From: Yao, Jiewen <jiewen.yao@intel.com>
Date: Thu, 26 Nov 2015 07:01:08 +0000 (+0000)
Subject: Always set WP in CR0.
X-Git-Tag: edk2-stable201903~8502
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=8e496a7abcb78c36b0af47ed473096ef7f171606

Always set WP in CR0.

Always set RW+P bit for page table by default.

So that we can use write-protection for code later.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Kinney, Michael D" <michael.d.kinney@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18960 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.S b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.S
index fbaa0725f0..ec5b9a0b04 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.S
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.S
@@ -123,7 +123,7 @@ L11:
 L12:                                       # as cr4.PGE is not set here, refresh cr3
     movl    %eax, %cr4                     # in PreModifyMtrrs() to flush TLB.
     movl    %cr0, %ebx
-    orl     $0x080000000, %ebx             # enable paging
+    orl     $0x080010000, %ebx             # enable paging + WP
     movl    %ebx, %cr0
     leal    DSC_OFFSET(%edi),%ebx
     movw    DSC_DS(%ebx),%ax
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
index 8a12927300..ac1a9b48dd 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
@@ -129,7 +129,7 @@ gSmiCr3     DD      ?
 @@:                                     ; as cr4.PGE is not set here, refresh cr3
     mov     cr4, eax                    ; in PreModifyMtrrs() to flush TLB.
     mov     ebx, cr0
-    or      ebx, 080000000h             ; enable paging
+    or      ebx, 080010000h             ; enable paging + WP
     mov     cr0, ebx
     lea     ebx, [edi + DSC_OFFSET]
     mov     ax, [ebx + DSC_DS]
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
index 06ffc6dd86..99d03c4b85 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
@@ -785,7 +785,7 @@ Gen4GPageTable (
   // Set Page Directory Pointers
   //
   for (Index = 0; Index < 4; Index++) {
-    Pte[Index] = (UINTN)PageTable + EFI_PAGE_SIZE * (Index + 1) + IA32_PG_P;
+    Pte[Index] = (UINTN)PageTable + EFI_PAGE_SIZE * (Index + 1) + PAGE_ATTRIBUTE_BITS;
   }
   Pte += EFI_PAGE_SIZE / sizeof (*Pte);
 
@@ -793,7 +793,7 @@ Gen4GPageTable (
   // Fill in Page Directory Entries
   //
   for (Index = 0; Index < EFI_PAGE_SIZE * 4 / sizeof (*Pte); Index++) {
-    Pte[Index] = (Index << 21) + IA32_PG_PS + IA32_PG_RW + IA32_PG_P;
+    Pte[Index] = (Index << 21) | IA32_PG_PS | PAGE_ATTRIBUTE_BITS;
   }
 
   if (FeaturePcdGet (PcdCpuSmmStackGuard)) {
@@ -802,7 +802,7 @@ Gen4GPageTable (
     Pdpte = (UINT64*)PageTable;
     for (PageIndex = Low2MBoundary; PageIndex <= High2MBoundary; PageIndex += SIZE_2MB) {
       Pte = (UINT64*)(UINTN)(Pdpte[BitFieldRead32 ((UINT32)PageIndex, 30, 31)] & ~(EFI_PAGE_SIZE - 1));
-      Pte[BitFieldRead32 ((UINT32)PageIndex, 21, 29)] = (UINT64)Pages + IA32_PG_RW + IA32_PG_P;
+      Pte[BitFieldRead32 ((UINT32)PageIndex, 21, 29)] = (UINT64)Pages | PAGE_ATTRIBUTE_BITS;
       //
       // Fill in Page Table Entries
       //
@@ -819,7 +819,7 @@ Gen4GPageTable (
             GuardPage = 0;
           }
         } else {
-          Pte[Index] = PageAddress + IA32_PG_RW + IA32_PG_P;
+          Pte[Index] = PageAddress | PAGE_ATTRIBUTE_BITS;
         }
         PageAddress+= EFI_PAGE_SIZE;
       }
@@ -886,7 +886,7 @@ SetCacheability (
       NewPageTable[Index] |= (UINT64)(Index << EFI_PAGE_SHIFT);
     }
 
-    PageTable[PTIndex] = ((UINTN)NewPageTableAddress & gPhyMask) | IA32_PG_P;
+    PageTable[PTIndex] = ((UINTN)NewPageTableAddress & gPhyMask) | PAGE_ATTRIBUTE_BITS;
   }
 
