging is OFF

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Commit c60d36b4d1ee1f69b7cca897d3621dfa951895c2
* UefiCpuPkg/SmmCpu: Block access-out only when static paging is used

updated page fault handler to treat SMM access-out as allowed
address when static paging is not used.

But that commit is not complete because the page table is still
updated in SetUefiMemMapAttributes() for non-SMRAM memory. When SMM
code accesses non-SMRAM memory, page fault is still generated.

This patch skips to update page table for non-SMRAM memory and
page table itself.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
This commit is contained in:
Ni, Ray 2019-07-18 14:58:07 +08:00 committed by Ray Ni
parent 520a1e60de
commit 30f6148546
1 changed files with 15 additions and 6 deletions
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21
UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c
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@ -1121,6 +1121,9 @@ FindSmramInfo (
*SmrrBase = (UINT32)CurrentSmramRange->CpuStart;
*SmrrSize = (UINT32)CurrentSmramRange->PhysicalSize;
//
// Extend *SmrrBase/*SmrrSize to include adjacent SMRAM ranges
//
do {
Found = FALSE;
for (Index = 0; Index < mSmmCpuSmramRangeCount; Index++) {
@ -1432,14 +1435,20 @@ PerformRemainingTasks (
SetMemMapAttributes ();
//
// For outside SMRAM, we only map SMM communication buffer or MMIO.
// Do not protect memory outside SMRAM when SMM static page table is not enabled.
//
SetUefiMemMapAttributes ();
if (mCpuSmmStaticPageTable) {
//
// Set page table itself to be read-only
//
SetPageTableAttributes ();
//
// For outside SMRAM, we only map SMM communication buffer or MMIO.
//
SetUefiMemMapAttributes ();
//
// Set page table itself to be read-only
//
SetPageTableAttributes ();
}
//
// Configure SMM Code Access Check feature if available.