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Correct mprotect page boundries to round up end page. Fixes PR30905.

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Summary:
Update the boundries for mprotect.
Patch by Andrew Adams. Fixes PR30905.

Reviewers: loladiro, andrew.w.kaylor, chandlerc

Subscribers: abadams, llvm-commits

Differential Revision: https://reviews.llvm.org/D26312

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286032 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alina Sbirlea 2016-11-05 04:22:15 +00:00
parent cf48862cf8
commit 1aa9c9ac56
1 changed files with 4 additions and 1 deletions
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5
lib/Support/Unix/Memory.inc
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@ -153,7 +153,10 @@ Memory::protectMappedMemory(const MemoryBlock &M, unsigned Flags) {
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());