   ASSERT (PageTable[PTIndex] & IA32_PG_P);
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
index f2a91655a3..133165db13 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
@@ -71,15 +71,19 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 ///
 #define IA32_PG_P                   BIT0
 #define IA32_PG_RW                  BIT1
+#define IA32_PG_U                   BIT2
 #define IA32_PG_WT                  BIT3
 #define IA32_PG_CD                  BIT4
 #define IA32_PG_A                   BIT5
+#define IA32_PG_D                   BIT6
 #define IA32_PG_PS                  BIT7
 #define IA32_PG_PAT_2M              BIT12
 #define IA32_PG_PAT_4K              IA32_PG_PS
 #define IA32_PG_PMNT                BIT62
 #define IA32_PG_NX                  BIT63
 
+#define PAGE_ATTRIBUTE_BITS         (IA32_PG_RW | IA32_PG_P)
+
 //
 // Size of Task-State Segment defined in IA32 Manual
 //
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c
index ff4e28ec58..ec4ec9b067 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c
@@ -557,9 +557,9 @@ InitPaging (
 
           // Split it
           for (Level4 = 0; Level4 < SIZE_4KB / sizeof(*Pt); Level4++) {
-            Pt[Level4] = Address + ((Level4 << 12) | IA32_PG_RW | IA32_PG_P);
+            Pt[Level4] = Address + ((Level4 << 12) | PAGE_ATTRIBUTE_BITS);
           } // end for PT
-          *Pte = (UINTN)Pt | IA32_PG_RW | IA32_PG_P;
+          *Pte = (UINTN)Pt | PAGE_ATTRIBUTE_BITS;
         } // end if IsAddressSplit
       } // end for PTE
     } // end for PDE
@@ -608,7 +608,7 @@ InitPaging (
             //
             // Patch to remove Present flag and RW flag
             //
-            *Pte = *Pte & (INTN)(INT32)(~(IA32_PG_RW | IA32_PG_P));
+            *Pte = *Pte & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);
           }
           if (Nx && mXdSupported) {
             *Pte = *Pte | IA32_PG_NX;
@@ -621,7 +621,7 @@ InitPaging (
           }
           for (Level4 = 0; Level4 < SIZE_4KB / sizeof(*Pt); Level4++, Pt++) {
             if (!IsAddressValid (Address, &Nx)) {
-              *Pt = *Pt & (INTN)(INT32)(~(IA32_PG_RW | IA32_PG_P));
+              *Pt = *Pt & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);
             }
             if (Nx && mXdSupported) {
               *Pt = *Pt | IA32_PG_NX;
@@ -1244,7 +1244,7 @@ RestorePageTableBelow4G (
     //
     PageTable[PTIndex] = (PFAddress & ~((1ull << 21) - 1));
     PageTable[PTIndex] |= (UINT64)IA32_PG_PS;
-    PageTable[PTIndex] |= (UINT64)(IA32_PG_RW | IA32_PG_P);
+    PageTable[PTIndex] |= (UINT64)PAGE_ATTRIBUTE_BITS;
     if ((ErrorCode & IA32_PF_EC_ID) != 0) {
       PageTable[PTIndex] &= ~IA32_PG_NX;
     }
@@ -1277,7 +1277,7 @@ RestorePageTableBelow4G (
     // Set new entry
     //
     PageTable[PTIndex] = (PFAddress & ~((1ull << 12) - 1));
-    PageTable[PTIndex] |= (UINT64)(IA32_PG_RW | IA32_PG_P);
+    PageTable[PTIndex] |= (UINT64)PAGE_ATTRIBUTE_BITS;
     if ((ErrorCode & IA32_PF_EC_ID) != 0) {
       PageTable[PTIndex] &= ~IA32_PG_NX;
     }
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
index a7d790fd8a..d242e06a5e 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/PageTbl.c
@@ -127,7 +127,7 @@ SmmInitPageTable (
   // Fill Page-Table-Level4 (PML4) entry
   //
   PTEntry = (UINT64*)(UINTN)(Pages - EFI_PAGES_TO_SIZE (PAGE_TABLE_PAGES + 1));
-  *PTEntry = Pages + IA32_PG_P;
+  *PTEntry = Pages + PAGE_ATTRIBUTE_BITS;
   ZeroMem (PTEntry + 1, EFI_PAGE_SIZE - sizeof (*PTEntry));
   //
   // Set sub-entries number
@@ -591,7 +591,7 @@ SmiDefaultPFHandler (
         //
         // If the entry is not present, allocate one page from page pool for it
         //
-        PageTable[PTIndex] = AllocPage () | IA32_PG_RW | IA32_PG_P;
+        PageTable[PTIndex] = AllocPage () | PAGE_ATTRIBUTE_BITS;
       } else {
         //
         // Save the upper entry address
@@ -621,7 +621,7 @@ SmiDefaultPFHandler (
     // Fill the new entry
     //
     PageTable[PTIndex] = (PFAddress & gPhyMask & ~((1ull << EndBit) - 1)) |
-                         PageAttribute | IA32_PG_A | IA32_PG_RW | IA32_PG_P;
+                         PageAttribute | IA32_PG_A | PAGE_ATTRIBUTE_BITS;
     if (UpperEntry != NULL) {
       SetSubEntriesNum (UpperEntry, GetSubEntriesNum (UpperEntry) + 1);
     }
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.S b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.S
index b488b74b70..7e9ac58cb2 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.S
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.S
@@ -144,7 +144,7 @@ Base:
     orb     $1,%ah
     wrmsr
     movq    %cr0, %rbx
-    btsl    $31, %ebx
+    orl     $0x080010000, %ebx          # enable paging + WP
     movq    %rbx, %cr0
     retf
 LongMode:                               # long mode (64-bit code) starts here
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
index 4f5c03c5cf..094cf2c3da 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
@@ -140,7 +140,7 @@ Base:
     or      ah, 1
     wrmsr
     mov     rbx, cr0
-    bts     ebx, 31
+    or      ebx, 080010000h            ; enable paging + WP
     mov     cr0, rbx
     retf
 @LongMode:                              ; long mode (64-bit code) starts here
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmProfileArch.c b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmProfileArch.c
index c4ec12debb..b3cd629f55 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmProfileArch.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmProfileArch.c
@@ -51,7 +51,7 @@ InitSmmS3Cr3 (
   // Fill Page-Table-Level4 (PML4) entry
   //
   PTEntry = (UINT64*)(UINTN)(Pages - EFI_PAGES_TO_SIZE (1));
-  *PTEntry = Pages + IA32_PG_P;
+  *PTEntry = Pages | PAGE_ATTRIBUTE_BITS;
   ZeroMem (PTEntry + 1, EFI_PAGE_SIZE - sizeof (*PTEntry));
 
