Zebediah Figura : ntoskrnl.exe: Protect the two relocated pages independently.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: 02d156580efef9035baac2b702ce999759329248
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=02d156580efef9035baac2b702ce999759329248

Author: Zebediah Figura <z.figura12 at gmail.com>
Date:   Fri May 22 09:52:56 2020 -0500

ntoskrnl.exe: Protect the two relocated pages independently.

They may have different protection flags.

This fixes a regression introduced by 22dfb0df10b44d1c21b3d04b59312670c2318431.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=49198
Signed-off-by: Zebediah Figura <z.figura12 at gmail.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
(cherry picked from commit c750ae6b9dc85fd2173e40a07204388988b64532)
Signed-off-by: Michael Stefaniuc <mstefani at winehq.org>

---

 dlls/ntoskrnl.exe/ntoskrnl.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index f6b27d8c2f..25ace4f1a3 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -3412,8 +3412,8 @@ static NTSTATUS perform_relocations( void *module, SIZE_T len, ULONG page_size )
 
     while (rel < end - 1 && rel->SizeOfBlock)
     {
-        void *page = get_rva( module, rel->VirtualAddress );
-        DWORD old_prot;
+        char *page = get_rva( module, rel->VirtualAddress );
+        DWORD old_prot1, old_prot2;
 
         if (rel->VirtualAddress >= len)
         {
@@ -3423,10 +3423,12 @@ static NTSTATUS perform_relocations( void *module, SIZE_T len, ULONG page_size )
 
         /* Relocation entries may hang over the end of the page, so we need to
          * protect two pages. */
-        VirtualProtect( page, page_size * 2, PAGE_READWRITE, &old_prot );
+        VirtualProtect( page, page_size, PAGE_READWRITE, &old_prot1 );
+        VirtualProtect( page + page_size, page_size, PAGE_READWRITE, &old_prot2 );
         rel = LdrProcessRelocationBlock( page, (rel->SizeOfBlock - sizeof(*rel)) / sizeof(USHORT),
                                          (USHORT *)(rel + 1), delta );
-        VirtualProtect( page, page_size * 2, old_prot, &old_prot );
+        VirtualProtect( page, page_size, old_prot1, &old_prot1 );
+        VirtualProtect( page + page_size, page_size, old_prot2, &old_prot2 );
         if (!rel) return STATUS_INVALID_IMAGE_FORMAT;
     }