[PATCH] D26312: Correct mprotect page boundries to round up end page. Fixes PR30905.

[Alina Sbirlea via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL286032: Correct mprotect page boundries to round up end page. Fixes PR30905. (authored by asbirlea).

Changed prior to commit:
  https://reviews.llvm.org/D26312?vs=76958&id=76962#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D26312

Files:
  llvm/trunk/lib/Support/Unix/Memory.inc


Index: llvm/trunk/lib/Support/Unix/Memory.inc
===================================================================
--- llvm/trunk/lib/Support/Unix/Memory.inc
+++ llvm/trunk/lib/Support/Unix/Memory.inc
@@ -153,7 +153,10 @@
 
   int Protect = getPosixProtectionFlags(Flags);
 
-  int Result = ::mprotect((void*)((uintptr_t)M.Address & ~(PageSize-1)), PageSize*((M.Size+PageSize-1)/PageSize), Protect);
+  uintptr_t Start = alignAddr((uint8_t *)M.Address - PageSize + 1, PageSize);
+  uintptr_t End = alignAddr((uint8_t *)M.Address + M.Size, PageSize);
+  int Result = ::mprotect((void *)Start, End - Start, Protect);
+
   if (Result != 0)
     return std::error_code(errno, std::generic_category());
 


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