   //
@@ -117,7 +117,7 @@ AcquirePage (
   //
   // Link & Record the current uplink
   //
-  *Uplink = Address | IA32_PG_P | IA32_PG_RW;
+  *Uplink = Address | PAGE_ATTRIBUTE_BITS;
   mPFPageUplink[mPFPageIndex] = Uplink;
 
   mPFPageIndex = (mPFPageIndex + 1) % MAX_PF_PAGE_COUNT;
@@ -242,9 +242,9 @@ RestorePageTableAbove4G (
       // PTE
       PageTable = (UINT64*)(UINTN)(PageTable[PTIndex] & PHYSICAL_ADDRESS_MASK);
       for (Index = 0; Index < 512; Index++) {
-        PageTable[Index] = Address | IA32_PG_RW | IA32_PG_P;
+        PageTable[Index] = Address | PAGE_ATTRIBUTE_BITS;
         if (!IsAddressValid (Address, &Nx)) {
-          PageTable[Index] = PageTable[Index] & (INTN)(INT32)(~(IA32_PG_RW | IA32_PG_P));
+          PageTable[Index] = PageTable[Index] & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);
         }
         if (Nx && mXdSupported) {
           PageTable[Index] = PageTable[Index] | IA32_PG_NX;
@@ -262,7 +262,7 @@ RestorePageTableAbove4G (
         //
         // Patch to remove present flag and rw flag.
         //
-        PageTable[PTIndex] = PageTable[PTIndex] & (INTN)(INT32)(~(IA32_PG_RW | IA32_PG_P));
+        PageTable[PTIndex] = PageTable[PTIndex] & (INTN)(INT32)(~PAGE_ATTRIBUTE_BITS);
       }
       //
       // Set XD bit to 1
@@ -289,7 +289,7 @@ RestorePageTableAbove4G (
   //
   // Add present flag or clear XD flag to make page fault handler succeed.
   //
-  PageTable[PTIndex] |= (UINT64)(IA32_PG_RW | IA32_PG_P);
+  PageTable[PTIndex] |= (UINT64)(PAGE_ATTRIBUTE_BITS);
   if ((ErrorCode & IA32_PF_EC_ID) != 0) {
     //
     // If page fault is caused by instruction fetch, clear XD bit in the entry.